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Design and Analysis of a Self-Oscillating Class D Audio Amplifier Employing a Hys
设计并分析了一种采用迟滞比较器的三阶自激振荡D类音频放大器。
0.7μm CMOS, 116.5 dB动态范围, 0.0012% THD+N, 125 mW@8Ω, 84%效率@1W
D类放大器自激振荡迟滞比较器THD音频放大器
▸创新点1：采用迟滞比较器实现自激振荡，通过消除传统载波发生器的需求简化系统架构，降低设计复杂度和功耗，同时保持高精度（THD+N低至0.0012%）
▸创新点2：提出低成本迟滞补偿技术，有效抑制高输出功率（如1.45W时）下的非线性失真，使THD+N在90%最大功率下仍低于0.006%，显著提升音频保真度
▸创新点3：基于三阶自振荡架构的Class D放大器设计，通过等效模型理论分析THD性能，实现84%以上的高效率（1W输出时）与116.5dB动态范围，兼顾能效与信号质量
▸创新点4：在0.7μm CMOS工艺下集成6mm²紧凑面积，结合5V电源供电方案，为便携式音频设备提供高功率密度（125mW@8Ω）与低失真（0.0012% THD+N）的解决方案
Abstract
A third-order self-oscillating class D audio ampli fier
that utilizes a hysteretic compara tor is presented. The design is an-
alyzed and its THD is theoretica lly determined by employing an
equivalent model, that relates the approach to natural sampling
pulse-width modulation. The architecture eliminates the require-
ment for a high-quality c arrier generator. A l ow-cost hysteresis
compensation technique is utilized to enhance distortion perfor-
mance at high output power levels. An implementat