期刊
IEEE SENSORS JOURNAL
卷 20, 期 20, 页码 12262-12273出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.2999332
关键词
Capacitive sensors; Capacitance; Sensor phenomena and characterization; Intelligent sensors; Power demand; Transistors; Ambient intelligence; C2V; capacitive sensor; charge-sensitive amplifier; CMOS; current source; environmental sensor; force sensor; humidity sensor; interface circuit; Internet-of-Things (IoT); light sensor; proximity sensor; resistive sensor; switched capacitor circuit; ultra-low-power
资金
- Naked Approach [40336/14, 3246/31/2014]
- Towards Digital Paradise Project [2727/31/2016]
- Business Finland
- LightningSense project - Academy of Finland [319043]
- Aalto ELEC Doctoral School Grant - Aalto University School of Electrical Engineering
- Academy of Finland (AKA) [319043, 319043] Funding Source: Academy of Finland (AKA)
This paper presents an ultra-low-power, wide-dynamic-range interface circuit for capacitive and resistive sensors. The circuit is implemented as a switched-capacitor circuit using programmable capacitors to achieve high configurability. The circuit was fabricated using a CMOS 0.18 mu m process. Different types of capacitive and resistive sensors were measured using the interface to demonstrate its support for multi-sensor systems with an ultra-low-power budget. Experimental results show that the circuit is able to interface various sensors within the overall capacitance range of 0.6-550 pF and resistance range of 3.7-5100 k Omega , while consuming only 0.39-3.56 mu W from a 1.2 V supply. A proximity, gesture, and touch-sensing system is also developed consisting of the designed interface circuit and a sensor element that is able to detect the displacement of an object up to 15 cm from the sensing electrodes consuming only 0.83 mu W from a 1.2 V supply.
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