Quote:It's called an ADC and some digital logic.
I agree with you but I'm trying to do a self calibrated analog circuit.
However, these circuits are different from the Gilbert cell and very interesting.
Quote:Best I can think of for voltage will get you Vref^2*(1/Vodp + 1/Vodn) by using two Vref/R currents and one (Vodn+Vodp)/R currrent.
I think this is not correct, the result is proportional to 1/(Vodp+Vodn) and not to (1/Vodp + 1/Vodn). Am I wrong?
I will try to extract the two overdrive voltages using a diode connected MOS cascaded with a source follower, this is possible only if the overdrive voltage isn't too low.