Low-power ethanol sensor read-out circuit using a-InGaZnO TFTs

Bhawna Tiwari, Prabal Bhatnagar, Pydi Ganga Bahubalindruni, Pedro Barquinha

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

3 Citations (Scopus)

Abstract

This paper presents a low-power ethanol sensing read-out circuit using amorphous-Indium-Gallium-Zinc-Oxide thin-film transistors (a-InGaZnO TFTs). The read-out circuit is implemented with a proposed low-power high-speed ring oscillator (RO). The proposed RO employs bootstrapped pseudo-CMOS inverter, whose delay and power are reduced by using intermediate signals generated within the RO, hence, ensuring a high frequency of oscillations and low-power consumption. This design further ensures improved sensitivity of the readout circuit. To validate the proposed idea, 9-stage conventional low-power and proposed ROs have been designed and simulated using in-house a-InGaZnO TFT models at a supply voltage of 8V. Simulation results show that the proposed RO provides 11.8% improvement in the frequency of oscillations and 18.5% reduction in power consumption compared to the conventional design. Further, the proposed circuit has shown an improvement of 9% in the sensitivity compared to the conventional design. Therefore, this circuit finds potential application in read-out sensing systems.

Original languageEnglish
Title of host publication2020 IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISBN (Electronic)9781728133201
Publication statusPublished - 2020
Event52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020 - Virtual, Online
Duration: 10 Oct 202021 Oct 2020

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Volume2020-October
ISSN (Print)0271-4310

Conference

Conference52nd IEEE International Symposium on Circuits and Systems, ISCAS 2020
CityVirtual, Online
Period10/10/2021/10/20

Keywords

  • Low-power ring oscillator
  • Oxide TFTs
  • Read-out sensors

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