[SI-LIST] Re: Q on TDR coupon measurements
- From: "Ray Anderson" <ray.anderson@xxxxxxxxxx>
- To: <Charles.Grasso@xxxxxxxxxxxx>
- Date: Wed, 22 Mar 2006 10:11:09 -0800
Charles,
If this is the technique described in the IPC documentation if I
remember correctly the reason for looking only at the first portion of
the waveform was to minimize any perceived rise in impedance caused by
the resistive component on a long trace. I believe there was input from
some of the NIST staff in the development of this technique. (it was
quite a while back when I was asked to review the draft of the docs
prior to IPC publication so hopefully I am remembering this correctly).
As far as 'average-mean' goes I'm don't have an answer.
Regards,
-Ray
Raymond Anderson
Senior Signal Integrity Staff Engineer
Product Technology Department
Advanced Package R&D
Xilinx Inc.
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Grasso, Charles
Sent: Wednesday, March 22, 2006 9:55 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Q on TDR coupon measurements
Hi all,
=20
In researching the "state-of-the-art" for TDR measurement I ran across
an interesting measurement that I would welcome comments on from the
group.
After the coupon has been probed, the impedance is only measured over a
small portion (<25%) of the resultant waveform and then using
an "average mean* technique for reporting the impedance values.
=20
In the opinion of the group - is this a valid technique? What are the
reasons for only using a small portion of the waveform ? Does anyone
know what an *average mean* value is??
=20
Thanks in advance!!
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Pager/Short Message: 3032042974@xxxxxxxx
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx
=20
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