[SI-LIST] Re: Spectre S-parameter based modeling- Stability issues
- From: "Dmitriev-Zdorov, Vladimir" <vladimir_dmitriev-zdorov@xxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 4 Dec 2006 09:19:07 -0800
Hi Ihsan,
Your suggestion would work fine if the entire design that includes the
S-parameter model were linear time-invariant. In case of non-linear
devices and arbitrary topology, the time-domain simulation is the only
available option, and therefore, S-parameter model must allow stable and
accurate simulation in time domain, too. From here are the requirements
on their passivity and causality.
Vladimir
>Date: Sun, 3 Dec 2006 10:30:57 -0500
>From: "Ihsan Erdin" <erdinih@xxxxxxxxx>
>Subject: [SI-LIST] Re: Spectre S-parameter based modeling- Stability
issues
>
>Taha,
>
>The passivity issue is a direct result of integration techniques
employed by the time domain circuit simulators (SPICE, >ELDO, Spectre,
etc.), which are essentially nonlinear differential equation solvers. In
the frequency domain solution of >the MNA matrix, there's no time
stepping algorithm, hence no passivity or stability problems. All you
need to do a >cyclic convolution of the output with the spectrum of the
input pulse and FFT the data into the time domain. One can >easily do
this with less than a 50 line long MATLAB script.
>
>Regards
>
>Ihsan
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