| 摘要 |
PROBLEM TO BE SOLVED: To provide a class-D amplifier for amplifying an input signal in a status that deviation is small, and for obtaining an output signal in a proper level all over the whole dynamic range of an input signal. SOLUTION: An amplifier 100 outputs digital signals VOp and VOn pulse width-modulated according to an input signal. The input part of the amplifier 100 is provided with a switch 130 as an attenuation means. This switch 130 and a clip prevention control part 200 are configured to play a role as a gain control means for decreasing the whole gain of the amplifier 100 according to the increase of the level of the input signal VIp and VIn in order to maintain the peak level of a waveform shown by the digital signal VOp or VOn in a fixed level when the digital signal VOp or VOn is turned into a clip or its close status. COPYRIGHT: (C)2007,JPO&INPIT
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