一种降低D类功率放大器开关噪声的设计  

A design for reducing switching noise of Class-D power amplifier

作　　者：顾爱民 GU Aimin(Shanghai Marine Electronic Equipment Researsh Institute,Shanghai 201108,China)

机构地区：[1]上海船舶电子设备研究所,上海201108

出　　处：《声学技术》2020年第2期257-260,共4页Technical Acoustics

基　　金：研究所内部基金(170623)。

摘　　要：传统D类功率放大器因特有的开关噪声对水下电子设备的信号接收、通信控制和信号传输等电信号产生很大的干扰,限制了D类功率放大器在水下电子设备中的广泛应用针对这一现象,首先阐明了Σ-Δ调制的D类功率放大器降低开关噪声的原理,然后对传统调制方式和Σ-Δ调制方式的D类功率放大器进行原理分析,并在Simulink软件中进行仿真对比。仿真结果表明,传统D类功率放大器在开关频率处的开关噪声能量高,Σ-Δ调制的D类功率放大器的开关噪声能量分散在一定的带宽内,并且开关噪声能量峰值低于传统D类功率放大器。The switching noise accompanying in traditional Class-D power amplifier operation limits its wide application in underwater equipment due to its bad impacts on signal reception,communication control and signal transmission.In view of this phenomenon,this paper first explains the principle of reducing switching noise of Class-D power amplifier by usingΣ-Δmodulation,and then analyzes and compares the principles of Class-D power amplifier modulated by traditional PWM andΣ-Δmodes with Simulink software.The simulation results show that the traditional Class-D power amplifier generates high energy switching noise at the switching frequency,and theΣ-Δmodulated Class-D power amplifier makes the switching noise energy dispersing in a certain bandwidth,so that the peak energy of switching noise is lower than that of the traditional PWM modulation mode.

关 键 词：开关噪声 Σ-Δ调制 D类功率放大器 

分 类 号：TB556[理学—物理]