Energy-efficient switching scheme for ultra-low voltage SAR ADC

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• 作者：Aidong Wu ; Jianhui Wu ; Jun Huang
• 关键词：SAR ADC ; Ultra ; low voltage ; Switching scheme ; Floating capacitor ; LSB ; down
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：90
• 期：2
• 页码：507-511
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems; Electrical Engineering; Signal,Image and Speech Processing;
• 出版者：Springer US
• ISSN：1573-1979
• 卷排序：90

文摘

An energy-efficient capacitor switching scheme for ultra-low voltage successive approximation register (SAR) analog-to-digital converter (ADC) is proposed. The novel switching scheme uses two reference levels, which eliminates the dependency on the accuracy of the extra reference voltage (V_cm). In addition, the proposed scheme combines merge-and-split (MS) switching method, floating switching method and LSB-down switching method. More switching energy is saved with switching energy optimization before the third comparison, and the number of capacitors in the capacitor array is also reduced by 75% due to LSB-down switching method. The proposed scheme achieves a 98.4% reduction in switching energy when compared with the conventional SAR architecture.