JSSC 2011第12期Clocking & PLLs0.25微米

True Filterless Class-D Audio Ampliﬁer

介绍了一种采用标准0.25微米CMOS技术的无滤波器D类音频放大器，具有高效率和低谐波失真。

0.25微米CMOS, 1.2W输出功率, 103dB SNR, 57%/48%/37%效率, 3.1W最大输出功率(1% THD)

音频功率放大器D类放大器无滤波器脉宽调制电源抑制比

▸新型D类放大器架构

▸引入均匀脉宽调制(UPWM)

▸高电源抑制比(PSRR)和低谐波失真(THD)

Abstract

Amadi Abstract—The design of a fully integrated, ﬁlterless, class-D audio ampliﬁer in standard 0.25- m CMOS technology is de- scribed: a novel class-D ampliﬁer architecture, where uniform pulsewidth modulation is introduced. The architecture attenuates residual clock signals around the loop allowing very low harmonic distortion, 95 dB, to be achieved in conjunction with high PSRR, 96 dB at 217 Hz. When driving 1.2 W into an 8- /10 load, it achieves an SNR of 103 dB (A-weighted) with an efﬁcien