| 摘要 |
PROBLEM TO BE SOLVED: To suppress the production of a saturated output voltage by effectively utilizing a dynamic range even in the case of operation at a low power supply voltage. SOLUTION: A soft limiter circuit 20 and a fluctuation compensation circuit 30 are connected between an output terminal O1 and an inverting input terminal of an operational amplifier OP. The soft limiter circuit 20 includes diodes D1-D3, D4-D6 connected in antiparallel between the output terminal O1 and a node n2 of the operational amplifier OP and a resistor R5 connected between the node n2 and the inverting input terminal. The fluctuation compensation circuit 30 includes diodes D7-D9, D10-D12 connected in antiparallel between the output terminal O1 an a node n3 of the operational amplifier OP, a resistor R6 connected between the node n3 and the inverting input terminal, and a capacitor C3 connected between the node n3 and a ground potential point. |
