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A 950-MHz rectifier circuit for sensor network tags with 10-m distance

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6 Author(s)
T. Umeda ; Mobile Commun. Lab., Corp. R&D Center, Kawasaki, Japan ; H. Yoshida ; S. Sekine ; Y. Fujita
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This paper presents a 950-MHz wireless power transmission system and a high-sensitivity rectifier circuit for ubiquitous sensor network tags. The wireless power transmission offers a battery-life-free sensor tag by recharging the output power of a base station into a secondary battery implemented with the tag. For realizing the system, a high-sensitivity rectifier with dynamic gate-drain biasing has been developed in a 0.3-μm CMOS process. The measurement results show that the proposed rectifier can recharge a 1.2-V secondary battery over -14-dBm input RF power at a power conversion efficiency of 1.2%. In the proposed wireless system, this sensitivity corresponds to 10-m distance communication at 4-W output power from a base station.

Published in:

IEEE Journal of Solid-State Circuits  (Volume:41 ,  Issue: 1 )