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Based upon a unique junction pseudomorphic high electron-mobility transistor (J-pHEMT) device, a novel method of providing high-efficiency power amplifier (PA) power control for variable envelope modulation schemes is demonstrated for enhanced data rates for global system for mobile communications evolution and wide-band code division multiple access. This(More)
The system specifications of RF energy harvesting are outlined, indicating the general guideline of low power circuit and system design as well as the frequency set to be used in the system. Four frequency bands representing five wireless standards were chosen namely, GSM, DTV, Wi-Fi, Bluetooth and road tolling system. A harvesting system has been designed(More)
A frequency reconfigurable LNA is designed using novel tunable RF-MEMS varactors. The designed MEMS varactor can be fabricated and integrated in 0.35μm CMOS technology from Taiwan Semiconductor Manufacturing Company (TSMC). The frequency of operation of the LNA varies from 2.7 GHz to 3.1 GHz by tuning the capacitance of the MEMS varactor. The MEMS(More)
This paper introduces a preliminary Tunable Digital Low pass Channel Filter designed and implemented according to the 3GPP Release 10 Receiver Characteristics. The filter is built using Altera's DSP Builder Design Environment and Matlab Simulink to allow for FPGA implementation at a later stage. The functional simulation shows that the filter can satisfy(More)
— In this paper an efficient RF-DC Rectifier is presented. The rectifier features high efficiency levels in low input power regions, which showed better performance compared to similar work in the literature. This is achieved through careful design of the rectifier and optimization of several aspects that affects the rectifier operation. To provide high(More)
This paper introduces another methodology of charging lithium-ion batteries for portable devices such as laptops and tablets. The presented low-cost charger circuit which is developed to be easily designed follows the constant-current and constant-voltage scheme, CC-CV. Also, this charger circuit will continuously and automatically charge and discharge the(More)