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Characterization of a Logarithmic Spike Timing Encoding Scheme for a 4×4 tin Oxide Gas Sensor Array

Authors Ng, Kwan Ting
Guo, Bin
Bermak, Amine View this author's profile
Martinez, Dominique
Boussaid, Farid
Issue Date 2009
Source Proceedings of IEEE Sensors , 2009, p. 731-734
Summary In this paper, the performance of a logarithmic spike timing encoding scheme for gas sensor is analyzed. Utilizing the non-linear (power law) relationship between tin oxide (SnO2) gas sensor sensitivity and gas concentration, we designed and fabricated a time domain readout circuit for a 4x4 SnO2 gas sensor array. A unique pattern is generated by the readout scheme for each gas, irrespective of the gas concentration. This pattern is used as the signature of the gas. Gas identification is achieved by matching the generated signature with pre-stored reference signatures. The design was implemented in standard CMOS technology. Reported experimental results demonstrate the fabricated gas sensor exhibits the detection accuracy comparable to computationally expensive classifiers. ©2009 IEEE.
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Language English
Format Conference paper
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