Uncalibrated Current-Mode Oscillator For Resistive Gas Sensor Integrable Applications
Giuseppe Ferri, Vincenzo Stornelli, Andrea De Marcellis, Claudia Di Carlo, Alessandra Flammini, Alessandro Depari, D. Marioli, Matteo Pardo, Giorgio Sberveglieri · AIP conference proceedings · 2009
We present a novel current‐mode fully‐integrable oscillating circuit for the interfacing of resistive gas sensors, using a reduced number of active blocks, in particular low voltage low power Second Generation Current Conveyors (CCIIs), to be used in portable applications. The proposed front‐end, operating a Resistance‐to‐Time (R−T) conversion, can be utilized for AC‐excited resistive sensors and does not need any initial calibration. Simulation and preliminary measurement results on a prototype board performed on the whole system have shown good linearity and agreement with theoretical expectations.