FreeLists / si-list / [SI-LIST] risetime effects of plane breaks

[Doug Smith <doug@xxxxxxxxxx>]

I think most of us know not to route signals over plane breaks on PWBs 
as all kinds of bad things can happen when this occurs in a layout. 
But, how do you convince co-workers or your boss that a new design 
needs to avoid doing this even if added expense or project delay is 
required? Experimental data can be the key and this month my Technical 
Tidbit shows what happens to signal risetime if the signal crosses a 
plane break.

Crossing Ground Plane Breaks - Part 4
Risetime Effects on Signals

Abstract: Signals that cross ground plane breaks on printed wiring 
boards (PWBs) experience degradation as well as cause EMI problems. 
Significant degradation of signal risetime is shown to occur, even 
with a relatively small ground break of five cm at risetimes on the 
order of 300 ps.

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
      \          / )      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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