Ultra-Low-Power Front-end Design on Flexible IC Technology for Capacitive Sensors

Muhammad Tanweer*, Dipesh C. Monga, Kari Halonen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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Abstract

This paper presents an application-specific integrated circuit (ASIC) front-end, to interface the printed capacitive sensors, using an amorphous Indium-Gallium-Zinc-Oxide (a-IGZO) thin film transistors (TFT) on flexible integrated circuit (FlexIC) technology. A ring oscillator (RO) based front-end sensor interface is designed with 0.024 mm2 area using 600 nm channel length of n-type TFTs consuming 183 nW at a supply voltage of 1 V. It generates output frequency sensitive to the change in the input capacitance of the printed coplanar sensor introduced by the moisture variations. Measurement results show that the front-end ASIC can detect the change in capacitance from 10 pF up to 500 pF of the printed coplanar sensor making it suitable not only for moisture detection but also for the evaluation of voided liquid volumes inside diapers to realize economical, disposable and battery-less Internet of Things (IoT) sensor nodes using green energy harvested from urine.

Original languageEnglish
Title of host publicationFLEPS 2024 - IEEE International Conference on Flexible and Printable Sensors and Systems, Proceedings
PublisherIEEE
Number of pages4
ISBN (Electronic)979-8-3503-8326-3
DOIs
Publication statusPublished - 2024
MoE publication typeA4 Conference publication
EventIEEE International Conference on Flexible and Printable Sensors and Systems - Tampere, Finland
Duration: 30 Jun 20243 Jul 2024
Conference number: 6

Publication series

NameIEEE international conference on flexible and printable sensors and systems
ISSN (Electronic)2832-8256

Conference

ConferenceIEEE International Conference on Flexible and Printable Sensors and Systems
Abbreviated titleFLEPS
Country/TerritoryFinland
CityTampere
Period30/06/202403/07/2024

Keywords

  • Disposable electronics
  • Energy harvesting
  • Flexible electronics
  • IoT sensor node
  • Printed electronics
  • Printed Sensors
  • Ultra-low-power

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