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A combined low power SAR capacitance-to-digital / analog-to-digital converter for multisensory system

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5 Author(s)
Hui Jiang ; Institute of Microelectronics, Tsinghua University, Beijing, China ; Ziqiang Wang ; Liyuan Liu ; Chun Zhang
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A low power interface circuit for multisensory system is presented in this paper. A SAR capacitance-to-digital converter (CDC) and a SAR analog-to-digital converter (ADC) are combined together so that capacitance or voltage from different sensors can be measured by the same circuit and converted to digital signal directly. A dynamic comparator with self-calibration is designed to achieve zero-static power. Bootstrapped switches and bottom-plate sampling are used to reduce the non-idealities of sample/hold circuit. The 11bit converter is designed in 0.18um CMOS process with a core area of 0.1764 mm2. It consumes 6.7μW and achieves an energy efficiency of 18.8 fJ/conversion-step as a CDC.

Published in:

2012 IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS)

Date of Conference:

5-8 Aug. 2012