电子科技2025，Vol.38Issue(6)：58-64,7.DOI:10.16180/j.cnki.issn1007-7820.2025.06.009
一种采用电阻阵列的SAR ADC设计
A SAR ADC Design Using Resistance Arrays
摘要
Abstract
SAR ADC(Successive Approximation Register Analog Digital Converter)is a kind of ADC with low power consumption,simple structure,reliable performance,and wide range of accuracy and sampling rate,so it is widely used in various integrated circuits.Conventional SAR ADCs use capacitor arrays to provide analog reference voltages,but capacitor arrays require a larger area,which reduces the yield per wafer and increases the cost.In this study,an existing R2R DAC(Digital Analog Converter)structure is used to provide analog reference voltage instead of capacitor array to reduce the circuit area.Compared to traditional resistive DAC structures,R2R DAC structures consume less power.The flip circuit is added to eliminate the common mode noise in the circuit design,and the pro-tection ring and pseudotube are added to ensure the matching degree and reliability.With the same accuracy,the ef-fective area of the SAR ADC circuit is reduced by about 35％.After extracting parasitic parameters,the ENOB(Ef-fective Number of Bits)and SNDR(Signal-to-Noise-and-Distortion Ratio)of the simulated ADC are 9.93 bit and 61.51 dB,and the simulation error is less than 1 LSB(Least Significant Number)under different PVT(Process Volt-age Temperature)conditions.关键词
SAR ADC/DAC/集成电路/模拟电路/比较器/电阻阵列/差分电路/版图匹配Key words
SAR ADC/DAC/integrated circuit/analog circuit/comparator/resistor array/differential cir-cuit/layout matching分类
电子信息工程引用本文复制引用
欧昊然,张轩雄..一种采用电阻阵列的SAR ADC设计[J].电子科技,2025,38(6):58-64,7.基金项目
国家自然科学基金(62276167)National Natural Science Foundation of China(62276167) （62276167）
