| 摘要 |
Even when an input is small in a current supply capacity, a differential amplifier circuit capable of outputting a high accurate voltage with an offset corrected can be obtained. In the differential amplifier having first and second input terminals and an output terminal, a control is made for switching between a first state wherein a first input terminal is taken as a non-inverting input terminal, and a second input terminal is taken as an inverting input terminal, and a second state wherein the first input terminal is taken as an inverting input terminal and the second input terminal is taken as a non-inverting input terminal, and further, a capacity element, one end of which is connected to a predetermine power source terminal, is provided, and moreover, a control is made such that the first input terminal is supplied with an input voltage, and the other end of the capacity is connected to the second input terminal and output terminal in the first state, and the first input terminal is connected to the output terminal, and the other end of the capacity is connected to the second input terminal in the second state. In this way, an offset detecting operation is performed in the first state, and an offset correcting operation is performed in the second state without the input voltage connected to the capacity.
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