A 72-dB-SNDR rail-to-rail successive approximation ADC using mismatch calibration techniques  

作　　者：刘岩 华斯亮 王东辉 侯朝焕 

机构地区：[1]Institute of Acoustics,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2012年第12期100-105,共6页半导体学报（英文版）

摘　　要：When the voltage of an analog input signal is equal to the supply voltage, it is difficult for a conventional successive approximation ADC to correctly convert the analog signal into digital signal. This paper introduces an improved successive approximation ADC, which can convert the rail-to-rail input range and reduce sampling time through a track-and-hold circuit. Comparator offset cancellation and capacitor self-calibration techniques are used in this ADC. Measurement results show that the peak SNDR of this ADC reaches 72 dB and the signal effective bandwidth is up to 1.25 MHz. It consumes 1 mW in the test, and the figure of merit is 123 fJ/conversion-step.When the voltage of an analog input signal is equal to the supply voltage, it is difficult for a conventional successive approximation ADC to correctly convert the analog signal into digital signal. This paper introduces an improved successive approximation ADC, which can convert the rail-to-rail input range and reduce sampling time through a track-and-hold circuit. Comparator offset cancellation and capacitor self-calibration techniques are used in this ADC. Measurement results show that the peak SNDR of this ADC reaches 72 dB and the signal effective bandwidth is up to 1.25 MHz. It consumes 1 mW in the test, and the figure of merit is 123 fJ/conversion-step.

关 键 词：RAIL-TO-RAIL mismatch calibration THA successive approximation ADC 

分 类 号：TN792[电子电信—电路与系统] V556.3[航空宇航科学与技术—人机与环境工程]