A CMOS single-chip gas recognition circuit for metal oxide gas sensor arrays

Kwan Ting Ng, Farid Boussaid, Amine Bermak

Research output: Contribution to journalArticle

57 Citations (Scopus)


This paper presents a CMOS single-chip gas recognition circuit, which encodes sensor array outputs into a unique sequence of spikes with the firing delay mapping the strength of the stimulation across the array. The proposed gas recognition circuit examines the generated spike pattern of relative excitations across the population of sensors and looks for a match within a library of 2-D spatio-temporal spike signatures. Each signature is drift insensitive, concentration invariant and is also a unique characteristic of the target gas. This VLSI friendly approach relies on a simple spatio-temporal code matching instead of existing computationally expensive pattern matching statistical techniques. In addition, it relies on a novel sensor calibration technique that does not require control or prior knowledge of the gas concentration. The proposed gas recognition circuit was implemented in a 0.35 μm CMOS process and characterized using an in-house fabricated 4 × 4 tin oxide gas sensor array. Experimental results show a correct detection rate of 94.9% when the gas sensor array is exposed to propane, ethanol and carbon monoxide.

Original languageEnglish
Article number5766791
Pages (from-to)1569-1580
Number of pages12
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Issue number7
Publication statusPublished - 2011
Externally publishedYes



  • 'CMOS technology
  • drift
  • gas recognition
  • gas sensor array
  • tin oxide

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this