[SI-LIST] Re: TDR S-parameter and correlation
- From: "Tom Dagostino" <tom@xxxxxxxxxxxxx>
- To: <zhenggang.cheng@xxxxxxxxx>, "'si-list'" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 30 Aug 2007 13:09:43 -0700
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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