一种用于仪表测量的高精度增量型Delta-Sigma ADC  

A high precision incremental Delta-Sigma ADC for instrument measurement

作　　者：赵固猛 陈群超[1] ZHAO Gu-meng;CHEN Qun-chao(College of Physics and Information Engineering,Fuzhou University)

机构地区：[1]福州大学物理与信息工程学院

出　　处：《中国集成电路》2025年第1期65-69,74,共6页China lntegrated Circuit

摘　　要：本文基于SMIC 0.18μm CMOS工艺设计了一款应用于高精度测量领域的增量型Delta Sigma ADC,该ADC的输入端采用轨到轨运算放大器作为输入驱动缓冲器;Delta Sigma调制器采用二阶积分器级联反馈(CIFB)结构;滤波器采用抽取率为512的三阶级联积分梳状(CIC)滤波器。在1.8 V电源电压与409.6 kHz采样频率的条件下,后仿真结果显示,ADC的输入范围实现了±0.9倍参考电压,ADC等效输入参考的3σ噪声约为12.98μV,达到了16.93位的有效位数(ENOB),系统整体功耗为0.876 mW。This paper presents the design of an incremental Delta Sigma ADC for high-precision measurement applications,based on the SMIC 0.18μm CMOS process.The ADC employs a rail-to-rail operational amplifier as the input buffer.The Delta Sigma modulator adopts a second-order Cascaded Integrator Feedback structure,and the filter utilizes a three-stage Cascaded Integrator Comb filter with a decimation rate of 512.Under conditions of a 1.8 V power supply and a sampling frequency of 409.6 kHz,post-simulation results indicate that the ADC achieves an input range of±0.9 times the reference voltage.The 3σnoise of the ADC equivalent input reference is about 12.98μV,yielding an Effective Number of 16.93 bits.The overall system power consumption is 0.876 mW.

关 键 词：高精度测量 增量型Delta Sigma ADC 轨到轨运放 

分 类 号：TN792[电子电信—电路与系统]