A temperature control system for integrated resistive gas sensor arrays

Giuseppe Ferri; Nicola Guerrini; Vincenzo Stornelli

doi:10.1117/12.608075

30 June 2005 A temperature control system for integrated resistive gas sensor arrays

Giuseppe Ferri, Nicola Guerrini, Vincenzo Stornelli

Proceedings Volume 5837, VLSI Circuits and Systems II; (2005) https://doi.org/10.1117/12.608075
Event: Microtechnologies for the New Millennium 2005, 2005, Sevilla, Spain

Abstract

A temperature control system for integrated resistive gas sensor arrays is proposed. The circuit is a part of a portable system for ambient gas monitoring formed by a sensor array, the IC front-end, the temperature control system with the heater and the pattern recognition algorithm for the processing of the acquired data from the front-end. The sensors are arranged in order to detect a particular kind of gas among which CO₂, CH₄, H₂ and SO₂, through a 4-channel read-out front-end able to furnish the digital output signal. The temperature control is simplified by the presence of a second resistance matched with the sensor that operates as a thermal sensor. In this manner it is possible to control the sensor temperature without interference. The problem of the temperature control of the heater is reduced to the control of a resistance. The current (more generally the power) delivered to the heater resistance must be such that the temperature has to remain constant. This task is demanded to the second resistance, close to the heater one, that remains at the same temperature. Typically, such kinds of controls are implemented by topologies that maintain current sources or heater currents constant. In this work, the control circuit is able to maintain the power delivered to the heater resistance as constant.

Citation Download Citation

Giuseppe Ferri, Nicola Guerrini, and Vincenzo Stornelli "A temperature control system for integrated resistive gas sensor arrays", Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); https://doi.org/10.1117/12.608075

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