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LPG Gas-Sensing System With SnO2 Thin-Film Transducer and 0.7-mu m CMOS Signal Conditioning ASIC

Bagga, Shobi and Bhat, Navakanta and Mohan, S (2009) LPG Gas-Sensing System With SnO2 Thin-Film Transducer and 0.7-mu m CMOS Signal Conditioning ASIC. In: IEEE Transactions on instrumentation and Measurement, 58 (10). pp. 3653-3658.

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The design and implementation of a complete gas sensor system for liquified petroleum gas (LPG) gas sensing are presented. The system consists of a SnO2 transducer, a lowcost heater, an application specific integrated circuit (ASIC) with front-end interface circuitry, and a microcontroller interface for data logging. The ASIC includes a relaxation-oscillator-based heater driver circuit that is capable of controlling the sensor operating temperature from 100degC to 425degC. The sensor readout circuit in the ASIC, which is based on the resistance to time conversion technique, has been designed to measure the gas sensor response over three orders of resistance change during its interaction with gases.

Item Type: Journal Article
Publication: IEEE Transactions on instrumentation and Measurement
Publisher: IEEE
Additional Information: Copyright 2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Application specific integrated circuit (ASIC);gas sensor interface circuit;heater driver;relaxation oscillator circuit;resistance to frequency conversion; tin oxide
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited: 13 Dec 2009 10:16
Last Modified: 19 Sep 2010 05:46
URI: http://eprints.iisc.ac.in/id/eprint/23655

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