[SI-LIST] Design rule on immunity not effective

From: "Douglas C. Smith" <doug@xxxxxxxxxx>
To: si-list <si-list@xxxxxxxxxxxxx>
Date: Wed, 01 May 2002 11:29:27 -0700

Hi All,

I have been busy again setting up experiments and taking data on a
circuit board that indicates a design rule for ESD (or other sourses of
high frequency noise) that I have heard from many sources does not work.
I knew this was the case, but thought some data was in order.

This month, the Technical Tidbit at http://emcesd.com (or alternately
http://www.dsmith.org) investigates the effect of board connections to a
metal plane on its response to ESD. Scroll down to the bottom of the
index page to link to the article. This article builds on the results of
the April Technical Tidbit article where an oscillator was used as the
excitation of a board over a metal plane.

A circuit board from a disk drive was mounted near a metal plane and
measurements of currents in connections to the plane were taken when the
plane was excited by an ESD event. The results are dramatic and a major
design rule about grounding circuit boards for immunity is shown to be
ineffective.

This article shows in a different way from last month's article how
strong the coupling between a board and a nearby metal plane is.

Doug
-- 
-------------------------------------------------------
    ___          _       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] Design rule on immunity not effective

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