[SI-LIST] Pole/Zero Extraction from measured S-parameter
- From: "Choi, Jong-Sang" <jsfocus@xxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Thu, 21 Feb 2002 23:24:26 +0900
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.
Tel : +82-2-871-3986
Fax : +82-2-871-3985
e-mail : jsfocus@xxxxxxxxxxxxxxxx
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