| 摘要 |
A multi-input operational amplifier circuit is provided to suppress the increase of chip area by generating different constant current source while having the same transistor size. A plurality of differential amplification circuits(40-1 - 40-3) is composed of a constant-current source, a first input transistor, and a second input transistor. The constant-current source is connected between the first power source node and a common node, receives an aggravated predetermined bias voltage, and supplies the constant current produced based on the bias voltage to the common node. The first input transistor is connected between the common node and the first output node, and receives one of a plurality of input voltages, and is controlled by it. The second input transistor is connected between the common node and the second output node, and receives the output voltage, and is controlled by the output voltage. A power transistor is connected between the second power node and output terminal and is controlled by a control voltage.
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