Rf and microwave power amplifier design, second edition. We explain the operation principles, including both linearity and efficiency improvements, and the basic circuit configuration of the amplifier. Power transfer characteristics, intrinsic pa metrics, linear and nonlinear amplifiers, pa architectures, singlestage linear pa, loadline theory, transistors size, input and output matching, highefficiency pas, class a, ab, b and c amplifiers, realworld design example, system specifications and power control. The conduction angle of the classc biased peaking device has important role on the efficiency, gain, power and linearity characteristics of the overall doherty amplifier. The doherty amplifier is a modified class b radio frequency amplifier invented by william h. The doherty power amplifier, which proved to be an effective solution for 3g and 4g mobile communication systems, is still far from being overcome by other techniques and is currently attracting great research interest, which results in plenty of novel advanced solutions available in the literature. Dohertys books in order of when they were originally published. Motivation the talk time of a cell phone, defined as the time it takes to discharge the battery while on a call, is an important metric to the success of a phone. With class ab amplifiers, the magnitude of the type 2 distortion is symmetric about the center frequency, whereas with doherty amplifiers, it is not. Reinventing bill doherty and his highefficiency amplifier. The linear doherty power amplifier is realized by the harmonic cancellation between the carrier and peaking amplifiers. Click download or read online button to get the doherty amplifier and beyond book now. The book introduces the very basic operational principles of the doherty amplifier and its.
Currently the doherty power amplifier dpa is replacing the traditional class b amplifier in basestation and broadcast applications, as such becoming the preferred choice of industry due to its simplicity and high efficiency performance. The doherty power amplifier high efficiency rf and. This chapter is devoted to these linear doherty amplifier design techniques for handset applications. This paper presents a linear doherty power amplifier dpa topology suitable for lowpowered small cell and multiantenna fifth generation transceivers. Read this book to learn the main concepts that are fundamental for optimum amplifier design. This manuscript describes the design, development, and implementation of a linear high efficiency power amplifier.
The symmetrical doherty power amplifier utilizes triquints 2nd generation gallium nitride gan on silicon carbide sic high electron mobility transistor hemt devices t1g6001032sm for a specified design frequency of 3. The doherty amplifier offers improved efficiency compared to balanced amplifiers, when output power is backed off from saturation. Pond abstracta novel procedure is introduced for designing doherty ampli. Christopher burns rf power platform development manager power broadband business unit rf micro devices. Improving the efficiency of rf power amplifiers with. Doherty amplifiers are typically used in communications radios, not radars. The gain degradation of the adpa in the load modulation region where the classc biased peaking device starts to conduct results in poorer poweradded efficiency. Presentation advanced power amplifier design using. But the amplifier is less popular for handset application. It uses two identical amplifiers in the circuit, but does not offer quite the performance of the second type.
Nov 06, 20 this video, created by alvaro munoz with sat, illustrates the concept of the doherty power amplifier. Review of recent solutions and trends article pdf available in ieee transactions on microwave theory and techniques 632. Advanced design of a double doherty power amplifier with a flat efficiency range yongsub lee, munwoo lee, sangho kam, and yoonha jeong department of electronic and electrical engineering, pohang university of science and technology. This muchanticipated volume builds on the authors popular work, rf power amplifiers for wireless communications artech house, 1999, offering you a more indepth understanding of the theory and design of rf power amplifiers. Advanced design of a double doherty power amplifier with a. In spite of its success, so far practical dpa implementations can provide only a very limited rf. Paolo colantonio was born in rome on march 1969 and he received electronic engineering and ph. High efficiency rf and microwave solid state power amplifiers. Two architectures are presented, the balanced and doherty microwave amplifiers. By paolo colantonio, franco giannini, rocco giofre and luca piazzon.
Advanced power amplifier design using doherty configurations authored by. The basic doherty amplifier theory requires that the signals between the two halves are matched in phase so that the combination occurs in a way that both signals add together to provide the required output. Chapter from the book advanced microwave circuits and systems. One of his extraordinary series is the hugh corbett series consisting of a total of 17 novels published between the years 1986 and 2010. Pdf high efficiency power amplifiers for 5g wireless. The design technique using gaas hbt is described in detail, and cmos doherty power amplifier is also discussed. Design and simulation of a doherty power amplifier for the. The doherty amplifier and beyond download ebook pdf. Microwave doherty power amplifier for high efficiency and linearity. It was the result of research activities devoted to find a solution to increase. When the twoway dpa is used as the main peaking amplifier, the driving peaking cell with classc bias turns the dpa off before the saturation of the main carrier amplifier.
The implemented doherty amplifiers show very good performance, demonstrating that doherty amplifier is a promising candidate for power amplifiers with wide. A new high efficiency amplifier for modulated waves, w. This site is like a library, use search box in the widget to get ebook that you want. An invaluable reference tool for rf, digital and system level designers, the book enables you to efficiently design linear rf power amplifiers, and includes detailed. Also, the input distribution circuit of a doherty amplifier implicates some additional losses figure 1. Introduction the doherty power amplifier dpa architecture was introduced for the first time in 1936 by w. D degrees in microelectronics and telecommunications from the university of roma tor vergata in 1994 and 2000 respectively, working on design criteria for high efficiency power amplifiers.
In 1999 he became a research assistant at the electronic engineering department of the university of roma. Paul doherty became a published author in 1985 with his novel the death of a king on edward ii. Improving the efficiency of rf power amplifiers with digital. Its implementation in solid state applications has been largely limited to specialized systems such as satcom. Doherty power amplifier is a good solution for amplification of a high papr signal as clearly seen from the popularity in the basestation amplification. Practical design techniques are set out, stating the pros and cons for each method presented in this text. The doherty amplifier is an ideal candidate for maximizing the power amplifier efficiency while simultaneously maintaining amplifier linearity faithful signal reproduction for signals with high.
Jul 24, 2009 do you want to know how to design high efficiency rf and microwave solid state power amplifiers. There is a number of different types of doherty power amplifier that can be designed. In the doherty region, the auxiliary amplifier also contributes to the output power, with an efficiency that increases with power figure 6, blue curve. Bandwidth and efficiency enhancement in radio frequency power. Biased in class c, the peak path of a doherty amplifier has inher ently lower gain. The basic principle is that when the output signal level is low, only the main amplifier is active. Chapter 10 highefficiency doherty power amplifiers introduction this chapter describes the historical aspect of the doherty approach to the power amplifier design and modern trends in doherty amplifier design techniques selection from switchmode rf and microwave power amplifiers, 2nd. In order to solve the conflict between the efficiency and the linearity of a power amplifier in the base station, the doherty structure is adopted to desig design and simulation of a doherty power amplifier for the base station ieee conference publication. Index terms doherty amplifier, gan, class f, harmonic tuning, ldmos. Department of electronic engineering, university of roma, tor vergata, italy. The fabricated power amplifier pa exhibits, at 24 ghz in continuouswave conditions, an output power of 30. Doherty power amplifiers by bumman kim overdrive rakuten. Cmosbased magnetic particle detectors for medical diagnosis applications, ieee microwave magazine, vol.
Due to this attractive characteristic and the relative simple implementation scheme, the dpa. Advanced design features of doherty power amplifiers. In addition to novel theoretical discussion and workabl. Peak amp gain gain pout pout basic operation characteristic a1 a2 w carrier amplifier. Gemini pro gpa6000 5000w 2 channel power dj amplifier 2u rack mount amp stereo. Chapter 10 highefficiency doherty power amplifiers introduction this chapter describes the historical aspect of the doherty approach to the power amplifier design and modern trends in doherty amplifier design techniques selection from switchmode rf and microwave power amplifiers, 2nd edition book. First described in 1936, the doherty amplifier is now the predominant choice in wireless transmitters for wcdma and lte systems. King henry viii, a fearsome figure of power and stature, lies upon his deathbed diminished by sickness and haunted by ghosts from his past. Typical dpa efficiency behavior versus input power. Jul 24, 2009 summary this chapter contains sections titled. Doherty august 21, 1907 february 15, 2000 was an american electrical engineer noted for his invention of the doherty amplifier doherty was born in cambridge, massachusetts, received his b.
This is the more straightforward design of amplifier. Abstract this paper reports a new double doherty power amplifier ddpa with a flat efficiency range, which consists of twostage amplifiers. The doherty amplifier and beyond download ebook pdf, epub. Paul is always happy to hear from readers and will always try to personally respond. The book describes both existing and new schematic configurations, theoretical approaches, circuit simulation results, and implementation techniques. Highpower audio amplifier construction manual ebook written by g. If you wish to contact paul for talks, events, interviews or would like to write to him please email him at. Doherty, at the bell telephone laboratories of whippany, new jersey doherty, 1936. The book introduces the very basic operational principles of the doherty amplifier and its nonideal behaviors. Master historian paul doherty weaves his magic in an epic tale of murderous schemes and a bloodsmattered political order. Class ab saturates at the high power input w peak amplifier. Free power amplifiers books download ebooks online textbooks.
Doherty power amplifier pa has been widely used in base station and. Doherty power amplifier fully integrated in bulk cmos, ieee j. Introduction dohertys idea the classical doherty configuration the ab. Read doherty power amplifiers online by bumman kim books. The website of historian and critically acclaimed author paul doherty gives information about his books, news and future events. Highpower audio amplifier construction manual by g. Whereas conventional classb amplifiers can clip on high inputsignal levels, the doherty power amplifier can accommodate signals with high peaktoaverage power ratios by using two amplifier circuits within the one overall amplifier to accommodate.
Sengupta, rf and mmwave power generation in silicon, 1st edition, academic press, elsevier, dec. The workhorse of nowadays wireless rf infrastructure the doherty power amplifier. Regardless, dohertys new linear amplifier concept aroused a lot of interest in the broadcast engineering community, as. Fully updated to address cuttingedge technologies, the new edition of this practical guide provides comprehensive, stateoftheart coverage of rf and microwave power amplifier design. The power split at the input of the doherty amplifier is relatively straightforward. Doherty amplifier article about doherty amplifier by the. Doherty power amplifier an overview sciencedirect topics. Download for offline reading, highlight, bookmark or take notes while you read highpower audio amplifier construction manual. The standard 2 way doherty amplifier works by splitting the amplifier into two equally sized amplifiers of half the size of a single ended class ab amp with the same peak power capability.
Advanced design features of doherty power amplifiers eduard bertran, pere l. This book focuses on broadband power amplifier design, where nonlinear. The gain degradation of the adpa in the load modulation region where the classc biased peaking device starts to conduct results in poorer power added efficiency. The doherty power amplifier 1936 to the present day. Paul doherty has written five novel series in his writing career, many of which have been extremely successful. The doherty power amplifier dpa was invented in the far 1936 by w. Presentation advanced power amplifier design using doherty.
Aug 20, 2016 in this episode shahriar demonstrates the architecture and design considerations for high power microwave amplifiers. Or it could have had something to do with the almost concurrent development at bell labs of the massive 320a 250 kw triode, a device that seemed ideally suited for a really highpower implementation of his amplifier circuit. Wang, a transformerbased reconfigurable digital polar doherty power amplifier fully integrated in bulk cmos, rf and mmwave power generation in silicon, 1st edition. The gain of a doherty amplifier is usually even lower than that of a singlepath pa. Index termsdoherty amplifier, gan, class f, harmonic tuning, ldmos. The heart of the doherty amplifier is the doherty combiner, shown below. At the maximum input power level, the efficiencies of both amplifiers are maximum, and they contribute equally to the output power, which is therefore 6 db higher than that at the break point. In this article, we show that the doherty amplifier is capable of delivering the stringent requirements of the base station power amplifiers.
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