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Sensors 2015, 15(5), 11442-11453;

Design of an Embedded CMOS Temperature Sensor for Passive RFID Tag Chips

School of Electrical and Electronic Engineering, East China Jiaotong University, Nanchang 330013, China
School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 22 March 2015 / Accepted: 12 May 2015 / Published: 18 May 2015
(This article belongs to the Section Physical Sensors)
Full-Text   |   PDF [1048 KB, uploaded 18 May 2015]   |  


This paper presents an ultra-low embedded power temperature sensor for passive RFID tags. The temperature sensor converts the temperature variation to a PTAT current, which is then transformed into a temperature-controlled frequency. A phase locked loop (PLL)-based sensor interface is employed to directly convert this temperature-controlled frequency into a corresponding digital output without an external reference clock. The fabricated sensor occupies an area of 0.021 mm2 using the TSMC 0.18 1P6M mixed-signal CMOS process. Measurement results of the embedded sensor within the tag system shows a 92 nW power dissipation under 1.0 V supply voltage at room temperature, with a sensing resolution of 0.15 °C/LSB and a sensing accuracy of −0.7/0.6 °C from −30 °C to 70 °C after 1-point calibration at 30 °C. View Full-Text
Keywords: temperature sensor; RFID tag; CMOS process; phase-locked loop temperature sensor; RFID tag; CMOS process; phase-locked loop

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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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Deng, F.; He, Y.; Li, B.; Zhang, L.; Wu, X.; Fu, Z.; Zuo, L. Design of an Embedded CMOS Temperature Sensor for Passive RFID Tag Chips. Sensors 2015, 15, 11442-11453.

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