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A Comparison of GaN Class E Inverter and Synchronous Rectifier Designs for 13.56 MHz, 27.12 MHz and 40.68 MHz ISM Bands
Aaron Clements;Vipul Vishnoi;Soroush Dehghani;Thomas Johnson
2018 IEEE Wireless Power Transfer Conference (WPTC)
Year: 2018 | Conference Paper |
Cited by: Papers (7)
A comparative study of class-E inverter and synchronous rectifier designs is made for wireless power applications operating in the 13.56 MHz, 27.12 MHz and 40.68 MHz frequency bands. All the designs use the same GaN switch, gate driver, and PCB layout to provide a consistent reference for comparing the performance of the different designs. The synchronous rectifier circuits are designed as circuit...Show More
An Inverter-Based Bidirectional and Reconfigurable RF Energy Harvesting Circuit with Rectifier and Oscillator Modes
2018 IEEE/MTT-S International Microwave Symposium - IMS
Year: 2018 | Conference Paper |
Cited by: Papers (1)
A bidirectional circuit that can be reconfigured as a receiver for rectifying RF power for energy harvesting and as a power oscillator for transmission is described. Except for one switch, power flow is completely reversible. The circuit block is compact and suitable for integration in time-division multiplexed wireless sensors. The circuit design is based on the concepts of time-reversal duality ...Show More
A 5.8-GHz Bidirectional and Reconfigurable RF Energy Harvesting Circuit With Rectifier and Oscillator Modes
IEEE Solid-State Circuits Letters
Cited by: Papers (14)
A bidirectional circuit that can be reconfigured as a receiver for rectifying radio-frequency (RF) power for energy harvesting, and as a power oscillator for transmission, is proposed. The circuit is compact and suitable for integration in time-division multiplexed wireless sensors. A design concept based on time-reversal duality theory is employed to reuse the same circuit elements for both the o...Show More
Analysis, design, and characterization of wireless power transfer systems using conical coils
Parinaz Hadadtehrani;Soroosh Dehghani;Reza Molavi;Vasudevan Janarthanan;Thomas Johnson;Shahriar Mirabbasi
2016 14th IEEE International New Circuits and Systems Conference (NEWCAS)
Year: 2016 | Conference Paper |
Cited by: Papers (2)
In this paper, we present the analysis, design, and characterization of wireless power transfer (WPT) systems that use planar and conical coils. It is shown that the conical coils have superior performance in terms of self-resonant frequency and quality factor as compared to their planar coil counterparts. A power transfer efficiency of up to 53.9% is achieved for a 4-coil WPT system employing con...Show More
Transconductance mode CMOS synchronous rectifier circuits
2016 IEEE MTT-S International Microwave Symposium (IMS)
Year: 2016 | Conference Paper |
Cited by: Papers (6)
Two CMOS synchronous rectifiers have been implemented using 0.13 μm technology. Together, the two designs can rectify a 2.4 GHz RF input signal over a 40 dB dynamic range from -30 dBm to +10 dBm. The CMOS rectifiers are designed to operate either as class-B or class-C synchronous rectifiers. In one design, a zero-threshold voltage device is shunted by a positive threshold device to provide rectifi...Show More
A 2.4-GHz CMOS Class-E Synchronous Rectifier
A class-E synchronous rectifier has been designed and implemented using 0.13-μm CMOS technology. A design methodology based on the theory of time-reversal duality has been used where a class-E amplifier circuit is transformed into a class-E rectifier circuit. The methodology is distinctly different from other CMOS RF rectifier designs which use voltage multiplier techniques. Power losses in the re...Show More
Adjustable Load With Tracking Loop to Improve RF Rectifier Efficiency Under Variable RF Input Power Conditions
Terminating an RF rectifier with an optimum load resistance is important to maximize the efficiency of converting RF power to dc power. The optimum load resistance can also vary significantly as a function of RF input power. Therefore, an adjustable load circuit that tracks changes in RF power is required to maximize efficiency. As a way of implementing an adjustable load circuit that can provide ...Show More
2.4 GHz CMOS class D synchronous rectifier
2015 IEEE MTT-S International Microwave Symposium
Year: 2015 | Conference Paper |
Cited by: Papers (10)
A CMOS synchronous class D rectifier is implemented in 130 nm technology. The rectifier is designed to operate at 2.4 GHz and requires no external supplies for biasing. The measured RF to DC power efficiency is 30% for an input power of +10 dBm and the power efficiency is greater than 25% over a 12 dB dynamic range from 4-16 dBm. The area of the rectifier is 780 μm by 670 μm including input matchi...Show More
Tracking load to optimize power efficiency in RF to DC rectifier circuits
2015 IEEE Wireless Power Transfer Conference (WPTC)
Year: 2015 | Conference Paper |
Cited by: Papers (7)
A tracking load circuit for RF rectifiers is described. The tracking load is designed to maximize RF to DC conversion efficiency as the RF input power to the rectifier changes. The circuit consists of two DC to DC converters with two control loops. The duty cycle of the first stage converter is adjusted by an analog control loop to have an input impedance that is optimum for maximizing the power e...Show More
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