Thanks for the nice feedback.
Aha! You have asked an EMI question! I use the ground plane in a backplane
as one side of my Faraday cage. Where that backplane meets the flanges on
the card cage, I leave the copper on the top layer and connect that with
vias to the ground plane in the backplane. Now, there is the one connection
between logic ground and the Faraday cage. There can be no other
connections such as on face places if one is to avoid "leaking" at the
cracks which is a common complaint when more than one connection is made
between logic ground and the Faraday cage. Notice, I did not use the phrase
"chassis ground" in this discussion.
I have used this method in dozens of systems with very good EMI results.
Hope this helps.
Lee
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Boris Bakshan
Sent: Saturday, January 7, 2017 5:24 AM
To: Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
Cc: si-list <si-list@xxxxxxxxxxxxx>
Subject: [SI-LIST] Re: An Article on what ground is
Hi Lee,
Very good, comprehensive article, thank you.
What is your recommendation when it comes to backplanes? a backplane is
attached to the chassis with bolts/other conductive mechanical parts. Do you
recommend plating these PCB holes in the backplane? If you do, should these
holes be connected to (any) electrical net?
Thanks Lee.
On Fri, Jan 6, 2017 at 10:43 PM, Lee Ritchey <leeritchey@xxxxxxxxxxxxx>
wrote:
I have written an article on ground following the brisk exchange on
this subject last month. I hope it clears up some of the confusion
around this subject.
Here is where it is on the web.
http://ubm.io/2ikEDat
Lee Ritchey
Speeding Edge
P.O. Box 2194
Glen Ellen, CA
95442
707-568-3983
I just used the energy it takes
To get mad and wrote some blues.
Count Basie
Or:
Worry is like a rocking chair,
It keeps you busy but.
It doesn't get you anywhere.
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