Occasionally some people use a capacitor between different grounds in a
misguided attempt to provide to provide a signal return path under a
trace that crosses over the plane split for signal integrity purposes.
This, of course, is usually a bad idea. The purpose for separate
"grounds" in the first place was to isolate noise. All the capacitor
does is ensure the noise has a path between the two grounds.
(Note to Jeff: Please send me a current email address off-line.)
Doug
Loyer, Jeff wrote:
I was looking at some designs and found different ground symbols connected by
capacitors. Can anyone explain why this might be done? Everything I've seen
or heard says this is a bad thing (I would connect them directly), but I want
to be sure I'm not missing something. I think there are some A/D devices
which have specific guidelines for separating digital and analog grounds, but
I don't think they'd be connected by caps.
Thanks,
Jeff Loyer
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