Results 251 to 260 of about 5,748,011 (307)
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A novel time misalignment estimation algorithm for envelope tracking (ET) power amplifiers (PA)
2014 IEEE 25th Annual International Symposium on Personal, Indoor, and Mobile Radio Communication (PIMRC), 2014In this paper, we present a novel algorithm for estimating the delay (dT) between the RF input of an RF power amplifier (PA) and the modulated supply voltage that is generated by an envelope tracking (ET) power modulator, also known as a power tracker.
Craig E. Rupp +4 more
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Hybrid Supply Modulator for High Power RF PA with Non-Inverting Amplifier
2019 IEEE Conference on Antenna Measurements & Applications (CAMA), 2019In this paper, we design a Hybrid Supply Modulator (HSM) based on Non-Inverting Amplifier for High Power Amplifier (HPA) operating in C-band. Compared with the conventional HSM, the Switching stage and the R-sense stage are eliminated to prevent the power consumption, and the Non-Inverting Amplifier is applied to the linear stage.
Kun Hee Ha +5 more
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Highly Efficient DSP-Guided Power Amplifier (PA) for Wireless OFDM Applications
AIAA Infotech@Aerospace 2010, 2010In this work, a high efficiency double-enveloping DSP-guided hybrid power amplifier design is presented for wide band applications. The high peak-to-average power ratio (PAPR) of OFDM signals is a major bottleneck in the implementation of wide-band high efficiency transmitters.
Mudassar Nisar +4 more
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IEEE Microwave Magazine, 2020
High efficiency is especially important for portable equipment and other applications where low power consumption is required. Consequently, power efficiency has been thoroughly discussed and investigated over the past few decades [7]. From this research, a number of different approaches and technologies have evolved for power amplifiers (PAs) and used
Markus Heinrichs, Rainer Kronberger
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High efficiency is especially important for portable equipment and other applications where low power consumption is required. Consequently, power efficiency has been thoroughly discussed and investigated over the past few decades [7]. From this research, a number of different approaches and technologies have evolved for power amplifiers (PAs) and used
Markus Heinrichs, Rainer Kronberger
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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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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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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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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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