On Thu, Jul 22, 2010 at 12:37 PM, DJ Delorie wrote:
One idea to consider is to start with a solid plane, and cut slots around the sensitive analog parts, like big C shaped moats, squares open on one side. You retain the "big ground plane" conductivity, but you prevent stray currents from using your analog area as a short-cut. Each analog "chunk" can have it's own moat this way, too. If they're near the edge, just cut a thin slot from the edge in. Hmmm... this reminds me of the cubicle I used to work in :-P
Yeah, Dilbert calls them 'anti-productivity pods' :DSeriously though, I like your idea except that sloted planes are generally frowned upon in the SI world - there's an opportunity for eddy currents to flow around the slot, and that will radiate. As long as no signals cross the slots on any other layers, maybe
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