[SI-LIST] Re: PCB impedance coupon measurement

 Yes, it can.
 First you need to make the trace in open condition at the end of the
trace then use 50ohm cable to probe to the trace.


Yours Sincerely.=20
Mandy_Tsai=20
High Tech Computer, Corp.=20
System Architecture Logic Design  / SI Team
TEL:+886-2-89124138  Ext: 8244=20
Fax:+886-2-89124136=20
E-mail : Mandy_Tsai@xxxxxxxxxx




-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Kenny Frohlich
Sent: Thursday, August 24, 2006 1:00 PM
To: geethukarrthik@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: PCB impedance coupon measurement

Hi all,
  Since we're on the subject of PCB impedance coupon measurement, I have
a question on TDR test.  I understand that TDR test is performed at the
impedance coupon on the PCB.  Can a TDR measurement be taken on an
actual trace on the PCB?  If a net is routed as a T-topology, can a TDR
measurement take on this net?
  =20
  Thanks,
  Kenny
Geetha Balasubramanian <geethukarrthik@xxxxxxxxx> wrote:
  Dear Members,
Generally what is the frequency range for PCB impedance coupon
measurement? Is it possible to measue the impedance of the coupon at a
specific discrete frequency?
For better accuracy is it necessary to have 2 seperate bands one for USB
full speed (12 Mbps) design and another for USB high speed (480 Mbps)
design?

Thanking you all in anticipation

Geetha



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