From: Doug McKean ([email protected])
Date: Fri Jun 02 2000 - 11:24:58 PDT
What are the opinions of separating power and
ground planes with a signal layer?
Is it a *hard fast rule* that never shall they be separated?
Are there some caveats conditions that allow separation?
Assuming that everything except stackup remains the same,
is there some significant measurable difference with say
a digital board handling clocks around 40 MHz to 80 MHz
and bus speeds of say PCI, and fsb of 133 (maybe even 200)
and/or Ethernet with power and ground planes separated with
a signal layer as opposed to one that has them adjacent?
I've been of the opinion that power and ground planes should
NEVER be separated, but lately, I'm not so sure about that.
- Doug McKean
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