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I have started the design of a high speed digital design multi-gbps interfaces. I would like to use Altium designer for PCB analysis (signal integrity). But I am wondering if altium uses the IDEAL model of a capacitor for simulation. The impedance/frequency response of typical capacitors is something like the below figure enter image description here

So the impedance/frequency characteristic is quite different than an IDEAL model (There is a parallel issue with inductors and partly resistors too). My Questions are:

1-Does Altium use ideal models for signal integrity analysis?

2-If the answer to 1 is Yes then why? To what degree results are valid?

3-What is the policy of HyperLynx in this situation?

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I cannot answer to the Altium part of your question.

Hyperlynx permits the use of a simple model (built in perfect capacitor), an IBIS model file (where you can define the parameters) or by using a S-parameter model.

You can assign an IBIS model, S parameter or perfect capacitor from this dialog:

Hyperlynx model selector

S parameter models are available from TDK and AVX and perhaps others; these will probably give you the best results for signal integrity. Hyerlynx supports the Touchstone format.

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