| 摘要 |
A CMOS operational amplification circuit is provided with a first differential amplifier having differential MOS transistors of one of P channel and N channel which receive an input signal; a second differential amplifier having differential MOS transistors of the other of P channel and N channel which receive the input signal; a current mirror circuit which receives respective current output signals of the first and second differential amplifiers and generates a current output signal depending on the current values of the respective current output signals; an output circuit which receives the output signal of the current mirror circuit and generates an output signal depending on the input signal; and a change-over circuit. The change-over circuit causes operation change-over which causes the first differential amplifier to perform operation, further causes the first differential amplifier to stop operation when the first differential amplifier is entering or has been entered into a dead zone operation region with respect to the input signal and causes the second differential amplifier to perform operation.
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