[SI-LIST] Re: power planes on adjacentlayers crossing each other
- From: "Orin Laney" <olaney@xxxxxxxxx>
- To: <ashok15687@xxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 10 Jul 2014 12:37:15 -0700
No, not a concern. This forum chats a lot about high speed signals crossing
plane splits, but the various power supplies are not high speed signals.
High Sometimes people worry about noise coupling through the small common
capacitance, but unless your needs are truly unusual, such coupling is so
small compared to the bypass capacitances that it is of no consequence.
Note that high speed signals outside of this portion of the stack up will
see only your ground planes and not be affected by the split power planes or
their overlapping portions.
Orin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Ashok Srinivas
Sent: Thursday, July 10, 2014 12:13 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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