频率抖动技术在D类放大器设计中的应用  

Application of Frequency Jitter Technique on the Design for the Class D Amplifier

作　　者：刘德才[1] 黄继业[1] 高明煜[1] 

机构地区：[1]杭州电子科技大学电子信息学院,浙江杭州310018

出　　处：《电子测量与仪器学报》2008年第S2期204-206,共3页Journal of Electronic Measurement and Instrumentation

基　　金：省科技厅面上计划资助项目(C21G2040026)

摘　　要：传统的D类放大器采用固定采样频率,引起总谐波失真和电磁干扰等问题。该文先对频率抖动调制技术的工作原理进行分析,然后对D类放大器采用的高频三角波应用频率抖动,通过仿真实验对生成的方波频谱进行分析,验证了采用频率抖动技术可以降低D类放大器的低次谐波的幅度,具有抑制电磁干扰的作用。The modulation of traditional Class D amplifiers based on the fixed sampling frequency usually caused many problems,such as the total harmonic distortion and electromagnetic interference,etc. This paper analyzed working principle of the jitter frequency modulation in the first,and then promoted a improving method,in which frequency jitter was applied in high-frequency triangle wave used in the Class D amplifiers. By analyzed the frequency spectrum of square-wave,the simulation Experimental result was derived to verify that this method could suppress the amplitude of the lower order harmonic and the EMI.

关 键 词：频率抖动 D类放大器 频率调制 电磁干扰 

分 类 号：TN722[电子电信—电路与系统]