摘要
D类音频功率放大器是基于脉冲宽度调制(PWM)技术的开关放大器,包括PWM调制器、功率H桥、三角波发生器和低通滤波器等。文章首先对D类音频功率放大器与传统的音频功放进行了分析和比较,然后对D类音频功率放大器的工作原理、系统结构和两种拓扑结构进行了详细的分析和研究,最后对具有低功耗、低失真、高效率等高性能D类音频功放设计的难点和要点进行了研究,并提供了可行的解决方案,展望D类音频功放的发展趋势。
Class D audio power amplifier, including PWM modulator, power H-bridge, triangular wave generator, and low-pass filter and so on, is a switch amplifier with PWM technique as its basis. In this paper, a detailed compare and relevant analysis between class D audio power amplifier and traditional types was summarized. After introducing the functionality, system structure and two topologies of class D, a deep research toward key design difficulties and essentials of corresponding solutions for low-power, low-distortion, high-efficiency audio power amplifier was presented. At last, the outlook for class D audio power amplifiers was brought up.
出处
《电子与封装》
2008年第6期21-25,29,共6页
Electronics & Packaging
关键词
脉宽调制
脉冲密度调制
H-桥
扩频调制
pulse width modulation
pulse density modulation
H-bridge
spread spectrum mode
