| 摘要 |
PROBLEM TO BE SOLVED: To provide an operational amplifier capable of continuously outputting an output signal by canceling an offset. SOLUTION: The operational amplifier is provided with a first operational amplifier circuit 11a and a second operational amplifier circuit 11b having the same electrical characteristic and outputs output voltage Vout obtained by amplifying input voltage Vin by one operational amplifier circuit performing a non cancellation operation while the other operational amplifier circuit performs a cancellation operation (holding operation and compensation operation) of offset voltage. In addition, both the operational amplifier circuits 11a and 11b are controlled so as to alternately perform a cancellation operation and a non cancellation operation. COPYRIGHT: (C)2007,JPO&INPIT
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