[SI-LIST] Re: 20H rule explanation from W. Michael King
- From: Ray Anderson <Raymond.Anderson@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Mon, 8 Oct 2001 10:57:34 -0700 (PDT)
I don't want to add fuel to the 20H "rule" debate, but
just noticed this short paper from EPEP2000 on the web at:
http://www.sigrity.com/papers/epep2000/epep_20h.pdf
Paper is by Chen (of ucsc.edu) and Fang (of ucsc.edu and sigrity.com).
The conclusion states:
"This paper investigates the effects of 20-H rule and shielding vias on the
radiation from the printed circuit board. For the two-plane structure, 20-H
rule yields much more radiation than the normal structure. For the multiple
plane case, no significant change in radiation is found if the 20-H rule is
applied to the internal planes. Also the numerical result shows that the
usage of shielding vias would cut down the radiation effectively."
Kind of what I've suspected all along.....
-Ray
Sun Microsystems Inc.
>
>
>RJS,
>
>No, I'm pretty sure there's no good information in that
>explanation. It appears to be a parody of the type of
>nonsense that appears on this list from time to time.
>My guess is that it is a hoax of some kind.
>
>Mary
>
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