The Auxiliary Envelope Tracking Rf Power Amplifier System

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The Auxiliary Envelope Tracking RF Power Amplifier System

Author : Zubaida Yusoff
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (835 download)

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Book Synopsis The Auxiliary Envelope Tracking RF Power Amplifier System by : Zubaida Yusoff

Download or read book The Auxiliary Envelope Tracking RF Power Amplifier System written by Zubaida Yusoff and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The advancement of the mobile communication industry increases the need for RF power amplifier (RFPA) to be more efficient and linear. The communication network that is shifting towards smaller micro-cell or nano-cell network has also motivated the design of the RF power amplifier to be simple, compact and cost efficient. In this research work, a novel technique for efficiency and linearity improvement of the RFPA is presented. A simplistic approach in the technique called 'Auxiliary Envelope Tracking' (AET) system has promoted the design for small and straightforward AET tracking generator, a key component in the system. The use of low cost components in the AET tracking generator has made the technique commercially attractive. The AET technique proposes a separation in generating DC and AC components of the AET signal that biases the drain of the RFPA. The separation eases the generation of the signals resulting in low power consumption that leads to efficiency improvement. The investigation of the gain characteristic of gallium nitride (GaN) RFPA has shown an important RFPA attribute where the gain varied substantially as the drain voltage increases. By using the AET technique, the gain characteristic is harnessed to get linearity improvement. In order to validate the technique, AET measurement systems for two-carrier and WCDMA signals were developed and experimented. A special Class AB RFPA is designed and implemented to use dedicatedly for this investigation. In two-carrier signal measurement, a tracking generator is developed that consists of an envelope amplifier (EA) and a diplexer. The RFPA and the tracking generator are then combined to be an integrated AET block. In order to accommodate the high peak-toaverage ratio (PAR) and high bandwidth WCDMA signal, a broadband RF transformer was designed as part of the AET tracking generator to replace the diplexer. The two-carrier and WCDMA signals measurement results have proven that the AET technique is a valid technique for efficiency and linearity improvement. The improvements were achieved with simple, compact and cost-effective implementation.

Envelope Tracking Power Amplifiers for Wireless Communications

Author : Zhancang Wang
Publisher : Artech House
ISBN 13 : 1608077845
Total Pages : 363 pages
Book Rating : 4.6/5 (8 download)

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Book Synopsis Envelope Tracking Power Amplifiers for Wireless Communications by : Zhancang Wang

Download or read book Envelope Tracking Power Amplifiers for Wireless Communications written by Zhancang Wang and published by Artech House. This book was released on 2014-06-01 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Envelope tracking technology is seen as the most promising efficiency enhancement technology for RF power amplifiers for 4G and beyond wireless communications. More and more organizations are investing and researching on this topic with huge potential in academic and commercial areas. This is the first book on the market to offer complete introduction, theory, and design considerations on envelope tracking for wireless communications. This resource presents you with a full introduction to the subject and covers underlying theory and practical design considerations.

Advanced Techniques in RF Power Amplifier Design

Author : Steve C. Cripps
Publisher : Artech House
ISBN 13 : 9781580535649
Total Pages : 342 pages
Book Rating : 4.5/5 (356 download)

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Book Synopsis Advanced Techniques in RF Power Amplifier Design by : Steve C. Cripps

Download or read book Advanced Techniques in RF Power Amplifier Design written by Steve C. Cripps and published by Artech House. This book was released on 2002 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This much-anticipated volume builds on the author's best selling and classic work, RF Power Amplifiers for Wireless Communications (Artech House, 1999), offering experienced engineers a more in-depth understanding of the theory and design of RF power amplifiers. An invaluable reference tool for RF, digital and system level designers, the book includes discussions on the most critical topics for professionals in the field, including envelope power management schemes and linearization.

Dynamic Power Supply Transmitters

Author : Earl McCune
Publisher : Cambridge University Press
ISBN 13 : 1107059178
Total Pages : 495 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis Dynamic Power Supply Transmitters by : Earl McCune

Download or read book Dynamic Power Supply Transmitters written by Earl McCune and published by Cambridge University Press. This book was released on 2015-05-21 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Power is dissipated (lost) when this current flows through any resistance, which includes the amplifier's transistor. This dissipated power is the product of the current in the load times the voltage difference between the supply voltage to the amplifier and the output signal voltage. When the voltage supplied to the amplifier is a constant value, and by far the most common design practice, the situation in Fig. 1-2a results. Power dissipation in the amplifier is maximum when the output signal voltage is 1/2 of the supply voltage. When the output signal voltage is higher, even though the current value is larger the voltage drop is less and the power dissipation is lower. Similarly, when the output signal voltage is small, even though the voltage drop is now large the current in the load is smaller and again the power dissipation is lower"--

High Efficiency Wideband Envelope Tracking Power Amplifier for Next-generation Wireless Communications

Author : Myoungbo Kwak
Publisher :
ISBN 13 : 9781124856230
Total Pages : 109 pages
Book Rating : 4.8/5 (562 download)

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Book Synopsis High Efficiency Wideband Envelope Tracking Power Amplifier for Next-generation Wireless Communications by : Myoungbo Kwak

Download or read book High Efficiency Wideband Envelope Tracking Power Amplifier for Next-generation Wireless Communications written by Myoungbo Kwak and published by . This book was released on 2011 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest generation of smart devices deployed in cellular networks has created explosive growth in network data traffic, and the increasing demand for broadband services with higher data rates, require higher peak to average power ratio (PAPR) with wider bandwidth. One of the challenges in the conventional power amplifiers (PAs) with fixed supply voltage, is the degraded efficiency and generated heats at a large back-off to meet tight linearity requirements. This dissertation presents high efficiency wideband envelope tracking power amplifiers for 2.1 GHz micro base-stations and 2.5 GHz wireless mobile applications. By superimposing the envelope signal at the drain such that the RF amplifier operates consistently closer to saturation, the overall efficiency is improved and the generated heat is reduced dramatically. In the first part of the dissertation, a high performance BiCMOS DMOS monolithic envelope amplifier for micro-base station power amplifiers is presented. Due to the low breakdown voltage of the CMOS transistors, the high voltage envelope amplifier has been implemented with discrete components with high voltage process. Compared to these discrete solutions, an integrated circuits implementation for the envelope amplifier brings many benefits. The design of monolithic envelope amplifiers for high voltage (VDD = 15 V) envelope tracking applications, and the design techniques to solve the reliability issues with thin gate oxide is described. The overall envelope tracking system employing a GaN-HEMT RF transistor, and fully integrated high voltage envelope amplifier with a 0.35[mu]m BiCMOS DMOS process, is demonstrated. In the second part, a high-efficiency wideband envelope tracking power amplifier for mobile LTE applications will be presented. The CMOS envelope amplifier with hybrid linear and switcher is designed in a 150 nm CMOS process. The envelope amplifier employs direct sensing of the linear stage current to reduce the propagation delay in the switcher. The strategy is demonstrated to improve the efficiency of the complete envelope tracking power amplifier system. The resulting performance of envelope tracking system employing a GaAs HBT-based RF PA with a 5 MHz LTE signal input demonstrated state-of-the-art efficiency while meet the linearity requirement.

Linear CMOS RF Power Amplifiers for Wireless Applications

Author : Paulo Augusto Dal Fabbro
Publisher : Springer Science & Business Media
ISBN 13 : 9048193613
Total Pages : 171 pages
Book Rating : 4.0/5 (481 download)

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Book Synopsis Linear CMOS RF Power Amplifiers for Wireless Applications by : Paulo Augusto Dal Fabbro

Download or read book Linear CMOS RF Power Amplifiers for Wireless Applications written by Paulo Augusto Dal Fabbro and published by Springer Science & Business Media. This book was released on 2010-06-22 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in electronics have pushed mankind to create devices, ranging from - credible gadgets to medical equipment to spacecraft instruments. More than that, modern society is getting used to—if not dependent on—the comfort, solutions, and astonishing amount of information brought by these devices. One ?eld that has continuously bene?tted from those advances is the radio frequency integrated c- cuit (RFIC) design, which in its turn has promoted countless bene?ts to the mankind as a payback. Wireless communications is one prominent example of what the - vances in electronics have enabled and their consequences to our daily life. How could anyone back in the eighties think of the possibilities opened by the wireless local area networks (WLANs) that can be found today in a host of places, such as public libraries, coffee shops, trains, to name just a few? How can a youngster, who lives this true WLAN experience nowadays, imagine a world without it? This book dealswith the design oflinearCMOS RF PowerAmpli?ers(PAs). The RF PA is a very important part of the RF transceiver, the device that enables wireless communications. Two important aspects that are key to keep the advances in RF PA design at an accelerate pace are treated: ef?ciency enhancement and frequen- tunable capability. For this purpose, the design of two different integrated circuits realizedina0. 11μmtechnologyispresented,eachoneaddressingadifferentaspect. With respect to ef?ciency enhancement, the design of a dynamic supply RF power ampli?er is treated, making up the material of Chaps. 2 to 4.

High-Efficiency Load Modulation Power Amplifiers for Wireless Communications

Author : Zhancang Wang
Publisher : Artech House
ISBN 13 : 1630814679
Total Pages : 389 pages
Book Rating : 4.6/5 (38 download)

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Book Synopsis High-Efficiency Load Modulation Power Amplifiers for Wireless Communications by : Zhancang Wang

Download or read book High-Efficiency Load Modulation Power Amplifiers for Wireless Communications written by Zhancang Wang and published by Artech House. This book was released on 2017-06-30 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This cutting-edge resource presents a complete and systematic overview of the practical design considerations of radio frequency (RF) high efficiency load modulation power amplifiers (PA) for modern wireless communications for 4G and beyond. It provides comprehensive insight into all aspects of load modulation PA design and optimization not only covering design approaches specifically for passive and active load modulation operation but also hybrid with dynamic supply modulation and digital signal processing algorithms required for performance enhancement. Passive load impedance tuner design, dynamic load modulation PA, active load modulation PA and Doherty PA design for efficiently enhancement are explained. Readers find practical guidance into load modulation PA design for bandwidth extension, including video bandwidth enhancement techniques, broadband dynamic load amplifiers, topology selection, design procedures, and network output. This book presents the evolution and integration of classical load modulation PA topologies in order to meet new challenges in the field.

High Efficiency Linear Envelope Tracking and Envelope Elimination and Restoration Power Amplifier for WLAN OFDM Applications

Author : Feipeng Wang
Publisher :
ISBN 13 :
Total Pages : 131 pages
Book Rating : 4.:/5 (819 download)

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Book Synopsis High Efficiency Linear Envelope Tracking and Envelope Elimination and Restoration Power Amplifier for WLAN OFDM Applications by : Feipeng Wang

Download or read book High Efficiency Linear Envelope Tracking and Envelope Elimination and Restoration Power Amplifier for WLAN OFDM Applications written by Feipeng Wang and published by . This book was released on 2006 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt: High efficiency radio frequency (RF) power amplifiers (PAs) are critical in portable battery-operated wireless communication systems because they can dominate the power consumption. Linear power amplifier is required for envelope modulated signal. Traditionally, linear power amplifiers are implemented by "backing-off" the Class-A or Class-AB PA. However for a high peak-to-average (PAR) signal, the average efficiency is much lower than the peak efficiency, which is well down as the inherent trade-off between linearity and efficiency. This dissertation focuses on Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) efficiency enhancement techniques to improve the PA average efficiency for high PAR signal. The EER and ET PA structures are investigated. Wideband ET and "hybrid" EER structures are proposed for WLAN 802.11g signal at 20MHz signal. Two major challenges of the wideband EER and ET PAs are investigated: 1) An adaptive time-alignment algorithm was proposed to calibrate the time-mismatch in wideband EER and ET systems; (2) A high efficiency wideband envelope amplifier is designed for wideband EER and wideband ET applications. A monolithic wideband high efficiency ET power amplifier is designed and implemented for WLAN 802.11g applications in IBM SiGe BiCMOS technology. Digital pre-distortion was implemented to reduce the EVM of the amplifier. The measured overall power-added efficiency of the amplifier is 28% at 20 dBm (100mW) output power.

Modulated Measurement and Engineering Systems for Microwave Power Transistors

Author : Muhammad Akmal Chaudhary
Publisher : BrownWalker Press
ISBN 13 : 1627347143
Total Pages : 342 pages
Book Rating : 4.6/5 (273 download)

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Book Synopsis Modulated Measurement and Engineering Systems for Microwave Power Transistors by : Muhammad Akmal Chaudhary

Download or read book Modulated Measurement and Engineering Systems for Microwave Power Transistors written by Muhammad Akmal Chaudhary and published by BrownWalker Press. This book was released on 2019-06-15 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The complexity requirements of future wireless communication systems now indeed demand a more general theoretically robust design methodology for nonlinear circuits, such as the power amplifiers. The present design methodology for nonlinear Radio Frequency components and circuits has become a key hindrance in the evaluation, development and testing of modern communication systems. The fundamental nature of this engineering challenge makes it highly unlikely to be addressed within the competitive Radio Frequency industry with short-term profitability, time to market and risk aversion considerations.

The book , therefore, includes developing advanced waveform measurement setups, multi-tone measurement techniques, characterization and modelling of nonlinear distortion in microwave power transistors and design of high-power and spectrum-efficient RF power amplifiers for future wireless communication systems. Further enlists the key impediments in Power Amplifier design through the application of waveform engineering to embrace simultaneously efficiency and linearity objectives of power amplifier design as well as investigate the most robust and appropriate behavioral model formulation that includes memory effects.

High Efficiency Broadband Envelope-Tracking Power Amplifiers

Author : Jonmei Johana Yan
Publisher :
ISBN 13 : 9781303195266
Total Pages : 168 pages
Book Rating : 4.1/5 (952 download)

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Book Synopsis High Efficiency Broadband Envelope-Tracking Power Amplifiers by : Jonmei Johana Yan

Download or read book High Efficiency Broadband Envelope-Tracking Power Amplifiers written by Jonmei Johana Yan and published by . This book was released on 2013 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to meet the increasing demand for higher data rates while maximizing spectral efficiency, modern wireless communication systems transmit complex non-constant envelope modulation signals with high peak-to-average ratio (PAPR). As a result, conventional power amplifiers must be operated in back-off, leading to a significant efficiency reduction. Various power amplifier architectures (i.e. Doherty, outphasing, and envelope tracking) have been demonstrated to achieve high efficiency for these high PAPR signals. Unlike the other architectures, the envelope tracking power amplifier (ETPA) makes an excellent candidate for multi-band multi-frequency use, while maintaining high efficiency for high PAPR and under average power back-off, as it is fundamentally immune to changes in the frequency of the carrier; it depends only on the envelope of the RF signal. This dissertation focuses on the design of envelope tracking power amplifiers for enabling broadband wireless communication systems. First, a test-bench for evaluating broadband ETPAs is described. A calibration routine, acting as a pre-equalizer, is used to achieve a flat linear response over the entire instantaneous bandwidth of the system, resulting in less than 1% EVM for a 40 MHz LTE signal. Performances of envelope tracking power amplifiers on this test-bench at various frequencies from UHF to millimeter-wave are evaluated, and record efficiencies are demonstrated. Next, this dissertation describes how in under practical usage, the power transmitted fluctuates as a function of the load demands over time. The long-term efficiency of the ETPA is evaluated using Monte-Carlo simulations based on a projected time-varying power profile. Compared to a Doherty PA with the same peak efficiency, the ETPA can provide more than 1.4x reduction in overall energy consumed. The ETPA thus provides significant opportunities for system energy savings under realistic operation. Thirdly, to accommodate the wide range of carrier frequencies required for numerous emerging wireless systems, a multi-octave RFPA based on a compact GaN stacked IC with RC feedback is designed, fabricated, and evaluated. Multi-octave ET operation was demonstrated from 500 to 1750 MHz with >25% efficiency. Compared to its constant drain voltage counterpart, >2x improvement in RFPA efficiency is observed in ET. Lastly, while the ETPA provides advantages such as broad carrier bandwidths and high efficiency under back-off operation, one of the main challenges in ETPA design lies in accommodating wide modulation bandwidths. Adaptive de-troughing, a digital signal processing approach for extending the modulation bandwidth capability of an existing dynamic power supply, is described and evaluated. Measurements demonstrated the ability to extend ET operation to 20 MHz LTE signals. In addition, ~5-6% modulator efficiency enhancement was measured when comparing "standard" to "adaptive" de-troughing supply waveforms.

High Efficiency RF and Microwave Solid State Power Amplifiers

Author : Paolo Colantonio
Publisher : John Wiley & Sons
ISBN 13 : 9780470746554
Total Pages : 514 pages
Book Rating : 4.7/5 (465 download)

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Book Synopsis High Efficiency RF and Microwave Solid State Power Amplifiers by : Paolo Colantonio

Download or read book High Efficiency RF and Microwave Solid State Power Amplifiers written by Paolo Colantonio and published by John Wiley & Sons. This book was released on 2009-07-08 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Do you want to know how to design high efficiency RF and microwave solid state power amplifiers? Read this book to learn the main concepts that are fundamental for optimum amplifier design. Practical design techniques are set out, stating the pros and cons for each method presented in this text. In addition to novel theoretical discussion and workable guidelines, you will find helpful running examples and case studies that demonstrate the key issues involved in power amplifier (PA) design flow. Highlights include: Clarification of topics which are often misunderstood and misused, such as bias classes and PA nomenclatures. The consideration of both hybrid and monolithic microwave integrated circuits (MMICs). Discussions of switch-mode and current-mode PA design approaches and an explanation of the differences. Coverage of the linearity issue in PA design at circuit level, with advice on low distortion power stages. Analysis of the hot topic of Doherty amplifier design, plus a description of advanced techniques based on multi-way and multi-stage architecture solutions. High Efficiency RF and Microwave Solid State Power Amplifiers is: an ideal tutorial for MSc and postgraduate students taking courses in microwave electronics and solid state circuit/device design; a useful reference text for practising electronic engineers and researchers in the field of PA design and microwave and RF engineering. With its unique unified vision of solid state amplifiers, you won’t find a more comprehensive publication on the topic.

Envelope Amplifier Design for Wireless Base-station Power Amplifiers

Author : Chin Hsia
Publisher :
ISBN 13 : 9781124324258
Total Pages : 128 pages
Book Rating : 4.3/5 (242 download)

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Book Synopsis Envelope Amplifier Design for Wireless Base-station Power Amplifiers by : Chin Hsia

Download or read book Envelope Amplifier Design for Wireless Base-station Power Amplifiers written by Chin Hsia and published by . This book was released on 2010 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to deliver high data rates, modern wireless communication systems transmit complex modulated signals with high peak-to-average ratio, which demands wide bandwidth and stringent linearity performance for power amplifiers. To satisfy spectral mask regulations and achieve adequate error vector magnitude, power amplifiers typically operate at 6 to 10 dB back-off from the maximum output power, leading to low efficiency. To overcome the low efficiency problem, the envelope tracking power amplifier architecture has been proposed for this type of application due to its feature of high efficiency over a wide power range. The overall efficiency of an envelope tracking system relies not only on performance of the RF power amplifier but also on that of an envelope amplifier that provides a dynamically varying power supply voltage. This dissertation focuses on envelope amplifier design for efficiency enhancement of envelope tracking power amplifiers. First, the envelope tracking power amplifier architecture is analyzed, and the efficiency of a RF transistor in the envelope tracking technique is described. Then envelope amplifier behavior is investigated and a general purpose simulator is developed for analyzing and designing an envelope amplifier. Power loss and efficiency of the envelope amplifier is analyzed and compared with experimental results. The design of envelope amplifiers for high voltage (> 30 V) envelope tracking applications is described. A high voltage envelope amplifier is designed, implemented and verified. The overall envelope tracking system employing a GaN-HEMT RF transistor is demonstrated. Finally, a new architecture is developed for the efficiency enhancement of envelope amplifiers, using a digitally assisted controller design. Digital control is utilized to mitigate delay in the control loop inside the envelope amplifier, leading to lower overall power dissipation. A novel envelope amplifier architecture with dual-switcher stages based on the digitally-assisted control strategy is proposed, designed and implemented. The strategy is demonstrated to improve the efficiency of envelope amplifier as well as the system overall efficiency. The resulting performance of envelope tracking system employing a GaAs high voltage HBT with a single carrier W-CDMA input demonstrated state-of-the-art efficiency with good linearity performance.

Envelope Amplifier for Broadband Base-station Envelope Tracking Power Amplifier

Author : Qiuyao Zhu
Publisher :
ISBN 13 : 9781124727844
Total Pages : 125 pages
Book Rating : 4.7/5 (278 download)

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Book Synopsis Envelope Amplifier for Broadband Base-station Envelope Tracking Power Amplifier by : Qiuyao Zhu

Download or read book Envelope Amplifier for Broadband Base-station Envelope Tracking Power Amplifier written by Qiuyao Zhu and published by . This book was released on 2011 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Envelope tracking (ET), which is a dynamic supply control technology to realize high efficiency power amplifiers, is a promising approach for base-station transmitters of the future. The envelope amplifier (EA) in ET systems provides a non-constant modulated power supply to the RF transistor. It is challenging to design so that it is both broadband and high efficiency, while meeting the stringent linearity requirements for high peak-to-average ratio signals in modern wireless communication systems. This thesis focuses on EA design and implementation for efficiency enhancement of ET systems with broadband envelope input signals. First, the ET system architecture is analyzed, and the efficiencies of RF transistors and envelope amplifiers are described. Secondly, the principles of the EA operation are investigated, and each circuit stage is carefully designed for broadband signals. Then, an EA model, including the RF transistor load, is developed in PSpice, and many simulations are described in order to better analyze and design the broadband EA for high efficiency. After the design, a broadband EA is implemented on a PCB board. The testing with constant resistive loads is carried out to verify the function and measure the efficiencies of 5 MHz WCDMA and 20 MHz LTE-A downlink envelope signals. Finally, tests on the whole ET system are performed, and the overall drain and power added efficiencies are tabulated. For this broadband envelope amplifier, the efficiency for a 5 MHz WCDMA input signal is above 75%, and for 20 MHz LTE-A, it works robustly with an efficiency of 62%.

Modeling and Design Techniques for RF Power Amplifiers

Author : Arvind Raghavan
Publisher : John Wiley & Sons
ISBN 13 : 9780470228302
Total Pages : 224 pages
Book Rating : 4.2/5 (283 download)

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Book Synopsis Modeling and Design Techniques for RF Power Amplifiers by : Arvind Raghavan

Download or read book Modeling and Design Techniques for RF Power Amplifiers written by Arvind Raghavan and published by John Wiley & Sons. This book was released on 2008-02-04 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Achieve higher levels of performance, integration, compactness, and cost-effectiveness in the design and modeling of radio-frequency (RF) power amplifiers RF power amplifiers are important components of any wireless transmitter, but are often the limiting factors in achieving better performance and lower cost in a wireless communication system—presenting the RF IC design community with many challenges. The next-generation technological advances presented in this book are the result of cutting-edge research in the area of large-signal device modeling and RF power amplifier design at the Georgia Institute of Technology, and have the potential to significantly address issues of performance and cost-effectiveness in this area. Richly complemented with hundreds of figures and equations, Modeling and Design Techniques for RF Power Amplifiers introduces and explores the most important topics related to RF power amplifier design under one concise cover. With a focus on efficiency enhancement techniques and the latest advances in the field, coverage includes: Device modeling for CAD Empirical modeling of bipolar devices Scalable modeling of RF MOSFETs Power amplifier IC design Power amplifier design in silicon Efficiency enhancement of RF power amplifiers The description of state-of-the-art techniques makes this book a valuable and handy reference for practicing engineers and researchers, while the breadth of coverage makes it an ideal text for graduate- and advanced undergraduate-level courses in the area of RF power amplifier design and modeling.

Design and Implementation of an Envelope Tracking Power Amplifier Using Switched Amplifiers and Slow Envelopes

Author : Pedro Pablo Vizarreta Paz
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (84 download)

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Book Synopsis Design and Implementation of an Envelope Tracking Power Amplifier Using Switched Amplifiers and Slow Envelopes by : Pedro Pablo Vizarreta Paz

Download or read book Design and Implementation of an Envelope Tracking Power Amplifier Using Switched Amplifiers and Slow Envelopes written by Pedro Pablo Vizarreta Paz and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Highly Efficient And Linear RF Power Amplifier For Mobile Terminal Applications

Author : Alireza Kheirkhahi
Publisher :
ISBN 13 : 9781303377471
Total Pages : 93 pages
Book Rating : 4.3/5 (774 download)

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Book Synopsis A Highly Efficient And Linear RF Power Amplifier For Mobile Terminal Applications by : Alireza Kheirkhahi

Download or read book A Highly Efficient And Linear RF Power Amplifier For Mobile Terminal Applications written by Alireza Kheirkhahi and published by . This book was released on 2013 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The radio frequency (RF) power amplifier (PA) is the last block in a transmitter chain. It amplifies the signal to the target power and drives the antenna. The power amplifier consumes the largest portion of the transmitter current consumption budget, and any power saving in this block will significantly improve the overall system efficiency. This is especially critical in battery-operated portable wireless communication systems such as cellular phones, PDA's and laptops. There is a trade-off between efficiency and linearity in power amplifiers. Non-switching power amplifiers efficiency increases as the output power increases, but so does the amplifier distortion. This is more problematic in modern wireless communication systems, where spectrally efficient and high data rate modulations are used and the linearity requirement is hard to meet. The two common approaches of backing-off the output power and adding a linearization scheme have their own challenges. The first one results in efficiency loss and the second one adds to the system complexity and has design challenges for wideband applications. The design of highly efficient and linear RF power amplifiers has been the subject of several studies. Different techniques have been proposed to overcome the challenge. Dynamic control of the power amplifier quiescent current, dynamic control of the load impedance, output harmonic control and dynamic supply voltage control (envelope tracking) are the popular proposed techniques. Despite the fact that the envelope tracking technique has gained momentum as an attractive efficiency enhancement method for handset applications, its implementation still faces challenges. This technique needs a high efficiency envelope amplifier to achieve good overall efficiency. The design of a small, efficient and wideband envelope amplifier is very challenging. Usually these amplifiers require external components and if they are in the switching mode they can add disturbance to the rest of the system. This research focuses on a technique that overcomes this main challenge of the ET amplifier design and is organized as follows : Chapter 1 is the introduction and discusses the motivation of this research and some of the prior art. Chapter 2 explains the proposed technique to enhance the RF power amplifiers efficiency in high peak-to-average power ratio applications. This technique is based on controlling the baseband drain impedance by adding an envelope termination to the PA supply, and applying the baseband envelope signal to the input. As a result, the amplifier operates closer to its saturated region for all envelope amplitudes, and its efficiency is improved. A digital predistortion scheme is implemented to compensate for the linearity degradation of the proposed technique. A 1.95GHz HFET power amplifier exhibits an improvement in peak PAE from 40% to 56% for a two-tone input, from 33% to 42% for an uplink WCDMA with one dedicated physical data channel and from 27% to 32% for an uplink WCDMA with six dedicated physical data channels using the proposed technique. Chapter 3 shows some improvements to the proposed technique including adding envelope equalization. The envelope equalization also improves the amplifier linearity since it reduces the distortion from clipping the output signal due to non-ideal dynamic supply. The linearity of the implemented amplifier is studied in a large-signal fashion. This technique improves the maximum efficiency from 28% to 40% for an uplink WCDMA signal with six dedicated physical data channels and the maximum linear efficiency from 21% to 28%. Also, a scheme to vary the DC power supply with the average power to maintain high efficiency down to a low average power region is proposed. Chapter 4 studies envelope feedback systems stability. The stability criteria are derived based on the Lyapunov stability theorem for time-varying systems and the tool of linear matrix inequality (LMI). The effects of system parameters on the stability are investigated. The system is simulated in Simulink and implemented, and stability boundaries predicted by LMI are in good agreement with the simulation and measurement results. Chapter 5 concludes the dissertation and suggests some future work.

Design of Linear RF Outphasing Power Amplifiers

Author : Xuejun Zhang
Publisher : Artech House
ISBN 13 : 1580533744
Total Pages : 212 pages
Book Rating : 4.5/5 (85 download)

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Book Synopsis Design of Linear RF Outphasing Power Amplifiers by : Xuejun Zhang

Download or read book Design of Linear RF Outphasing Power Amplifiers written by Xuejun Zhang and published by Artech House. This book was released on 2003 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the outphasing approach to amplifier linearization that uses power-combining techniques to create a linear output waveform from two nonlinear input sources, and presents recent advances in resolving the limitations caused by the strict matching requirements between the two amplifiers and the microwave power wasted in the power-combing network. The authors discuss the linearity performance of outphasing amplifier systems, correction schemes based on training vectors, and power recycling in outphasing amplifiers. Zhang is an engineer with Qualcomm, while Larson and Asbeck are affiliated with the University of California, San Diego. Annotation (c)2003 Book News, Inc., Portland, OR (booknews.com).