A differential readout circuit for tin oxide gas sensor array

B. Guo, A. Bermak

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A novel differential readout circuit (DRC) for tin oxide gas sensors is proposed. The DRC consists of a differential readout unit (DRU), a voltage shifter (VS) and an instrumental amplifier. The DRU applies a constant current to drive the sensor and uses a unit-gain single stage amplifier (inverter) to generate the fully differential output, directly from the voltage drop across the sensor. By tuning the biasing current of the voltage shifter, the DRC can compensate for the sensor's baseline and its drift. The output of the DRC is simply proportional to the difference between the sensing signal and the baseline. Simulation results show that the DRC can sense and amplify 0-20MΩ sensor's resistance variation, which is often encountered in gas sensor applications. The output presents a linear dependence with the resistance variation of the sensor over the entire dynamic region. The proposed DRC provides increased signal to noise ratio over conventional single-ended voltage divider readout methods.

Original languageEnglish
Title of host publication2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages635-638
Number of pages4
ISBN (Print)0780393392, 9780780393394
DOIs
Publication statusPublished - 1 Jan 2005
Event2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC - Howloon, Hong Kong
Duration: 19 Dec 200521 Dec 2005

Publication series

Name2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC

Other

Other2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC
CountryHong Kong
CityHowloon
Period19/12/0521/12/05

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials

Cite this

Guo, B., & Bermak, A. (2005). A differential readout circuit for tin oxide gas sensor array. In 2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC (pp. 635-638). [1635354] (2005 IEEE Conference on Electron Devices and Solid-State Circuits, EDSSC). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/EDSSC.2005.1635354