[SI-LIST] Spectre S-parameter based modeling- Stability issues
- From: Madhusudanan K Sampath <mkeezhve@xxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Sat, 02 Dec 2006 00:16:01 -0500
Hi All,
I am using n-port component in spectre to perform time domain simulation
using touchstone s-parameter files for power planes which are obtained from
measurement/full wave tools. In many cases, the simulation explodes due to
stability reasons. What are the possible causes of this and how can one
solve this issue. I think Spectre n-port component uses convolution methods
to perform time domain simulation from frequency domain s-parameter data and
hence are prone to convergence issues. If so how does it enforce passivity
in the model. I verified the s-parameter matrix for eigenvalues and it
proves the data is not passive. I would like to compensate for passivity and
then re-try the time domain simulation. There are quite a few interesting
passivity enforcements techniques in literature by Dr. B. Gustavsen and Dr
S.G. Talocia . However they are applied on the rational functions which are
obtained by vector fitting the data. My question is if I vector fit the
data, enforce the passivity using these techniques and then calculate the
S-parameter matrix for each frequency point from the passive rational
function model. Will spectre give stable results with this new data ?
Please share your ideas and views on this. Thanks in advance.
Madhu
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