[SI-LIST] Re: Ground stitching vias for EMI control
- From: Todd Hubing <HUBING@xxxxxxxxxxx>
- To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Tue, 9 Apr 2013 21:13:51 +0000
Balaji,
That's one of the rules of thumb in my EMC Design Guidelines
Collection<http://www.learnemc.com/tutorials/guidelines.html>. It's the third
guideline in the category "Not-So-Good EMC Design Guidelines". Via stitching is
not necessarily a bad idea; however if you are designing 10 Gps boards, my
advice would be not to rely too heavily on design guidelines.
Todd
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Balaji G
Sent: Tuesday, April 09, 2013 1:47 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Ground stitching vias for EMI control
Hi all,
I recently came across a thumb rule in a book for Faraday shield or Ground
Fencing to control the stray EMI generated in the board is 'Ground vias must be
stitched at a distance lambda/20 '. I guess the book was written some 5 years
ago. Now, Is this rule still valid for present 5Gps, 10Gbps designs having high
speed signals in Microstrip? If simulation is the only way for validating the
use of ground stitch via shielding in high speed design, I would be happy to
know if there is any tool.
Regards,
Balaji
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