A 121dB DR, 0.0017% THD+N, 8× Jitter-Effect Reduction Digital-Input Class-D Audio Amplifier with Supply-VoltageScaling Volume Control and Series-Connected DSM

📋 论文概要

本论文提出了一种数字输入Class-D音频放大器，通过电源电压缩放技术提升移动设备中的输出功率并保持高效率，同时实现了8倍的抖动效应降低，达到了121dB动态范围和0.0017% THD+N的高性能。

💡 主要创新点

• 提出电源电压缩放(Supply-VoltageScaling)技术，在宽输出功率范围内实现高效率，无需外部升压转换器。
• 实现8倍抖动效应降低(Jitter-Effect Reduction)，显著提升音频质量。
• 整体电路达到121dB动态范围和0.0017% THD+N的优异性能。

🏷 关键词

📄 原文摘要

Class-D audio amplifiers have gradually become standard components in mobile devices, where better audio quality over a wide volume range and higher output power (POUT) are desired. However, in mobile devices, the POUT is limited since Li-ion batteries operate at 3 to 4.2V. To increase POUT, prior publications [1-3] have developed embedded boost converters to regulate boosted supply voltage VPVDD to 5V or higher for the Class-D power stage at the expense of efficiency degradation. The top of Fig. 31.3.1 shows a typical digital-input open-loop Class-D audio amplifier, where the boost converter is operated only when high POUT is required. The input signal is first multiplied by the digital volume level, and then processed by an interpolator and a delta-sigma modulator (DSM) to achieve a high signal-to-quantization-noise ratio (SQNR). Next, the DSM output is converted into a PWM signal with a 384kHz switching frequency fSW, Class-D by the PCMto-PWM converter to drive the power stage. The

👥 作者与机构

Wei-Hao Sun, Shih-Hsiung Chien, Tai-Haur Kuo

National Cheng Kung University, Tainan, Taiwan