[SI-LIST] Re: SMA cable for TDR

Hi Perry,

Just a quick note, since it seems like delay matching was in your list, you
can deskew the TDR pulses in the TDR, effectively matching them to the ref pt
at the end of the cables. This allows you to pass on the 1-ps* matching cost
adder. *Only an example number as I have order ps matching in both Gore and
S&H in the past.


Jim Antonellis
Principal SI Engineer
Broadcom Corporation

janton@xxxxxxxxxxxx
www.broadcom.com

Office: 978.689.1669
Cell: 978.618.4745

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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On 
Behalf Of QU Perry
Sent: Tuesday, October 28, 2008 5:16 PM
To: steve weir; Zabinski, Patrick; Mark Randol; Chris Cheng
Cc: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: SMA cable for TDR

Thanks everyone for the suggestions on/off list. I had quite a few leads
to pursue.

I'm not looking for super high bandwidth cable, but it needs to be
better than the cheap blue semi-rigid cable I'm using now. It's a pain
to try to find some matching cables (I have seen some terrible mismatch
in delay and attenuation  even though they all measured 3 feet). I'm
also concerned about bend radius and the impact on measurement
consistency.

Steve/Chris: I did search for Gore cable on Ebay and there are some nice
cables out there, just did not find anything that suit my needs. :)

Pat: agree that good quality cable is important together with good
calibration practice for model extraction purpose. I have seen the
impact of these factors on my measurement results.

Mark: thanks for the 3.5mm suggestions. That's also recommended by Gore
engineer. 

Regards

Perry

======================================= 

Perry Qu 

Design & Qualification, Alcatel-Lucent Canada Inc.

600 March Road, Ottawa ON, K2K 2E6, Canada 

DID: 613-7846720  Fax: 613-5993642 

Email: perry.qu@xxxxxxxxxxxxxxxxxx 

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