Title :
Efficient Far-Field Radio Frequency Energy Harvesting for Passively Powered Sensor Networks
Author :
Le, Triet ; Mayaram, Karti ; Fiez, Terri
Author_Institution :
Oregon State Univ., Corvallis
fDate :
5/1/2008 12:00:00 AM
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.
Keywords :
CMOS integrated circuits; passive networks; rectifiers; transistor circuits; wireless sensor networks; CMOS technology; RF-DC power conversion system; far-field radio frequency energy harvesting; floating gate transistors; passive rectifier circuits; passively powered sensor networks; Batteries; CMOS technology; Circuits; Low voltage; Monitoring; Power conversion; Radio frequency; Radiofrequency identification; Rectifiers; Sensor systems; Far field; RF powered; floating gate; high efficiency; interface circuit; micro power; passively powered; power conversion; rectifier; sensor network;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2008.920318
