应用于SAR ADC的高能效电容开关转换方案  

An Energy-Efficient Capacitor Switching Scheme Applied for SAR ADC

作　　者：曾华林 唐雨晴 谢亮 金湘亮 ZENG Hualin;TANG Yuqing;XIE Liang;JIN Xiangliang(School of Physics and Optoelectronics,Xiangtan University,Xiangtan,Hunan 411105,P.R.China;Hunan Engineering Laboratory for Microelec.,Optoelec.and System on a Chip,Xiangtan,Hunan 411105,P.R.China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105 [2]微光电与系统集成湖南省工程实验室,湖南湘潭411105

出　　处：《微电子学》2018年第4期467-470,共4页Microelectronics

基　　金：国家自然科学基金资助项目(61774129;61233010);湖南省自然科学杰出青年基金资助项目(2015JJ1014)

摘　　要：针对逐次逼近型模数转换器,提出了一种新型高能效的电容开关转换方案。在前3个比较周期内,该新型电容开关不消耗转换功耗。从第4个比较周期开始,采用了拆分电容技术、单边双电平转换技术,使得一侧的电容只在2个参考电压Vcm与地之间进行切换,进一步节省了功耗。仿真结果表明,与传统电容阵列相比,该新型电容开关的转换功耗降低了99.23%,总电容面积减小了75%。微分非线性为0.162LSB,积分非线性为0.163LSB。A new improved energy-efficient capacitor switching scheme was proposed for the successive approximation register analog-to-digital converter.The proposed switching scheme achieved no switching energy consumption in the first three comparisons.Starting from the fourth comparison,the split-capacitor technology and the one-side double-level switching technology were employed,so only one side of the capacitor had switched between the two reference voltages Vcmand GND,which had further saved power consumption.The simulation results showed that the proposed switching scheme achieved 99.23% reduction in switching energy and the total capacitance area was reduced by 75% compared with that of the traditional structured capacitor arrays.The DNL and the INL were 0.162 LSB and 0.163 LSB respectively.

关 键 词：逐次逼近型模数转换器 高能效 转换方案 

分 类 号：TN792[电子电信—电路与系统]