| 摘要 |
An audio power amplifier includes a differential amplifier circuit that serves as an input circuit. The differential amplifier circuit includes a signal ground terminal that receives a signal ground voltage, and an audio signal input terminal that receives an audio signal. A signal ground voltage generation circuit is provided to output the signal ground voltage. The signal ground voltage generation circuit includes a voltage follower amplifier that outputs a current, a reference voltage source that is input to the voltage follower amplifier, and a current control circuit that controls the current output from the voltage follower amplifier. The signal ground voltage rises in a prescribed manner while suppressing a pop sound during its transition.
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