| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an operational amplifier in which the flatness of mutual conductance is improved in a wide common-mode input voltage range. Ž<P>SOLUTION: The operational amplifier includes: a differential input circuit provided with first and second differential pairs and supplied with a first power supply voltage and a second power supply voltage lower than the first power supply voltage; and a control circuit capable of detecting that an FET configuring the first differential pair is operated in the case that a common-mode input voltage between the first power supply voltage and the second power supply voltage is inputted to the first and second differential pairs respectively, and adjusting the operation of an FET configuring the second differential pair so as to keep the mutual conductance of the differential input circuit at a roughly fixed value. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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