Re: [SI-LIST] : Comments from your SI seminar (SendII)`

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From: Ron Miller (rmiller@Brocade.COM)
Date: Wed Oct 27 1999 - 13:51:30 PDT

> I hope everyone goes to the seminar, because I will be the only person left

in this field that understands what is really happening.

Ron Miller

> In regards to comment 1. In a high frequency signalling environment, The
> return current will flow on the nearest plane whether it is power or ground.
> If you have two planes coupled closely togther you create a capacitor which
> the high frequency return current uses to traverse the planes and takes the
> path of least impedance.
> If there were not two planes coupled together, it would be an EMI
> catastrophe and you would not know where the return current is flowing.
> Regarding comment 2, he was stating that grounding in multiple locations is
> a bad idea. This can create some ground loops within the chassis. There
> will be some type of potential difference from one chassis connection point
> to another and this will create some current in the chassis. This is very
> bad from an EMI perspective.
> He believes one Solid connection to the ground plane is sufficient.
> I

Ronald B. Miller  _\\|//_  Signal Integrity Engineer
(408)487-8017    (' 0-0 ') fax(408)487-8017
Brocade Communications Systems, 1901 Guadalupe Parkway, San Jose, CA  95131,

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