← 返回 JSSC 论文列表JSSC 2012第2期Other0.18-μm
A 0018 THDN 88-dB PSRR PWM Class-D Amplifier for Direct Battery Hookup Y oungkil
一款用于直接电池连接的低失真、高PSRR的PWM类D放大器，适用于移动应用。
0.18-μm CMOS, 3.7-V/4.9-V, 750 mW/1.15 W, 85.5%效率, 0.018% THD+N
类D放大器电源抑制比PWM移动应用无滤波器
▸采用三阶环路滤波器实现88 dB的高PSRR
▸应用输入前馈delta-sigma调制器设计技术提升系统性能和稳定性
▸采用无滤波器方法节省PCB空间和系统成本
Abstract
A low-distortion third-order class-D ampli fier that
is fully integrated into a 0.18- mC M O Sp r o c e s sw a sd e s i g n e d
for direct battery hookup in a m obile application. A class-D
amplifier for direct battery hookup must have a suf ficiently high
power supply rejection ratio (PSRR) in preparation for noise,
such as when a global system for mobile communications (GSM)
bursts ripples through the s ystem power line. This ampli fier has
a high PSRR of 88 dB for 217-Hz power supply ripples, usi