Re: gEDA-user: Mixed signal plane tie-in

[gene <carzrgr8@xxxxxxxxxxxxx>]

I like to use only a single ground plane for everything.  Use moats and 
thoughtful component placement to isolate the analog/digital and 
high/low level signals - pretty much what Eric said.

gene
> That's a $64,000 question. Both ways will work if handled carefully, and 
> which one you use depends on your previous experience and the design 
> requirements.
>
> Analog Devices has a pretty good tutorial on this:
>
> http://www.analog.com/en/content/0,2886,761%255F795%255F97529%255F0,00.html
>
> and some of their mixed-signal MCU datasheets also go into further 
> detail on the subject. I've read a lot of different opinions on the 
> topic and the one thing they all seem to have in common is that you want 
> to keep the ground return current paths for the analog and digital 
> circuitry separate. If you can do this by careful placement with a 
> single ground plane then that will work. Just make sure 'not to cross 
> the streams' to paraphrase "Ghostbusters".
>
> Eric
>
>
>   



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