[SI-LIST] Re: Caps between "isolated grounds"?
- From: Krunal Desai <movax@xxxxxxxxx>
- To: dmarc-noreply@xxxxxxxxxxxxx
- Date: Mon, 14 Nov 2016 14:22:24 -0800
On Mon, Nov 14, 2016 at 2:00 PM, Loyer, Jeff
<dmarc-noreply@xxxxxxxxxxxxx> 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.
At a high-level / basic circuit theory understanding, it sounds like
someone wanted those different "grounds" to only be shorted together
at higher frequencies of interest, and block DC otherwise. Of course,
it is not that simple in practice.
KD
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