[SI-LIST] Re: PureMode VNA vs 4port VNA
- From: "Dima Smolyansky" <Dima.Smolyansky@xxxxxxxxxxxxxx>
- To: <ray.anderson@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 5 Apr 2005 09:49:56 -0700
Ray,
Pure mode VNA is not available, but pure mode TDNA is available with
IConnect S-parameters and Tektronix TDS/CSA8200 TDR scope. For linear
systems, however, "non-pure mode" VNA is as good as pure-mode. It is the
non-linearity that makes a difference.
Thanks,
===================
Dima Smolyansky
TDA Systems, Inc.
4000 Kruse Way Place
Bldg. 2, Suite 300
Lake Oswego, OR 97035
(503) 246-2272
(503) 246-2282 (fax)
IConnect(R) S-parameters version 3.5 is released!
Request your quote for IConnect S-parameters now! www.tdasystems.com
----- Original Message -----
From: "Ray Anderson" <ray.anderson@xxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Monday, April 04, 2005 1:23 PM
Subject: [SI-LIST] PureMode VNA vs 4port VNA
> Over the past year or so there has been a lot of discussion of
> mixed-mode s-parameters, why they are useful, conversion of single-ended
> to mixed mode, etc., etc....
>
> As I understand it, mixed-mode s-parameters can be mesasured with a true
> pure-mode VNA, with a 4-port VNA, or with a TDR (the last 2 methods
> requiring mathematical post-processing of the measured data to create
> mixed-mode s-parameter data). This post processing can occur either in
> the instrument (with appropriate firmware) or after the fact in a
> separate compute environment.
>
> Is it true that a true pure-mode VNA is still not available commercially
> from any of the test equipment vendors? I wonder if anyone knowledgable
> on the topic can comment in the practical differences a user should be
> aware of when utilizing a 4-port VNA to measure mixed mode s-parameters
> as opposed to the fabled pure-mode instrument.
>
> -Ray
>
> --
> Raymond Anderson
> Senior Signal Integrity Staff Engineer
> Product Technology Dept.
> Package Engineering Group
> Xilinx Inc.
>
>
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