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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.
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原文如下：! A$ s, `2 B& A
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.
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, `. J! K+ n. @; X1 t SShield : (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.: C8 r t W+ p3 b Y/ Q! _
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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".
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& @' [2 C7 C' X. \3 o7 Z* n9 HIn 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. |
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发表于 2012-4-2 08:39
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发表于 2012-4-6 22:34
