FreeLists / si-list / [SI-LIST] Re: Spectre S-parameter based modeling- Stability issues

["Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx>]

In any real high speed/high power IC analysis, every FUB has different =
loading, pipeline and switching pattern, different area of the clock =
trees has different loading or even speed. None of the above has any =
meaning or easy intepretation in frequency domain but makes a world of =
difference in real life and in time domain. Frequency domain analysis =
only gives you insight into where your potential package resonance is. =
Beyond that you need a finer resolution into your FUB by FUB noise =
budget based on time doamin analysis.


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ihsan Erdin
Sent: Monday, December 04, 2006 6:20 PM
To: thamiral@xxxxxxxxx
Cc: si-list
Subject: [SI-LIST] Re: Spectre S-parameter based modeling- Stability
issues

For the analysis of power delivery systems, I don't really see a big
incentive to use a transient simulator as long as the linear load
assumption holds. This applies to most practical cases. Usually the
frequency domain solution will give enough information for the
decoupling efficiency etc. A time domain response may be desired just
to see the peak-to-peak noise level but then one can easily get it
through IFFT as you put it.

Regards

Ihsan

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