数字D类功放因其高效率和便于与数字音源接口的特点，近年来在音频电子领域引起了广泛关注。Sigma-Delta调制器作为数字D类功放中关键的数字信号处理模块之一，其噪声整形特性能够在降低功放系统实现代价的同时，保持甚至提高系统的输出信噪比，并可抑制部分信号传输路径引入的噪声，在数字音频信号处理过程中具有重要作用。首先总结了数字D类功放的工作原理和主流架构，然后结合Sigma-Delta调制器的基本原理，探讨了近年来用于数字D类功放的Sigma-Delta调制器的设计方案，其中着重对Sigma-Delta调制器的架构设计与噪声传递函数的设计进行综述，最后对数字D类功放的Sigma-Delta调制器研究发展进行总结。

In recent years, digital class D power amplifiers have attracted widespread attention in the audio electronics field due to their high efficiency and seamless integration with digital audio sources. As one of the crucial digital signal processing modules in digital class D amplifiers, the Sigma-Delta modulator plays a pivotal role for digital audio signal processing. The noise-shaping characteristic of the Sigma-Delta modulator can reduce the implementation cost of the power amplifier system while maintaining or even improving the output signal-to-noise ratio of the system, and can suppress the noise introduced by some signal transmission paths. Firstly, the working principle and mainstream architecture of digital D-class power amplifiers were summarized. Then, based on the basic principle of Sigma-Delta modulators, the design schemes of Sigma-Delta modulators used in digital D-class power amplifiers in recent years were discussed, with a focus on the architecture design and noise transfer function design of Sigma-Delta modulators. Finally, the research and development of Sigma-Delta modulators for digital D-class power amplifiers were summarized.