A 16-bit,±10-V Input Range SAR ADC with a 5-V Supply Voltage and Mixed-Signal Nonlinearity Calibration  

作　　者：LUO Hongrui ZHAO Xianlong JIAO Zihao ZHANG Jie WANG Xiaofei ZHANG Ruizhi ZHANG Hong 

机构地区：[1]School of Microelectronics,Xi’an Jiaotong University,Xi’an 710049,China [2]Beijing Smartchip Microelectronics Company Limited,Beijing 100192,China

出　　处：《Chinese Journal of Electronics》2022年第4期690-697,共8页电子学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(61974118,62004156).

摘　　要：This paper presents a high-precision,successive approximation register(SAR)analog-to-digital converter(ADC)with resistive analog front-end for lowvoltage and wide input range applications.To suppress the serious nonlinearity brought by the voltage coefficients of analog front-end without deteriorating differential nonlinearity performance,a mixed-signal calibration scheme based on piecewise-linear method with calibration digital-to-analog converter is proposed.A compensation current is designed to sink or source from the reference to keep it independent of input signal,which greatly improves the linearity performance.Fabricated in a 0.5-μm CMOS process,the proposed ADC achieves 88-dB signalto-noise-and-distortion ratio and 103-dB spurious free dynamic range with 5-V supply voltage and 2.5-V reference voltage,and the total power consumption is 37.5 mW.

关 键 词：Wide input range Resistive scaling front-end Mixed-signal nonlinearity calibration Precision Successive approximation register(SAR) Current compensation circuit 

分 类 号：TN792[电子电信—电路与系统]