Paper Info
Title
Design of a 2.45-GHz RF Energy Harvester for SWIPT IoT smart sensors
Abstract
Simultaneous wireless power and information transfer (SWIPT) is a flexible and cheap way to supply IoT smart sensors avoiding battery replacement. In this paper, we study the design of a 2.45-GHz RF energy harvester (RFEH) system based on a discrete-component matching network, a custom 65nm CMOS cross-coupled rectifier coupled with an off-the-shelf storage-charging power management unit (PMU) performing rectifier output voltage regulation with maximum power point tracking (MPPT). For 2.45-GHz operation, we propose a parasitic-aware sizing of π matching network. This introduces a maximum bound on the real impedance at the rectifier input to ensure good impedance matching in practice. MPPT is used to help reaching this target real impedance at given input RF power, as the rectifier input impedance is a function of both its input and output voltages. Measurement results show a sensitivity as low as -17.1 dBm with a peak power harvesting efficiency (PHE) of 48.3% at -3 dBm 2.45-GHz input RF power. Comparison between simulation and measurement results demonstrate that these results are limited by the parasitic capacitance and that PHE around 45% can be obtained down to -10 dBm with PCB/package improvement for lower parasitic capacitance.
Year
DOI
Venue
2018
10.1109/ASSCC.2018.8579281
2018 IEEE Asian Solid-State Circuits Conference (A-SSCC)
Keywords
Field
DocType
RF energy harvester,2.45-GHz,maximum power point tracking,power harvesting efficiency,impedance matching
Rectifier,Parasitic capacitance,Computer science,Impedance matching,Maximum power point tracking,Electronic engineering,Voltage regulation,RF power amplifier,Input impedance,Power Management Unit
Conference
ISBN
Citations 
PageRank 
978-1-5386-6414-8
0
0.34
References 
Authors
0
3
Name
Order
Citations
PageRank
Pengcheng Xu1122.29
Denis Flandre231670.47
David Bol316227.67