Results 11 to 20 of about 9,812 (215)
Microwave class-E power amplifiers [PDF]
2017 IEEE MTT-S International Microwave Symposium (IMS), 2017 This paper reviews circuit architectures and demonstrated class-E power amplifiers in the UHF and microwave frequency range. Scaling class-E soft-switching operation to high frequencies presents a number of challenges, particularly in the control of parasitic reactances of the device and the circuit.
Zoya Popovic, Jose A. Garcia
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Analytical Design Equations for Class-E Power Amplifiers [PDF]
IEEE Transactions on Circuits and Systems I: Regular Papers, 2007 This paper presents the analytical solution in time domain for the ideal single-ended Class-E Power Amplifier (PA). Based on the analytical solution a coherent non-iterative procedure for choosing the circuit parameters is presented for Class- E PA’s with arbitrary duty-cycle and finite dc-feed inductance (e.g.
Mustafa Acar +2 more
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Load Mismatch Sensitivity of Class-E Power Amplifiers [PDF]
IEEE Transactions on Microwave Theory and Techniques, 2019 Class-E RF power amplifiers (PAs) are very power efficient under nominal operating conditions. Due to incorporating two tuned tanks, the dependence on the load impedance is, however, relatively large, resulting in, e.g., load-dependent output power, power efficiency, peak voltages, and peak (and average) currents which can lead to reliability issues ...
Ali Ghahremani +2 more
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An 1 GHz class E LDMOS power amplifier [PDF]
33rd European Microwave Conference Proceedings (IEEE Cat. No.03EX723C), 2003 A class E power amplifier working at 1 GHz and with an LDMOS transistor as switching element has been developed.The circuit is implemented with lumped and distributed elements.An output power of 6.2 W at 69 %drain efficiency with a gain of 11 dB was obtained at 1 GHz.Both simulations and measurements of the amplifier are presented within this paper ...
Adahl, Andreas, Zirath, Herbert
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Output Power Control in Class-E Power Amplifiers [PDF]
IEEE Microwave and Wireless Components Letters, 2010 A technique is presented to facilitate power control of cascode class-E power amplifiers (PAs). It is shown that by controlling the signal applied to the gate of the cascode transistor, the transmit power is changed. The main advantage of the proposed technique is a high 36 dB output power control range (PCR) compared to 20 dB for the traditional ...
Sira, Daniel +2 more
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A novel inverse class E power amplifier topology
2013 21st Signal Processing and Communications Applications Conference (SIU), 2013 In this work, a 10 Watt inverse class-E power amplifier has been proposed, simulated, realized and measured for the 2.7-2.9 GHz wireless applications. In the proposed power amplifier topology distributed elements were used instead of lumped elements and their widths and lengths were optimized with AWR Microwave Office.
Kizilbey, Neslihan, Kizilbey, Oguzhan
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High Power Wideband Class-E Power Amplifier [PDF]
IEEE Microwave and Wireless Components Letters, 2010 This letter shows a high-power, high-efficiency, wideband Class-E RF power amplifier designed upon the load admittance synthesis concept and built using an uncomplicated low-loss load network with a low loss wideband admittance transformer as the main component.
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Variable-Voltage Class-E Power Amplifiers [PDF]
2007 IEEE/MTT-S International Microwave Symposium, 2007 Abstract—The Class-E power amplifier is widely used due to its high efficiency, resulting from switching at zero voltage and zero slope of the switch voltage. In this paper, we extend general analytical solutions for the Class-E power amplifier to the ideal single-ended Variable-Voltage Class-E (Class-EV V ) power amplifier that switches at zero slope ...
Acar, M., Annema, Anne J., Nauta, Bram
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Gut microbiome and aging—A dynamic interplay of microbes, metabolites, and the immune system
FEBS Letters, EarlyView.Age‐dependent shifts in microbial communities engender shifts in microbial metabolite profiles. These in turn drive shifts in barrier surface permeability of the gut and brain and induce immune activation. When paired with preexisting age‐related chronic inflammation this increases the risk of neuroinflammation and neurodegenerative diseases.
Aaron Mehl, Eran Blacher
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From mice to humans—divergent strategies for intestinal homeostasis and regeneration
FEBS Letters, EarlyView.Recent advances such as organoid genome editing, xenotransplantation, imaging, and whole‐genome sequencing have enabled direct studies of human intestinal stem cells (ISCs). These studies reveal species‐specific features, including slower ISC proliferation, distinct injury responses, slower somatic mutation accumulation in humans, and an inverse ...
Keiko Ishikawa +2 more
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