A 455 nW 220 fJ/conversion-step 12 bits 2 kS/s SAR ADC for portable biopotential acquisition systems  

作　　者：张辉 秦亚杰 杨思宇 洪志良 

机构地区：[1]State Key Laboratory of ASIC & System Fudan University

出　　处：《Journal of Semiconductors》2011年第1期79-84,共6页半导体学报（英文版）

基　　金：Project supported by the State Key Laboratory of ASIC & System,China

摘　　要：An ultra-low power 12 bits 2 kS/s successive approximation register analog-to-digital converter （ADC） is presented. For power optimization, the voltage supply of the digital part is lowered, and the offset voltage of the latch is self-calibrated. Targeted for better linearity and lower noise, an improved digital-to-analog converter capacitor array layout strategy is presented, and a low kick-back noise latch is proposed. The chip was fabricated by using 0.18μm 1P6M CMOS technology. The ADC achieves 61.8 dB SNDR and dissipates 455 nW only, resulting in a figure of merit of 220 fJ/conversion-step. The ADC core occupies an active area of only 674 ×639μm2.An ultra-low power 12 bits 2 kS/s successive approximation register analog-to-digital converter （ADC） is presented. For power optimization, the voltage supply of the digital part is lowered, and the offset voltage of the latch is self-calibrated. Targeted for better linearity and lower noise, an improved digital-to-analog converter capacitor array layout strategy is presented, and a low kick-back noise latch is proposed. The chip was fabricated by using 0.18μm 1P6M CMOS technology. The ADC achieves 61.8 dB SNDR and dissipates 455 nW only, resulting in a figure of merit of 220 fJ/conversion-step. The ADC core occupies an active area of only 674 ×639μm2.

关 键 词：ADC SAR low power biopotential acquisition system 

分 类 号：TN792[电子电信—电路与系统] P631.43[天文地球—地质矿产勘探]