Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 189, Issue -, Pages 130-140Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2013.02.014
Keywords
Bridge-based circuits; Fully-analog interfaces; Uncalibrated analog circuit; Wheatstone bridge; Wide-range resistive sensors; Voltage controlled resistor, VCR
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In this paper a novel fully-analog uncalibrated Wheatstone bridge-based topology suitable for wide-range resistive sensors estimation is presented. The proposed interface is an improvement of a work recently proposed by the authors, showing an increase of the operative dynamic range and both system accuracy and sensitivity. Thanks to the use of a simple closed feedback loop, based on an instrumentation amplifier and an inverting integrator, it is possible to easily set two voltage controlled resistor (VCR) values, so to maintain the bridge balancing condition in the case of sensor variation. The use of this configuration allows the sensor estimation for about 6 decades resistive variation (10 Omega-8 M Omega) with a very high accuracy for a wide-range sensor interface (absolute relative error within +/- 2%). Experimental tests, performed by using a commercial resistive sensor, have shown that, thanks to its high sensitivity value, the interface can reveal and correctly quantify both few ppm carbon monoxide (CO) particles and percentage relative humidity (RH%) variations. (C) 2013 Elsevier B.V. All rights reserved.
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