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 > > > _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
