[SI-LIST] Re: power planes on adjacentlayers crossing each other
- From: "Cotton, Chris" <Chris.Cotton@xxxxxxxxxxx>
- To: "'ashok15687@xxxxxxxxx'" <ashok15687@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 10 Jul 2014 19:24:07 +0000
It depends on the requirements on your supply voltages and the frequencies you
are trying to run at. If L6 is a noisy 12V plane and L7 is a sensitive analog
plane then noise can couple and cause you issues. It also depends on the
proximity of the planes to each other (L6-L7) and to the nearest GND (L5-L6 or
L7-L8.) But for typical 3.3V supply requirements, what you describe is not
usually a problem.
Chris
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Ashok Srinivas
Sent: Thursday, July 10, 2014 3:13 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] power planes on adjacentlayers crossing each other
Hi SI-LIST,
We are using a 12 layer PCB stack up and have power planes on layer 6 and layer
7 (just to clarify layers 6 and 7 are not power planes completely but its more
like a power plane island). These power planes on layers 6 and 7 cross each
other.
I will use layer 5 to ground the layer 6 power plane and similarly use layer 8
to ground the layer 7 power plane.
Is this crossing a concern ?if yes why?
Thanks!
--
Ashok
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