Journal of South China University of Technology (Natural Science Edition) ›› 2015, Vol. 43 ›› Issue (9): 47-53,66.doi: 10.3969/j.issn.1000-565X.2015.09.008

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

High Energy-Efficient Capacitor Array DAC for SAR ADC

Hu Yun-feng1,2  Li Bin1  Wu Zhao-hui1   

  1. 1． School of Electronic and Information Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China; 2． Zhongshan Institute，University of Electronic Science and Technology of China，Zhongshan528402，Guangdong，China
  • Received:2015-03-17 Revised:2015-04-22 Online:2015-09-25 Published:2015-09-07
  • Contact: 李斌(1967-)，女，教授，博士生导师，主要从事半导体器件与模拟集成电路研究． E-mail:phlibin@scut.edu.cn
  • About author:胡云峰(1982-)，男，在职博士生，电子科技大学中山学院讲师，主要从事逐次逼近型模数转换器研究． E-mail: shanhuyf@163.com
  • Supported by:
    Supported by the National Natural Science Foundation of China(60976026) and the General Program of the
    National Natural Science Foundation of China(61571196)

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Abstract: Capacitor array digital-to-analogue converter (DAC) is one of the main energy consumption sources of
successive approximation register analogue-to-digital converter (SAR ADC)． In order to reduce the energy consumption of capacitor array DAC，this paper proposes a high energy-efficient capacitor array DAC structure． In the structure，each capacitor part is connected in turn through a switch． In the first two comparison cycles，owing to the top-plate sampling technique and the level shift technique，there is no switching energy consumption in the capacitor array DAC; in the rest of comparison cycles from the third to the nth，owing to the charge sharing technique and the voltage monotonic down technique，there exists a low switching energy consumption in the capacitor array DAC．
Simulation results show that，in comparison with the traditional capacitor array DAC structure，the proposed struc-
ture can decrease the energy consumption by 99． 22% and reduce the number of capacitors by 75%．

Key words: successive approximation register, analog to digital conversion, capacitor array DAC, high energy-efficiency

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