Re: [SI-LIST] : May 9th Presentation: "Radiation from Edge Effects in Printe...

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From: Ritchey Lee ([email protected])
Date: Mon May 15 2000 - 10:51:47 PDT

How does the "chassis" help control EMI? Isn't the Faraday cage the
vehicle for
EMI containment?

Lee

[email protected] wrote:

> Lawrence:
>
> A second note. Your suggested construction of placing a via-connected ground
> around the edge of the power plane is somewhat like rolling the open edge of
> a power/ground plane pair up to the surface. Because of the sharp turn
> radius, it is probably better than the simple open edge, and it would allow
> for the mounting of "spoiler" capacitors as well. The reason I prefer a
> separate set of rings with gaps (slots) that can be chassis connected (if a
> chassis is available) is for improved ESD protection. When left partially
> exposed (i.e., no soldermask over part of the outer trace), the outside rings
> offer a "sacrificial strike region" that can intercept potentially damaging
> strikes and carry the bulk of the associated current to a chassis structure
> without passing through the circuit portion of the PCB.
>
> Mike
>
> Michael L. Conn
> Owner/Principal Consultant
> Mikon Consulting
>
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