If you have a full S-parameter description of the system (not just NEXT and
FEXT forward differential paths) the simplest solution is to use Simbeor.
For systems with partial S-parameter descriptions (you are only measuring FEXT
and NEXT of each aggressor/victim pair) we use a combination of Simbeor and
spreadsheets developed by Jim Bell for our backplane compliance service
business for almost all compliance specifications. Excel handles complex
numbers, like S-parameters, very poorly, so we only use it for the scalar
additions of PNEXT and PFEXT. IL, ILD, ICR is done in Simbeor.
A crux of the compliance measurements (IL, RL, ILD, etc.,) is making the
measurements at one or more de-embedded reference locations. The GMS
material id approach to de-embedding works so well for us based not on our last
project. Our engineers juxtaposed the 2X THRU with the left and right
de-embedded S-parameters and the match was virtually perfect. And since the
method is material modeled based and not measurement - algorithmic bifurcated
based we have much better de-embedded S-parameter quality.
Another advantage of this approach is we meld the S-parameter quality process
into the process. Secondly, when we max out the sample size of the VNA we
often resample things a bit using RCM in Simbeor, which also adds DC point so
customers can do direct time domain simulations with integrity.
Let me know off line how we can help further.
- Al
On Apr 21, 2018, at 10:27 AM, Akhil paul <akhil.paul@xxxxxxxx> wrote:
Hi Roopesh ,
You can use excel to plot the signal. Convert the snp file to mixed mode
using the mixed mode matrix calculation from the book â Advanced Microwave
Circuits and Systemsâ by Vitaliy Zhurbenko, take one port(which port you
want find the PSNEXT ) common for all calculation , from the calculation you
can find NEXT . Then add the NEXT signals and convert to dB. The same
procedure you can use for FEXT calculation.
Regards
Akhil
From: Roopesh Badala
Sent: 20 April 2018 11:09 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] PSNEXT , PSFEXT
Hi Experts,
I have a 16 port sparameter model .snp file which is that of '4-diff pairs
in parallel'
Can anyone please suggest how to plot PSNEXT & PSFEXT ?
Is there any simulation tool which has this option ?
Thank you
Roopesh
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