[SI-LIST] Re: de-embedding fixture
- From: "Al Neves" <al@xxxxxxxxxxxxxxxxx>
- To: "'Kevin Li'" <swagguy10@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 16 Sep 2011 07:36:54 -0700
Kevin,
Your options are to calibrate out the differential symmetric fixture using
Unknown THRU (also called SOLR I believe), Automatic Fixture Removal (AFR,
Agilent specific released this last year, discussed in Tutorial by Mike
Resso, Eric Bogatin in Test/Measurement track DesignCon) TRL/LRM calibration
(version depends on coupling, whether it is multi mode or not), and T-matrix
de-embedding.
Tektronix has a patented Symmetrical, but I don't think it is commercially
available. Also, I don't know where this stands but Ultimetrix had a cal
they were promoting some time back.
On all of the calibration approaches we are using Simbeor2012 to analyze
passivity/causality issues also of the final DUT data.
Data/Memory on the Agilent platform only algebraically operates on one
value, doesn't de-embed or calibrate out fixture for full S-parameter
description of the fixture.
We have data for one of our Channel Modeling Platforms that I can share with
you offline if that will help.
Products for the Signal Integrity Practitioner
Wild River Technology LLC
Alfred P. Neves
Founder - Engineer - Business Development
(503) 718 7172 Office
(503) 679 2429 Mobile
735 South East 16th Ave.
Hillsboro, OR 97123
www.wildrivertech.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Kevin Li
Sent: Thursday, September 15, 2011 12:12 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] de-embedding fixture
Hi, experts,
I was doing differential measurement on VNA and trying to de-embed fixtures.
I saved SDD21 data of the fixture in "memory" and tested the DUT cascading
with the fixture and saved that as "Data". By clicking "Data/Memory" I could
get the SDD21 for the DUT only.
I guess de-embedding SDD11 and SCD21 could not be done by similar method.
What do you guys think? I would be glad to know whether we can de-embed
SDD11 and SCD21 without PLTS.
Thanks.
Kevin
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