Jim Thompson wrote:

Diode D7 prevents some really weird behavior from back conduction. If
there were a need to tighten up the efficiency, I'd replace it with
another P-channel, body in the opposite direction from MP1 (for lack
of finding a suitable transistor, modeled as a 0.3 Ohm device
extrapolated from my vast CMOS device library :-). Then I'd use a
comparator to make the drop like a near ideal diode as in...

http://analog-innovations.com/SED/Pe...rIsolation.pdf

Can a comparator really sense up to it's positive supply? Surely not all of
them.

And wouldn't it depend on which side of the 'diode' it is powered from?


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