[SI-LIST] Re: S-parameter simulation in Time Domain
- From: Brian Young <brian.young@xxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 16 Nov 2001 13:44:59 -0600
Larry,
Many versions of spice have implemented recursive convolution. If your
spice does, then you are in luck. Our internal spice has this capability
and does the rational function approximation, too. The method I use is
1. Run ADS to sweep the needed S-parameters and dump out a citifile.
2. Run our internal spice calling the citifile.
3. Plot the eye diagram.
I doubt if this helps you very much, but I thought you might find it
interesting.
Brian
Larry Smith wrote:
>
> A similar question was asked on SI-list several weeks ago but did not
> get a clear answer. Does anybody have a good way to simulate
> S-parameters in the time domain?
>
> We often have silicon driver and receiver models that are composed of
> proprietary (BSIM or otherwise) transistor by transistor nonlinear
> elements best handled by HSpice, Smart Spice or similar software. We
> want to know the openness of an eye diagram at the far end of a
> transmission path. The transmission path involves two electronic
> packages, printed circuit boards with vias and a connector between
> boards. We may have S-parameter models for some of the components and
> lumped element models for others. The characteristics of nearly all of
> the components are a function of frequency.
>
> The response to the question several weeks ago involved methods for
> obtaining S-parameter models. We can get S-parameter models form
> measurement, extraction from materials and geometries, the guy down the
> hall or the company across the street. The question is, "what do we do
> with the models after we get them?" We want to know the openness of
> the eye diagram at 1 GB/sec or more. We want to know the response of a
> receiver built from nonlinear circuit elements to that eye diagram.
> Does anybody have a good success story in this area? Does anybody have
> software that claims to do this?
>
> Grading scale:
>
> A - Has model to hardware correlation for eye diagram.
> B - Can simulate but does not exactly match lab waveforms.
> C - Above, but not with proprietary spice models.
> D - Simulator has capability but nobody has ever tried it.
> F - Software available in next release.
>
> regards,
> Larry Smith
> Sun Microsytems
--
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* Brian Young phone: (512) 996-6099 *
* Somerset Design Center fax: (512) 996-7434 *
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