OPERATIONAL AMPLIFIER, MOTOR DRIVE DEVICE, MAGNETIC DISK STORAGE DEVICE, AND ELECTRONIC APPLIANCE

摘要

An operational amplifier has an input stage which generates a first input current and a second input current in accordance with a first input signal and a second input signal, an offset adjuster which gives offsets to the first input current and the second input current respectively to generate a first output current and a second output current, an output stage which generates an output signal in accordance with the first output current and the second output current, and an offset current generator which generates a first offset current and a second offset current in accordance with an offset adjustment signal. The offset adjuster gives the offsets to the first input current and the second input current respectively by using the first offset current and the second offset current.

主权项

1. An operational amplifier comprising:
an input stage which generates a first input current and a second input current in accordance with a first input signal and a second input signal; an offset adjuster which gives offsets to the first input current and the second input current respectively to generate a first output current and a second output current; an output stage which generates an output signal in accordance with the first output current and the second output current; and an offset current generator which generates a first offset current and a second offset current in accordance with an offset adjustment signal, wherein the offset adjuster gives the offsets to the first input current and the second input current respectively by using the first offset current and the second offset current.