Title :
A High Dynamic Range CMOS Interface for Resistive Gas Sensor Array with Gradient Temperature Control
Author :
Malfatti, Mattia ; Perenzoni, Matteo ; Stoppa, David ; Simoni, Andrea ; Adami, Andrea
Author_Institution :
Microsystems Div., Center for Sci. & Technol. Res., Trento
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 500 kOmega-1 GOmega sensor resistance range with a SNR better than 48 dB, corresponding to 114 dB-DR. The temperature control systems allows maintaining a 100degC gradient on the array of sensor, selected in the temperature range 100degC-400degC, with a plusmn2.5degC accuracy. The full device is designed in a standard 0.35 mum CMOS technology. The die area is 1.8 mm2 with a total power consumption of 27 mW from a single 3.3 V supply voltage
Keywords :
CMOS integrated circuits; gas sensors; temperature control; 100 to 400 C; 27 mW; 3.3 V; CMOS interface; CMOS technology; IC gas sensor read-out structure; closed-loop temperature control circuits; controlled oscillator; front-end system; gradient temperature control; power consumption; read-out channels; resistance measurement; resistance-to-period converter; resistive gas sensor array; sensor resistance; CMOS technology; Circuits; Dynamic range; Gas detectors; Oscillators; Sensor arrays; Sensor systems; Temperature control; Temperature distribution; Temperature sensors; Front-end; Gas sensor array; Resistance measurement; Temperature control;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2006. IMTC 2006. Proceedings of the IEEE
Conference_Location :
Sorrento
Print_ISBN :
0-7803-9359-7
Electronic_ISBN :
1091-5281
DOI :
10.1109/IMTC.2006.328398
