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Design and Implementation of a RF Powering Circuit for RFID Tags or Other Batteryless Embedded Devices
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R
K
郭
DOI：10.3390/s140814839.png)
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Abstract
En 中文
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 mu m process, this regulator achieves 0.04 mV/degrees 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 mu m process. The area of the RF powering circuit is 0.23 x 0.24 mm(2). The RF powering circuit is successfully integrated with ISO/IEC 15693-compatible and ISO/IEC 14443-compatible RFID tag chips.
Keywords:
batteryless embedded devices
wireless sensor network
RFID tag chip
rectifier
regulator
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