| 摘要 |
An operational amplifier capable of supplying a large power approximate to a power supply voltage to a load resistance and of rendering the current consumption relative to the power supply voltage small when a signal is not issued. The operational amplifier comprises a first differential amplifying stage, a first amplifying stage, a first level shifting stage, a second differential amplifying stage, a second amplifying stage, a second level shifting stage, and outputting stage, a first phase compensation circuit and a second compensation circuit. The first differential amplifying stage differentially amplifies input signals while n-channel transistors serves as a differential amplifying elements. The second differential amplifying stage differentially amplifies input signals while p-channel transistors serves as a differential amplifying elements. The first amplifying stage amplifies an output of the first differential amplifying stage in opposite phase. The second amplifying stage amplifies an output of the second differential amplifying stage in opposite phase. The outputting stage comprising a p-channel transistor a source of which is connected to a first power supply voltage and an n-channel transistor a source of which is connected to a second power supply voltage for executing complementary operation in response to outputs of the first and second differential amplifying stages. The first level shifting stage level shifts an output of the first amplifying stage in the direction of the first power supply voltage to control a gate of the n-channel transistor of the outputting stage. The second level shifting stage level shifts an output of the second amplifying stage in the direction of the second power supply voltage to control a gate of the p-channel transistor of the outputting stage.
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