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

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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.
Original languageEnglish
Article number9106395
Pages (from-to)12262-12273
Number of pages12
JournalIEEE Sensors Journal
Volume20
Issue number20
Early online date2 Jun 2020
DOIs
Publication statusPublished - 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Capacitive sensors
  • CMOS
  • Force sensor
  • Humidity sensor
  • Interface circuits
  • Internet of Things (IoT)
  • gesture detection
  • Resistive sensors
  • Switched capacitor circuits
  • Ultra low power

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