Patent ID: 8432223

Claim:
A differential amplifier circuit comprising: a power supply line connected to a power supply voltage source; an input part including an input circuit and an active load, the input circuit having two differential input elements, the active load having two transistors connected to the two differential input elements, respectively, the input part generating a differential signal in response to an input signal given to each of the two differential input elements; an amplifying part for generating an output voltage generating signal by amplifying the differential signal; an output part for generating an output voltage on the basis of the output voltage generating signal supplied from the amplifying part and a power supply voltage supplied from the power supply voltage source; and a noise permitting part connected between respective control terminals of the two transistors and the power supply line for permitting only a noise component of the power supply voltage to pass from the power supply line to the control terminals of the two transistors so as to drive the active load with the noise component.