一种用于音频应用的高动态范围高精度模数转换器  

A High Dynamic Range and High Precision Analog-to-Digital Converter for Audio Applications

作　　者：仵奥迪 陈群超[1] WU Aodi;CHEN Qunchao(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学物理与信息工程学院,福建福州350108

出　　处：《电视技术》2024年第1期22-29,共8页Video Engineering

摘　　要：提出了一种应用于音频应用的Zoom型模数转换器,采用一个5位异步逐次逼近式(Successive Approximation Register,SAR)模拟数字转换器(Analog to Digital Converter,ADC)与3阶多位量化离散时间的Delta-Sigma调制器相结合,通过SAR ADC进行粗量化、Delta-Sigma调制器进行精细量化的方式,实现高的动态范围和精度。该Zoom型模数转换器采用0.18μm CMOS工艺实现,仿真结果表明,在1.8 V电源电压和3.072 MHz采样频率下,实现了109.34 dB的信号噪声失真比(Signalto-Noise-and-Distortion Ratio,SNDR),17.87 bits的有效位数(Effective Number of Bits,ENOB),112.7 dB的动态范围(Dynamic Range,DR),整体电路功耗为3.73 mW。This paper presents a Zoom analog-to-digital converter for audoi applications.Combining a 5-bit asynchronous Successive Approximation Register(SAR)Analog to Digital Converter(ADC)with a third-order multi-bit quantized discrete-time Delta-Sigma modulator.High dynamic range and resolution are achieved by coarse quantization by SAR ADC and fine quantization by Delta-Sigma modulator.This Zoom analog-to-digital converter was implemented in 0.18μm CMOS process.The simulation results showed that it achieved 109.34 dB Signal-to-Noise-and-Distortion Ratio(SNDR),17.87 bits Effective Number of Bits(ENOB)and 112.7 dB Dynamic Range(DR)with a 3.072 MHz sampling frequency and a 1.8 V supply voltage consuming 3.73 mW.

关 键 词：音频应用 模数转换器 DELTA-SIGMA调制器 多位量化 动态范围 

分 类 号：TN912.2[电子电信—通信与信息系统]