Patent ID: 8901999

Claim:
An audio-output amplifier circuit for an audio device including a pop reduction circuit to generate a variable reference voltage, comprising: an output amplifier, the pop reduction circuit being provided in a previous stage of the output amplifier, to provide the variable reference voltage to an input of the output amplifier; and a switching element connected between an amplifier-output terminal of the output amplifier and ground, to short-circuit the amplifier-output terminal of the output amplifier after transition to ground-level voltage is finished, wherein an audio control signal is supplied to the output amplifier and to the switching element to turn off the output amplifier and concurrently turn on the switching element to short-circuit the amplifier-output terminal of the output amplifier, and wherein the variable reference voltage provided by the pop reduction circuit to the input of the output amplifier is decreased immediately before the output amplifier is turned off and the switching element is turned on.