[SI-LIST] Re: TDR S-parameter and correlation

ZG

A TDR plot messaged by Tek's IConnect can give you a model of the =
circuit
under test that will model features down to the resolution capabilities =
of
the edge you have launched into the DUT.  A VNA can also give you a TDR =
like
plot of features vs. time.  Many VNAs have this capability within the =
unit
either as a option or a standard feature. There are S Parameter plotting
programs that will produce a TDR like plot based on S11.  I use SPViewII
from Ark RF Systems.

Tom Dagostino
Teraspeed(R) Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
tom@xxxxxxxxxxxxx=20
www.teraspeed.com=20

Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of ZHENGGANG CHENG
Sent: Thursday, August 30, 2007 12:30 PM
To: si-list
Subject: [SI-LIST] TDR S-parameter and correlation


Hi,
My question is:

If we TDR  (assuming the TDR method is 100% correct) the equivalent =
circuit
converted using S-parameter, will the result is exactly the same as real =
TDR
of the same DUT? (assume the converting error and bandwidth are not =
issues)
Assume this DUT has many large discontinuities inside.

To me, the real TDR can distinguish all the discontinuities inside a =
DUT;
however, the S-parameter is only the characterization at the ports =
rather
than inside. Will two equivalent circuits give the same S-parameter but =
have
two different topologies?

Look froward to your replies.

Thanks,

ZG


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