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Sensors 2014, 14(8), 14839-14857; https://doi.org/10.3390/s140814839

Design and Implementation of a RF Powering Circuit for RFID Tags or Other Batteryless Embedded Devices

School of Optical and Electronic Information, Huazhong University of Science & Technology, Wuhan 430074, China
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Received: 20 January 2014 / Revised: 5 August 2014 / Accepted: 6 August 2014 / Published: 13 August 2014
(This article belongs to the Section Physical Sensors)
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Abstract

A RF powering circuit used in radio-frequency identification (RFID) tags and other batteryless embedded devices is presented in this paper. The RF powering circuit harvests energy from electromagnetic waves and converts the RF energy to a stable voltage source. Analysis of a NMOS gate-cross connected bridge rectifier is conducted to demonstrate relationship between device sizes and power conversion efficiency (PCE) of the rectifier. A rectifier with 38.54% PCE under normal working conditions is designed. Moreover, a stable voltage regulator with a temperature and voltage optimizing strategy including adoption of a combination resistor is developed, which is able to accommodate a large input range of 4 V to 12 V and be immune to temperature variations. Latch-up prevention and noise isolation methods in layout design are also presented. Designed with the HJTC 0.25 μm process, this regulator achieves 0.04 mV/°C temperature rejection ratio (TRR) and 2.5 mV/V voltage rejection ratio (VRR). The RF powering circuit is also fabricated in the HJTC 0.25 μm process. The area of the RF powering circuit is 0.23 × 0.24 mm2. The RF powering circuit is successfully integrated with ISO/IEC 15693-compatible and ISO/IEC 14443-compatible RFID tag chips. View Full-Text
Keywords: batteryless embedded devices; wireless sensor network; RFID tag chip; rectifier; regulator batteryless embedded devices; wireless sensor network; RFID tag chip; rectifier; regulator
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Liu, D.; Wang, R.; Yao, K.; Zou, X.; Guo, L. Design and Implementation of a RF Powering Circuit for RFID Tags or Other Batteryless Embedded Devices. Sensors 2014, 14, 14839-14857.

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