高精度音频Sigma-Delta调制器综述

A Review of High-Resolution Audio Sigma-Delta Modulator

Sigma-Delta(Σ-Δ)模数转换器(ADC)基于过采样和噪声整形技术,可实现高分辨率,具有无源器件匹配性要求低、结构简单等特点。在高精度音频领域,Σ-ΔADC能够实现高动态范围和良好的功率效率得到了广泛的关注和应用。近年来,依托先进工艺、先进技术进行低功耗高精度的音频ADC的设计已经成为新的研究热点。然而随着工艺技术向低节点的持续发展、电源电压的不断降低,使得Σ-ΔADC的电路设计更具挑战性。该文对高精度音频Sigma-Delta调制器的离散型设计、连续型设计的研究现状进行综述,为高精度音频Sigma-Delta调制器设计提供理论支撑,并给出研究前景展望。

Sigma-Delta(Σ-Δ)Analog-to-Digital Converter(ADC)is based on oversampling and noise shaping techniques to achieve high-resolution,and is characterized by low passive component matching requirements and simple structure.In high-resolution audio applications,Σ-ΔADC has gained widespread attention and applications since it can achieve high dynamic range with good power efficiency.Recently,there has been a growing research trend in designing low-power,high-resolution audio ADCs using advanced processes and technologies.However,with process technology going to lower nodes and the reduction of supply voltages,the circuit design becomes more challenging.This paper reviews the state-of-the-art of the discrete-time and continuous-time design of high-resolution audio Sigma-Delta modulators,provides theoretical background for the design of high-resolution audio Sigma-Delta modulators,and gives research prospects.