Results 261 to 270 of about 21,355 (312)
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A Handy Dandy Doherty PA: A Linear Doherty Power Amplifier for Mobile Handset Application
IEEE Microwave Magazine, 2017As wireless communications progress from second to fourth-generation (4G) systems, the information content drastically increases, requiring high-data-rate transmissions. For efficient use of precious spectrum resources, the modulated signals have wider bandwidths (BWs) and higher peak-toaverage power ratios (PAPRs) than previous generations of systems.
Cho, Yunsung +4 more
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IEEE Journal of Solid-State Circuits, 2012
A low-cost, fully integrated CMOS PA is attractive. The main challenge is to improve its power efficiency. Although many linearization and efficiency improvement techniques have been proposed, most of these techniques are based on feed-forward, which may not be effective under varying PVT and load conditions [1–3].
Shouhei Kousai +4 more
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A low-cost, fully integrated CMOS PA is attractive. The main challenge is to improve its power efficiency. Although many linearization and efficiency improvement techniques have been proposed, most of these techniques are based on feed-forward, which may not be effective under varying PVT and load conditions [1–3].
Shouhei Kousai +4 more
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Power Amplifier (PA) Transistors Fatigue Life Prediction under Thermo-Mechanical Cyclic Loading
7th. Int. Conf. on Thermal, Mechanical and Multiphysics Simulation and Experiments in Micro-Electronics and Micro-Systems, 2006In this paper, a simulation procedure was established for the fatigue life prediction of transistor assembly system under thermo-mechanical cyclic loading condition. By combining non-linear finite element (FE) methodology and test data, the failure mechanisms of transistor assembly system in response to thermal cyclic loading condition were ...
null Jianjun Wang +2 more
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IEEE Transactions on Microwave Theory and Techniques, 2021
This article presents a generalized theory and new design methodology for reverse-load-modulated dual-branch (RMDB) power amplifiers (PAs), which uses a current-biased transistor in the main branch to realize optimal load modulation without using the impedance transformers at the output of the PAs.
Yulong Zhao +9 more
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This article presents a generalized theory and new design methodology for reverse-load-modulated dual-branch (RMDB) power amplifiers (PAs), which uses a current-biased transistor in the main branch to realize optimal load modulation without using the impedance transformers at the output of the PAs.
Yulong Zhao +9 more
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2022
International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 13, 12, 13A12G: 1 ...
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International Transaction Journal of Engineering, Management, & Applied Sciences & Technologies, 13, 12, 13A12G: 1 ...
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Amping Up the PA for 5G: Efficient GaN Power Amplifiers with Dynamic Supplies
IEEE Microwave Magazine, 2017Signals designed for high-capacity communications result in high peak-to-average ratio (PAR) waveforms that the transmitter power amplifier (PA) must amplify with low distortion. With emerging fifth-generation (5G) wireless systems, carrier frequencies and signal bandwidths are expected to increase significantly from the current S- and C-band ...
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International Symposium on Electromagnetic Compatibility - EMC EUROPE, 2012
Investigation on conductive electromagnetic pulse (EMP) effects on performance degradation and breakdown of GaAs MESFET-based power amplifiers (PA) are performed in this paper. One special measurement system is built, which consists of an adjustable EMP source, one controller, couplers, limiters, attenuators, one four-channel oscilloscope, and DUT. The
Liang Zhou +3 more
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Investigation on conductive electromagnetic pulse (EMP) effects on performance degradation and breakdown of GaAs MESFET-based power amplifiers (PA) are performed in this paper. One special measurement system is built, which consists of an adjustable EMP source, one controller, couplers, limiters, attenuators, one four-channel oscilloscope, and DUT. The
Liang Zhou +3 more
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2013 21st Telecommunications Forum Telfor (TELFOR), 2013
Developments within modern nonlinear measurement systems offer an increasing degree of flexibility to the microwave power amplifier (PA) designer. The PA designer has historically been a driving factor in setting the development directions of new measurement systems, fueling the paradigm, that PA innovations largely push new measurement requirements ...
Jan H. Mikkelsen +5 more
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Developments within modern nonlinear measurement systems offer an increasing degree of flexibility to the microwave power amplifier (PA) designer. The PA designer has historically been a driving factor in setting the development directions of new measurement systems, fueling the paradigm, that PA innovations largely push new measurement requirements ...
Jan H. Mikkelsen +5 more
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Power Amplifier (PA) System Stability Analysis
2016Generally, large signal or Power Amplifier (PA) are used in the output stages of audio amplifier systems to derive a loudspeaker load. Power amplifier must be able to supply the high peak currents required to drive the low impedance speaker. One method used to distinguish the electrical characteristics of different types of amplifiers is by “class ...
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IEEE Microwave Magazine, 2017
Applications for space technology, test equipment, electronic warfare systems, and digital radio have made wide-band power amplifiers (WBPAs) the subject of research since 1948 [1], [2]. More recently, the advent of gallium nitride (GaN) technology with its special features, such as wide bandgap, high output power capability, and high electron velocity,
Ali Ghavidel +3 more
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Applications for space technology, test equipment, electronic warfare systems, and digital radio have made wide-band power amplifiers (WBPAs) the subject of research since 1948 [1], [2]. More recently, the advent of gallium nitride (GaN) technology with its special features, such as wide bandgap, high output power capability, and high electron velocity,
Ali Ghavidel +3 more
openaire +1 more source