In this paper a low-cost integrated wide-range gas sensor interface based on a resistance-to-time converter is presented. The circuit in transistor level simulation achieves a linearity better than 0.5% over a range of 6 decades i. e. 1 k Omega divided by 1 G Omega, without requiring any calibration or auto-ranging. The maximum sensing time is 0.5 s, while measuring the highest resistance value. The state-of-the-art of this measurement has been improved by extending the acceptable input resistance range, while lowering the maximum power consumption. Moreover, a very high linearity has been achieved by canceling the parasitic effects of the multiplexer addressing the sensor matrix
Conso, F., Grassi, M., Malcovati, P., Baschirotto, A. (2011). A very high dynamic range interface circuit for resistive gas sensor matrix read-out. In IEEE International Symposium on Circuits and Systems (ISCAS) (pp.2209-2212). IEEE [10.1109/ISCAS.2011.5938039].
A very high dynamic range interface circuit for resistive gas sensor matrix read-out
BASCHIROTTO, ANDREA
2011
Abstract
In this paper a low-cost integrated wide-range gas sensor interface based on a resistance-to-time converter is presented. The circuit in transistor level simulation achieves a linearity better than 0.5% over a range of 6 decades i. e. 1 k Omega divided by 1 G Omega, without requiring any calibration or auto-ranging. The maximum sensing time is 0.5 s, while measuring the highest resistance value. The state-of-the-art of this measurement has been improved by extending the acceptable input resistance range, while lowering the maximum power consumption. Moreover, a very high linearity has been achieved by canceling the parasitic effects of the multiplexer addressing the sensor matrix
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