[SI-LIST] active probe issues

Hi All,

If you use active probes to measure today's high speed signals, there 
are significant design assumptions from one probe to another and 
different probes can give significantly different results on the same 
signal. Understanding the differences is essential to avoid time 
wasting lab mistakes.

My Technical Tidbit on this subject is posted at http://emcesd.com 
with the link being the diagram at the bottom of the home page.

Abstract: As circuits have become faster, active scope probes have 
become more sophisticated in order to measure today's very high speed 
signals. At the same time, probe loading of measured signals has 
become more of an issue. The question of whether to display the signal 
at the probe tip or to estimate what the signal was without the probe 
is an important one that designers must take into account. 
Implications of this choice are discussed.

I have also included an in-depth audio-visual tutorial dealing with 
this topic on my subscription site, linked in the article (broadband 
connection and subscription needed).

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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