D类数字功率放大器电路失真分析及其负反馈方案讨论

Distortion Analysis and Negative Feed-back Study

本文采用Bennett方法[1]对D类数字功率放大电路进行失真分析，在此基础上讨论了用负反馈设计来降低失真的可行性方案。以一个10-W放大器为实例，分析仿真结果表明：THD为0.03-0.6%，能量转换效率达89%。

Distortion analysis on the class-D power amplifiers by Bennett method is presented. The feasible scheme of reducing distortion using negative feedback is also discussed. A 10-W amplifier is taken as an example and the analysis of simulation result shows that THD is within the range of 0.03-0.6%，and the efficiency approximately reaches 89%.