[SI-LIST] Re: Need your Opinion and expertise
- From: "Ihsan Erdin" <erdinih@xxxxxxxxx>
- To: xileil@xxxxxxxxxxx
- Date: Wed, 19 Jul 2006 18:54:02 -0400
On 7/19/06, Xilei Liu <xileil@xxxxxxxxxxx> wrote:
>
> Abe,
>
> I have to clarify that Pade' approximation is not a new method from the
> popular approches you stated. If you have commercial simulators or field
> solvers that can extract RGLC from S-parameters available, just use it.
> Many
> simulators employ Pade' approximation method to implement the extraction.
> If
> you want to extract RGLC from S-parameters or voltage/current by yourself,
> you may refer to "R. Nakhla and R. Achar. Model-Reduction
> Algorithms(Principles, AWE, CFH and Macromodeling)"
>
> If you work out Z, Y matrice or z, y from S-parameters or V/I, then use a
> Pade' approximation routine that deals with complex numbers to get a
> relationship f(s)=b0+b1(s)+b2(s^2)+.../1+a1(s)+a2(s)+..., where s=jw. If
> the
> order of s is small (1 or 2), then it's possible for you to work out a
> simple circuit model by hand, otherwise you will need a micromodel. Any
> way
> you still need to evaluate the stability.
...and causality, which is a humongous task. So my two cents to anyone who
is not a researcher in macromodeling and needs the parameters for
development purposes only is to stick with his/her commercial tool and prey
it's not going to be hit by the causality problem.
Regards
Ihsan
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