A complete front-end system for resistive gas sensor array is presented. The interface is composed by 8 read-out channels and by 2 closed-loop temperature control circuits. The IC gas sensor read-out structure is based on a controlled oscillator, which acts like a resistance-to-period converter, and achieves a 0.5%-linearity over 500kOhm-1GOhm sensor resistance range with a SNR better than 48dB, corresponding to 114dB-DR. The temperature control systems allows maintaining a 100�C gradient on the array of sensor, selected in the temperature range 100�C-400�C, with a �2.5�C accuracy. The full device is designed in a standard 0.35�m CMOS technology. The die area is 1.8mm2 with a total power consumption of 27mW from a single 3.3V supply voltage.

A High Dynamic Range CMOS Interface for Resistive Gas Sensor Array with Gradient Temperature Control

Malfatti, Mattia;Perenzoni, Matteo;Stoppa, David;Simoni, Andrea;Adami, Andrea
2006

Abstract

A complete front-end system for resistive gas sensor array is presented. The interface is composed by 8 read-out channels and by 2 closed-loop temperature control circuits. The IC gas sensor read-out structure is based on a controlled oscillator, which acts like a resistance-to-period converter, and achieves a 0.5%-linearity over 500kOhm-1GOhm sensor resistance range with a SNR better than 48dB, corresponding to 114dB-DR. The temperature control systems allows maintaining a 100�C gradient on the array of sensor, selected in the temperature range 100�C-400�C, with a �2.5�C accuracy. The full device is designed in a standard 0.35�m CMOS technology. The die area is 1.8mm2 with a total power consumption of 27mW from a single 3.3V supply voltage.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11582/3191
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