An energy-efficient and highly linear switching capacitor procedure for SAR ADCs  

作　　者：马瑞 白文彬 朱樟明 

机构地区：[1]School of Microelectronics,Xidian University

出　　处：《Journal of Semiconductors》2015年第5期175-180,共6页半导体学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Nos.61234002,61322405,61306044,61376033);the National High-Tech Program of China(Nos.2012AA012302,2013AA014103)

摘　　要：An energy-efficient and highly linear capacitor switching procedure for successive approximation regis- ter （SAR） ADCs is presented. The proposed switching procedure achieves 37% less switching energy when compared to the well-known VcM-based switching scheme. Moreover, the proposed method shows better linearity than the VcM-based one. The proposed switching procedure is applied to a 10-bit 1.0 V 300 kS/s SAR ADC implemented in 0.18μm standard CMOS. The measured results show the SAR ADC achieves an SNDR of 55.48 dB, SFDR of 66.98 dB, and consumes 2.13 μW at a 1.0 V power supply, resulting in a figure-of-merit of 14.66 fJ/conversion- step. The measured peak DNL and 1NL are 0.52/-0.47 LSB and 0.72/-0.79 LSB, respectively, and the peak INL 1 is observed at 4^-1 VFS and 4^-3 VFS, the same as the static nonlinearity model.An energy-efficient and highly linear capacitor switching procedure for successive approximation regis- ter （SAR） ADCs is presented. The proposed switching procedure achieves 37% less switching energy when compared to the well-known VcM-based switching scheme. Moreover, the proposed method shows better linearity than the VcM-based one. The proposed switching procedure is applied to a 10-bit 1.0 V 300 kS/s SAR ADC implemented in 0.18μm standard CMOS. The measured results show the SAR ADC achieves an SNDR of 55.48 dB, SFDR of 66.98 dB, and consumes 2.13 μW at a 1.0 V power supply, resulting in a figure-of-merit of 14.66 fJ/conversion- step. The measured peak DNL and 1NL are 0.52/-0.47 LSB and 0.72/-0.79 LSB, respectively, and the peak INL 1 is observed at 4^-1 VFS and 4^-3 VFS, the same as the static nonlinearity model.

关 键 词：analog-to-digital converter capacitor switching procedure switching energy LINEARITY successive approximation register 

分 类 号：TM53[电气工程—电器]