A 450- \mu A 128-dB Dynamic Range A/D CMOS Interface for MOX Gas Sensors

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...

Full description

Saved in:
Bibliographic Details
Published in:IEEE sensors journal 2019-12, Vol.19 (24), p.12069-12078
Main Authors: Ciciotti, Fulvio, Buffa, Cesare, Radogna, Antonio Vincenzo, Francioso, Luca, Capone, Simonetta, Gaggl, Richard, Baschirotto, Andrea
Format: Article
Language:English
Subjects:
CMOS
gas sensor
MOX
resistance-to-frequency
sensor interface
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 100Ω-1MΩ 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 μm 2 and 450μA-Total Current from a single 1.5V supply. Electrical and chemical measurements with a SnO 2 sensor validate the results, showing high minimum CO detection capability in ambient air of 5ppm.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2019.2939615