高效数字音频功率放大器设计

High Efficiency Digital Audio Power Amplifier Design

摘要：数字音频功率放大器具有体积小、重量轻、可靠性高的特点，但由于器件并非工作在理想状态下，为进一步提高数字功放的效率，通过将双边带三电平自然采样法（NBDD）脉宽调制技术引入数字功放的脉宽调制设计，并将Dead-Time技术引入开关放大器的设计中，提出了高效数字音频功率放大器的优化设计方案，从而提高了整机的失真度指标，降低了低通滤波器设计阶数、改善了信噪比。

Digital audio power amplifier has the characteristic of small volume,light weight and high efficiency, but the components don＇t work on ideal condition in reality, so for improving the efficiency of digital amplifier further, through adopting NBDD technology to PWM design, and applying Dead-Time to switching amplifier, this paper proposed an optimize design of high efficiency digital audio power amplifier, which minishing distortion,reducing LPF order, and improving S/N.