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Reducing distortion of audio class D (PWM) power amplifier by using feed-forward techniques

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2 Author(s)
Shuanghe Zhu ; Inst. of Telecommun. Eng., Air Force Eng. Univ., Xi''an, China ; Caizhang Lin

The chief characteristics of an audio class D (PWM) power amplifier are higher efficiency and larger distortion that other amplifiers. This paper discusses the principle of reducing distortion for class D amplifiers by using a feed-forward error-null technique, and provides an experimental circuit. The theoretical analysis and experimental results show that the technique is effective in reducing the distortion of class D power amplifiers: the distortion has decreased from 1% to 0.1%, the output power of the amplifier is 10 watt, the efficiency is 90% and the prospect is good

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Circuits and Systems, 2000. IEEE APCCAS 2000. The 2000 IEEE Asia-Pacific Conference on

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