RC-Oscillator-Based Battery-Less Wireless Sensing System Using RF Resonant Electromagnetic Coupling

DOI Web Site
  • LI Zixuan
    Nano Sensing Unit, Institute of Innovative Research, Tokyo Institute of Technology
  • LEE Sangyeop
    Nano Sensing Unit, Institute of Innovative Research, Tokyo Institute of Technology
  • ISHIHARA Noboru
    Nano Sensing Unit, Institute of Innovative Research, Tokyo Institute of Technology
  • ITO Hiroyuki
    Nano Sensing Unit, Institute of Innovative Research, Tokyo Institute of Technology

抄録

<p>A wireless sensor terminal module of 5cc size (2.5cm × 2.5cm × 0.8cm) that does not require a battery is proposed by integrating three kinds of circuit technologies. (i) a low-power sensor interface: an FM modulation type CMOS sensor interface circuit that can operate with a typical power consumption of 24.5μW was fabricated by the 0.7-μm CMOS process technology. (ii) power supply to the sensor interface circuit: a wireless power transmission characteristic to a small-sized PCB spiral coil antenna was clarified and applied to the module. (iii) wireless sensing from the module: backscatter communication technology that modulates the signal from the base terminal equipment with sensor information and reflects it, which is used for the low-power sensing operation. The module fabricated includes a rectifier circuit with the PCB spiral coil antenna that receives wireless power transmitted from base terminal equipment by electromagnetic resonance coupling and converts it into DC power and a sensor interface circuit that operates using the power. The interface circuit modulates the received signal with the sensor information and reflects it back to the base terminal. The module could achieve 100mm communication distance when 0.4mW power is feeding to the sensor terminal.</p>

収録刊行物

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ