[SI-LIST] Re: time domain simulation of s-parameter

Lynne,

Are any of the "tools that can convert the S-params to an equivalent
passive circuit, which automatically insures passive/causal" that you
refer to commercially available tools?  If so, please advise me which
ones.  The few I have tried have failed my causality test.  You may
reply privately if you don't want to advertise.

Thanks,
Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team=20
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592=20
"A Measurement for every Model and a Model for every Measurement.
Without Correlation, I don't believe either." - Aubrey Sparkman


-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Lynne D. Green
Sent: Thursday, November 29, 2007 2:16 PM
To: saoer.sinaga@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: time domain simulation of s-parameter

Interesting thread so far.

There are tools that can convert the S-params to an equivalent passive
circuit, which automatically insures passive/causal.  Other tools can
"adjust" the S-params to guarantee passivity and causality (such as a
pole/zero format), to account for noise in the data.

The usual caveat applies: the modified model could result in slower
simulation.  For example, slower simulation with added "nodes" is a
known
issue in SPICE.    Some tools let you select the number of RLC stages to
use, so you can trade off accuracy against SPICE simulation time.

- Lynne


"IBIS training when you need it, where you need it."

Dr. Lynne Green
Green Streak Programs
http://www.greenstreakprograms.com
425-788-0412
lgreen22@xxxxxxxxxxxxxx



-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Saoer Sinaga
Sent: Thursday, November 29, 2007 11:02 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: time domain simulation of s-parameter

That's not always the case. When you don't have DC data in your S-par,
not to mention the S-par is not passive guaranteed, your transient
simulation will not converge.
saoer



On 11/29/07, sanjeev_gupta@xxxxxxxxxxx <sanjeev_gupta@xxxxxxxxxxx>
wrote:
>
> Hi SKGUPTA,
>
> Kindly contact ADS online Tech support! ADS provide the most robust =
=3D=20
> convergence on S-parameters.
>
> Sanjeev
> Agilent EEsof
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx] =3D On Behalf Of Sanjeev Gupta
> Sent: Tuesday, November 27, 2007 6:49 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] time domain simulation of s-parameter
>
> Hello All
> I am trying to do time domain simulation using Agilent ADS after =3D=20
> extracting s-parameter model from Power SI.
> But, i am getting lot of convergence issue. Simulation gets terminated

> immediately.  I do not get any time domain waveform.
> kindly suggest a solution.. which tool can solve such problem very=20
> efficiently?
> Thanks in advanve
> Sanjeev
>
>
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