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
2006-01-01
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
