This paper presents a fast high-linearity low-power versatile interface circuit for MOX gas sensor. The device is based on a resistance-to-frequency converter with digital output, featuring 128dB-Dynamic Range with 8-bit accuracy. This is achieved with a constant measurement time of 250ms (i.e. with 4Hz output data-rate). The ASIC covers the $100\Omega $ -1M $\Omega $ resistive range, with large programmability for the sensor resistance values. Large linearity (no glitches) is achieved with a single-scale measurement arrangement. The design effort reduces the power consumption to fit portable devices applications. The interface is realized in a standard CMOS 130nm technology with an area of $125000~\mu \text{m}^{2}$ and $450~\mu \text{A}$ -Total Current from a single 1.5V supply. Electrical and chemical measurements with a SnO2 sensor validate the results, showing high minimum CO detection capability in ambient air of 5ppm.
Ciciotti, F., Buffa, C., Radogna, A., Francioso, L., Capone, S., Gaggl, R., et al. (2019). A 450-μ A 128-dB Dynamic Range A/D CMOS Interface for MOX Gas Sensors. IEEE SENSORS JOURNAL, 19(24), 12069-12078 [10.1109/JSEN.2019.2939615].
A 450-μ A 128-dB Dynamic Range A/D CMOS Interface for MOX Gas Sensors
Ciciotti F.
;Baschirotto A.
2019
Abstract
This paper presents a fast high-linearity low-power versatile interface circuit for MOX gas sensor. The device is based on a resistance-to-frequency converter with digital output, featuring 128dB-Dynamic Range with 8-bit accuracy. This is achieved with a constant measurement time of 250ms (i.e. with 4Hz output data-rate). The ASIC covers the $100\Omega $ -1M $\Omega $ resistive range, with large programmability for the sensor resistance values. Large linearity (no glitches) is achieved with a single-scale measurement arrangement. The design effort reduces the power consumption to fit portable devices applications. The interface is realized in a standard CMOS 130nm technology with an area of $125000~\mu \text{m}^{2}$ and $450~\mu \text{A}$ -Total Current from a single 1.5V supply. Electrical and chemical measurements with a SnO2 sensor validate the results, showing high minimum CO detection capability in ambient air of 5ppm.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
