A compact low-power UHF RFID tag

Ashry, A.; Sharaf, K.; Ibrahim, Magdy A.

doi:10.1016/j.mejo.2009.01.013

Cited by 33 publications

(9 citation statements)

References 3 publications

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“…Demodulation is performed by the envelope detector circuit and the comparator that extracts the RF envelope into pulse train digital signal [3]. This signal has to be decoded into the actual binary information.…”

Section: B Modulation/demodulationmentioning

confidence: 99%

RFID UHF protocol implementation in distributed sensor networks

Broz

Bako

Butkovic

et al. 2015

2015 38th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)

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In today's market significant segment is taken by the applications using sensors to track physical events in the surrounding environment. Market raise is particularly related to the distributed sensor networks based on the wireless communications (like Internet of Things IoT devices). One of the hardest challenges in this field is associated with the power supply requirements. Battery operated electronics is limited by the battery capacity and battery lifetime. This paper proposes solution based on the RFID EPC-Gen2-protocol-based readers supplying power to the sensor nodes, consisting of the microelectronic circuit and the associated sensor. Besides the power, RFID protocol provides means of wireless communication, without the need for the battery supply on the sensor node side. Analogue circuits for receiving and demodulating RF ASK modulated signal from the reader, and transmitting back the signal to the reader using backscattering technique, are presented. Subset of the command protocol is implemented to support data communication including sensor identification through the unique ID code and sensor reading in the form of the digital word provided by the on-chip ADC. RTL description for digital control is developed in VHDL and synthesized. The prototype is processed in UMC Mixed-Mode/RF 180 nm technology.

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Section: B Modulation/demodulationmentioning

confidence: 99%

RFID UHF protocol implementation in distributed sensor networks

Broz

Bako

Butkovic

et al. 2015

2015 38th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)

View full text Add to dashboard Cite

show abstract

“…In UHF RFID systems, since passive tags have no internal power supply, the internal clock used in the tag is extracted from the incoming RF signal. For generating the internal clock, a relaxation or a ring oscillator is generally used [19]. These oscillators are efficient in backscattering performance; however, have heavy phase noise.…”

Section: Frequency Deviationmentioning

confidence: 99%

A Robust Baseband Demodulator for ISO 18000-6C RFID Reader Systems

Cheng

Cho

2012

International Journal of Distributed Sensor Networks

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One key challenge for ultra-high frequency (UHF) radio-frequency identification (RFID) reader design is to demodulate the weak tag response signal which tends to be easily distorted and has considerable frequency deviations. In this paper, a baseband demodulator based on a matched filter (MF) is proposed to enhance the reliability of signal processing for the EPCglobal Class-1 Generation-2 (Gen2) RFID reader systems. The proposed demodulator is very robust against strong signal distortions and large frequency deviations happening on the received backscattered signal from a passive RFID tag. The validity and usefulness is demonstrated by both computer simulations and implementation experiments.

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“…In the case of two data streams symmetrically transmitted between reader and card (illustrated in figure 2), bitrate could be doubled. Another research field is the full-duplex for UHF RFID, first demonstrated in 2009 by Ashri and Sharafa at 900 MHz [8], then at 7,9 GHz by Pelissier and Gomez in 2010 with a 112 Mbit/s bitrate [6]. The Skywork company now provides full-duplex UHF RFID chips [7] by separating frequency band for transmitting and receiving the information at respectively 5.8 GHz and 2.4 GHz.…”

Section: A Full-duplex Descriptionmentioning

confidence: 99%

A true full-duplex communication between HF contactless reader and card

Pebay-Peyroula

Reverdy

2011

2011 IEEE International Conference on RFID-Technologies and Applications

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This paper presents a full-duplex communication for high-frequency RFID at 13.56 MHz. The work presented in this study is based on the ISO 14443 very high bitrate (VHBR) modulations, which are defined for a half-duplex communication scheme. Moreover, these modulations appear to be orthogonal when transmitted simultaneously over the same carrier. The aim of this system is to use the VHBR modulations in a full-duplex scheme to double the global bitrate.The innovation presented in this paper improves the system performances without decreasing the transmission robustness, and without modifying neither the modulators nor the demodulation blocks.

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A compact low-power UHF RFID tag

Cited by 33 publications

References 3 publications

RFID UHF protocol implementation in distributed sensor networks

RFID UHF protocol implementation in distributed sensor networks

A Robust Baseband Demodulator for ISO 18000-6C RFID Reader Systems

A true full-duplex communication between HF contactless reader and card

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