Abstract
A conductance measurement circuit includes an operation amplifier, a bias current source, a compensation current source, and an output stage circuit. In the operation amplifier, a first input end receives a reference voltage, a second input end is coupled to a tested object, and an output end generates a compensation voltage. The bias current source provides a bias current to a bias end. The compensation current source derives the compensation current from the bias end according to the compensation voltage. The output stage circuit provides a trans-conductance value and an output end equivalent resistance, generates an output current according to the compensation voltage, and generates an output signal according to the output current and the trans-conductance value.