Abstract
This article presents a review of the CMOS rectifier for radio frequency energy harvesting application. The on-chip rectifier converts the ambient low-power radio frequency signal coming to antenna to useable DC voltage that recharges energy to wireless sensor network (WSN) nodes and radiofrequency identification (RFID) tags, therefore the rectifier is the most important part of the radio frequency energy harvesting system. The impedance matching network maximizes power transfer from antenna to rectifier. The design and comparison between the simulation results of one- and multi-stage differential drive cross connected rectifier (DDCCR) at the operating frequencies of 2.44GHz, and 28GHz show the output voltage of the multi-stage rectifier doubles at each added stage and power conversion efficiency (PCE) of rectifier at 2.44GHz was higher than 28GHz. The (DDCCR) rectifier is the most efficient rectifier topology to date and is used widely for passive WSN nodes and RFID tags.
Highlights
An on-chip rectifier is semiconductors bsed device of a size of a few square microns
Battery replacement and maintenance are difficult if not impossible in the wireless sensor network (WSN) nodes and the output power of the on-chip rectifier is less than the operating energy of the WSN node in the wireless power transfer domain
One of the approaches to increase the efficiency of Wireless Power Transfer (WPT) is to use an appropriate impedance matching network that develops the efficiency at the front end of the dedicated WPT receiver, as well as the ambient radio frequency energy harvester, and cascading rectifier's stages increases the output DC voltage which provides a sustainable source of adequate power to the nodes of the wireless sensor network
Summary
An on-chip rectifier is semiconductors bsed device of a size of a few square microns. It is a component built into the radio frequency energy harvester converts AC from RF signal coming to antenna to useful DC voltage. CMOS is a preferable technology for integrating the rectifier circuit on chip. The output power of rectifier should be equal or more than the energy consumption of sensor node for the sensor to be capable to operate perpetually. Wireless power transfer is a new technology and an independent scientific field consist mainly of transmitter and receiver subfields, and the receiver is such that the radio frequency energy harvesting system discussed in this article focuses on WSN networks.
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