A reconfigurable, low-cost, wide-dynamic-range, 0.35 mu m CMOS read-out ASIC for resistive bi-dimensional Metal-Oxide gas-sensor grids, providing local temperature regulation, has been developed. The MOX grid read-out circuit is based on a resistance to digital converter plus suitable low insertion loss analog multiplexers, delivering up to 380 possible measurement configurations for a 5x5 sensing device. Desired grid read-out sequences and temperature profiles, in time and in space, within the range [25 degrees C divided by 500 degrees C], may be executed by simply loading suitable configuration data onto embedded slave (IC)-C-2 registers. Without the aid of bulky calibration circuits the ASIC features 167dB dynamic range for sensor resistance value read-out with a guaranteed output rate of 1Hz, and an estimated accuracy, including ripple, better than 1 degrees C in each sensor row temperature regulation, while actuating the maximum temperature set-point transient in less than 30ms
Conso, F., Grassi, M., Malcovati, P., Baschirotto, A. (2012). Reconfigurable integrated wide-dynamic-range read-out circuit for MOX gas-sensor grids providing local temperature regulation. In 2012 IEEE SENSORS PROCEEDINGS (pp.1822-1825) [10.1109/ICSENS.2012.6411195].
Reconfigurable integrated wide-dynamic-range read-out circuit for MOX gas-sensor grids providing local temperature regulation
BASCHIROTTO, ANDREA
2012
Abstract
A reconfigurable, low-cost, wide-dynamic-range, 0.35 mu m CMOS read-out ASIC for resistive bi-dimensional Metal-Oxide gas-sensor grids, providing local temperature regulation, has been developed. The MOX grid read-out circuit is based on a resistance to digital converter plus suitable low insertion loss analog multiplexers, delivering up to 380 possible measurement configurations for a 5x5 sensing device. Desired grid read-out sequences and temperature profiles, in time and in space, within the range [25 degrees C divided by 500 degrees C], may be executed by simply loading suitable configuration data onto embedded slave (IC)-C-2 registers. Without the aid of bulky calibration circuits the ASIC features 167dB dynamic range for sensor resistance value read-out with a guaranteed output rate of 1Hz, and an estimated accuracy, including ripple, better than 1 degrees C in each sensor row temperature regulation, while actuating the maximum temperature set-point transient in less than 30msI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.