| 摘要 |
PROBLEM TO BE SOLVED: To enable a plurality of signals of channels to be amplified, to reduce a substrate packaging area and a cost, and to enable the problem of the generation of heat to be cleared. SOLUTION: An amplifier circuit includes an input selector 20 which changes signals of two channels of Ach, Bch in a time sharing manner and outputs them, a class D amplifier which amplifies a signal outputted from the input selector 20 (a PWM circuit 21, an oscillator 22, and a reference voltage current block 23), and an output selector 24 which changes an output signal from the class D amplifier substantially synchronizing with the timing of switching in the input selector 20 in a time sharing manner, and outputs it. COPYRIGHT: (C)2006,JPO&NCIPI
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