In this paper, power amplifier operating with center frequency of 947.5 MHz, which can be used for the transmitter in beamforming systems, is proposed. The power amplifier implemented provides high power added efficiency (PAE) of 71.967% and low noise figure (NF) as low as 1.525. The linearity of the power amplifier is improved by using square law and cubic law analog predistortion techniques. ...

This paper proposes the use of double-frequency (DF) buck converter architecture consisting of a merged structure of high and low frequency buck cells as a candidate topology for envelope elimination and restoration (EER) applications and integrated power supply of RF power amplifiers (RFPA) to obtain favorable tradeoffs in terms of efficiency, switching ripple, bandwidth, and tracking capabili...

The motivation behind the study of low drop-out (LDO) regulators is driven by the increasing demand for higher performance power supply circuits. This paper discusses thoroughly the important issues relevant to the emergence and design of these circuits. An increasing number of low voltage applications require the use of LDOs, i.e., cellular phones, pagers, laptops, etc. Switching regulators, t...

In this paper, the reason for the relatively high distortion level of conventional class-D audio amplifiers is discussed. It is pointed out that the classical approach is insufficient for high performance applications. Therefore the importance of the matching between modulation and demodulation is demonstrated by simulation. 1. THE CLASS-D-AUDIO AMPLIFIER The concept of class-D amplifiers was i...

High-resolution gradient power amplifiers are required to generate high-fidelity fields in magnetic resonance imaging (MRI) systems. Various aspects of have been the subject research past years, however, systematic analysis and design methods for its resolution improvement not sufficiently addressed. This article addresses this gap with comprehensive improvement. First, a method characterizatio...

Many erbium doped fiber amplifier (EDFA) based multi-wavelength optical networks employ techniques such as burst-switching or packet switching where the time interval between traffic blocks can be long enough to induce EDFA optical power transients. The optical power transients are created by abrupt changes in the average input power to the EDFAs and can adversely affect the performance of the ...

This paper describes the design and measured performance of a 1-8GHz power amplifier MMIC fabricated with a 0.15um Gallium Nitride (GaN) process technology. The process features a 100um thick Silicon Carbide (SiC) substrate and compact transistor layouts with individual source grounding vias (ISV). The design utilizes a non-uniform distributed power amplifier (NDPA) topology with a novel trifil...

A class E power amplifier including coupling coils is proposed for application in a wireless power transfer system using magnetic coupling. The proposed amplifier is directly connected to the coils with no discrete components for harmonic filtering and dc feeding, which could cause efficiency degradation of the amplifier. The system with the differential amplifier shows 6.95 W of transmitted po...

Switching power converters are used in industrial application to convert and deliver their required energy to the motor or lo ad because of advances in solid state power devices and microprocessors. Pulse Width Modulation variable speed drives are increasingly applied in many new industrial applications that require superior performance. The advantages of PWM based switc hing power converter ov...