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evel 发表于 2008-5-25 11:25:00

[讨论] 关于PCIE一些规范以及阻抗问题

按照PCIE的要求:1,长度:越短越好2,pair内误差<=5mil3,layout成differential pair.严格平行对称,保持距离4,端接交流耦合电容5,参考平面GND,离GND平面边沿至少20mil阻抗要求单线:60/55欧姆+-15%,即 51-69或者46.75-63.25欧姆diff-piar:100/85欧姆+-20%,即 80-120或者68-97欧姆请教1,这里的单线阻抗和layout要求不是冲突了吗?一般我们都走pair形式的线啊,好像很少有单根的..2,请教以下叠构第7层,走6/5的PCIE我怎么也算不出85欧姆来.为什么:<table cellspacing="0" cellpadding="0" width="739" border="0" style="WIDTH: 555pt; BORDER-COLLAPSE: collapse;"><colgroup><col width="59" style="WIDTH: 44pt; mso-width-source: userset; mso-width-alt: 1888;"></col><col width="161" style="WIDTH: 121pt; mso-width-source: userset; mso-width-alt: 5152;"></col><col width="160" style="WIDTH: 120pt; mso-width-source: userset; mso-width-alt: 5120;"></col><col width="134" style="WIDTH: 101pt; mso-width-source: userset; mso-width-alt: 4288;"></col><col width="117" style="WIDTH: 88pt; mso-width-source: userset; mso-width-alt: 3744;"></col><col width="108" style="WIDTH: 81pt; mso-width-source: userset; mso-width-alt: 3456;"></col></colgroup><tbody><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl38" width="59" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 44pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"></td><td class="xl38" width="161" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 121pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">prepreg</td><td class="xl38" width="160" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 120pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"></td><td class="xl38" width="134" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 101pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">2116</td><td class="xl38" width="117" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 88pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">4.8</td><td class="xl39" width="108" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 81pt; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: yellow;">FR-4-HTG</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl40" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: #ffcc99;">6</td><td class="xl40" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">Plane</td><td class="xl40" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">1 oz</td><td class="xl40" xfmla="=C2" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">1 oz</td><td class="xl40" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">1.3</td><td class="xl41" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">　</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl38" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"></td><td class="xl42" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #cc99ff;">core</td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"></td><td class="xl42" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #cc99ff;">4mil</td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">3.9</td><td class="xl39" xfmla="=F1" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: yellow;">FR-4-HTG</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl43" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: #99ccff;">7</td><td class="xl43" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">Signal</td><td class="xl43" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">0.5 oz </td><td class="xl43" xfmla="=C4" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">0.5 oz </td><td class="xl43" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">0.65</td><td class="xl44" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">　</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl38" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"></td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">prepreg</td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"></td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">7628</td><td class="xl45" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">8</td><td class="xl39" xfmla="=F1" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: yellow;">FR-4-HTG</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl40" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: #ffcc99;">8</td><td class="xl40" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">Plane</td><td class="xl40" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">1 oz</td><td class="xl40" xfmla="=C6" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">1 oz</td><td class="xl40" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">1.3</td><td class="xl41" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #ffcc99;">　</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl38" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: transparent;"></td><td class="xl42" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #cc99ff;">core</td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;"></td><td class="xl42" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #cc99ff;">4mil</td><td class="xl38" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: transparent;">3.9</td><td class="xl39" xfmla="=F1" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: yellow;">FR-4-HTG</td></tr><tr height="20" style="HEIGHT: 15pt; mso-height-source: userset;"><td class="xl43" height="20" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; HEIGHT: 15pt; BACKGROUND-COLOR: #99ccff;">9</td><td class="xl43" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">Signal</td><td class="xl43" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">0.5 oz </td><td class="xl43" xfmla="=C8" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">0.5 oz </td><td class="xl43" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">0.65</td><td class="xl44" style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; BORDER-BOTTOM: #d4d0c8; BACKGROUND-COLOR: #99ccff;">　</td></tr></tbody></table>我是这样算的:按照polar里的计算:我有疑问的地方就是这里的H1和H2我是按照8mil总厚度来设置的???因为pp就两种不同材料压合,但是我不知道分别厚度和Er具体多少,但是结果应该不至于相差这么大.请问这样的模型和设置有问题吗?究竟出在哪里?希望大侠帮忙斧正,谢谢!!!!!!!!!!!!!!!!!!!!!!!!!!!!

jianlong83 发表于 2008-5-29 11:46:00

PCB決定了無非就是調整線寬和線距，不一定要那么準確，接近85就行，

mary_zhu 发表于 2008-5-29 14:23:00

原来是这样啊

mary_zhu 发表于 2008-5-29 14:24:00

原来是这样啊

chenxiaomei75 发表于 2008-5-29 15:12:00

原来是这样啊

flyingdracular 发表于 2008-5-29 17:16:00

我一般先咨询一下pcb 厂看看。然后似乎应该polar 选1B1A的模型

calf921 发表于 2010-5-13 15:06:27

原来是这样啊

sxz2001sxz 发表于 2011-1-29 13:32:01

原来是这样啊

junlintianxia 发表于 2013-11-27 10:50:55

一直按100欧姆设计的

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[讨论] 关于PCIE一些规范以及阻抗问题