The digital audio power amplifier has the characteristics of small volume, light weight and high efficiency.In order to improve the SNR and reduce the order of low bandpass filter, an optimized design scheme of high efficiency digital audio power amplifier is introduced through adopting NBDD technology to PWM design, and applying Dead-Time to switching amplifier.%数字音频功率放大器具有体积小、重量轻、可靠性高的特点,但其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.
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