A charge-sharing switching scheme for SAR ADCs in biomedical applications

作者：Zhang, Yanbo; Li, Yani; Zhu, Zhangming^*

来源：MICROELECTRONICS JOURNAL, 2018, 75: 128-136.

DOI：10.1016/j.mejo.2018.04.003

• SAR ADC
• Switching scheme
• Charge sharing
• Dummy capacitor
• Split-MSB

This paper presents a charge-sharing switching scheme for successive approximation register (SAR) analog-to-digital converters (ADCs) in biomedical applications. By using the charge sharing between two capacitor arrays to generate binary-weighted voltage-changes sequentially on the dummy capacitor, which is used to compare the multiple low bits, the proposed switching method enhances the efficiency of switching energy by 99.51% and achieves a 93.55% reduction in the total capacitor size, compared with the conventional SAR ADC.

• 出版日期2018-5
• 单位西安电子科技大学