[SI-LIST] Re: Question about split gnd planes - a history
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sat, 27 May 2006 10:45:14 -0400
> A solution ofen used to couple split planes that is almost always
> suggested is to connect the planes with an isolating capacitor. It may
> come as a surprise to most of you that "apple" has a patent on that
> solution. I know it surprised me.
I wonder how much prior art exists of people already doing that before
Apple's patent (got a date/patent no.?).
I've seen plenty of IC application notes, years back, that suggested if not
required separate analog and digital grounds. I've wondered if much of the
reason for that has more to do with IC design (and the impossibility of
having quiet on-die references in a DIP package), than with system/board
design issues.
Andy
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