Battery-less Wireless Sensors Based on Low Power UHF RFID Tags

  1. Roc Berenguer 1
  2. Iván Rebollo 2
  3. Ibon Zalbide 2
  4. Iñaki Fernández 1
  1. 1 Universidad de Navarra
    info

    Universidad de Navarra

    Pamplona, España

    ROR https://ror.org/02rxc7m23

  2. 2 FARSENS S.L., Paseo Mikeletegi, 54, 20009, Donostia-San Sebastián, Spain
Liburua:
Wirelessly Powered Sensor Networks and Computational RFID

Argitaletxea: Springer

ISBN: 9781441961655,  9781441961662

Argitalpen urtea: 2013

Orrialdeak: 79 - 109

Mota: Liburuko kapitulua

DOI: 10.1007/978-1-4419-6166-2_5 GOOGLE SCHOLAR lock_openSarbide irekia editor

Laburpena

A long range UHF RFID tag suitable for battery-less wireless sensors is implemented. The main theoretical limitations involving maximum communication distance between the tag and the reader are discussed obtaining useful system design guidelines. Using these guidelines an analog front-end is designed in a low cost 0.35µm CMOS process. The proposed analog front-end together with the EPC C1G2 compatible digital core allow the implementation of power management techniques, that together with the power optimized blocks such as voltage limiter, band-gap, regulators, clock generator and ASK demodulator provide a long reading range. The implemented voltage multiplier uses Schottky diodes to provide ef?ciencies higher than 35%. The measured UHF RFID analog front-end current consumption is 7.4µA. A complete wireless sensory system is implemented assembling the analog front-end chip to a matched dipole antenna, to an ultra-low power commercial sensor and to a module based digital core (?eld-programmable gate array - FPGA - and digital core replica power consumption module). Measured results show a successful wireless communication up to 2.4m from a 2W EIRP output power reader to a digital module plus low power sensor (temperature, pressure, humidity, etc.) with average power consumption lower than 37.5µW. Temperature and acceleration prototypes have been built showing communication ranges of 2m and 1m respectively using a commercial reader. These characteristics allow the use of the proposed sensory system in a battery-less wireless sensor network.

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