[SI-LIST] Re: Causality
- From: "Dmitriev-Zdorov, Vladimir" <vladimir_dmitriev-zdorov@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 15 May 2009 09:56:39 -0600
Hi Jennifer,
Did you try Hyperlynx's S-parameter Fitter/Viewer? It is an application inside
Hyperlynx. With that, you can enforce causality and passivity of any
S-parameter data file. The output is available in a form of tables of
poles/residues, or as a SPICE compatible subcircuit. All stages of
transformation are graphically viewable so you can control accuracy.
With that transformer, you simple will not be able to generate non-causal
model, even if you want to :-)
If you can share your data, I'd be glad to build the model for you.
Vladimir
P.S. On thing I'm curious, how exactly you observed non-causality from time
domain simulation? Since time domain simulators all work in sequential manner
(step after step, with increasing time) the response can never come ahead of
the input. Although, I agree that time response could be very different from
what you'd expect from you frequency dependence.
Jennifer Maharani jennifer.maharani@xxxxxxxxx wrote:
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Sent: Thursday, May 14, 2009 12:48:44 PM
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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