In this paper an interface circuit for MOX gas sensor is presented. It is based on a resistance-to-frequency converter and improves existing solutions in term of performance (offset) and power efficiency. The resistive range covered is 100Ω-1MΩ, with an equivalent 8-bit precision in a total measurement time of 1 second. This corresponds to a dynamic range of about 128dB. Power consumption and design strategy are optimized for mass production targeting consumer applications. The interface is implemented in a standard CMOS 130nm technology with an area of 125000 μm2 and 450μA of current consumption.
Ciciotti, F., Baschirotto, A., Buffa, C., Gaggl, R. (2017). A MOX gas sensors resistance-to-digital CMOS interface with 8-bits resolution and 128dB dynamic range for low-power consumer applications. In PRIME 2017 - 13th Conference on PhD Research in Microelectronics and Electronics, Proceedings (pp.21-24). 345 E 47TH ST, NEW YORK, NY 10017 USA : Institute of Electrical and Electronics Engineers Inc. [10.1109/PRIME.2017.7974097].
A MOX gas sensors resistance-to-digital CMOS interface with 8-bits resolution and 128dB dynamic range for low-power consumer applications
CICIOTTI, FULVIOPrimo
;BASCHIROTTO, ANDREASecondo
;
2017
Abstract
In this paper an interface circuit for MOX gas sensor is presented. It is based on a resistance-to-frequency converter and improves existing solutions in term of performance (offset) and power efficiency. The resistive range covered is 100Ω-1MΩ, with an equivalent 8-bit precision in a total measurement time of 1 second. This corresponds to a dynamic range of about 128dB. Power consumption and design strategy are optimized for mass production targeting consumer applications. The interface is implemented in a standard CMOS 130nm technology with an area of 125000 μm2 and 450μA of current consumption.
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