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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 4??4 SnO2 gas sensor array. A unique pattern is generated by the readout scheme for each gas, irrespective of the...
This paper presents a 4times4 tin oxide gas sensor array based on spike sequence matching. This integrated CMOS compatible gas identification system generates a unique spike sequence, which is only function of the sensed gas. In contrast to previously reported gas classification schemes, the proposed signature is independent of gas concentration. Reported experimental results validate the functionality...
Post-treatment of the sensing film in tin oxide gas sensor arrays is widely used to improve the selectivity in gas recognition applications. This letter describes the characterization study of an integrated tin oxide gas sensor array chip in which the sensing films are modified using metal additives and ion implantations. Measurement results reveal that metal additives present a higher impact on the...
This paper presents a monolithic 4times4 tin oxide gas sensor array together with on-chip multiplexing and differential read-out circuitry. In contrast to the conventional voltage divider read-out technique, a novel differential read-out circuit (DRC) for tin oxide gas sensors is proposed. The output of the DRC is simply proportional to the difference between the voltage on the two electrodes of the...
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