DocumentCode :
3531081
Title :
An Integrated CMOS RF Energy Harvester with Differential Microstrip Antenna and On-Chip Charger
Author :
Arrawatia, Mahima ; Diddi, Varish ; Kochar, Harsha ; Baghini, Maryam Shojaei ; Kumar, Girish
Author_Institution :
Dept. of Electr. Eng., IIT Bombay, Mumbai, India
fYear :
2012
fDate :
7-11 Jan. 2012
Firstpage :
209
Lastpage :
214
Abstract :
This paper presents an energy harvesting system which extracts energy from radio frequency radiation for battery charging applications. It comprises of a new differential center tapped Micro strip antenna, off-chip matching circuit, on-chip novel CMOS rectifier and control circuitry in 180nm CMOS technology. For on-chip modules, thick oxide devices have been used so as to meet the charging requirements of the target batteries. The designed battery charging module charges either of 250 Ah and 10 Ah batteries according to the selected battery and available input power. The 250 Ah battery is charged at input power of 2dBm and 10 Ah battery is charged at input power of -6.5dBm. The fabricated antenna has a gain of 8.3dB and a VSWR less than 2 in the bandwidth from 844 to 970MHz. An efficient Periodic Steady State(PSS)-based power matching technique is also presented which improves the system efficiency. For 0dBm input power at 950 MHz to the antenna the proposed technique leads to 55.2% efficiency of RF to DC converter system. In addition to the integrated design a discrete rectifier using high frequency Schottky diodes and differential micro strip antenna at the input are fabricated. The discrete system uses the proposed matching technique and exhibits efficiency of 40% for-11dBm received power by the antenna.
Keywords :
CMOS analogue integrated circuits; Schottky diodes; UHF antennas; UHF integrated circuits; battery chargers; energy harvesting; low-power electronics; microstrip antennas; rectifiers; RF to DC converter system; battery charging application module; control circuitry; differential center tapped microstrip antenna fabrication; discrete rectifier integrated design; energy harvesting system; frequency 844 MHz to 970 MHz; gain 8.3 dB; high-frequency Schottky diodes; integrated CMOS RF energy harvester; off-chip matching circuit; on-chip CMOS rectifier; on-chip charger; periodic steady state-based power matching technique; radio frequency radiation; thick oxide device; Batteries; CMOS integrated circuits; Energy harvesting; Impedance; Microstrip antennas; Transistors; Antenna; Battery charging; CMOS; Impedance Matching; RF Energy Harvesting; Rectifier;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
VLSI Design (VLSID), 2012 25th International Conference on
Conference_Location :
Hyderabad
ISSN :
1063-9667
Print_ISBN :
978-1-4673-0438-2
Type :
conf
DOI :
10.1109/VLSID.2012.72
Filename :
6167720
Link To Document :
بازگشت