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  <title>PCB抄板PCB设计专家分析抄板公司发展及IC芯片解密趋势</title>
  <link>http://blog.tom.com/pcbcblab</link>
  <description><![CDATA[抄板、PCB抄板、PCB设计、芯片解密、样机调试、样机制作、SMT加工——龙芯世纪 ]]></description>
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		<title><![CDATA[ 芯片解密和软件破解常见问答——龙人IC解密中心 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/705.html</link>
		<description><![CDATA[ <div style="LAYOUT-GRID: 15.6pt none">
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">芯片解密和软件破解常见问答——龙人IC解密中心</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以下是龙人计算机</font><span><a href="http://www.icinf.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">IC<font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">研究中心的芯片解密专家、</font></span><span><a href="http://icjiemi.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">IC<font face="宋体">解密专家</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、单片机解密专家和软件破解专家整理的关于软件破解的常见问题及回答。</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">Q:<font face="宋体">哪些人可以学习</font><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">软件</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">破解？&nbsp;</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">A:<font face="宋体">任何会启动电脑并运行软件同时又想学习</font><span><a href="http://www.lrpcb.cn/xinpian.asp"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">软件</font></span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">破解</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">的人。我说的全是实话，如果你既不会启动电脑又不会运行软件，那么我教你一个更高深的吧--破解电脑，呵呵，很简单，到大街上随便抡个板砖什么的，回去慢慢破解吧&nbsp;(记得关电源)&nbsp;</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">Q:<font face="宋体">有没有什么办法可以使我快速入门</font><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">软件破解和</font></span><span><a href="http://www.dmpcb.cn/services/IC/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">，</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">并成为高手？&nbsp;</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">A:<font face="宋体">有。但你得是个MM(P不PL无所谓)，然后找个离你家最近的破解达人，什么也不用做，眨个眼放个电之类的会吧（现在连初中的小女生都会这个），然后就成了，呵呵，想破什么的话，让高手帮忙吧，到时说成是自己破的就成了&nbsp;MM问为什么？因为那些高手大都奇丑无比，呵呵，有了头脑就没了长相，男的也是这样，而且越是高手，长的就是越丑。据说一次市里到CCG考察奶牛们的出乳情况，看到大哥Sun某的时候，说了句“这奶牛个儿这么小啊，中午大家吃涮锅”&nbsp;(众大哥:大家准备好家伙，我们一会儿要去械斗)。呵呵，玩笑开到这里，其实我说这么多，只是想告诉你，学习</font><span><a href="http://www.pcbinf.com/xpjm.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">加密狗</font></span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">破解</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">跟其它技术一样，请你不要试图投机取巧，要想学，就脚踏实地，多看教程多动手实践积累经验，不要经常POSE那种弱智问题“我不懂XX，请问我能学破解吗？”，答案是不能，你问的同时，不也正在学吗？想知道重要吗？那我告诉你好了，凡是看雪教程上要求掌握的，你全要掌握，这还不算，要想成为高手就必须精通，如果你不想一直只停留在入门阶段的话。不要想偷机取巧，谁一开始也不是什么都会的，但你只要花一些时间和一小部分精力，那么没有什么你学不会的，知识是要积累的，你知道自己不会却不去学，而在那儿问重不重要，人家会觉的你这个人并不想认真学破解，而是报有侥幸心理在浪费时间，请不要做浪费时间的人。不要刚开始学就想马上成为高手，没有高手，你没必要立下超越的目标，只把学知识放在首位就够了，欲速则不达，请不要做急于求成的人。</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">芯片解密&nbsp;软件破解&nbsp;IC解密&nbsp;单片机解密&nbsp;加密狗破解</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">Q:<font face="宋体">学</font><span><a href="http://www.pcb-ic.com/IC/index.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">软件</font></span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">破解</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">对我来说有什么好处？&nbsp;</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">A:<font face="宋体">这个问题应该你自己来回答，呵呵，你为什么要学？“我想免费使用共享软件”倒...那多少也算是个目的，但我希望你不要只报这种目的(目前国内共享软件业还有待发展)。我只是想说给那些只是因为一时冲动才学习破解的人，请将你们当初的冲动继续维持下去，你需要明白，学习破解的目的不只在于破解软件这个词，也许后来你会变为软件分析，随着学习时间的增加，对你的编程水平，相信会有相当大的提高。学习别人好的思想，并化为已用&nbsp;就我个人来说，学习破解可以把我的汇编的基础给打好，呵呵，俺对操作系统这玩意儿感兴趣，到时候还想写出来个玩玩儿呢，所以汇编这关必须要过....&nbsp;</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">Q:<font face="宋体">我很笨，那些大虾的教程我大都看不明白，我能学会吗？&nbsp;</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">A:<font face="宋体">永远不要说你笨，你只是学的比人家晚而已，太高深的看不懂，那你就捡能看懂的看，别人能入门，你也能，不得要领只是暂时，大虾与你，也许差的就是一两年时间的问题。&nbsp;</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">深圳</font><span><a href="http://mcuiclr.web.17jzw.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">单片机芯片解密专家</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙人计算机提供合法用途的</font></span><span><a href="http://mcuiclr.blog.china.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">单片机解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、芯片解密和IC解密加密业务包括MCU解密工具、单片机芯片解密软件、单片机解密设备、单片机解密仪器、IC解密方法和芯片解密方案等。详情见：</font></span><span><a href="http://www.pcbinf.com/xpjm.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcbinf.com/xpjm.html</span></a></span></p>
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		<eb:creationDate>2008-05-16 18:38:48</eb:creationDate>
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		<title><![CDATA[ 用PCB设计软件PROTEL99制作印刷电路板的基本流程 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/704.html</link>
		<description><![CDATA[ <div style="LAYOUT-GRID: 15.6pt none">
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">用</font><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计软件</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PROTEL99<font face="宋体">制作印刷电路</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">的基本流程</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以下是</font><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">用PROTEL99制作印刷电路</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">的基本流程</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">，</font></span><span><a href="http://pcbchaoban.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板流程</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">是PCB设计的逆向过程，也是使用</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PROTEL99</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">软件。深圳</font></span><span><a href="http://www.pcbinf.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙人计算机</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">作为抄板、</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">、PCB改板、PCB</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">、</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB&nbsp;Layout<font face="宋体">、</font></span><span><a href="http://www.icinf.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、单片机解密、软件破解、</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">样机调试、BOM</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">清</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">单、PCB</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">成品加工一条龙服务型企业</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,<font face="宋体">是深圳最专业的抄板公司.</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">一、电路</font><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">设计的先期工作</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　1、利用原理图设计工具绘制原理图，并且生成对应的网络表。当然，有些特殊情况下，如电路</font><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">比较简单，已经有了网络表等情况下也可以不进行原理图的设计，直接进入PCB设计系统，在PCB设计系统中，可以直接取用零件封装，人工生成网络表。</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">2<font face="宋体">、手工更改网络表&nbsp;将一些元件的固定用脚等原理图上没有的焊盘定义到与它相通的网络上，没任何物理连接的可定义到地或保护地等。将一些原理图和PCB封装库中引脚名称不一致的器件引脚名称改成和PCB封装库中的一致，特别是二、三极管等。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">二、画出自己定义的非标准器件的封装库</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　建议将自己所画的器件都放入一个自己建立的PCB&nbsp;库专用设计文件。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">三、设置</font><span><a href="http://www.pcbsj.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">环境和绘制印刷电路的版框含中间的镂空等</font></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　1、进入PCB系统后的第一步就是设置PCB设计环境，包括设置格点大小和类型，光标类型，版层参数，布线参数等等。大多数参数都可以用系统默认值，而且这些参数经过设置之后，符合个人的习惯，以后无须再去修改。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　2、规划电路版，主要是确定电路版的边框，包括电路版的尺寸大小等等。在需要放置固定孔的地方放上适当大小的焊盘。对于3mm&nbsp;的螺丝可用6.5~8mm&nbsp;的外径和3.2~3.5mm&nbsp;内径的焊盘对于标准板可从其它板或PCB&nbsp;izard&nbsp;中调入。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　注意：在绘制电路版地边框前，一定要将当前层设置成Keep&nbsp;Out层，即禁止布线层。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">四、打开所有要用到的PCB&nbsp;库文件后，调入网络表文件和修改零件封装</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　这一步是非常重要的一个环节，网络表是PCB自动布线的灵魂，也是原理图设计与印象电路版设计的接口，只有将网络表装入后，才能进行电路版的布线。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">在原理图设计的过程中，ERC检查不会涉及到零件的封装问题。因此，原理图设计时，零件的封装可能被遗忘，在引进网络表时可以根据设计情况来修改或补充零件的封装。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">当然，可以直接在PCB内人工生成网络表，并且指定零件封装。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">五、布置零件封装的位置，也称零件布局</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">七、布线规则设置</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　在不希望有走线的区域内放置FILL&nbsp;填充层，如散热器和卧放的两脚晶振下方所在布线层，要上锡的在Top&nbsp;或Bottom&nbsp;Solder&nbsp;相应处放FILL。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">布线规则设置也是印刷电路版设计的关键之一，需要丰富的实践经验。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">八、自动布线和手工调整</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">九、切换到单层显示模式下（点击菜单命令Tools/Preferences，选中对话框中Display栏的Single&nbsp;Layer&nbsp;Mode）</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　将每个布线层的线拉整齐和美观。手工调整时应经常做DRC，因为有时候有些线会断开而你可能会从它断开处中间走上好几根线，快完成时可将每个布线层单独打印出来，以方便改线时参考，其间也要经常用3D显示和密度图功能查看。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　最后取消单层显示模式，存盘。</font></p>
<p href="http://www.pcblab.net/PCB/SheJi/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;</span><span><a href="http://www.lrpcb.cn/chaoban.asp"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">抄板&nbsp;</font></span><span><a href="http://icjiemi.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">IC<font face="宋体">解密</font></span></a></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十、如果器件需要重新标注可点击菜单命令Tools/Re-Annotate&nbsp;并选择好方向后，按OK钮。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　并回原理图中选Tools-Back&nbsp;Annotate&nbsp;并选择好新生成的那个*.WAS&nbsp;文件后，按OK&nbsp;钮。原理图中有些标号应重新拖放以求美观，全部调完并DRC&nbsp;通过后，拖放所有丝印层的字符到合适位置。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　注意字符尽量不要放在元件下面或过孔焊盘上面。对于过大的字符可适当缩小，DrillDrawing&nbsp;层可按需放上一些坐标（Place-Coordinate）和尺寸（（Place-Dimension）。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　最后再放上印板名称、设计版本号、公司名称、文件首次加工日期、印板文件名、文件加工编号等信息（请参见第五步图中所示）。并可用第三方提供的程序来加上图形和中文注释如BMP2PCB.EXE&nbsp;和宏势公司ROTEL99&nbsp;和PROTEL99SE&nbsp;专用PCB&nbsp;汉字输入程序包中的FONT.EXE&nbsp;等。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十一、对所有过孔和焊盘补泪滴</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　补泪滴可增加它们的牢度，但会使板上的线变得较难看。顺序按下键盘的S&nbsp;和A&nbsp;键（全选），再选择Tools-Teardrops，选中General&nbsp;栏的前三个，并选Add&nbsp;和Track&nbsp;模式，如果你不需要把最终文件转为PROTEL&nbsp;的DOS&nbsp;版格式文件的话也可用其它模式，后按OK&nbsp;钮。完成后顺序按下键盘的X&nbsp;和A&nbsp;键（全部不选中）。对于贴片和单面板一定要加。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十二、放置覆铜区</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十三、最后再做一次DRC</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十五、发Email&nbsp;或拷盘给加工厂家，注明板材料和厚度（做一般板子时，厚度为1.6mm，特大型板可用2mm，射频用微带板等一般在0.8-1mm&nbsp;左右，并应该给出板子的介电常数等指标）、数量、加工时需特别注意之处等。Email发出后两小时内打电话给厂家确认收到与否。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十六、产生BOM&nbsp;文件并导出后编辑成符合公司内部规定的格式。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">十七、将边框螺丝孔接插件等与机箱机械加工有关的部分（即先把其它不相关的部分选中后删除），导出为公制尺寸的AutoCAD&nbsp;R14&nbsp;的DWG&nbsp;格式文件给机械设计人员。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">二十一、整理和打印各种文档。如元器件清单、器件装配图（并应注上打印比例）、安装和接线说明等。</font></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">更多关于PCB设计的技术资料请进龙人网站：</font><span><a href="http://www.pcbinf.com/sheji.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcbinf.com/sheji.html</span></a></span></p>
<p style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">设计和</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB&nbsp;layout-</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙人</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">设计部：</font></span><span><a href="http://www.pcb-ic.com/PCBsj/index.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcb-ic.com/PCBsj/index.html</span></a></span></p>
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		<title><![CDATA[ ARM9 S3C2410开发板的PCB设计指南－龙人ARM开发板 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/639.html</link>
		<description><![CDATA[ <p style="MARGIN: 0cm 0cm 0pt"><span style="COLOR: red; mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM9 S3C2410</font></span><span style="COLOR: red; FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板的</span><span style="COLOR: red; mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="COLOR: red; FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计指南－龙人</span><span style="COLOR: red; mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM</font></span><span style="COLOR: red; FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="COLOR: red; FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">文章来源：</span><span style="COLOR: red; mso-ansi-language: ZH-CN"><a href="http://www.armodm.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">龙人计算机</span></a></span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">本文是一篇说明</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM9 S3C2410</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">系统</span><span style="mso-ansi-language: ZH-CN"><a href="http://pcblab.blog.ccidnet.com/"><font face="Times New Roman">PCB</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计</span></a></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">注意事项的文章，简短实用，希望对你有帮助。</span></p>
<p style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 0cm; mso-list: l0 level1 lfo1"><span lang="EN-US" style="mso-fareast-font-family: 'Times New Roman'"><span style="mso-list: Ignore"><font face="Times New Roman">1.</font></span></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在进行</span><span style="mso-ansi-language: ZH-CN"><a href="http://arm9arm7.xinwen520.net/"><font face="Times New Roman">ARM9 S3C2410</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计时</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">要有合理的走向：如输入</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">输出，交流</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">直流，强</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">弱信号，高频</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">低频，高压</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">低压等</span><span lang="EN-US"><font face="Times New Roman">...</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，它们的走向应该是呈线形的</span><span lang="EN-US"><font face="Times New Roman">(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或分离</span><span lang="EN-US"><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，不得相互交融。其目的是防止相互干扰。最好的走向是按直线，但一般不易实现，最不利的走向是环形，所幸的是可以设隔离带来改善。对于是直流，小信号，低电压</span><span lang="EN-US"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计的要求可以低些。所以</span><span lang="EN-US"><font face="Times New Roman">“</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">合理</span><span lang="EN-US"><font face="Times New Roman">”</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是相对的。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="COLOR: red; mso-ansi-language: ZH-CN"><a href="http://arm9arm7.blog.nnsky.com/"><font face="Times New Roman">ARM9</font></a> <font face="Times New Roman">S3C2410</font></span><span style="COLOR: red; FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span> <span style="COLOR: red; mso-ansi-language: ZH-CN"><a href="http://arm9arm7.blog.163.com/"><font face="Times New Roman">ARM9</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a> <a href="http://arm9arm7.blog.bokee.net/"><font face="Times New Roman">ARM</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a> <font face="Times New Roman">PCB</font></span><span style="COLOR: red; FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">2.</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在进行</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM9</font> <a href="http://armodm.xinwen520.net/"><font face="Times New Roman">S3C2410</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计时</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">选择好接地点：小小的接地点不知有多少工程技术人员对它做过多少论述，足见其重要性。一般情况下要求共点地，如：前向放大器的多条地线应汇合后再与干线地相连等等</span><span lang="EN-US"><font face="Times New Roman">...</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。现实中，因受各种限制很难完全办到，但应尽力遵循。这个问题在实际中是相当灵活的。每个人都有自己的一套解决方案。如能针对具体的电路板来解释就容易理解。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">3.</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在进行</span><span style="mso-ansi-language: ZH-CN"><a href="http://arm9arm7.blog.china.alibaba.com/"><font face="Times New Roman">ARM9</font></a> <font face="Times New Roman">S3C2410</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计时</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">合理布置电源滤波</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦电容：一般在原理图中仅画出若干电源滤波</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦电容，但未指出它们各自应接于何处。其实这些电容是为开关器件</span><span lang="EN-US"><font face="Times New Roman">(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">门电路</span><span lang="EN-US"><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或其它需要滤波</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦的部件而设置的，布置这些电容就应尽量靠近这些元部件，离得太远就没有作用了。有趣的是，当电源滤波</span><span lang="EN-US"><font face="Times New Roman">/</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">退耦电容布置的合理时，接地点的问题就显得不那么明显。</span><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;</font></span></span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">4.</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在进行</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM9 S3C2410</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开</span><span style="mso-ansi-language: ZH-CN"><a href="http://blog.tom.com/arm9arm7"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">发板的</span></a><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计时</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">线条有讲究：有条件做宽的线决不做细；高压及高频线应园滑，不得有尖锐的倒角，拐弯也不得采用直角。地线应尽量宽，最好使用大面积敷铜，这对接地点问题有相当大的改善。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">5.</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在进行</span><span style="mso-ansi-language: ZH-CN"><a href="http://arm9arm7.pcclub.pconline.com.cn/"><font face="Times New Roman">ARM9</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计时</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">有些问题虽然发生在后期制作中，但却是</span><span lang="EN-US"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计中带来的，它们是：</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;&nbsp;&nbsp;</font></span></span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">过线孔太多，沉铜工艺稍有不慎就会埋下隐患。所以，设计中应尽量减少过线孔。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;&nbsp;&nbsp;</font></span></span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">同向并行的线条密度太大，焊接时很容易连成一片。所以，线密度应视焊接工艺的水平来确定。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;&nbsp;&nbsp;</font></span></span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">焊点的距离太小，不利于人工焊接，只能以降低工效来解决焊接质量。否则将留下隐患。所以，焊点的最小距离的确定应综合考虑焊接人员的素质和工效。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;&nbsp;&nbsp;</font></span></span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">焊盘或过线孔尺寸太小，或焊盘尺寸与钻孔尺寸配合不当。前者对人工钻孔不利，后者对数控钻孔不利。容易将焊盘钻成</span><span lang="EN-US"><font face="Times New Roman">“c”</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">形，重则钻掉焊盘。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;&nbsp;&nbsp;</font></span></span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">导线太细，而大面积的未布线区又没有设置敷铜，容易造成腐蚀不均匀。即当未布线区腐蚀完后，细导线很有可能腐蚀过头，或似断非断，或完全断。所以，设置敷铜的作用不仅仅是增大地线面积和抗干扰。</span><span lang="EN-US"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;</font></span></span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">&nbsp;</font></span></p>
<p style="MARGIN: 5pt 0cm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">龙人就算机从事</span><span lang="EN-US"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">行业多年，拥有丰富抄板和</span><span lang="EN-US"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计经验，</span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">深圳龙人计算机有限公司拥有</span><span style="mso-ansi-language: ZH-CN"><a href="http://www.armodm.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌入式产品事业部</span></a></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计工作室，反向技术研究所和</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">SMT</font></span><span style="FONT-FAMILY: 宋体; mso-ansi-language: ZH-CN; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">加工厂等。嵌入式产品事业部</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在为公司提供嵌入式</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解决方案和</span><span lang="EN-US"><font face="Times New Roman">OEM/ODM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">研发服务的同时提供</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span><span lang="EN-US"><font face="Times New Roman">(</font><a href="http://arm9arm7.blog.bokee.net/"><font face="Times New Roman">ARM9</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">开发板和</span></span><font face="Times New Roman">ARM7</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">开发板</span></span></a><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><span lang="EN-US"><a href="http://arm9arm7.blog.ccidnet.com/"><font face="Times New Roman">ARM9</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">核心板</span></span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><span lang="EN-US"><font face="Times New Roman">ARM9</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">学习板、</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">工控板及</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">教学实验系统等嵌入式产品。网址：</span><span lang="EN-US"><a href="http://www.armodm.com/"><font face="Times New Roman">http://www.armodm.com</font></a></span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span lang="EN-US"><font face="Times New Roman">&nbsp;</font></span></p> ]]></description>
		<eb:creationDate>2008-03-20 12:01:56</eb:creationDate>
		<eb:modificationDate></eb:modificationDate>
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		<title><![CDATA[ 嵌入式开关电源的PCB设计——龙人嵌入式系统开发 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/638.html</link>
		<description><![CDATA[ <p style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">嵌入式开关电源的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">——</font><a href="http://www.armodm.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">龙人</span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">嵌入式系统开发</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">在任何开关电源的</span><span style="mso-ansi-language: ZH-CN"><a href="http://pcblab.xinwen520.net/"><font face="Times New Roman">PCB</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">设计</span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">中，</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">板的物理设计都是最后一个环节，如果设计方法不当，</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">可能会辐射过多的电磁干扰，造成电源工作不稳定。作为</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计者，必须理解电路的物理工作原理，设计出高质量的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="mso-ansi-language: ZH-CN"><a href="http://embed123.xinwen520.net/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌入式</span></a> <font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计</span> <span style="mso-ansi-language: ZH-CN"><a href="http://armodmlr.bokee.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开关电源</span></a> <a href="http://www.armodm.com/"><font face="Times New Roman">ARM</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a> <a href="http://armodm.zhan.cn.yahoo.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌入式开发</span></a></span></p>
<p style="MARGIN: 5pt 0cm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">嵌入式开关电源中包含有高频信号，</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font><a href="http://pcbcblab.blog.dianyuan.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">印刷电路板</span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">上任何印制线都可以起到天线的作用，印制线的长度和宽度会影响其阻抗和感抗，从而影响频率响应。即使是通过直流信号的印制线也会从邻近的印制线耦合到射频信号并造成电路问题</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">甚至再次辐射出干扰信号</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">。因此应将所有通过交流电流的印制线设计得尽可能短而宽，这意味着必须将所有连接到印制线和连接到其他电源线的元器件放置得很近。印制线的长度与其表现出的电感量和阻抗成正比，而宽度则与印制线的电感量和阻抗成反比。长度反映出印制线响应的波长，长度越长，印制线能发送和接收电磁波的频率越低，它就能辐射出更多的射频能量。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">为电源开关或同步整流功能的设计选择合适的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">MOSFET</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">也能有助于减少电磁干扰，当</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">MOSFET</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">器件断电时，低的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">C▼oss▼(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">象</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">FDS6690A)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">能减少尖峰脉冲的干扰。</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">主要的电流回路</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">——</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">嵌入式开发和嵌入式</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><a href="http://arm9arm7.xinwen520.net/"><font face="Times New Roman">ARM</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">的</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计</span></b></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">每一个开关电源都有四个电流回路</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">图</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">1)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">，回路之间保持相对独立，在一个良好布局的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">，其重要性顺序如下：</span></p>
<p style="MARGIN: 0cm 0cm 0pt 20pt; TEXT-INDENT: -12pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">电源开关交流回路</span></p>
<p style="MARGIN: 0cm 0cm 0pt 20pt; TEXT-INDENT: -12pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">输出整流交流回路</span></p>
<p style="MARGIN: 0cm 0cm 0pt 20pt; TEXT-INDENT: -12pt"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">输入信号源电流回路</span></p>
<p style="MARGIN: 0cm 0cm 0pt"><span style="mso-ansi-language: ZH-CN"><span style="mso-spacerun: yes"><font face="Times New Roman">&nbsp;</font></span></span> <span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">输出负载电流回路</span></p>
<p style="MARGIN: 5pt 0cm"><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">接地很重要</span></b> <span style="mso-ansi-language: ZH-CN"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal">——</b></font></span><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">嵌入式开发和</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><a href="http://blog.sina.com.cn/armodm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌入式</span><font face="Times New Roman">ARM</font><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span></a></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">的</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计</span></b></p>
<p style="MARGIN: 5pt 0cm"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计者要确保每一个大电流的接地端采用尽量短而宽的印制线，通常，滤波电容的公共端应是其它的接地点耦合到大电流的交流地的唯一连接点。</span></p>
<p style="MARGIN: 5pt 0cm"><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">高电压交流节点</span></b> <span style="mso-ansi-language: ZH-CN"><b style="mso-bidi-font-weight: normal"><font face="Times New Roman">——</font><a href="http://hi.baidu.com/armodm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌入式开发</span></a></b></span><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">和嵌入式</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">开发板的</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计</span></b></p>
<p style="MARGIN: 5pt 0cm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">每一个开关电源内有一个节点，与其它节点相比，它的交流电压最高，这一节点是出现在电源开关管漏极</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">或集电极</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">的交流节点。在非隔离的</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">DC/DC</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">变换器中，这一节点也可连接到电感及接到</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">(</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">或输出到</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">整流器；在隔离变压器的结构中，这一节点与变压器的线圈分开。它在电性能上仍表现为公共节点，但仅通过变压器反映，每一个要分别进行设计。</span></p>
<p style="MARGIN: 5pt 0cm"><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">并联滤波电容</span></b> <span style="mso-ansi-language: ZH-CN"><font face="Times New Roman"><b style="mso-bidi-font-weight: normal">——</b></font></span><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">嵌入式开发和嵌入式</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">ARM</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">开发板的</span></b><b style="mso-bidi-font-weight: normal"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span></b><b style="mso-bidi-font-weight: normal"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计</span></b></p>
<p style="MARGIN: 5pt 0cm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">电容经常并联使用以减少滤波电容的并联等效串联电阻</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">(ESR)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">，这一做法也使每一个电容能分流一部分波纹电流，以使每一个电容都能在其波纹电流的规范内正常工作。只有当电容间的印制线阻抗及每个波纹电流源相同时，才会</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">“</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">平均分流</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">”</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">波纹电流，这就要求在整流器或电源开关管之间电容间的印制线必须等长且等宽。</span></p>
<p style="MARGIN: 5pt 0cm"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">深圳龙人计算机有限公司拥有</span><span style="mso-ansi-language: ZH-CN"><a href="http://www.armodm.com/"><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">嵌入式产品事业部</span></a></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">，</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">PCB</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">设计工作室，反向技术研究所和</span><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">SMT</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: ZH-CN">加工厂等。嵌入式产品事业部</span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在为公司提供嵌入式</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">解决方案和</span><span lang="EN-US"><font face="Times New Roman">OEM/ODM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">研发服务的同时提供</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">开发板</span><span lang="EN-US"><font face="Times New Roman">(</font><a href="http://arm9arm7.blog.bokee.net/"><font face="Times New Roman">ARM9</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">开发板和</span></span><font face="Times New Roman">ARM7</font><span lang="EN-US" style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><span lang="EN-US">开发板</span></span></a><font face="Times New Roman">)</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、</span><span lang="EN-US"><font face="Times New Roman">ARM9</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">核心板、</span><span lang="EN-US"><font face="Times New Roman">ARM9</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">学习板、</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">工控板及</span><span lang="EN-US"><font face="Times New Roman">ARM</font></span><span style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">教学实验系统等嵌入式产品。网址：</span><span lang="EN-US"><a href="http://www.armodm.com/"><font face="Times New Roman">http://www.armodm.com</font></a></span></p>
<p style="MARGIN: 5pt 0cm"><span style="mso-ansi-language: ZH-CN"><font face="Times New Roman">&nbsp;</font></span></p> ]]></description>
		<eb:creationDate>2008-03-20 12:01:03</eb:creationDate>
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		<title><![CDATA[ 抄板、PCB抄板和PCB设计教程：PowerPCB如何更改过孔数据 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/577.html</link>
		<description><![CDATA[ <a href="http://images.blog.tom.com/newimg/469/598/2008/0214/1202958889.jpg" target="_blank"><img src="http://images.blog.tom.com/newimg/469/598/2008/0214/1202958889.jpg"></a><br>
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<div class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">抄板、PCB抄板和PCB设计教程：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PowerPCB<font face="宋体">如何更改过孔数据</font></span>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">拥有</font></span><span><a href="http://pcblab.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板工作室</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、</font></span><span><a href="http://pcbvoip.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、</font></span><span><a href="http://blog.sina.com.cn/pcbcblab"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密工作室</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和</font></span><span><a href="http://www.smtodm.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工厂</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">，龙芯世纪从事PCB行业多年，拥有丰富抄板和PCB设计经验。专业提供PC</font></span><span><a href="http://hi.baidu.com/pcbcblab"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">B<font face="宋体">抄板/改板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、</font></span><span><a href="http://pcblab.blog.ccidnet.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计/Layout</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、</font></span><span><a href="http://pcbcblab.blog.sohu.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密/IC解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和</font></span><span><a href="http://pcbcblab.blog.bokee.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">贴片加工/样机制作</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">服务。以下龙芯世纪为您介绍如何利用PCB抄板软件</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PowerPCB<font face="宋体">更改过孔数据</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">如何在画线时添加过孔？并且可以修改过孔的大小？</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">我知道在画线时只需按&nbsp;F4或是右键换层就可以快速的添加一个过孔，但是如何可以快速的修改这个过孔的尺寸？？</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">一般的过孔默认值为&nbsp;40/20mil&nbsp;，我想修改为&nbsp;60/30mil，如何修改？？？？</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://blog.tom.com/pcbcblab"><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">设计&nbsp;</font></span><span><a href="http://hexun.com/pcbcblab"><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">抄板公司&nbsp;芯片解密&nbsp;SMT</font></span><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">加工&nbsp;</font></span><span style="FONT-WEIGHT: bold; FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">印刷电路板</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪回答：</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">你要在setup里设两种过孔，或更多，看你用多少了。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">在走线的时个按&nbsp;V&nbsp;--回车&nbsp;就可以换了。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">你的一块板是不可能做它四五种过孔的，一般都是一样大，有的板可能会需要两种。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">POWERPCB<font face="宋体">中的过孔是不能只改一个的，改了一个，相同的都会改变，也不能象PROTEL那样随意放孔，必需有条线和它连接才可以。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">那些属性不用去理它，选了你要的过孔，点apply就行了。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">关于PCB抄板、</font></span><span><a href="http://pcbcblab.blogbus.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、</font></span><span><a href="http://pcbcblab.blog.bokee.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、单片机解密和SMT加工等技术性文章请登陆：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span></p>
</div> ]]></description>
		<eb:creationDate>2008-02-14 11:14:54</eb:creationDate>
		<eb:modificationDate></eb:modificationDate>
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		<title><![CDATA[ PCB抄板和PCB设计中PCB板返修时PCB组件预热的三个方法 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/576.html</link>
		<description><![CDATA[ &nbsp;
<div class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板和PCB设计中PCB板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">时</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">组件预热的三个方法</font></span>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">(pcbchaoban)</span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">以下是龙芯世纪</font></span><span><a href="http://www.pcblab.net/PCB/index.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室凭着多年行业研究和实践经验总结的关于PCB抄板和</font></span><span><a href="http://pcblab.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">中PCB板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">时</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">组件预热的三个方法</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　如今，预热PCB组件方法分为三类：烘箱、热板和热风槽。在</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">印刷电路板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修和进行再流焊拆卸元器件之前使用烘箱来预热基板，是行之有效的。而且，预热烘箱在烘烤掉某些集成电路中内部湿气和防止爆米花现象上，采用烘烤是一个有利方法。所谓爆米花现象是指返修的SMD器件在湿度上高于正常器件的湿度在突然受到快速升温时会发生的微崩裂。PCB</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">电路板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">在预热烘箱中的烘烤时间较长,&nbsp;一般长达8小时左右。&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://pcbvoip.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">抄板&nbsp;PCB设计</font></span><span><a href="http://blog.sina.com.cn/pcbcblab"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">&nbsp;<font face="宋体">印刷电路板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">板&nbsp;芯片解密</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　预热烘箱的一个缺陷是不同于热板和热风槽，预热时由一个</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">技术员进行预热和兼同时返修是行不通的。而且，对烘箱来讲做到迅速冷却焊点是不可能的。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　热板是预热PCB板最无效的办法。因为要维修的PCB组件不全是单面的,&nbsp;当今是混合技术的世界，一面全部是平整或平面的PCB组件的确是少见的。PCB在基板两边一般都要安装元器件。这些不平整的表面采用热板预热是不可能的。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　</font></span><span><a href="http://hi.baidu.com/pcbcblab"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和PCB设计中</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">热板的第二个缺陷是一旦实现焊料再流，热板仍会持续对PCB组件释放热量。这是因为，即使拔掉电源之后，热板内仍会有储存的残余热量继续传导给</font></span><span><a href="http://pcbcblab.blog.dianyuan.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">P</span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">CB</span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">阻碍了焊点的冷却速度。这种阻碍焊点冷却会引起不必要的铅的析出形成铅液池，使焊点强度降低和变差。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板和PCB设计中</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">采用热风槽预热的优点是:&nbsp;热风槽完全不考虑PCB组件的外形（和底部结构），热风能直接迅速地进入PCB组件的所有角落和裂缝中。使整个PCB组件加热均匀,&nbsp;且缩短了加热时间。</font></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司拥有PCB抄板工作室、</font></span><span><a href="http://pcbcblab.zhan.cn.yahoo.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计工作室</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、芯片解密工作室和SMT加工厂，龙芯世纪从事PCB行业多年，拥有丰富抄板和PCB设计经验。专业提供</font></span><span><a href="http://pcbcblab.sogua.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板/改板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB设计/Layout、芯片解密/IC解密和SMT贴片加工/样机制作服务。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电话&nbsp;(TEL):</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">0755-83511993,83676200</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">魏小姐</font></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0755-</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21199019</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21193600</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">余小姐</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">邮箱(E-mail)：PCBLab@126.com</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">联系地址：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">深圳市福田区福虹路世界贸易广场荟景豪庭12F</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;<font face="宋体">邮编：518033</font></span></p>
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		<eb:creationDate>2008-02-14 11:14:16</eb:creationDate>
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		<title><![CDATA[ PCB板返修时的两个关键工艺——抄板、PCB抄板和PCB设计技术 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/575.html</link>
		<description><![CDATA[ &nbsp;
<div class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">板返修时的两个关键工艺</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——<font face="宋体">抄板、PCB抄板和PCB设计技术</font></span>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪科技有限公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">提供抄板、</font></span><span><a href="http://www.pcblab.net/PCB/index.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板/改板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、芯片解密、IC解密和</font></span><span><a href="http://www.pcblab.net/SMT/index.html"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">服务，以下龙芯世纪科技有限公司的工程师为您介绍抄板、</font></span><span><a href="http://pcblab.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和PCB设计技术知识——</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">PCB<font face="宋体">板返修时的两个关键工艺</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">对于成功返修PCB板起帮助作用的两个最关键工艺，也是两个最容易引起</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">抄板和PCB设计工程师</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">忽视的问题：&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">在</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">流之前适当预热</font></span><span><a href="http://pcbvoip.xinwen520.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">印刷电路</font></span><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">；&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">在</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">流之后迅速冷却焊点。&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　由于这两个根本工艺经常为</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">电路板</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">返修技术人员所忽视，事实上，有时返修后比返修之前的状况更糟糕。尽管有些“返修”缺陷有时能被后道工序检验员所发现，但多数情况下总是看不出来，但在以后电路试验中马上会暴露出来。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">2<font face="宋体">．预热——</font></span><span><a href="http://pcblabjy.blog.163.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">电路板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">成功返修的前提</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　尽管“返修”后看上去很好，但就象人们常说的一句话：“手术成功了，可病人不幸死去”。&nbsp;巨大热应力的产生原因，常温下(21℃)的PCB组件突然接触热源为约370℃的烙铁、去焊工具或热风头进行局部加热时，对</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">印刷</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电路板及其元器件有约349℃的温差变化,&nbsp;产生”爆米花”现象。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">抄板&nbsp;PCB抄板&nbsp;PCB设计&nbsp;印刷电路板&nbsp;PCB板&nbsp;SMT加工</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　由于</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">板的预热会降低再流温度,&nbsp;所以波峰焊、IR/汽相焊和对流再流焊均可以在大约260℃左右下进行焊接的。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">3<font face="宋体">．预热的好处是多方面的和综合的</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——<font face="宋体">抄板、PCB抄板和P</font></span><span><a href="http://pcblab.blog.ccidnet.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">CB<font face="宋体">设计技</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">术</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">4<font face="宋体">．减少返修使电路板更可靠</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　这么说来，仍没有充分理由说明整块板的返修温度不能高于生产工艺中的再流焊温度，从而接近半导体制造厂所推荐的目标温度。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">5</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">．&nbsp;PCB组件中焊点的二次冷却</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——</span><span><a href="http://pcbcblab.blog.sohu.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB抄板和PCB设计技术</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　如前所述，SMT对PCBA（印制板组件）返修的挑战在于返修工艺应该模仿生产的工艺。事实证明:&nbsp;第一，在再流前预热PCB组件是成功生产PCBA所必需的；第二，再流之后立即迅速冷却组件也是很重要的。而这两个简单工艺一直被人们所忽视。但是，在通孔技术以及敏感元件的微型焊接中，预热和二次冷却更显得重要。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">常见的再流设备如链式炉，PCB组件通过再流区后立即进入冷却区。随着PCB组件进入冷却区，为达到快速冷却,&nbsp;对PCB组件通风是很重要的，一般返修与生产设备本身是结为一体的。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　PCB组件再流之后放慢冷却会使液体焊料中的不需要的富铅液池产生会使焊点强度降低。然而，利用快速冷却能阻止铅的析出，使晶粒结构更紧，焊点更牢固。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">7<font face="宋体">．结束语</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">——<font face="宋体">抄板、</font></span><span><a href="http://pcbcblab.co.bokee.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和PCB设计技术</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　正确预热和再流时的二次冷却PCB组件的好处有很多，需要把这两种简单程序纳入技术人员的返修工作中。事实上，预热PCB时，技术员可以同时做其它准备工作，如在PCB板上涂焊膏和焊剂。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　当然，需要解决新返修的PCB组件工艺问题，因为它还未通过电路试验，这也是一种真正的节约时间。显然，不必将在返修中造成PCB报废而节约了成本，一分预防抵得十二分治疗。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　相应地，可减少因基板脱层，生斑点或气泡，翘曲，褪色和过早硫化而消除过多的废品。正确使用预热和二次冷却是PCB组件两个最简单，且最必要的返修工艺。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">深圳</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪科技有限公司</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">是一家专业PCB设计、</span><span><a href="http://pcbcblab.blog.bokee.net/"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB&nbsp;Layout</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、抄板、</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">PCB抄板、印刷电路板抄板及</span><span><a href="http://hexun.com/pcbcblab"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Arial'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">IC芯片解密</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">的抄板公司，能根据客户的需求,提供无论单、双面、多层板、高频板等的PCB抄板、改板、PCB设计、</span><span><a href="http://blog.tom.com/pcbcblab"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Arial'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB原理图设计</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">、BOM清单、样机调试及制作业务。</span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电话&nbsp;(TEL):</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">0755-83511993,83676200</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">魏小姐</font></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0755-</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21199019</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21193600</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">余小姐</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">邮箱(E-mail)：PCBLab@126.com</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">联系地址：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">深圳市福田区福虹路世界贸易广场荟景豪庭12F</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;<font face="宋体">邮编：518033</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"></p>
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		<eb:creationDate>2008-02-14 11:13:39</eb:creationDate>
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		<title><![CDATA[ 如何对SMT电子产品进行PCB设计-龙芯世纪专业PCB抄板 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/559.html</link>
		<description><![CDATA[ <div class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">如何对SMT电子产品进行PCB设计</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">-<font face="宋体">龙芯世纪专业PCB抄板</font></span>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">拥有</font></span><span><a href="http://pcblab.blog.ccidnet.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">工作室、PCB设计工作室、芯片解密工作室和SMT加工厂，专业提供PCB抄板/改板、PCB设计/Layout、</font></span><span><a href="http://pcblabjy.blog.163.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密/IC解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">和SMT贴片加工/样机制作服务。龙芯世纪从事PCB行业多年，拥有丰富经验。本文就是龙芯世纪为你介绍的</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">如何对SMT电子产品进行</font></span><span><a href="http://pcbchaoban.tech.topzj.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">1<font face="宋体">．首先确定电子产品功能、性能指标、成本以及整机的外形尺寸的总体目标</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">新产品开发设计时，首先要给产品的性能、质量和成本进行定位。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;—<font face="宋体">般情况下，任何产品设计都需要在性能、可制造性及成本之间进行权衡和折中，因此在设计时首先要给产品的用途、档次定位。<a href="http://images.blog.tom.com/newimg/469/598/2008/0130/1201678631.jpg" target="_blank"><img src="http://images.blog.tom.com/newimg/469/598/2008/0130/1201678631.jpg"></a><br></font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">2.</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电原理和机械结构设计，根据整机结构确定PCB的尺寸和结构形状。画出SMT印制板外形工艺图，标出PCB的长、宽、厚，结构件、装配孔的位置、尺寸，留出边缘尺寸等，使电路设计师能在有效的范围内进行布线设计(见图)。</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB<font face="宋体">设计&nbsp;SMT加工&nbsp;</font></span><span><a href="http://pcbchaoban.anytome.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">抄板&nbsp;芯片解密</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">3<font face="宋体">．确定工艺方案</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;(1)<font face="宋体">确定组装形式</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">组装形式的选择取决于电路中元器件的类型、电路板的尺寸以及生产线所具备的设备条件。印制板的组装形式的选原则：</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">遵循优化工序、降低成本、提高产品质量的原则</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">例如：</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;<font face="宋体">能否用单面板代替双面板；</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">更多关于</font></span><span><a href="http://blog.sina.com.cn/pcbljycb"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">、PCB设计、芯片解密、单片机解密和</font></span><span><a href="http://pcbchaoban.blog.dianyuan.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">等技术性文章请登陆：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪服务范围：</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB抄板工作室提供PCB抄板、PCB改板、电路板抄板和线路板抄板服务</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板/改板</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/ChaoBan</span></a></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪PCB设计工作室提供PCB设计、PCB&nbsp;Layout、电路板设计、线路板设计服务</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/SheJi"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计/Layout</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/SheJi"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/SheJi</span></a></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: left"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪芯片解密工作室提供芯片解密、IC解密、单片机解密及MCU解密服务</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/PCB/IC"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密/IC解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.pcblab.net/PCB/IC"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net/PCB/IC</span></a></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪SMT加工厂提供SMT加工、SMT贴片、SMT贴片加工、样机调试和样机制作</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.smtodm.com/"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工/样机制作</font></span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">：</font></span><span><a href="http://www.smtodm.com/"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.smtodm.com</span></a></span></p>
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		<eb:creationDate>2008-01-30 15:37:16</eb:creationDate>
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		<title><![CDATA[ MCU单片机解密及IC芯片解密知识：加密锁性能判定 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/558.html</link>
		<description><![CDATA[ &nbsp;
<div class="0" style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">MCU<font face="宋体">单片机解密及IC芯片解密知识：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">加密锁性能判定</font></span>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">文章整理：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">(pcbchaoban)</span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">加密锁很小巧，包含的技术内容却很丰富。一般我们从三个方面分析</font></span><span><a href="http://pcbchaoban.blog.zj.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">加密锁</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">的性能：&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　第一个是</font></span><span><a href="http://pcblabjy.blog.163.com/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">加密原理</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">，或者说加密锁有些什么功能，这往往是针对一些解密方法发展起来的，最需要创造性的地方就是这里。国内产品在这个方面一直与国外产品具备足够的竞争能力。&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">MCU<font face="宋体">解密&nbsp;</font></span><span><a href="http://hexun.com/pcbchaoban"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">单片机解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">芯片解密&nbsp;</font></span><span><a href="http://blog.tom.com/pcb_chaoban"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: '宋体'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">IC<font face="宋体">解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;PCB<font face="宋体">抄板</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">　　第二个是加密锁的可靠性、稳定性、兼容性、透明性等。这些是对锁的基本要求，但是做完整并不容易，尤其是兼容性、透明性问题，加密厂家在这方面有着丰富的经验，但是没有谁可以100%保证。透明性是锁的一个比较特殊的指标，由于锁是工作在并口(打印口)，并口还会有其他设备，比如打印机、绘图仪、硬盘、光驱等，锁如果影响到原来设备的正常工作就是透明性不够好，完全的透明是难以做到的，一般的加密厂家不保证锁对并口硬盘、光驱等设备的透明性。&nbsp;</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">深圳</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">龙芯世纪科技有限公司</font></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">是一家专业</span><span><a href="http://pcbchaoban.5d6d.com/"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Arial'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB设计</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">、</span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">PCB&nbsp;Layout<font face="宋体">、抄板、</font></span><span><a href="http://pcbchaoban.co.bokee.net/"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Arial'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB抄板</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">、印刷电路板抄板及IC芯片解密的抄板公司，能根据客户的需求,提供无论单、双面、多层板、高频板等的</span><span><a href="http://cblog.chinadaily.com.cn/port/pcbchaoban/"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Arial'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB抄板、改板</span></a></span><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: 'Arial'; mso-spacerun: 'yes'">、PCB设计、PCB原理图设计、BOM清单、样机调试及制作业务。</span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">详</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">情见：</font></span><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">http://www.pcblab.net</span></a></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">电话&nbsp;(TEL):</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">0755-83511993,83676200</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">魏小姐</font></span></p>
<p style="VERTICAL-ALIGN: baseline; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;0755-</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21199019</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">,</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">21193600</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;<font face="宋体">余小姐</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><font face="宋体">邮箱(E-mail)：PCBLab@126.com</font></span></p>
<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">联系地址：</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">深圳市福田区福虹路世界贸易广场荟景豪庭12F</font></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;<font face="宋体">邮编：518033</font></span></p>
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		<eb:creationDate>2008-01-30 15:36:09</eb:creationDate>
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		<title><![CDATA[ 龙芯世纪科技有限公司提供抄板、PCB抄板/改板、芯片解密、IC解密和SMT加工服务 ]]></title>
		<link>http://blog.tom.com/pcbcblab/article/557.html</link>
		<description><![CDATA[ &nbsp;
<div class="0" style="MARGIN-TOP: 5pt; LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span><a href="http://www.pcblab.net/"><span style="FONT-SIZE: 10pt; COLOR: rgb(0,0,255); FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">深圳龙芯世纪科技有限公司</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">主要为您提供以下服务项目，诚挚欢迎您来函来电或上门惠顾咨询洽谈业务。</font></span>
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<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;</span><span><a href="http://www.pcblab.net/PCB/ChaoBan"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">抄板</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">：提供单层、双层，多层（包括28层以上）的PCB抄板、PCB克隆业务，其中也包括高难的盲埋孔PCB板（如数钻盲孔板、数钻埋孔板、一阶（二阶）激光盲孔板、陶瓷板、铝基板，及超高频10GHz以上的各类线路板等）；PCB抄板对象涉及“电脑主板（包括笔记本电脑）、数码相机、摄像机、手机、小灵通、对讲机、GPS、DVB、卫星接收仪器设备、蓝牙设备及其他高精密电子产品等；&nbsp;我们都能为您100%准确的克隆。&nbsp;我们承诺以最优的价格为您做最好的PCB抄板。&nbsp;</font></span></p>
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<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;</span><span><a href="http://www.pcblab.net/PCB/SheJi"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">PCB<font face="宋体">设计</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">：PCB&nbsp;设计室在北京、深圳两地拥有&nbsp;100&nbsp;名从事技术开发和&nbsp;PCB&nbsp;设计工作多年的软、硬件工程师，能根据客户的需求，提供高速PCB设计、EMC设计、PCB&nbsp;Layout、原理图制作、BOM清单制作等业务。</font></span></p>
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<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;</span><span><a href="http://www.pcblab.net/SMT/Model"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">样机制作</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">：深圳龙人计算机“样机制作”服务主要从五个方面展开：&nbsp;认真识别客户的要示、向客户提供积极专业的意见和方案、样机研究与开发、样机制作与测试、样机定型设计及批量生产。深圳龙人计算机一流的样机制作团队，在每一个样机制作项目中，我们都会做充足的准备，严格监控每一个制作流程，确保制作出来的样机100%满足客户的要求。</font></span></p>
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<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;</span><span><a href="http://www.pcblab.net/SMT/SMT"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'">SMT<font face="宋体">加工</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">：我们拥有国外高档最新系列全自动多功能贴片机，可贴装包括0201在内的贴片器件，以及脚距在0.3mm的超高精度&nbsp;QFP&nbsp;、&nbsp;BGA&nbsp;等芯片，并配有进口七温区全热风回流焊炉、全自动免清洗喷雾双波峰焊和自动锡膏印刷机，确保焊接精度和质量。主要承接“快速样品SMT加工”、“小批量SMT加工”、“中批量SMT加工”。</font></span></p>
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<p style="LAYOUT-GRID-MODE: char; TEXT-ALIGN: justify"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;&nbsp;</span><span><a href="http://www.pcblab.net/PCB/IC"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; TEXT-DECORATION: underline; mso-spacerun: 'yes'"><font face="宋体">芯片解密</font></span></a></span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><font face="宋体">：深圳龙人计算机提供专业单片机(MCU)解密、专用IC解密、PLD解密,CPLD解密、单片机开发服务，嵌入式系统的软件和硬件的设计，芯片的设计、硬件的系统设计、软件的系统设计以及软件的解密等（本公司解密仅限合法性,有关法律上的一切责任纠纷均由对方承担，本司概不负责），为国内外电子企业找回丢失的单片机资料或学习国外单片机企业先进的设计思路提供技术支持，公司以专业、专注的服务精神，坚持以市场需求为导向，客户要求为己任，视每位客户为合作伙伴，依靠先进的技术、优秀的团队和现代化的管理尽可能的为客户提供最新市场资讯和最佳的服务，以争取和客户取得双赢为追求之目标</font></span></p>
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		<eb:creationDate>2008-01-30 15:35:33</eb:creationDate>
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