[SI-LIST] PureMode VNA vs 4port VNA
- From: Ray Anderson <ray.anderson@xxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 04 Apr 2005 13:23:05 -0700
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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