[SI-LIST] Splitting this power plane.
- From: Ivor Bowden <ivor@xxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Fri, 11 Mar 2005 09:46:21 -0800
Hi SI Gurus,
I am working on a 10 layer board, stackup is:
1 component/signal
2 ground
3 signal
4 power
5 signal
6 signal
7 power
8 signal
9 power
10 component/signal
The technology is mixed, mostly 1 to 3 V logic levels plus some LVDS and
a little analog.
The power layers are all fairly well bypassed, across the board.
There are also a number of local power planes embedded in the signal planes.
The issue is, one local power net, with relatively heavy supply
requirements, is currently implemented with 3 plane areas on 3 separate
signal layers, stitched together with vias. I am thinking it would be
better to split the power plane on layer 9 to give this supply its own
dedicated plane area, as layer 9 does not deliver in that area. The
concern is signals crossing the plane split, but since there are no
signals on layer 10 in that area, and layer 7 is a well bypassed power
plane, it shouldn't hurt to split layer 9?
I know each design is unique and requires its own proper study, but if
anyone would share their general impressions of this scenario, I would
appreciate it!
Thanks,
Ivor Bowden
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