I have to ask: if you take the two different sets of s-parameters and put a
step or pulse through them in the time-domain, how much difference do you see?
Todd.
Todd Westerhoff
High-Speed Design Product Marketing | Electronic Board Systems
300 Nickerson Rd, Marlboro, MA 01752
todd_westerhoff@xxxxxxxxxx | office: 508-303-5821 | cell: 978-846-0203
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On ;
Behalf Of Havermann, Gert
Sent: Thursday, July 11, 2019 2:00 AM
To: farhilltramper@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] AW: extract the channel sparam using Matlab
Hi Tramp,
Almost all tools have their own way of dealing with S-parameters. There is
passivity or causality enforcement as well as intra and extrapolation if the
frequency points not align with the points given by the S-parameters. For a 1:1
comparison you should use identical frequency steps in simulation and all the
S-Parameter files and switch off all enforcements. Then both tools should give
the same S-parameter result.
If you also convert to time domain, then the differences can be significant
based on the windowing function used by the tool.
Mit freundlichen Grüßen / Kind regards.
Gert Havermann
Signal Integrity Engineer
Dept.: Corporate Technology Services
HARTING Stiftung & Co. KG
Marienwerderstraße 3
D-32339 Espelkamp
Phone +49 (0)5772 47 857
Fax +49 (0)5772 47 90857
mailto:gert.havermann@xxxxxxxxxxx
http://www.HARTING.com
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-----Ursprüngliche Nachricht-----
Von: si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> Im Auftrag von
Tramp
Gesendet: Donnerstag, 11. Juli 2019 06:03
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] extract the channel sparam using Matlab
Hi experts,
I found that using Matlab RF toolbox cascadesparams, the channel sparam
obtained is slightly different from that obtained with a commercial channel
simulator. Also, different freq points give different sparams. Any comments on
extracting the channel sparam using Matlab?
--
Best Regards,
Tramp
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