Reconfigurable Sensor Analog Front-End Using Low-Noise Chopper-Stabilized Delta-Sigma Capacitance-to-Digital Converter

作     者：Kim, Hyungseup Lee, Byeoncheol Mun, Yeongjin Kim, Jaesung Han, Kwonsang Roh, Youngtaek Song, Dongkyu Huh, Seounghoon Ko, Hyoungho 

作者机构：Chungnam Natl Univ Dept Elect Engn Daejeon 34134 South Korea LeoLSI Co Ltd Seoul 06728 South Korea 

出 版 物：《MICROMACHINES》 (微型机械)

年 卷 期：2018年第9卷第7期

页      面：347-347页

核心收录：

学科分类：08[工学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 

基　　金：LeoLSI Co., Ltd IC Design Education Center (IDEC) 

主　　题：capacitive microsensor analog front-end (AFE) capacitive sensor interface circuit reconfigurable sensor readout circuit delta-sigma modulation capacitance-to-digital converter (CDC) temperature sensor low-noise technique chopper stabilization 

摘      要：This paper proposes a reconfigurable sensor analog front-end using low-noise chopper-stabilized delta-sigma capacitance-to-digital converter (CDC) for capacitive microsensors. The proposed reconfigurable sensor analog front-end can drive both capacitive microsensors and voltage signals by direct conversion without a front-end amplifier. The reconfigurable scheme of the front-end can be implemented in various multi-mode applications, where it is equipped with a fully integrated temperature sensor. A chopper stabilization technique is implemented here to achieve a low-noise characteristic by reducing unexpected low-frequency noises such as offsets and flicker noise. The prototype chip of the proposed sensor analog front-end is fabricated by a standard 0.18-mu m 1-poly-6-metal (1P6M) complementary metal-oxide-semiconductor (CMOS) process. It occupies a total active area of 5.37 mm(2) and achieves an effective resolution of 16.3-bit. The total power consumption is 0.843 mW with a 1.8 V power supply.