[SI-LIST] Re: reference plane
- From: Michael Nudelman <mnudelman@xxxxxxxxxxx>
- To: "'evillaf@xxxxxxxxx'" <evillaf@xxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Thu, 20 Jun 2002 14:04:27 -0400
Theoretically they are same. Practically one might think of the return
current paths having to jump de-coupling caps. For broadside-coupled
diffpairs using the GND-VCC planes' pair there is also coupling of VCC to
GND noise into the pair although this is practically common mode coupling.
VCC to VCC plane pair is pretty much the same as GND-GND.
I think "peace of mind" factor is also somewhat a player in the "GND only
ref plane" approach.
-----Original Message-----
From: evillaf@xxxxxxxxx [mailto:evillaf@xxxxxxxxx]
Sent: Thursday, June 20, 2002 1:36 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] reference plane
Can anyone explain the advantages and disadvantages of
using a power plane for a reference plane instead of a
ground plane? I have always used both as a DC reference
in the past. Now I am beginning to hear arguments that
only GND planes should be used for critical signals.
This becomes somewhat impractical for some boards.
Thanks in advance.
Ellis
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