| 摘要 |
PROBLEM TO BE SOLVED: To provide an operational amplifier by which suitable output characteristics of an OTA circuit can be obtained by generating a desired common mode voltage signal. SOLUTION: A voltage setting circuit 4 has a voltage setting area 11 for setting the maximum voltage level of amplitude of an outputted signal of the OTA circuit, a voltage setting area 12 for setting the minimum voltage level of the amplitude of the outputted signal and an intermediate voltage setting area 13 for setting intermediate voltage of the voltage set by the voltage setting areas 11 and 12. The intermediate voltage is inputted in a common mode feedback circuit and the common mode feedback circuit generates common mode voltage to feed back to the OTA circuit based on the intermediate voltage. COPYRIGHT: (C)2005,JPO&NCIPI
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