高精度低功耗噪声整形SAR ADC设计  

Noise-Shaping SAR ADC Design of High Accuracy and Low Power Consumption

作　　者：赵壮 付云浩 谷艳雪 常玉春[1,2] 殷景志[1] ZHAO Zhuang;FU Yunhao;GU Yanxue;CHANG Yuchun;YIN Jingzhi(College of Electronic Science and Engineering,Jilin University,Changchun 130012,China;College of Microelectronics,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]吉林大学电子科学与工程学院,长春130012 [2]大连理工大学微电子学院,辽宁大连116024

出　　处：《吉林大学学报（信息科学版）》2024年第2期226-231,共6页Journal of Jilin University（Information Science Edition）

基　　金：吉林省发展改革委基金资助项目(2019C035-3)。

摘　　要：针对传统无源有损积分环路滤波器相较于有源无损积分环路滤波器,具有功耗低、电路设计简单等特点,但其噪声传输函数(NTF:Noise Transfer Function)平滑,噪声整形效果较弱的问题,提出了一种无源无损的二阶积分环路滤波器,保留了无源有损积分优点的同时具有良好噪声整形效果。设计了一款分辨率为16 bit、采样率为2 Ms/s的混合架构噪声整形SAR ADC。仿真结果表明,在125 kHz带宽、过采样比为8时,实现了高信号与噪声失真比(SNDR(Signal to Noise and Distortion Ratio)为91.1 dB)、高精度(14.84 bit)和低功耗(285μW)的性能。The design of the loop filter in noise-shaping SAR ADC(Successive Approximation Register Analogto Digital Converter)is the key to the effect of noise shaping and is also an important module to achieve high accuracy performance.Compared with the active lossless integral loop filter,the traditional passive lossy integral loop filter has the characteristics of low power consumption and simple circuit design,but its NTF(Noise Transfer Function)is smooth and the noise shaping effect is weak.To solve this problem,a passive lossless second-order integral loop filter is proposed,which retains the advantages of the passive lossy integral loop filter and has a good noise shaping effect.A hybrid architecture noise-shaping SAR ADC with a resolution of 16 bits and a sampling rate of 2 Ms/s is also designed.The simulation results show that high SNDR(Signal to Noise and Distortion Ratio)(91.1 dB),high accuracy(14.84 bits),and low power consumption(285μW)are achieved when the bandwidth is 125 kHz and the oversampling ratio is 8.

关 键 词：逐次逼近型模数转换器 噪声整形SAR ADC 高精度 低功耗 

分 类 号：TN431.1[电子电信—微电子学与固体电子学]