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JSSC 2009第12期Clocking & PLLs0.5μm

Low-Power High-Efficiency Class D Audio Power Amplifiers

介绍两种低功耗高效率的D类音频功率放大器设计。
0.5μm CMOS, 2.7V, 250mW, 89/90%效率, 0.02/0.03% THD+N
D类放大器低功耗高效率滑动模式控制音频功率放大器
创新点1:采用无时钟模拟设计,通过消除传统架构中的时钟信号生成电路,显著降低了静态功耗(小于传统架构的十分之一),同时保持了89/90%的高效率和0.02/0.03%的低THD+N。
创新点2:基于滞回滑动模式控制器(hysteretic sliding mode controller),避免了传统架构中复杂的高线性三角载波信号生成,简化了电路结构并提高了系统稳定性。
创新点3:提出两种调制方案(二进制调制BMA和三级调制TMA),通过灵活的调制策略优化了功率效率和线性度,实现了250mW输出功率和75dB以上的电源抑制比(PSRR)。
创新点4:采用0.5μm CMOS工艺实现紧凑设计(面积小于1.5mm²),在单2.7V电源下工作,兼具高集成度和低功耗特性,适用于便携式音频设备。
Abstract
The architecture, design, and implementation of two clock-free analog class D audio power amplifiers using 0.5 m CMOS standard technology are introduced. The amplifiers are designed to consume significantly less power than former implementations. Both designs operate with a 2.7 V single voltage supply and deliver a maximum output power of 250 mW into an 8 /10speaker. The two class-D amplifiers are based on a hysteretic sliding mode controller, which avoids the complex task of gener- ating the highly