| 摘要 |
The invention provides an operation amplification circuit and the like that can reduce current consumption, is not dependent on the power supply voltage, and can suppress mass-production variations. The present invention is equipped with a bias circuit, a differential amplification circuit and an output amplification circuit. The bias circuit 11 includes a reference voltage circuit and a current mirror circuit. The reference voltage circuit includes a depletion type PMOS transistor and an enhancement type PMOS transistor serially connected to each other. The MOS transistor has a gate electrode that is formed from polysilicon including a P-type impurity, and the MOS transistor has a gate electrode that is formed from polysilicon including an N-type impurity. Furthermore, a voltage corresponding to a difference between threshold voltages of the MOS transistors is generated at a commonly connected section of the MOS transistors as a reference voltage.
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