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

TitleEfficient Far-Field Radio Frequency Energy Harvesting for Passively Powered Sensor Networks
Publication TypeJournal Article
Year of Publication2008
AuthorsLe, T., K. Mayaram, and T. S. Fiez
JournalIEEE Journal of Solid-State Circuits
Volume43
Issue5
Pagination1287 - 1302
Date Published05/2008
ISSN0018-9200
Keywordsfar field, floating gate, high efficiency, interface circuit, micro power, passively powered, power conversion, rectifier, RF powered, sensor network
Abstract

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.

DOI10.1109/JSSC.2008.920318
Short TitleIEEE J. Solid-State Circuits