| 摘要 |
An amplifier circuit has a voltage-amplifying stage, an output stage including a push-pull circuit comprising at least one complementary pair of output transistors, and a drive stage for driving the output transistors of the output stage in response to the output of the voltage-amplifying stage. The drive stage includes a subtraction unit and a signal-converting unit. The subtraction unit subtracts the output voltage of the voltage-amplifying stage, which is based on the first pole-potential of a power supply, from the reference voltage output by a reference voltage-generating unit also included in the drive stage. The subtraction unit outputs a voltage corresponding to the difference between the reference voltage and the output voltage of the voltage-amplifying stage, and supplies this voltage to the signal-converting unit. The signal-converting unit shifts the level of the input voltage, thereby producing a voltage signal based on the second pole-potential of the power supply. One of the output transitors is driven by the voltage signal, whereas the other output transistor is driven by the output voltage of the voltage-amplifying stage.
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