FreeLists / si-list / [SI-LIST] Re: (no subject) - summary

[Matthew Herndon <mherndon@xxxxxxxxx>]

There was lots of interest in my summary of the "(no subject)" thread 
about dispersion and about modeling s-parameters in SPICE, so I'll post 
it on this list in a few days after I make some additions.

I apologize for the large number of requests for the full summary which 
were sent to this list - I mentioned in my earlier post that such 
requests should be offline. Please, if you have a comment for me only, 
send it directly to me at mherndon@xxxxxxxxxx Of course, if you want to 
discuss an issue of general interest, feel free to post your 
question/comment on the list.

At least one other vendor of a SPICE-like simulator which simulates 
s-parameters has contacted me. The list in my summary is simply a 
tabulation of the simulators mentioned in the thread. If you have (or 
know of) a simulator you would like listed, please sent me email 
OFFLINE (mherndon@xxxxxxxxx) and I'll include it in the list.

One question which was left unanswered is: does non-TEM propagation 
imply dispersion? Would anyone care to comment?

Also, a BRIEF explanation of Kramers-Kronig and a reference would be 
useful.

Finally, Scott McMorrow made a point about dispersion which puts the 
discussion in perspective (I have added to the latest version of my 
summary):
"In reality, manufacturing tolerances and
non-uniformity of materials causes much larger variations in actual
transmission line performance than the change in Er across frequency.
  However, that does not mean that it does not exist."
And, I would add, dispersion is an interesting and provides insight.

-matt
Matt Herndon
ECAD Group
Apple Computer



On Friday, December 6, 2002, at 11:42 AM, Zhou, Xingling (Mick) wrote:

>
> Hello,
>
> Did anybody successfully generate broadband (DC-20GHz) SPICE model 
> from S
> matrix for complex structures using the SPICE generator in ADS ? Or any
> other alternatives. I know Ansoft fullwave SPICE does the work.
> Unfortunately, some circuit simulators do not support the frequency
> dependent lookup table sources. We can definitely use [S] directly, 
> but some
> users still prefer SPICE models. Any experience to share ?
>
> Thanks,
>
> Xingling(Mick) Zhou, PhD
> Signal Integrity Technologist
> Agere Systems
>
> Tel: 610-712-7462
> Fax: 610-712-4081
>
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