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RF power amplifier

About: RF power amplifier is a research topic. Over the lifetime, 21191 publications have been published within this topic receiving 294253 citations.


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Book
30 Sep 2000
TL;DR: This is the first single comprehensive guide to examine and directly compare all major RF power amplifier linearization techniques in detail and save you valuable design time while helping to avoid costly design errors.
Abstract: From the Publisher: Based on the author's real-world design experience in this key emerging area, this is the first single comprehensive guide to examine and directly compare all major RF power amplifier linearization techniques in detail. Packed with practical tips, more than 250 illustrations, and over 600 verified equations, the book saves you valuable design time while helping you avoid costly design errors. It covers the modeling and measurement of amplifier non-linearity, and describes the main methods for overcoming non-linearity in a wide range of applications, including: > base stations using feedforward and predistortion > mobile communications systems and handsets using RF or digital predistortion, cartesian loop, LINC and envelope elimination and restoration (EE&R ) > satellite systems using any of these techniques

689 citations

Book
31 May 2002
TL;DR: RF power amplifier modes Doherty and Chireix - themes and variations topics in PA non-linearity envelope feedback predistortion feedforward microwave-power amplifier design.
Abstract: RF power amplifier modes Doherty and Chireix - themes and variations topics in PA non-linearity envelope feedback predistortion feedforward microwave-power amplifier design.

680 citations

Journal ArticleDOI
TL;DR: Theoretical and experimental results are presented that establish the value of parallel excitation with a transmit coil array in accelerating excitation and managing RF power deposition and suggest that by exploiting the localization characteristics of the coils, an orchestrated play of shorter RF pulses can achieve desired excitation profiles faster without adding strains to gradients.
Abstract: Theoretical and experimental results are presented that establish the value of parallel excitation with a transmit coil array in accelerating excitation and managing RF power deposition. While a 2D or 3D excitation pulse can be used to induce a multidimensional transverse magnetization pattern for a variety of applications (e.g., a 2D localized pattern for accelerating spatial encoding during signal acquisition), it often involves the use of prolonged RF and gradient pulses. Given a parallel system that is composed of multiple transmit coils with corresponding RF pulse synthesizers and amplifiers, the results suggest that by exploiting the localization characteristics of the coils, an orchestrated play of shorter RF pulses can achieve desired excitation profiles faster without adding strains to gradients. A closed-form design for accelerated multidimensional excitations is described for the small-tip-angle regime, and its suppression of interfering aliasing lobes from coarse excitation k-space sampling is interpreted based on an analogy to sensitivity encoding (SENSE). With or without acceleration, the results also suggest that by taking advantage of the extra degrees of freedom inherent in a parallel system, parallel excitation provides better management of RF power deposition while facilitating the faithful production of desired excitation profiles. Sample accelerated and specific absorption rate (SAR)-reduced excitation pulses were designed in this study, and evaluated in experiments.

640 citations

Patent
09 Sep 1994
TL;DR: In this article, a control system responds to impedance and temperature as sensed between and at the electrodes (13) during desiccation each of such electrodes being provided separately and independently through a suitable multiplexer with a specifically controlled RF power.
Abstract: In an ESV a control system responds to impedance and temperature as sensed between and at the electrodes (13) during desiccation each of such electrodes being provided separately and independently through a suitable multiplexer with a specifically controlled RF power. An instantaneous impedance monitor senses impedance variations and controls by means of specific derivative sensitive algorithm part of a feedback loop, the output power delivered through each electrode. A further temperature dependent feedback loop power control system is operative in a multiplexed mode in pair with the above impedance feedback system. Such second system uses an array of temperature sensors placed in the immediate proximity of the each tissue contacting electrode, and an appropriate derivative sensitive algorithm. Both systems are operated in a multiplex mode through a first multiplexer. A second multiplexer shifts the output power to the various electrodes independently and separately.

591 citations

Book
08 Feb 1990
TL;DR: This paper presents a meta-modelling architecture for two-Tone Intermodulation Products for RF/Microwave Computer-Aided Workstations foor MMIC Requirements and some examples of such products can be found in the literature on this topic.
Abstract: Foreword by David Leeson. Preface. 1. RF/Microwave Systems. 2. Lumped and Distributed Elements. 3. Active Devices. 4. Two-Port Networks. 5. Impedance Matching. 6. Microwave Filters. 7. Noise in Linear Two-Ports. 8. Small- and Large-Signal Amplifier Design. 9. Power Amplifier Design. 10. Oscillator Design. 11. Microwave Mixer Design. 12. RF Switches and Attenuators. 13. Microwave Computer-Aided Workstations foor MMIC Requirements. Appendix A: BIP: Gummel-Poon Bipolar Transistor Model. Appendix B: Level 3 MOSFET. Appendix C: Noise Parameters of GaAs MESFETs. Appendix D: Derivations for Unilateral Gain Section. Appendix E: Vector Representation of Two-Tone Intermodulation Products. Appendix F: Passive Microwave Elements. Index.

577 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202386
2022258
2021219
2020357
2019395
2018445