[SI-LIST] Re: Splitting this power plane.

I should have mentioned, there is ground flood on all unused areas of 
all signal and component layers, to help make up for there being only 
one ground plane.
Ivor

on 3/11/2005 9:46 AM Ivor Bowden wrote:

>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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