[SI-LIST] Re: Causality
- From: Long Yang <long.0.yang@xxxxxxxxx>
- To: Jennifer Maharani <jennifer.maharani@xxxxxxxxx>
- Date: Fri, 15 May 2009 14:22:37 +0800
Casualty is described in time domain by impulse response of channal transfer
function (S-parameter) as
h(to)=0 if t<to.
So possibly I think there are two root-causes leading to casual problems
1. Theory-based [The simulated or measured S-parameter really has casual
problem]
This reason can be referred to the latest book from page 331 by Stephon
Hall.
It is not easy to judge the casual problem directly in S-parameter.
But I think there would be.
2. Simulation-methodology-based [The simulated or measured S-parameter may
have or have no casual problem]
I think Patrick delivered an explanation about this root-cause.
Different simulation tools treat real, band-limited S-parameter with
different methods, such as extrapolating methodology, sampling methodology,
ans so on.
Consequently some possibly "create" casual problem, while some other do not.
Long Yang
http://blog.ednchina.com/spices/
Don Marquis <http://www.brainyquote.com/quotes/authors/d/don_marquis.html>
- "Procrastination is the art of keeping up with yesterday."
On Fri, May 15, 2009 at 1:16 PM, Jennifer Maharani <
jennifer.maharani@xxxxxxxxx> wrote:
> Thank you all for the offer and advice. I'll try summarize it and take
> necessary actions.
>
> On May 15, 2009, at 1:42 AM, "Yuriy Shlepnev" <shlepnev@xxxxxxxxxxxxx>
> wrote:
>
> > Hi Jennifer,
> >
> > Our Simbeor 2008 tool mentioned by Scott can generate broad-band SPICE
> > models from Touchstone files produced by CST with the number of
> > ports up to
> > few hundreds. Passivity can be enforced and the macro-model is
> > causal by
> > definition.
> > Please send me your S-parameters Touchstone file and I will try to
> > construct
> > the model.
> >
> > Best regards,
> > Yuriy
> >
> > Yuriy Shlepnev, Ph.D.
> > President, Simberian Inc.
> > 2326 E Denny Way, Seattle, WA 98122, USA
> > Tel/fax +1-206-726-1098, tel +1-408-627-7706
> > Cell +1-206-409-2368
> > Skype shlepnev
> >
> > www.simberian.com
> > Simbeor 2008 - Easy-To-Use, Efficient and Cost-Effective
> > Electromagnetic
> > Synthesis Software
> >
> >
> >
> >
> > -----Original Message-----
> > From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx
> > ] On
> > Behalf Of Jennifer Maharani
> > Sent: Thursday, May 14, 2009 12:49 PM
> > To: si-list@xxxxxxxxxxxxx
> > Subject: [SI-LIST] Causality
> >
> > Dear all,
> >
> > I have non-passive non-causal S-parameter. I can use some commercial
> > tools that can generate broadband spice with passivity enforcement.
> > Not with causality enforcement, though.
> >
> > In transient simulation it clearly shows non-causal response.
> >
> > Does anybody know how to resolve this issue? Quick and dirty solution
> > will also be appreciated.
> >
> > Many thanks.
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