J. Semicond. > Volume 30 > Issue 2 > Article Number: 025001

A high efficiency PWM CMOS class-D audio power amplifier

Zhu Zhangming , Liu Lianxi , Yang Yintang and Lei Han

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Abstract: Based on the difference close-loop feedback technique and the difference pre-amp, a high efficiency PWM CMOS class-D audio power amplifier is proposed. A rail-to-rail PWM comparator with window function has been embedded in the class-D audio power amplifier. Design results based on the CSMC 0.5 mm CMOS process show that the max efficiency is 90%, the PSRR is –75 dB, the power supply voltage range is 2.5–5.5 V, the THD+N in 1 kHz input frequency is less than 0.20%, the quiescent current in no load is 2.8 mA, and the shutdown current is 0.5 mA. The active area of the class-D audio power amplifier is about 1.47 × 1.52 mm2. With the good performance, the class-D audio power amplifier can be applied to several audio power systems.

Key words: class-D audio amplifier PWM CMOS high efficiency rail-to-rail comparator difference


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Zhu Z M, Liu L X, Yang Y T, Lei H. A high efficiency PWM CMOS class-D audio power amplifier[J]. J. Semicond., 2009, 30(2): 025001. doi: 10.1088/1674-4926/30/2/025001.

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Manuscript received: 18 August 2015 Manuscript revised: 07 October 2008 Online: Published: 01 February 2009

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