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A 120 dB Dynamic Range 400 mW Class-D Speaker Driver With Fourth-Order PWM Modul
本文提出一种高效Class-D扬声器驱动，采用四阶PWM调制，实现120 dB动态范围和88%能效。
120 dB动态范围，88%能效，2.4 mA静态电流
Class-D数字-模拟转换器PWM调制器扬声器驱动高效能
▸创新点1：采用四阶数字PWM调制器架构，通过高阶调制显著提升动态范围至120 dB，同时降低量化噪声和失真，属于系统级创新。
▸创新点2：实现24 MHz高时钟速率的PWM信号处理，提供单周期内脉冲边缘时序分辨率，有效减少时序抖动和采样失真，属于电路设计创新。
▸创新点3：利用数字调制器反馈环路的高前向环路增益，抑制低速率PWM信号的均匀采样时序失真，提升音频保真度，属于方法创新。
▸创新点4：结合22位数字音频输入的高保真DAC功能与扬声器驱动，在8Ω负载下实现88%的功率效率，属于集成化系统创新。
Abstract
and Todd L. Brooks
Abstract—High efficiency Class-D speaker drivers have become
ubiquitous in battery driven mobile audio applications. Analog
switching errors and timing jitter are known limitations to the
dynamic range in these types of switching audio drivers. To
overcome these limitations the Class-D architecture chosen in this
paper provides a low 667 kHz pulse rate. This architecture is based
on a 4th-order digital modulator with pulse-width modulation
(PWM) feedback. The modulator loop pr