题目/Title：A Combined Low Power SAR Capacitance-to-Digital/Analog-to-Digital Converter for Multisensory System

作者/Author：姜珲,王自强,刘力源,张春,王志华
                        Hui Jiang,Ziqiang Wang,Liyuan Liu,Chun Zhang,Zhihua Wang

会议/Conference：MWSCAS 2012

地点/Location：Boise, Idaho, USA

年份/Issue Date：2012.5-8 Aug.

页码/pages：pp. 1000 - 1003

摘要/Abstract：
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.