FreeLists / si-list / [SI-LIST] more data on plane breaks

[Doug Smith <doug@xxxxxxxxxx>]

Hi All,

My Technical Tidbit this month discusses another effect of allowing
signals to cross plane breaks on printed wiring boards, generation of
common mode currents that cause emissions problems. The 5th and final 
article about plane breaks (for now anyway).

Abstract: Signals that cross ground/power plane breaks on printed
wiring boards (PWBs) can cause common mode currents on system cables
resulting in  excessive EMI emissions in addition to any signal
quality issues. Data is presented that shows significant emissions can
result from a small 5 cm plane break, even at frequencies of only tens
of megahertz.

The link to the article is the picture of the experimental test setup
at the bottom of the home page at http://emcesd.com .

Doug
-- 
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     ___          _       Doug Smith
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       =========          Los Gatos, CA 95031-1457
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  /  /\  \ ] /  /\  \     Mobile:  408-858-4528
|  q-----( )  |  o  |    Email:   doug@xxxxxxxxxx
  \ _ /    ]    \ _ /     Website: http://www.dsmith.org
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