| 摘要 |
A differential amplifier circuit includes a differential operational amplifier that includes a differential pair circuit and operates based on a constant bias current supplied from a bias current source circuit, and the differential amplifier circuit includes a bias current generator circuit. A current monitor circuit detects two currents flowing through the differential pair circuit in correspondence with differential input voltages inputted to the differential pair circuit, and detect a minimum current of the two currents for a difference voltage of the differential input voltages as a monitored current. A current comparator circuit compares the monitored current with the constant bias current. A current amplifier circuit amplifies a voltage corresponding to the comparison result, and controls currents flowing through the differential pair circuit based on an amplified voltage, and the bias current generator circuit performs negative feedback adaptive control such that the bias current increases as the monitored current decreases.
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