Re: [SI-LIST] : Split Plane

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From: Doug (dmckean@gte.net)
Date: Sat May 20 2000 - 12:38:15 PDT


Brad,

Not sure how much of a bind you're in and I don't
know if your configuration allows it, but I've done
something like -

Combined layers 6 and 7 into layer 6 (layout of the
board allowed that). Turn 7 into a ground plane.
Turn 8 into a signal plane.

Huge BUT here ...

In doing this, care should be taken.

1. The two adjacent power planes should have simple
   geometries - rectangle or square shape. No "arms"
   in them (traces off the power plane for sourcing
   or sinking power).
2. The power planes should be well separated.

If any of these get compromised, don't do it.
Should normally be avoided if possible. If there's
a simpler way, go with it.

Regards, Doug McKean

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