Abstract

With the popularity of portable electronic products,class-D audio amplifier is favored by the market because of the advantages of high efficiency,small volume. This paper designed classic a high efficiency class-D audio power amplifier.The system is mainly composed of pre amplifier circuit,band pass filter circuit,PMW modulation circuit,driving circuit,power amplifying circuit and low pass filter circuit. The system has high performance and the efficiency is up to 90%.

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