[SI-LIST] Re: HSPICE S-paramter questions
- From: Ray Anderson <ray.anderson@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 16 Mar 2005 11:56:41 -0800
Scott-
I agree with you completely regarding the speed issue. Another factor to
consider is stability/passivity. S-parameters originating from
measurements (and quite often from simulation/extraction) can exhibit
stability/passivity issues. I do not believe the S element checks and/or
corrects these issues. Most of the available s-parameter to n-port model
tools available have passivity enforcement capability such that the
synthesized n-port model is guaranteed passive. Some of the tools also
have the capability of regenerating a passivity enforced set of
s-parameters from the original input data set. This is accomplished by
"nudging" the problematic parameters until passivity is achieved. In
most cases the response of the resulting data set is acceptably close to
the original (but not passive) data set.
-Ray
Scott McMorrow wrote:
>Ray,
>The other reason for using these other tools is speed. For example,
>after conversion of a Xilinx differential s-parameter model to a Laplace
>pole-zero model, I typically see a 20X speed up in performance when
>compared to the Spice s-element simluations. If you are doing only one
>simulation, then the translation time dominates. But if you are doing
>multiple trace length, connector type, backplane sweeps in simulation,
>then the performance advantages of the Laplace pole-zero model is
>significant, with no decrease in accuracy.
>
>scott
>
>
>
>
--
Raymond Anderson
Senior Signal Integrity Staff Engineer
Product Technology Dept.
Package Engineering Group
Xilinx Inc.
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