[Richard Crowley]

"Kevin McMurtrie" wrote ...
I figured out where my copy of "The Art of Electronics" was hiding.
"Driven guard" or "bootstrapped guard" is it.

It's funny that a patent can be granted for the application of that to
silicon wafers sensors.

Well, of course, *I* think it is a valid application of patent protection.
:-)
OTOH, there is the claim that someone successfully obtained a patent
on a ham sandwich (appropriately disguised in legaleese.)