An Ultra-Low-Power Read-Out Circuit for Interfacing Novel Gas Sensors Matrices
(2022) IEEE Sensors Journal — Vol. 22, n° 10, p. 9521-9533 (2022)
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- Abstract
- New gas sensing materials, like conductive polymers and nanomaterials-based composites, together with integrated circuit advancements have enabled a new paradigm in gas sensing where a matrix of different types of sensors is used to improve selectivity and sensitivity. In this paper we present a highly flexible read-out circuit for acquiring the dc resistance of the sensors in the matrix. It can measure values from 1 kΩ up to 33 MΩ , with a minimum SNR of 57 dB. It also offers a wide range of input configuration in terms of resistance and bias voltages to select the optimal bias point for each sensor and to accommodate a large range of sensor types. It achieves very low power consumption at a maximum current consumption of 194 μA and an energy per conversion ranging from 1.21 nJ up to 188 nJ thanks to the optimization of the frequency of operation. The circuit was fabricated in a 180 nm bulk CMOS process and a complete characterization of the circuit is presented including current consumption, signal-to-noise ratio, and transfer function. Finally, the circuit was tested in a real application for the measurement of NH 3 and NO 2 using two different types of sensors validating the design objectives and the capability of the read-out circuit for system-on-chip integrations.
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Citations
Puyol Troisi, R., Pétré, S., Danlée, Y., Walewyns, T., Francis, L., & Flandre, D. (2022). An Ultra-Low-Power Read-Out Circuit for Interfacing Novel Gas Sensors Matrices. IEEE Sensors Journal, 22(10), 9521-9533. https://doi.org/10.1109/JSEN.2022.3165755 (Original work published 2022)