This work presents a new RF power amplifier characterization technique based on Gaussian pulse, which is shown to approximate the envelope of multicarrier signal with 0.5% error around peaks. The standard deviation pulses inversely proportional I/Q bandwidth. test accurately capture nonlinear memory effects that result in gain dispersion after peak reached. As an example, it amplitude and phase...

250 Abstract—Trellis coding combined with expanded signal sets has been considered in this paper to improve error performance over uncoded modulation. New communications services have created the demand for highly linear high power amplifiers (HPA's). Traveling Wave Tubes Amplifiers (TWTA) continue to offer the best microwave HPA performance in terms of power efficiency, size and cost, but lag...

Stable low-noise high-power lasers are indispensable in advancing the strain sensitivity of interferometric gravitational wave detectors. Advanced LIGO and Advanced Virgo are currently under commissioning and require about 200 W of single-frequency laser power, while the future detector design may require up to the order of 500 W. In this Letter, we present the design and, to the best of our kn...

new power amplifier (PA) architecture is proposed as a more power efficient way to amplify modulated signals at radio-frequencies (RF) compared to conventional polar power amplifiers. Polar PA's, using the Envelope Elimination and Restoration (EER) linearizing technique for high efficiency switch mode amplifiers provide amplification for modulated signals at RF with high efficiency and linearit...

←− LINC transmitters (LInear amplification with Nonlinear Components) are suitable for the power amplification of variable-envelope signals, since they allow the use of lowcost, highly-efficient strongly-nonlinear power amplifiers. However, the combination of the outputs of the LINC’s two amplifiers has is the weak part of it: the combiner losses offset the amplification efficiency gains inhere...

Power amplifiers (PAs) are vital components in many communication systems. To be transmitted wirelessly, a signal must be amplified with high fidelity so as to account for attenuation through the channel or propagation medium. The linearity of a PA response constitutes an important factor that ensures signal integrity and reliable performance of the communication system. Unfortunately, PAs are ...

Target audience: This work is relevant to those interested in parallel transmit amplifiers. Purpose: Previous work has demonstrated the use of high efficiency switch mode power amplifier (SMPA) topologies for miniature on-coil amplifiers aimed at use in parallel transmit coil arrays. Though such amplifiers demonstrate very high efficiency and power density in isolation, there has not yet been a...

1. Problem Statement and Objectives 1.1. Problem Statement 1.2. Objectives 1.2.1. Research Questions 1.3. Background 1.3.1. Trends in Geostationary Communication Satellite Design 1.3.1.1. What are power amplifiers? Why are they important? 1.3.1.2. Traveling Wave Tube Amplifiers 1.3.1.3. Solid State Power Amplifiers 1.3.1.4. SSPA vs. TWTA Space Technologies 1.3.2. Space Weather Phenomena 1.3.2.1...