[SI-LIST] Re: Pole/Zero Extraction from measured S-parameter
- From: Ray Anderson <Raymond.Anderson@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 21 Feb 2002 09:45:47 -0800 (PST)
Jong-Sang-
I don't have the time at the moment to delve into all technicalities
and details of what you are trying to accomplish, however I just
wanted to mention that there is at least one commercial tool
available that is designed to accomplish the task you propose.
It is 'SPAR' written by Applied Simulation Technology (Apsim).
I believe Hspice has the ability to extract poles/zeroes
from a transfer function as well, but it doesn't generate
the rational function spice model for you.
Given a list of s-parameters SPAR extracts the poles and zeros and
genrates a spice compatible 'black-box' model which in the form
of a ratio of polynomials.
Beware though, that one must be careful that the generated approximation
(Pade' or whatever) exhibits both stability and passivity.
-Ray Anderson
Sun Microsystems Inc.
>
>Dear SI-List members.
>
>I am looking for any method or code for transfer function pole/zero extraction
from measured S-parameter.
>The measured S-parameter is from coaxial cable.
>
>I summarized what I have tried and its results for better advice.
>1. Decide the candidate rational function(6th-order numerator and 6th-order
denomenator) for the cable transfer function.
>2. Execute nlinfit function at MATLAB.
>3. Result : The approximated rational function fits roughly but it doesn't
>seem
to fit accurately enough.
>4. Result : The approximated rational function coefficient includes imaginary
part(i.e. complex coefficient) -> (Is this proper result? Can the Pole/Zero be
extracted from such a complex coefficient?).
>
>Thanks in advance for your help.
>
>------------------------------------------------------
>Jong-Sang Choi
>Ph.D Candidate, Seoul National University, Seoul, Korea.
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