The point of this guys was that the signal did not matter. The case in point is the output of eddy current sensor electronics where the change in phase/amplitude is demodulated to a DC voltage. This DC voltage varies non-linearly with the change in phase/amplitude of the bridge to the distance...
logbook--As far as I know, the only active component is the opamp. Again, I'm only going by what he said.
The only other clue I have is from plotting the non-linearity versus distance. Normal curve shape is the classic 'S' curve. After his circuit, that 'S' curved looked like it had been...
A couple of months ago, some guy with his own company approached my company with a circuit that consisted (he said) of 7 components (one op-amp, resistors and caps) that could improve linearization. We never got to see the circuit (He believed he could get rich on this...my company didn't...
