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Sensors 2018, 18(3), 761; https://doi.org/10.3390/s18030761

A Three-Step Resolution-Reconfigurable Hazardous Multi-Gas Sensor Interface for Wireless Air-Quality Monitoring Applications

1
School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
2
School of Mechanical, Aerospace and Nuclear Engineering, Ulsan National Institute of Science and Technology, Ulsan 44919, Korea
*
Authors to whom correspondence should be addressed.
Received: 22 December 2017 / Revised: 22 February 2018 / Accepted: 1 March 2018 / Published: 2 March 2018
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents a resolution-reconfigurable wide-range resistive sensor readout interface for wireless multi-gas monitoring applications that displays results on a smartphone. Three types of sensing resolutions were selected to minimize processing power consumption, and a dual-mode front-end structure was proposed to support the detection of a variety of hazardous gases with wide range of characteristic resistance. The readout integrated circuit (ROIC) was fabricated in a 0.18 μm CMOS process to provide three reconfigurable data conversions that correspond to a low-power resistance-to-digital converter (RDC), a 12-bit successive approximation register (SAR) analog-to-digital converter (ADC), and a 16-bit delta-sigma modulator. For functional feasibility, a wireless sensor system prototype that included in-house microelectromechanical (MEMS) sensing devices and commercial device products was manufactured and experimentally verified to detect a variety of hazardous gases. View Full-Text
Keywords: heterogeneous gas; multi-sensor; reconfigurable resolution; readout integrated circuit (ROIC); wireless sensor interface; microelectromechanical (MEMS) device; suspended nanowire heterogeneous gas; multi-sensor; reconfigurable resolution; readout integrated circuit (ROIC); wireless sensor interface; microelectromechanical (MEMS) device; suspended nanowire
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Choi, S.; Park, K.; Lee, S.; Lim, Y.; Oh, B.; Chae, H.Y.; Park, C.S.; Shin, H.; Kim, J.J. A Three-Step Resolution-Reconfigurable Hazardous Multi-Gas Sensor Interface for Wireless Air-Quality Monitoring Applications. Sensors 2018, 18, 761.

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