A 99.77% energy-reduced asymmetric capacitance switching scheme for SAR ADC with split-capacitor method

  • Jian Liu
  • Shubin Liu
  • Ruixue Ding
  • Zhangming Zhu
Mixed Signal Letter


A highly energy-efficient, highly area-efficient asymmetric capacitance switching scheme for successive approximation register (SAR) analog-to-digital converters (ADC) is presented. Based on the monotonic switching procedure and asymmetric capacitance array, the novel architecture achieves 97.65% reduction in capacitor area over the conventional SAR ADC. Besides, with the split-capacitor method and most significant bit split switching procedure, the proposed switching scheme achieves 99.77% less switching energy compared with the conventional switching method.


SAR ADC Energy efficiency Area efficiency Switching scheme Spilt-capacitor method Asymmetrical capacitance array 



This work was supported by the National Natural Science Foundation of China (Nos. 61674118, 61625403), National Science and Technology Major Project of China (No. 2016ZX03002007).


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Jian Liu
    • 1
  • Shubin Liu
    • 1
  • Ruixue Ding
    • 1
  • Zhangming Zhu
    • 1
  1. 1.School of MicroelectronicsXidian UniversityXi’anPeople’s Republic of China

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