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

  • From: <Aubrey_Sparkman@xxxxxxxx>
  • To: <zhenggang.cheng@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
  • Date: Thu, 30 Aug 2007 15:05:54 -0500

Here's a thought:  Even if you use a TDR, do you really think you can
tell exactly what the topology is, if it's in a box and you can't see
it?=20


Aubrey Sparkman=20
Enterprise Engineering Signal Integrity Team
Dell, Inc.=20
Aubrey_Sparkman@xxxxxxxx=20
(512) 723-3592

"The ultimate measure of a man is not where he stands in moments of
comfort and convenience, but where he stands at times of challenge and
controversy." - Martin Luther King, Jr.

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of ZHENGGANG CHENG
Sent: Thursday, August 30, 2007 2:30 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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