A digital input class-D audio amplifier with sixth-order PWM  

作　　者：骆树萌 李冬梅 

机构地区：[1]Institution of Microelectronics, Tsinghua University [2]Electronic Engineering Department, Tsinghua University

出　　处：《Journal of Semiconductors》2013年第11期99-104,共6页半导体学报（英文版）

基　　金：supported by the National High Technology Research and Development Program of China(No.2012AA012301);the National Natural Science Foundation of China(No.61171001)

摘　　要：A digital input class-D audio amplifier with a sixth-order pulse-width modulation （PWM） modulator is presented. This modulator moves the PWM generator into the closed sigma-delta modulator loop. The noise and distortions generated at the PWM generator module are suppressed by the high gain of the forward loop of the sigma-delta modulator. Therefore, at the output of the modulator, a very clean PWM signal is acquired for driving the power stage of the class-D amplifier. A sixth-order modulator is designed to balance the performance and the system clock speed. Fabricated in standard 0.18 μm CMOS technology, this class-D amplifier achieves 110 dB dynamic range, 100 dB signal-to-noise rate, and 0.0056% total harmonic distortion plus noise.A digital input class-D audio amplifier with a sixth-order pulse-width modulation （PWM） modulator is presented. This modulator moves the PWM generator into the closed sigma-delta modulator loop. The noise and distortions generated at the PWM generator module are suppressed by the high gain of the forward loop of the sigma-delta modulator. Therefore, at the output of the modulator, a very clean PWM signal is acquired for driving the power stage of the class-D amplifier. A sixth-order modulator is designed to balance the performance and the system clock speed. Fabricated in standard 0.18 μm CMOS technology, this class-D amplifier achieves 110 dB dynamic range, 100 dB signal-to-noise rate, and 0.0056% total harmonic distortion plus noise.

关 键 词：PWM class-D digital audio SIGMA-DELTA 

分 类 号：TN722.14[电子电信—电路与系统]