A high efficiency PWM CMOS class-D audio power amplifier  

作　　者：朱樟明 刘帘曦 杨银堂 雷晗 

机构地区：[1]Institute of Microelectronics,Xidian University [2]Xi'an Power-Rail Micro Co.,Ltd

出　　处：《Journal of Semiconductors》2009年第2期48-53,共6页半导体学报（英文版）

基　　金：supported by the National Outstanding Young Scientist Foundation of China (No. 60725415);the National Natural ScienceFoundation of China (No. 60676009);the Doctor Foundation of Ministry of Education (No. 20050701015);the InnovationFunds (No. 07C26226101993).

摘　　要：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 0.5μm 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 pA, The active area of the class-D audio power amplifier is about 1.47 × 1.52 mm^2. With the good performance, the class-D audio power amplifier can be applied to several audio power systems.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 0.5μm 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 pA, The active area of the class-D audio power amplifier is about 1.47 × 1.52 mm^2. With the good performance, the class-D audio power amplifier can be applied to several audio power systems.

关 键 词：class-D audio amplifier PWM CMOS high efficiency rail-to-rail comparator DIFFERENCE 

分 类 号：TN722[电子电信—电路与系统]