Doug,
I ran a quick plane-break simulation and have sent it to you in a word
document. It is interesting to see the reference plane current
distribution and to see how the EM radiation is affected.
Dave Cuthbert
Micron Technology
From: [email protected]
[mailto:[email protected]] On Behalf Of Doug Smith
Sent: Saturday, January 08, 2005 6:19 PM
To: emc-pstc
Subject: experimental data on PWB plane breaks
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
--
___ _ Doug Smith
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========= Los Gatos, CA 95031-1457
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