Title :
A 160 dB Equivalent Dynamic Range Auto-Scaling Interface for Resistive Gas Sensors Arrays
Author :
Grassi, Marco ; Malcovati, Piero ; Baschirotto, Andrea
Author_Institution :
Dept. of Electr. Eng., Pavia Univ., Pavia, Italy
fDate :
3/1/2007 12:00:00 AM
Abstract :
In this paper an integrated wide-dynamic-range interface circuit for resistive gas-sensors arrays is presented. The proposed device consists of a multiscale transresistance continuous time amplifier followed by a 13-bit incremental A/D converter. The circuit selects automatically the scale to use for each measurement and includes two digital-to-analog converters for the calibration of offset and gain of each scale. The proposed interface circuit achieves a measurement accuracy almost always better than 0.1 % over a sensor resistance range of more than 5 decades [100 Omega-20 MOmega], leading to an equivalent dynamic range of about 160 dB. The chip has been realized with a 0.35 mum CMOS technology and occupies an area of 3.1 mm2 consuming 6 mW from a 3.3 V power supply.
Keywords :
CMOS integrated circuits; amplifiers; analogue-digital conversion; digital-analogue conversion; gas sensors; mixed analogue-digital integrated circuits; sensor arrays; 0.35 micron; 100 ohm; 13 bit; 20 Mohm; 3.3 V; 6 mW; A/D converter; CMOS technology; digital-to-analog converters; gas sensor interface; interface circuit; mixed analog digital IC; multiscale transresistance continuous time amplifier; resistance-to-number; resistive gas sensors arrays; CMOS technology; Calibration; Digital-analog conversion; Dynamic range; Electrical resistance measurement; Gain measurement; Gas detectors; Integrated circuit measurements; Semiconductor device measurement; Sensor arrays; Gas sensor interface; mixed analog digital IC; resistance-to-number;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2006.891724