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

About this list Date view Thread view Subject view Author view

From: Ritchey Lee (leeritchey@earthlink.net)
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

MikonCons@aol.com 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
>
> *** Serving Your Needs with Technical Excellence ***
>
> **** To unsubscribe from si-list or si-list-digest: send e-mail to
> majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
> si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
> si-list archives are accessible at http://www.qsl.net/wb6tpu
> ****

**** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE
si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Wed Nov 22 2000 - 10:50:19 PST