An in situ Digital Background Calibration Algorithm for Multi-Channel R-βR Ladder DACs  

作　　者：Liang-Jian Lyu Qing-Zhen Wang Ze-Peng Huang Xing Wu 

机构地区：[1]the in situ Devices Center,School of Communication and Electronic Engineering,East China Normal University,Shanghai 200241

出　　处：《Journal of Electronic Science and Technology》2022年第1期43-54,共12页电子科技学刊（英文版）

基　　金：supported by the Shanghai Municipal of Science and Technology Project under Grant No.20JC1419500;the Open Research Projects of Zhejiang Lab under Grant No.2021MC0AB06.

摘　　要：The R-2R resistor ladder is one of the best topologies for implementing compact-sized digital-to-analog converter(DAC)arrays in implantable neuro-stimulators.However,it has a limited resolution and considerable inter-channel variation due to component mismatches.To avoid losing analog information,we present sub-radix-2 DAC implemented by the R-βR resistor ladder in this paper.The digital successive approximation register(DSAR)algorithm corrects the transfer function of DACs based on their actual bit weights.Furthermore,a low-cost in situ adaptive bit-weight calibration(ABC)algorithm drives the analog output error between two DACs to zero by adjusting their bit weights automatically.The simulation results show that the proposed algorithm can calibrate the non-linear transfer function of each DAC and the gain error among multiple channels in the background.

关 键 词：Digital calibration digital-to-analog converter gain error in situ MISMATCH non-linearity resistor ladder 

分 类 号：TN792[电子电信—电路与系统]