allegro叠层设置中shield一栏的作用是什么？

taizitaizi · 发表于 2012-4-2 08:39

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这个shield栏，我点与不点，我尝试了，对操作没有什么不同啊，求解

taizitaizi · 发表于 2012-4-2 09:09

自己顶一下，大家来探讨下，这个shield选项只有在plane层才有

taizitaizi · 发表于 2012-4-2 09:24

我这是16.5版本

taizitaizi · 发表于 2012-4-2 10:08

没人知道吗，我看了allegro的help文档，也没说是干啥用的

mehardworking · 发表于 2012-4-5 00:45

崇拜英文好的牛人，我至今看不懂英文的help文件

lgl2466 · 发表于 2012-4-5 14:03

我也想知道！

taizitaizi · 发表于 2012-4-6 21:57

就这个还没人解答啊，看来我这小菜鸟要努力啊

pjh02032121 · 发表于 2012-4-6 22:34

Shield : (in the stackup editor) If shield option is not checked, Allegro PCB SI accept planes are not ideal or solid and have multiple planes and it forces to find effects plane boundaries.

原文如下：
Allegro PCB SI can deal with splits or slot, void problems. Using "shield" and "ANL_MIN_VOID_AREA" Properties, you can see effects because of impedance discontinuity.

Shield : (in the stackup editor) If shield option is not checked, Allegro PCB SI accept planes are not ideal or solid and have multiple planes and it forces to find effects plane boundaries.

ANL_MIN_VOID_AREA : (minimum void area) For void or slot it is useful. Allegro calculate void effects in power layers via transtion. (Via perforations) You can find "ANL_MIN_VOID_AREA" property in the User references --> Signal Analysis section. Maybe you must play "Geometry Window" and "min coupled length".

In my some design, I have to route transmission lines over the voids, slots and near edge of power plane.I saw Impedance changing. For example, In slots or void Allegro add high impedance ransmission line according to other transmission lines. In split planes you know adding capacitor where you are rossing the split will give more realistic result.