Akhil,
Generally yes you gotta pay to play, but Octave handles complex numbers like
S-parameters (http://rf.helpingcreate.com/cgi-bin/octave.pl?page_name=examples ;
<http://rf.helpingcreate.com/cgi-bin/octave.pl?page_name=examples>). Anyone
know if QUCS can handle S-parameters? Also check PyBert.
In the past, when I had a small one man SI consulting company and I was poor I
got a copy of WinCal XI from Cascade Microtech and used that, it worked great
(years ago though).
Excel is a horrible with complex numbers, IMHO.
Another low cost option is Matlab with RF toolbox if you dont want to use
Octave. That package is only slightly less than Simbeor, so has no 3D EM
capability.
- Al
On Apr 23, 2018, at 7:38 AM, Akhil paul <akhil.paul@xxxxxxxx> wrote:
Hi AI,
To take impedance data form S parameters do we required paid software??
Akhil
From: Havermann, Gert <mailto:Gert.Havermann@xxxxxxxxxxx>
Sent: 23 April 2018 07:42 PM
To: Alfred P. Neves <mailto:al@xxxxxxxxxxxxxxxxx>
Cc: si-list <mailto:si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Re: PSNEXT , PSFEXT
Hi Al,
I'm using ADS and Origin Lab for these calculations and use those for further
analysis too. I do examine the raw s-parameters for quality check, I look at
the data in both domains and make several different plots of impedance,
single aggressors, ICR, ICN, IL, RL, Group Delay, Mode conversion, Cannel
Simulation, Bathtub curves and other helpful simulations to not only get a
pass fail, but also find out what the bad contributors are and be able to
optimize the system.
But non of that was part of the initial question, and my answer was only
related to calculating PSNEXT and PSFEXT from S-Parameters.
BR
Gert
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-----Original Message-----
From: Alfred P. Neves <al@xxxxxxxxxxxxxxxxx>
Sent: Monday, April 23, 2018 3:43 PM
To: Havermann, Gert <Gert.Havermann@xxxxxxxxxxx>
Cc: si-list <si-list@xxxxxxxxxxxxx>
Subject: Re: [SI-LIST] Re: PSNEXT , PSFEXT
Gert,
I agree that the Excel spreadsheets can be used to calculate PSFEXT and
PSNEXT, and WRT uses those spreadsheets when the there is a partial
S-parameter description of the system.
What is your methodology, only armed with Excel, to datamine the S-parameters
in the time domain and analyze marginal of failed compliance? We add the
impedance profile to the report using either Simbeor or ADS which helps in
understanding the data.
- Al
On Apr 23, 2018, at 1:05 AM, Havermann, Gert <Gert.Havermann@xxxxxxxxxxx>
wrote:
Hi Roopesh,
the IEEE802.3 spec has all the formulas to calculate PSNEXT and PSFEXT.
This can be done in Excel or other calculation tools WITHOUT any error.
It's simple math, just the quality of the S-Parameters does make a
difference in the end, not the calculation.
Like Akhil said, it is important to convert to mixed mode first. The you
need to define the victim and aggressors. NEXT aggressors are TX-Ports
adjacent to the victims RX-Port. FEXT are the TX-Pots adjacent to the
victims TX Port.
Best Regards
Gert
----------------------------------------
HARTING Stiftung & Co. KG | Postfach 11 33, 32325 Espelkamp |
www.HARTING.com Persönlich haftende Gesellschafterin:
HARTING Führungsstiftung | Amtsgericht München | HRA 108479 | München
Vorstand: Dipl.-Kfm. Philip F. W. Harting (Vorsitzender), Dipl.-Kffr.
Maresa W. M. Harting-Hertz, Dipl.-Kfm. Dr.-Ing. E. h. Dietmar Harting,
Dipl.-Hdl. Margrit Harting, Dr. rer. nat. Frank Brode, Dipl.-Ing. (FH)
Dipl.-Wirtsch.-Ing. (FH) Andreas Conrad, Dr. iur. Michael Pütz Sitz
der Gesellschaft: Espelkamp | Amtsgericht Bad Oeynhausen | HRA 9021 |
UST-ld Nr. DE812136745
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx <si-list-bounce@xxxxxxxxxxxxx> On
Behalf Of Akhil paul
Sent: Saturday, April 21, 2018 7:27 PM
To: roopesh.badala@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PSNEXT , PSFEXT
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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