[SI-LIST] trace characteristic impedance

From: Doug Smith <doug@xxxxxxxxxx>
To: SI-List <si-list@xxxxxxxxxxxxx>
Date: Tue, 03 Feb 2004 23:06:02 -0800
Hi Everyone,

This month's Technical Tidbit on emcesd.com is the first one written 
by a guest author, Charles Grasso of Echostar Communications (a member 
of this group). The article describes a quick method of determining 
the characteristic impedance of a transmission line without a TDR.

Abstract: In a crunch, being able to adapt test equipment to get a 
close answer fast can be a life saver. The characteristic impedance of 
  a prototype circuit board was suspected as the cause of a 64 bit DDR 
SDRAM  bus failing initialization tests and a method to confirm the 
board design was needed urgently. This Technical Tidbit describes the 
method by which a network analyzer was pressed into service and its 
use outlined. This technique has been successfully used for analyzing 
other assemblies such as EIDE cables and USB unshielded twisted pairs.

The link to the article is a picture of a pwb coupon at the bottom of 
the page at http://emcesd.com

Also, the link below will take you to a UC Berkeley Extension page for 
a 2 day course in March I am presenting on design/troubleshooting 
techniques. (need a break from winter weather?) In addition to 
donating time to the EE department there, it is one of the ways I am 
helping to support the University.

http://www.unex.berkeley.edu/eng/elec/313544.html

Doug
-- 
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     ___          _       Doug Smith
      \          / )      P.O. Box 1457
       =========          Los Gatos, CA 95031-1457
    _ / \     / \ _       TEL/FAX: 408-356-4186/358-3799
  /  /\  \ ] /  /\  \     Mobile:  408-858-4528
|  q-----( )  |  o  |    Email:   doug@xxxxxxxxxx
  \ _ /    ]    \ _ /     Website: http://www.dsmith.org
-------------------------------------------------------

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[SI-LIST] trace characteristic impedance

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