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Efficient Far-Field Radio Frequency Energy Harvesting for Passively Powered Sensor Networks

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3 Author(s)
Le, T. ; Oregon State Univ., Corvallis ; Mayaram, K. ; Fiez, T.

An RF-DC power conversion system is designed to efficiently convert far-field RF energy to DC voltages at very low received power and voltages. Passive rectifier circuits are designed in a 0.25 mum CMOS technology using floating gate transistors as rectifying diodes. The 36-stage rectifier can rectify input voltages as low as 50 mV with a voltage gain of 6.4 and operates with received power as low as 5.5 muW(22.6 dBm). Optimized for far field, the circuit operates at a distance of 44 m from a 4 W EIRP source. The high voltage range achieved at low load current make it ideal for use in passively powered sensor networks.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:43 ,  Issue: 5 )