A 0.39–3.56-μW Wide-Dynamic-Range Universal Multi-Sensor Interface Circuit

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2020-10-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
12
12262-12273
Series
IEEE Sensors Journal, Volume 20, issue 20
Abstract
This paper presents an ultra-low-power, widedynamic- 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 μm 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 , while consuming only 0.39–3.56 μW 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 μW from a 1.2 V supply.
Description
Keywords
Capacitive sensors, CMOS, Force sensor, Humidity sensor, Interface circuits, Internet of Things (IoT), gesture detection, Resistive sensors, Switched capacitor circuits, Ultra low power
Other note
Citation
Moayer , M M , Salomaa , J & Halonen , K 2020 , ' A 0.39–3.56-μW Wide-Dynamic-Range Universal Multi-Sensor Interface Circuit ' , IEEE Sensors Journal , vol. 20 , no. 20 , 9106395 , pp. 12262-12273 . https://doi.org/10.1109/JSEN.2020.2999332