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This letter presents a novel adaptive power rectifier operating at four bands to harvest the electromagnetic energy in the low and wide-range power density conditions. The power range of the rectifier is extended by two operation modes controlled adaptively by a FET switch according to the input power level. A cross-shaped match stub connected by a stepped impedance microstrip line is designed to...
This paper presents a differentially-driven rectifier for enhanced RF power harvesting. Based on a traditional one-fed rectifier, a differentially-driven rectifier is designed, whose RF-to-DC power conversion efficiency (PCE) is roughly the same as that of the traditional one. The performance of the differentially-driven rectifier is verified by both simulation and measurement results. The measured...
This article presents an inductive power link for a cortical implant. The link includes a Class-E power amplifier, an inductive link, a matching network, and a rectifier. The coils of the inductive link are designed and optimized for a distance of 10mm (scalp thickness). The power amplifier is designed in order to allow closed loop power control by controlling the supply voltage. A new packaging topology...
The small scale of Smartdust sensor networks poses unique challenges in the design and implementation of RF power scavenging systems. To meet these challenges, several design improvements to an RF power scavenging circuit integrated directly onto CMOS are presented. These improve RF to DC conversion efficiency through a reduction in the body effect and threshold voltage of diode connected MOSFETs...
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