一种前后台结合的SAR ADC的校准算法  

A Calibration Algorithm for SAR ADC Combining Foreground and Background

作　　者：黄立朝 芮小军 章宇新 樊华[2,3,4] 王煜楠 冯全源 HUANG Lichao;RUI Xiaojun;ZHANG Yuxin;FAN Hua;WANG Yunan;FENG Quanyuan(The 58th Research Institute of China Electronics Technology Group Corporation,Wuxi,Jiangsu 214063,P.R.China;Chongqing Institute of Microelectronics Industry Technology,UESTC,Chongqing 401331,P.R.China;Institute of Electronic and Information Engineering of UESTC in Guangdong,UESTC,Dongguan,Guangdong 523808,P.R.China;School of Integrated Circuit Science and Engineering(Exemplary School of Microelectronics),UESTC,Chengdu 611731,P.R.China;School of Shenzhen Institute for Advanced Studies,UESTC,Shenzhen,Guangdong 518000,P.R.China;School of Information Science and Technology,Southwest Jiaotong University,Chengdu 611756,P.R.China)

机构地区：[1]中国电子科技集团公司第五十八研究所,江苏无锡214063 [2]电子科技大学重庆微电子产业技术研究院,重庆401331 [3]电子科技大学广东电子信息工程研究院,广东东莞523808 [4]电子科技大学集成电路科学与工程学院(示范性微电子学院),成都611731 [5]电子科技大学(深圳)高等研究院,广东深圳518000 [6]西南交通大学信息科学与技术学院,成都611756

出　　处：《微电子学》2023年第4期561-567,共7页Microelectronics

基　　金：国家自然科学基金面上项目(62371109);重庆市自然科学基金面上项目(2022NSCQ-MSX5348);广东省基础与应用基础研究基金(2023A1515010041);四川省科技计划项目(2022YFG0164);国家自然科学基金重大项目(62090012)

摘　　要：提出了一种数字前台校准技术,即电容重组技术,并将该技术与LMS数字后台校准技术相结合,提高了LMS算法的收敛速度。提出的算法使用RC混合结构的14位SAR ADC进行建模。仿真结果表明,LMS算法的收敛速度可以提高到1 k个转换周期内,同时校准后ADC的ENOB平均值从10.59 bit提高到13.79 bit。SFDR平均值从71.33 dB提高到112.93 dB,DNL最大值的平均值从1.88 LSB提高到0.97 LSB。INL最大值的平均值从8.01 LSB提高到0.88 LSB。A digital foreground calibration technique,capacitor recombination technique,is proposed.The convergence speed of LMS algorithm was improved by combining this technique with LMS digital background calibration technique.The proposed algorithm was modeled using a 14-bit SAR ADC with RC hybrid structure.Simulation results show that the convergence speed of LMS algorithm can be improved to within 1 k conversion cycles,and the mean ENOB of the calibrated ADC is increased from 10.59 bit to 13.79 bit.The mean value of SFDR is increased from 71.33 dB to 112.93 dB,and the mean value of DNL maximum is increased from 1.88 LSB to 0.97 LSB.The mean value of INL maximum is increased from 8.01 LSB to 0.88 LSB.

关 键 词：逐次逼近型模数转换器 最小均方根 数字校准 电容重组 

分 类 号：TN792[电子电信—电路与系统]