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Sensors 2015, 15(10), 25564-25576; doi:10.3390/s151025564

Design of a Humidity Sensor Tag for Passive Wireless Applications

1
School of Electrical and Electronic Engineering, East China JiaoTong University, Nanchang 330013, China
2
School of Mechatronic Engineering, East China JiaoTong University, Nanchang 330013, China
*
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 5 August 2015 / Revised: 21 September 2015 / Accepted: 29 September 2015 / Published: 7 October 2015
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [1185 KB, uploaded 7 October 2015]   |  

Abstract

This paper presents a wireless humidity sensor tag for low-cost and low-power applications. The proposed humidity sensor tag, based on radio frequency identification (RFID) technology, was fabricated in a standard 0.18 μm complementary metal oxide semiconductor (CMOS) process. The top metal layer was deposited to form the interdigitated electrodes, which were then filled with polyimide as the humidity sensing layer. A two-stage rectifier adopts a dynamic bias-voltage generator to boost the effective gate-source voltage of the switches in differential-drive architecture, resulting in a flat power conversion efficiency curve. The capacitive sensor interface, based on phase-locked loop (PLL) theory, employs a simple architecture and can work with 0.5 V supply voltage. The measurement results show that humidity sensor tag achieves excellent linearity, hysteresis and stability performance. The total power-dissipation of the sensor tag is 2.5 μW, resulting in a maximum operating distance of 23 m under 4 W of radiation power of the RFID reader. View Full-Text
Keywords: humidity sensor; complementary metal oxide semiconductor (CMOS); radio frequency identification (RFID); rectifier; sensor interface humidity sensor; complementary metal oxide semiconductor (CMOS); radio frequency identification (RFID); rectifier; sensor interface
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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MDPI and ACS Style

Wu, X.; Deng, F.; Hao, Y.; Fu, Z.; Zhang, L. Design of a Humidity Sensor Tag for Passive Wireless Applications. Sensors 2015, 15, 25564-25576.

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