A high efficiency PWM CMOS class-D audio power amplifier |
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| Zhu Zhangming, Liu Lianxi, Yang Yintang, Lei Han. A high efficiency PWM CMOS class-D audio power amplifier[J]. Journal of Semiconductors, 2009, 30(2): 025001. doi: 10.1088/1674-4926/30/2/025001 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.Export: BibTex EndNote |
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| Authors: | Zhu Zhangming Liu Lianxi Yang Yintang Lei Han |
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| Affiliation: | Institute of Microelectronics, Xidian University, Xi'an 710071, China;Institute of Microelectronics, Xidian University, Xi'an 710071, China;Institute of Microelectronics, Xidian University, Xi'an 710071, China;Xi'an Power-Rail Micro Co., Ltd, Xi'an 710075, China |
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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 μm 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 μA. 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. |
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| Keywords: | class-D audio amplifier PWM CMOS high efficiency rail-to-rail comparator difference |
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