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Operational amplifier circuit, bandpass filter circuit, and infrared signal processing circuit

An operational amplifier circuit 5 of the present invention includes: a transconductance amplifier circuit 1 which converts a differential input voltage into a differential output current; a common-mode feedback circuit 2 which outputs a control signal to the transconductance amplifier circuit 1 so as to make a D.C. voltage level of a differential output voltage of the transconductance amplifier circuit 1 equal to a reference voltage vref; a voltage supply circuit 3 which supplies, as the reference voltage vref, a voltage which is hardly affected by a power source voltage to the common-mode feedback circuit 2; and an output load ZL to which the differential output voltage of transconductance amplifier circuit 1 is applied, and which constitutes an output terminal of the operational amplifier circuit 5. To each of the circuits, a power source voltage vdd is supplied from a power source terminal. With the operational amplifier circuit 5 having the above configuration, it is possible to realize an operational amplifier circuit whose power-source noise canceling characteristic is improved while its dynamic range is kept from decreasing.