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Test nodes and Rnets oh my!

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Hey all.

I am trying to create models for two different circuit components. The first is a single pin test node. Basically the schematic symbol has one and only one pin. I need to create a espice or ibis model of this and have been having a really tough time. All I really want this to be is a small capacitiance to ground. This seems to be quite elusive.

The second model I am trying to create is for a rnet. The schematic symbol has three sections. Two sections of bussed resistors and one section of power pins. For some reason when I try to apply a si model to any one section I cant "hook it up" to the other sections or to VCC. Some help here??

Matt Skogmo


Originally posted in cdnusers.org by MSkogmo
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    Donald,

    We use both SigXp and PCB_SI. At this point, we are extracting the net topology off of the schematic through constraint manager. When we try to extract any net that has one of these test nodes, SigXp complains that all discrete components need models and bails out.

    I am including a little .gif of the resistor nets. In this particular shot, the three components are labeled RN1,2,3 but in reality, they would all be part of the same network... Notice the pin numbers.


    Originally posted in cdnusers.org by MSkogmo
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  • archive

    Donald,

    We use both SigXp and PCB_SI. At this point, we are extracting the net topology off of the schematic through constraint manager. When we try to extract any net that has one of these test nodes, SigXp complains that all discrete components need models and bails out.

    I am including a little .gif of the resistor nets. In this particular shot, the three components are labeled RN1,2,3 but in reality, they would all be part of the same network... Notice the pin numbers.


    Originally posted in cdnusers.org by MSkogmo
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