数字多媒体中的D类音频功率放大器

随着设计技术的不断进步,D类功率放大器的性能指标也逐渐接近AB类放大器。本文系统介绍了基于PWM调制的立体声D类音频功率放大器,该产品采用高效的D类工作模式,领先的音频性能,同时具有高效的抑制电路、极低的总谐波失真以及卓越的信噪比等特点。该放大器具有简易的面板布局和极低的电磁干扰(EMI),可显著加速诸如DLP、HDTV、液晶电视(LCD)以及等离子电视包含在内的大中型DTV屏幕数字多媒体的开发进程。

With the continuous advancement of technology, design, D-type power amplifier performance is also moving into the Class AB amplifier. In this paper based on PWM modulation D stereo audio power amplifier, the product is highly efficient Class D mode, the leading audio performance, at the same time highly efficient suppression circuit, low total harmonic distortion and excellent signal to noise ratio and so on. The amplifier has a simple panel layout and low electromagnetic interference （EMI）, can significantly speed up, such as DLP, HDTV, LCD TV （LCD） and plasma TV included the large and mediumsized screen DTV digital multimedia development process.