Dissertations / Theses on the topic 'Amplificateurs de puissance (PA)'
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Tant, Gauthier. "Etude et intégration en SOI d’amplificateurs de puissance reconfigurables pour applications multi-modes multi-bandes." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT101/document.
Full textThis work focuses on the study and integration of a reconfigurable multi-mode multi-band power amplifier (MMPA) supporting 2G/3G/4G at several frequency bands in SOI CMOS 130nm technology. Current hybrid MMPA modules take advantage of multiple technologies, in particular GaAs for power devices. This adds to the cost and complexity of radiofrequency front-end modules. The original solution presented in this thesis is a significant step toward the integration of MMPA compared to the state of the art and initial results illustrates the relevance of the proposed architecture. A study on PA efficiency under 3G / 4G modulated signals is also presented by comparing load and supply modulation PA architectures.First, the context and state of the art are presented. A design methodology based on the study of different operating classes is then presented, which allows pre-sizing of power cells and optimal load impedance determination for high efficiency reconfigurable PA design.The proposed PA design methodology led to the implementation of PA demonstrators integrated in SOI CMOS 130nm technology. The first demonstrator is a two stage reconfigurable MMPA operating from 700MHz to 900MHz and supporting saturated and linear modes. The power stage comprises two SOI LDMOS power cells that are activated according to the desired mode. Tunable matching networks based on switched capacitor arrays allow optimization of the MMPA performance according to the mode and band. The measured prototype delivers up to 35dBm of output power in saturated mode with more than 58% efficiency. In linear mode, the measured output power exceeds 30dBm with efficiency higher than 47%. Compared to initial simulations, some differences were observed. In particular, underestimation of losses associated with MOM capacitors and sub-optimal interconnections are the root cause of the observed discrepancies.The second demonstrator is a passive load modulation PA architecture. It includes a SOI LDMOS power cell and a tunable matching network made of high power binary weighted switched capacitor arrays. The tunable matching network allows presenting an optimal load trajectory to the PA in order to maximize its back-off efficiency. Measured efficiency enhancement is higher than 55% compared to a fixed load configuration for 7dB to 11dB power back-offs
Boutayeb, Mohammed Saad. "Architecture et conception d’un amplificateur de puissance large-bande pour des applications 4G/5G." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT055.
Full textThe arrival of the 5G NR put more constraints on the transceivers architectures. They must integrate more components (filters, power amplifiers, etc.) in order to address more numerous and wider bands (in particular the “sub-6 GHz” bands) in addition to processing more complex signals. These new space and performance constraints that transceivers must meet have a direct impact on the technical specifications of power amplifiers (PAs). On the one hand it is necessary to have PAs which address wider bands in order to reduce the number of components in the emission chain; on the other hand, these PAs must meet the criteria of linearity of the new standards (LTE-A and 5G NR) while ensuring good operating energy efficiency. The work of this thesis concerns the investigation of advanced PA architectures combining bandwidth, linearity and energy efficiency.The context and the motivations of the thesis stated, the choice of SOI 130nm RF technology and the constraints to which the PA must respond are justified. A study of the state of the art of improved efficiency PAs architectures makes it possible to select Doherty architecture as an interesting solution. A theoretical study of the Doherty architecture is carried out in order to model its operation, to identify the impact of the dimensioning parameters and the parasitic capacitances of the transistor on the performances before exploring the bandwidth perspectives it presents. A first demonstrator circuit was implemented in RF SOI 130nm. It is a Doherty amplifier stage covering the 3.2-3.6 GHz band. For an LTE 10MHz 50RB signal at an output power of 27dBm, a maximum ACLR of -30.5 dBc and a minimum PAE of 36% was measured across the band. A second Doherty circuit integrating a driver stage has been implemented in the same technology. Measurements for an LTE 10MHz 12RB signal at 28 dBm of output power give a maximum ACLR of -35 dBc and a minimum PAE of 32% over the whole band 3.2-3.8 GHz which allows to cover the B42, B43 and B49 bands
Demirel, Nejdat. "Co-design d’un bloc PA-antenne en technologie silicium pour application radar 80GHz." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14167/document.
Full textThis work focuses on the design of a power amplifier (PA) at 79 GHz and the co-integration of the PA and the antenna on SiGe technology. The objective of this thesis is to develop a RF front-end block for radar applications at 79 GHz. This block is compound of a power amplifier, antenna and PA/Antenna inter-stage matching. The inter-stage between the PA and the antenna adds supplementary losses in the global performances, especially prohibitive in integrated technology for high frequencies. The co-design of the antenna and the PA allows to suppress the traditional inter-stage impedance matching between these two blocks. More specifically, it is suitable to design the antenna with the appropriate output impedance of the PA which gives optimal performances for maximum power and efficiency
Marin, Răzvan-Cristian. "Transmetteurs radiofréquences numériques fortement parallélisés avec amplificateur de puissance commuté et filtre de bande embarqués en technologie 28nm FD-SOI CMOS." Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10100/document.
Full textThe present PhD work covers the study, design and demonstration of all-digital transmitters targeting advanced communication standards for mobile applications in the frame of the Internet of Things (IoT). Key innovations are time-interleaved Delta-Sigma modulators (DSM) and a power and area-efficient switched-capacitor (SC) finite impulse response power amplifier (FIR-PA). The common FIR-PA block uses exclusively inverters and capacitors in a switched-capacitor configuration, thus being fully compatible with advanced CMOS technology nodes. The prototype is integrated in 28nm FD‐SOI CMOS technology with 10 metal layers and body biasing fine-tuning features. The proposed digital RF transmitter achieves 13.5 in‐band effective number of bits and is 900 MHz LTE‐compliant. The overall power consumption is 35 mW at 2.9 dBm peak output power and 1V supply. With respect to relevant state-of-the art, at similar output power levels, the FIR‐PA consumes 7 times less than a 10‐bit DSM‐based DAC and 25% less than a 12‐bit resistive DAC. The total active area is 0.047 mm2, at least 4 times lower than the smallest previously published work. Consequently, this work stands out for low power consumption thanks to the single-bit core solution combined with band filtering and low area achieved with a multi-layer FIR-PA cell structure. It demonstrates the transition from traditional analog to highly integrated digital-intensive transmitters targeting the future of mobile applications
Ben, mabrouk Mouna. "PA efficiency enhancement using digital linearization techniques in uplink cognitive radio systems." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0296/document.
Full textFor a battery driven terminal, the power amplifier (PA) efficiency must be optimized. Consequently,non-linearities may appear at the PA output in the transmission chain. To compensatethese distortions, one solution consists in using a digital post-distorter based on aVolterra model of both the PA and the channel and a Kalman filter (KF) based algorithm tojointly estimate the Volterra kernels and the transmitted symbols. Here, we suggest addressingthis issue when dealing with uplink cognitive radio (CR) system. In this case, additionalconstraints must be taken into account. Since the CR terminal may switch from one subbandto another, the PA non-linearities may vary over time. Therefore, we propose to designa digital post-distorter based on an interacting multiple model combining various KF basedestimators using different model parameter dynamics. This makes it possible to track thetime variations of the Volterra kernels while keeping accurate estimates when those parametersare static. Furthermore, the single carrier case is addressed and validated by simulationresults. In addition, the relevance of the proposed approach is confirmed by measurementscarried on a (300-3000) MHz broadband PA
Demirel, Nejdat. "Co-design d'un bloc PA-Antenne en technologie silicium pour application radar 80 GHz." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2010. http://tel.archives-ouvertes.fr/tel-00586071.
Full textCheng, Xinying. "Study and mitigation techniques of RF impairments for beyond 5G multi-carrier waveforms." Electronic Thesis or Diss., Sorbonne université, 2021. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2021SORUS181.pdf.
Full textFundamental research towards beyond 5G cellular networks is ongoing and the vision of 2020 and beyond includes a significant amount use cases considering a massive number of devices with a wide range of characteristics and demands. On the one hand, the good spectral efficiency gives more capacity for the transmission while on the other hand, building compact and low-cost flexible and high-quality radio equipment is a very challenging task. The context of this thesis is the study of massive MIMO techniques with the presence of radio frequency (RF) imperfections, in particular, the non-linear (NL) power amplifiers (PA). The large number of PAs equipped in the base station (BS) creates various constraints which lead to strong degradation of the transmission quality both in the band and out of band. On the other hand, 5G standardization introduced the concept of different numerologies together with the massive MIMO technique. The influence of the different numerologies used by the different users will also be studied in this thesis
Najjari, Hamza. "Power Amplifier Design Based on Electro-Thermal Considerations." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0422.
Full textThe aim of this work is to design a power amplifier based on electrothermal considerations. It describes the Dynamic Error Vector Magnitude challenge and long packet issue when designing a power amplifier with hetero-junction bipolar transistors. Based on the circuit electrothermal behavior, an optimization method of both the static and dynamic linearity is proposed. A complete RF front-end (PA + coupler + switch + LNA) is designed for the latest WLAN standard: the Wi-Fi 6. The dynamic temperature distribution in the circuit is analyzed. It’s impact on the performances is quantified. Finally, a programmable temperature dependent bias is designed to compensate for performance degradation. The measurements show a significant linearity improvement with this compensation, allowing the PA to maintain the DEVM lower than -47dB at 14.5 dBm output power, over a large ambient temperature range from -40°C to 85°C
Theveneau, Hadrien. "Amplificateurs de puissance à transistors GaN." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10204/document.
Full textThe goal of this thesis is to realize a pulsed power source with GaN transistors. After a study of the applications of high power microwaves, and a state of the art of the sources, we realized two prototypes of elementary amplifier modules (wide and narrow band). The wideband module produces 70 W CW from 1 to 2.5 GHz, and the narrowband module produces a power higher than 550 W from 1.1 to 1.3 GHz, with a 750 W peak at 1.1 GHz, in 500 µs pulses with 10 % duty cycle. One difficulty is that GaN transistors have low input and output impedances, from 1 to 5 Ω, difficult to adapt towards the 50 Ω standard on a wide bandwidth, and that several transistors need to be combined to reach high input powers, ensuring their mutual isolation to avoid failure propagation and oscillations. We developpes a power combiner using an impedance pre-adaptation with a deffective ground plane allowing to reach a 2.5 Ω low input impedance, and using a microwave absorber to avoid odd mode reflections, which allows the mutual isolation of the transistors
Denoual, Jean Michel. "Combinaison de puissance : conception et réalisation d'une structure hybride 3D-planaire en bande K." Brest, 2007. http://www.theses.fr/2007BRES2034.
Full textThe satellite payload evolution will have a great impact on power amplifier efficiency, redundancy and flexibility. Solid state power amplifiers (SSPA) should be used to replace traveling wave tubes (TWT) but power combining techniques are necessary as SSPA output power levels are lower than TWT. The radial power combining technique is well suited for spatial applications. It consists in placing amplifiers around a radial waveguide to feed amplifiers with equi-magnitude and equi-phase signals. Transitions between various propagation structures (coaxial, rectangular, radial, planar) were optimized and tested and a new radial 16-way power divider-combiner including planar structures for SSPA mounting (MMIC) was designed. An original mechanism to balance MMIC phase dispersion was successfully implemented in the divider-combiner structure
Willmann, Benoît. "Fonctionnement des amplificateurs hautes fréquences de puissance à triode munis d'un circuit de réaction." Nancy 1, 2001. http://www.theses.fr/2001NAN10269.
Full textThis work is devoted to a study of the operation of the high frequency amplifiers provided with a feedback circuit. It is shown that it is possible to take part of the amplifier output power, through use of a grounded-grid triode, and to reinject it in phase, with the signal applied to the cathode. This increases the stage gain by a factor five and makes it possible to reduce the power which must be provided by the preamplifier. The positive feedback is made through a coaxial line, the length of which is close to the wavelength. A combiner ensures the addition of the signals, at the amplifier input. The concept of output impedance of a linear amplifier has been extended to nonlinear amplifiers, of classes B and C It is based on the same relation ship which binds the variations in gain to the variations of impedance of the load that the amplifiers. The output impedance of an amplifier, with a grounded-grid triode and whose output circuit is resonant, varies little when the stage is corrected by a positive feedback
Macraigne, François. "Développement d'un système de mesure temporel d'enveloppe de dispositifs non linéaires microondes." Limoges, 2005. http://aurore.unilim.fr/theses/nxfile/default/7c3f9242-5ea5-4708-84f1-779d39e35b75/blobholder:0/2005LIMO0042.pdf.
Full textThis work deals with the hardware and software development of a time domain envelope characterisation system of RF power devices. This calibrated measurement bench has been developed in order to generate and measure complex envelopes associated with the RF modulated signals at the input and the output ports of power devices under test. This manuscript describes the architecture of the calibrated measurement setup, its calibration procedure and the signal processing used for the correction of measured raw data in order to get error corrected measurements at the device under test reference ports. A first application consists in the linearity characterisation of a power amplifier for different modulated signals and different load impedance. A second application consists in the use of a bias modulation technique in order to linearize the behaviour a power transistor
Cesari, Bohigas Albert. "Implémentation de techniques de linéarisation et d'amélioration du rendement pour les amplificateurs de puissance RF." Toulouse, INSA, 2008. http://eprint.insa-toulouse.fr/archive/00000239/.
Full textThe antagonism between information capacity and energetic efficiency in the context of wireless communications, more precisely : the trade-off between transmitter linearity and its efficiency ; is the main driver of this thesis. A FPGA5-based architecture for digital predistortion (DPD) linearizers for RF power amplifiers is proposed in this thesis. By means of separating the adaptation process from the predistortion itself, a convenient, simple hardware building block for the DPD architecture inside the FPGA {the Basic Predistortion Cell (BPC){ has been identified. A BPC-based architecture provides independency from the particular DPD function derivation method, and it is easily scalable and reconfigurable, depending on the operation mode and degree of impairments introduced by the transmitter chain in each particular case. In order to support those claims and provide experimental evidence, two main different prototyping scenarios have been developed. In the first one, a DPD adaptive linearizer based on the passivity theory (hyperstable systems) has been designed and implemented on a low-cost mixed FPGA/DSP platform. Besides experimental results, complementary signal proces sing techniques to DPD are also addressed, thus giving a wide insight on realistic scenarios of DPD systems. In the second scenario, an advanced, adaptive DPD system aimed at compensating not only PA's nonlinear behavior, but also its memory effects, is presented. It is based on a Nonlinear Auto-Regressive Moving Average7 structure which is mapped into hardware using a BPC grid-structure. Besides the experimental results on PA efficiency and linearity, FPGA implementation issues {such as adaptation and power consumption{ are also studied. The manipulation of the PA class of operation to improve its efficiency, provided that DPD may be unavoidable due to the impact of memory effects, is discussed as well. Finally, to further improve efficiency, a DPD linearizer with dynamic supply built-in capabilities has been proposed and implemented as discussed in the last part of this thesis. There, an efficient, bandwidth limited, switched DC-DC converter is in charge of the PA supply modulation. The thorough design procedure targeting a FPGA implementation shows how the necessary functions for commanding the supply modulator can be seamlessly integrated within the DPD processor. The experimental results highlight how the proposed solution maintains linearity and enhances the PA efficiency when compared to a DPD-only method
Houbloss, Omar. "Étude et conception d'amplificateurs en ondes millimétriques à combinaison spatiale de puissance." Brest, 2005. http://www.theses.fr/2005BRES2015.
Full textEfficient combining techniques are needed for the development of power amplifiers at high frequency. The spatial combining technology, which consists in placing a defined number of plates in a rectangular waveguide, is one of the most advantageous ways in the design of power amplifiers. In fact, this technology affords a power combiner whose insertion losses are independent of the number of active components; a fact not afforded by planar technology where the insertion losses are related to the number of active components. Moreover, spatial combining technology offers a solid and compact structure with the possibility of using either a single mode waveguide or a multi-mode waveguide. With the second option, it is possible to increase the number of plates in order to reach higher power. In this case, the important issue is the control of the illumination in order to ensure the same excitation of all trays. A new multi mode waveguide combiner is presented, it helps limit the spatial amplifier degradations when dealing with a large number of trays
Augeau, Patrick. "Alimentations de puissance agiles en technologie GaN pour l’amplification de puissance RF." Limoges, 2014. https://aurore.unilim.fr/theses/nxfile/default/9021e9e4-b921-4e14-b994-76a04bf6c5db/blobholder:0/2014LIMO4010.pdf.
Full textIn telecommunication systems, the impact of front-end consumption on the system efficiency is one of the most critical issues which drives a lot of research effort. At power amplifier (PA) level, the implementation of efficiency improvement techniques is mandatory. The dynamic biasing technique (envelope tracking) appears as a promising technique for the modern standard communications requirements. In such a technique, the drain supply voltage of the PA is dynamically adjusted in accordance with the value of envelope signal being transmitted. State of the art works focusing on bias modulators for envelope tracking highlight the design complexity of such modulators to meet the expected efficiency, power and speed requirements. In this thesis, innovative topology and design method of GaN-based switching cells is theoretically analyzed and validated by non-linear transient simulations. Such improvements of switching cells are validated by two different demonstrators which are realized in high-frequency, high-power GaN HEMT technology. The first modulator is a DC-DC converter driven by a Pulse Width Modulation (PWM) signal, in order to perform a continuous tracking of the drain supply envelope. The second modulator operates in switching mode in order to perform a discrete tracking of the drain supply envelope. This last modulator was coupled to a RF power amplifier to experimentally demonstrate its efficiency without negative impact on PA linearity
Yattoun, Ismail. "Etude et mise en œuvre d’un banc de caractérisation fort-signal de transistors en ondes millimétriques : Application à la conception d'amplificateurs de puissance hybrides en bande Ka." Brest, 2006. http://www.theses.fr/2006BRES2016.
Full textThe optimized and efficient design of solid state power tanplifiers (SSPA) require the experimental large-signal characterization of transistors usina a load-pull test-bench. :The purpose is to determine the optimum device'sperfomances which depend on the operating conditions (frequency, bias voltages , input power) and loading-conditions. The optimum load impedances associated with maximum added power or with maximum added power efficiency for a given input power level can be obtained and, as a result, the information derived tiom these measurements maximizes circuit performances with reduced development time. With this approach, the non-lincar model of transistors at high frequencies can also be validated, thus improvise, the reliability of microwave design tools. The characterization of transistors under large signal is performed in the millimetre-wave range using the active loop technique with a new configuration implemented in the test bench. The design of power amplifiers for telecommunication applications at 28/30 GHz or 41 GHz can be therefore carried out
Manago, Michel. "Amplificateurs de puissance a rampes de courant : application aux émetteurs sonars." Nice, 1986. http://www.theses.fr/1986NICE4066.
Full textManago, Michel. "Amplificateurs de puissance à rampes de courant application aux émetteurs sonars." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37600098x.
Full textMouatakif, Imad. "Simulation hydrodynamique bidimensionnelle de structures MISFET InP : analyse physique et étude expérimentale pour l'amplification de puissance hyperfréquence." Lille 1, 1993. http://www.theses.fr/1993LIL10165.
Full textChaker, Ammar. "Influence de l'amplificateur de puissance sur une chaîne de transmission multiporteuses : prise en compte de l'effet mémoire." Cergy-Pontoise, 2004. http://www.theses.fr/2004CERG0196.
Full textNew transmission techniques require from the amplifier to make a trade off between efficiency and linearity, particularly if the signal presents a non constant envelop. The work of the thesis concerns the influence of the distortions introduced by the power amplifier, particularly the high frequency memory effect, over the OFDM multicarrier system. An OFDM transmission chain is built then the circuit of power amplifier is conceived and characterized and the influence of its nonlinearity over the OFDM system is studied. Memory effect is analyzed and then represented in the OFDM system by a Wiener model which allowed to propose a compensation method of this effect of an amplifier working in the linear region. An adaptive method is proposed which takes into account the power dependency of the memory effect and performs a better compensation in the nonlinear region
Luque, Yohann. "Contribution à la réalisation d’amplificateurs de puissance en technologie CMOS 65 nm pour une application au standard UMTS." Thesis, Bordeaux 1, 2009. http://www.theses.fr/2009BOR13894/document.
Full textMallet, Clément. "Prédistorsion analogique pour amplificateurs de puissance en bande Ku (13,75 - 14,5 GHz)." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2287.
Full textThe research reported in this PhD Thesis is focused on power amplifier wideband linearization by analog predistortion. This work aims to reduce the spectral regrowth due to their nonlinear response over the satellite transmission. This dissertation starts with a presentation of power amplifiers used in transmitters. Through it, we expose their nonlinearity effects on the signal quality. To overcome those effects, the lattest linearization methods were reviewed, highlighting their strengths and weaknesses. Based on this state of art, an analog predistortion structure was identified. It relates to a reflective structure made up of Schottky diodes, of which a part of this thesis is devoted to the analysis of its nonlinear behavior. Drawn on simulations and measurements, this analysis led us to the implementation of the reflective structure for the purpose of a traveling wave tube amplifier linearization over the Ku band. Our work was then directed towards to a new more innovative structure built on two predistortion circuits wired in series. This new structure gets a more flexible and accurate configuration compared to the previous one and allowed us to obtain better results regarding linearity improvement. The last part of this thesis work is dedicated to an experimental approach of two base band digital predistortion methods. The aim of this approach rests on the achievable enhancement of TWTA linearity and the comparison between the results obtained with the analog predistortion
Abi, Hussein Mazen. "Linéarisation des amplificateurs de puissance : prédistorsion numérique adaptative en bande de base." Nantes, 2009. http://www.theses.fr/2009NANT2036.
Full textThis work deals with the linearization of power amplifiers. The aim is to evaluate experimentally linearization performance of digital baseband predistortion techniques and to propose some novel efficient implementation approaches. First, the traditional study based on power series modeling of the PA was repeated. Nonlinear phenomena were described and quantified. In the second part, we present a state of the art on the various linearization techniques. The most important part of this study was dedicated to the adaptive digital baseband predistortion technique. A new method for the implementation of digital predistortion was then proposed. This method was validated with simulations under Matlab and with measures. Its performances were compared to other classical implementation methods. An investigation on implementation complexity was also realized when continuous adaptation is adopted. The proposed method forms a good compromise between complexity and speed of convergence. The last part of this thesis was devoted to measurements. An automated measurement test bench has been specifically developed for the evaluation of digital baseband predistortion techniques. Two sets of measurements with two amplifiers, low and high power amplifiers, were carried out. The aim was to evaluate experimentally the performances of the proposed method and to highlight the memory effects in high power amplifiers, and evaluate the performance of digital predistortion techniques in this case
Fellon, Philippe. "Étude théorique et expérimentale de composants MISFET au phosphure d'indium pour l'amplification de puissance hyperfréquence." Lille 1, 1990. http://www.theses.fr/1990LIL10049.
Full textKassmi, Kamal. "Transistors VDMOS pour amplification de puissance en bande UHF." Toulouse 3, 1993. http://www.theses.fr/1993TOU30137.
Full textLecheminoux, Laurent. "Analyse de l'influence des non-linéarités de l'amplificateur de puissance dans une liaison de communication numérique RF." Université de Marne-la-Vallée, 2000. http://www.theses.fr/2000MARN0089.
Full textHuin, Francis. "Etude des formes d'ondes permettant une optimisation des performances des amplificateurs de puissance : application à la conception d'amplificateurs, à faible tension de polarisation, pour les communications mobiles." Limoges, 2001. http://www.theses.fr/2001LIMO0005.
Full textCottais, Emmanuel. "Linéarisation d'amplificateurs de puissance large bande par prédistorion adaptative en bande de base." Nantes, 2005. http://www.theses.fr/2005NANT2070.
Full textIn order to have a good autonomy with the mobile, it is necessary to use a high-efficiency power amplifier. Furthermore, the amplifier must be linear to respect the spectral constraints imposed by the telecommunications norms. That is why since several years, techniques to linearize a high efficient power amplifier have been proposed. The purpose of this study is to design a complete power amplifier linearization system destinated to radio-mobile application. This linearization technique is based on adaptive baseband predistortion. The amplifier is represented by Hammerstein model and the proposed adaptive predistortion technique is based on this model. Simulation results show the capacity of the method to linearize power amplifiers. Experimental results confirm the feasibility and the advantages of this new method
Ciochina, Cristina Ioana. "Conception d’une couche physique pour la liaison montante dans des systèmes de radiocommunications mobiles cellulaires." Paris 11, 2009. http://www.theses.fr/2009PA112300.
Full textSingle Carrier FDMA (SC-FDMA) combining multi-carrier-like multiple access with single-carrier-like envelope fluctuations was chosen for the air interface of future wireless communication systems. This thesis proposes a physical layer design for an uplink system based on SC-FDMA and equipped with multiple transmit antennas. Taking into account the tight implementation constraints at the mobile terminal and the presence of a nonlinear power amplifier, we show the importance of the in-band and out-of-band regulation constraints on the performance of the air interface. In realistic propagation scenarios, SC-FDMA brings significant improvements with respect to its competitors especially for users sensitive to high dynamic variations of the signal envelope. This is typically the case of cell-edge users having limited a priori knowledge of the propagation channel and needing to employ open-loop transmit-diversity techniques to improve their propagation conditions. We propose a new method allowing space-frequency transmit diversity in an SC-FDMA system that keeps both the uplink framing flexibility and the low envelope variations of the signal. This new method designed for two transmit antennas is extended to four or more transmit antennas in the space-frequency or space-time-frequency domains. We also expand these strategies to spatial multiplexing so as to benefit from transmit diversity to increase of the cell and/or user throughput multi-user scenarios and/or in combination with spatial multiplexing techniques. Our analytical and numerical shows the improvements brought by the proposed techniques compared to conventional ones in a vast number of practical scenarios
Cordier, Christophe. "Amplification linéaire de puissance dans la gamme millimétrique : étude de la méthode par ré-injection et de la conception d'un module linéaire." Lille 1, 2001. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2001/50376-2001-337.pdf.
Full textDupuy, Alexandre. "Amplificateurs de puissance en technologie MIC à très haute efficacité et forte linéarité." Nice, 2006. http://www.theses.fr/2006NICE4022.
Full textThe different works conducted on this thesis were to design power amplifiers with high efficiency and high linearity by using different schemes. A power combining methods for tunnel diode oscillators using the infinite wavelength phenomenon was also realized. The first project had presented a new technique called the “Enveloppe Delta Sigma Modulation (EDSM)”, which only retains the advantages of two well known techniques, the Kahn technique (EER) and the Sigma-Delta modulation. The EDSM can achieve a high efficiency and a high linearity, and a low pulse sampling rate. In the second project, high efficient power amplifiers were realized using the interesting properties of metamaterials. The use of these metamaterial permits a size reduction of the power amplifiers and consequently of the associated losses. A class F and inverse class F power amplifier were presented different power combining methods for tunnel diode oscillators using the infinite wavelength phenomenon. Two different structures based on metamaterial were used to design the oscillator, one uses a zero-degree lines and the other one uses a zeroth order resonator
Lago, Laure. "Amplification fibrée de forte énergie pour les lasers de puissance." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10137/document.
Full textThis work concerns the development of a double-clad ytterbium-doped single-mode microstructured flexible fiber-based amplifier, in the nanosecond, multi-kiloHertz and milliJoule regime, for large-scale laser facilities seeding. We have used a multi-stage master oscillator power amplifier fibered architecture. A numerical model of ytterbium-doped double-clad fiber-based amplification, including amplified spontaneous emission, was developed in order to study the behaviour of such amplifier and to correctly design the experimental set-up. This model was completed by a feed-back algorithm to numerically predict the optimal temporal shape to compensate the gain saturation process. We demonstrated experimental results in good agreement with numerical simulations, with the following performances: 0.5 mJ pulse energy, at a frequency repetition from 1 kHz to 10 kHz, with a narrow bandwidth spectrum centred at 1053 nm wavelength, with 10 ns pulse duration on a perfect super-Gaussian temporal profile, an optical signal-to-noise ratio better than 50 dB and a polarization extinction ratio of 20 dB. We checked that the beam quality was diffraction limited, with an M² measurement of 1.1. Moreover, the system can deliver energies up to 1.5 mJ. Then, we took the advantage of such results to amplify chirped pulses. We demonstrated 0.7 mJ pulse energy, with 570 fs duration at 10 kHz repetition frequency
Friedrich, Guy. "Contribution à l'étude des possibilités de l'amplification à découpage en puissance élevée." Compiègne, 1986. http://www.theses.fr/1986COMPD046.
Full textThe aim of this work is to evaluate the feasibility of the design of a PWM amplifier able to restitute any input signal in the power range of 400 V – 20 A. Two aspects have been examined : a study of a switching technique able to minimize loads on switches and improve dynamic performance ; a study of a fast switch. After a bibliographic investigation into PWM strategies generally used, an accurate study has been made of one of them : “instantaneous feedback”. This study has been made with a numeric simulation, because the non-linearity of the system limits the validity of an analytic model. This simulation shows the performance of the strategy by studying the influence of the variation of each main component of the amplifier. High sensitivity of the system to delays demands design of high speed switches. Performance and power range impose the use of transistors of different technologies. Two structures are studied and tried (REC, CASCODE). The commutation times are equivalent, but the reliability of the CASCODE structure is greater at high frequency. Four prototypes using these techniques have been constructed, allowing us to verify the validity of the numerical model and the interest of the “instantaneous feedback” strategy. Problems due to electromagnetic perturbations generated by high speed switches have been resolved. Correct performance has been obtained at 350 V – 20 A. A comparison with a more popular strategy, “natural sampling”, shows that the instantaneous feedback has a significant advantage for restitution of signals whose frequency is near the chopping frequency. However, this strategy is not able to restitute correctly low amplitude input signals
Besombes, Florent. "Modélisation électrothermique comportementale d'amplicateurs de puissance microondes pour les applications Radars à bande étroite." Limoges, 2012. https://aurore.unilim.fr/theses/nxfile/default/c747e865-0a15-4d10-bcdb-fef35131b91a/blobholder:0/2012LIMO4002.pdf.
Full textThis work deals with the electrothermal behavioral modeling of microwave power amplifier including the load-pull effects, for narrow band radar applications. An extension of nonlinear scattering functions is proposed for modeling large ouput impedance mismatches in the presence of high frequency memory and thermal effects. Its combines a nonlinear scattering functions cell for the electrical response with a reduced order thermal model. The model has been implemented in the system-level simulator Scilab/Scicos. The model identification from time domain load-pull measurements and thermal simulations of the 3D integration of an X band HBT AsGa/GaInP power amplifier is presented. They demonstrate the model ability to accurately reproduce transients behaviors of the electrical signals and temperature within the power amplifier for arbitrary load impedances
Launay, Frédéric. "Contribution à la modélisation comportementale des amplificateurs de puissance utilisés en communications radio mobiles." Nantes, 2003. http://www.theses.fr/2003NANT2045.
Full textThis thesis deals with the development of a behavioral model of microwave power amplifiers. The main goal is to obtain a non linear model of the amplifier taking into account the global commu-nication link performance. The model is developed from readily available measured or simula-ted one tone or two tones signals. Starting from the memoryless behavioral model, we developed two models. The first one allows to take into account the HF memory phenomena of the power amplifier, and the second takes into account both HF and BF memory phenomena. Such a model can be used in the context of high bit rate and broadband communication systems to evaluate the amplifier performance in real ope-rating condition. An analytical formulation is finally proposed in order to analyse the spectral regrowth (ACPR) at the output of a non linear power amplifier driven by a digitally modulated carrier in digital radio system
Zeleny, Jan. "Compensation numérique des non-linéarités des amplificateurs de puissance avec identification au niveau récepteur." Thesis, Lille 1, 2011. http://www.theses.fr/2011LIL10039/document.
Full textIn this work a novel scheme of predistortion of power amplifier nonlinearities is developed and demonstrated. The originality of the proposed system architecture is that the estimation of nonlinearities is carried out at the receiver thanks to a training sequence, and sent back to the transmitter for predistortion. The proposed architecture achieves efficient compensation of power amplifier nonlinearities on WiMAX and LTE standards without extra hardware. An evaluation of consumption savings is carried out, considering digital consumption of the estimation algorithm at the receiver and predistortion Look Up Table refreshment at the transmitter. The results show that the suggested architecture can be applied for high data rate systems at base stations, relay stations and mobile stations as well
Blache, Fabrice. "Etude et conception d'un système de caractérisation fonctionnelle multiharmonique des transistors de puissance RF et microondes. Application à la mise en oeuvre expérimentale de classes de fonctionnement à haut rendement." Limoges, 1995. http://www.theses.fr/1995LIMO0029.
Full textBerrached, Chamssedine. "Optimisation du rendement en puissance ajoutée des amplificateurs de puissances large bande à base de Nitrure de Gallium." Limoges, 2013. https://aurore.unilim.fr/theses/nxfile/default/6b7cb6f7-e759-43bb-b9c0-8b917ae0ebec/blobholder:0/2013LIMO4040.pdf.
Full textThis report deals with about efficiency optimization for wideband and high power amplifier based on Gallium Nitride powerbar devices. A design methodology is proposed for efficiency improvement for wideband power amplifier. It is based on second harmonics load impedance study and a theoretical analysis of the maximum matching bandwidth to maintain a high efficiency configuration. This study is based on Bode-Fano theorems. This study permit to design a wideband [1-3GHz], high efficiency MIC GaN high power 40W amplifier based on encapsulated bare die GaN device. To reduce significatively the power amplifier size, UMS has developed a quasi-MMIC technology to match GaN powerbar devices. Two high efficiency, wideband high power amplifiers was designed in Quasi-MMIC technology and it shows state of the art results
Aloui, Sofiane. "Design of 60ghz 65nm CMOS power amplifier." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14165/document.
Full textTelecommunication industry claims for increasing data rate in wireless communication systems. The major demand of high data rate applications concerns a large panel of home multimedia exchanging data especially for the uncompressed HD data transfer. The 7GHz band around 60GHz is free of use and fulfils the short range gigabit communication requirements. CMOS technology is most appropriate since it drives a fast time to market with a low cost for high integration volume. However, the use of CMOS technology is challenging to satisfy loss and performance trade-off under power constraints. This thesis aims at designing power amplifiers operating at 60GHz with 65nm CMOS technology from STMicroelectronics. This approach is progressive because it is necessary to analyze and optimize the performance of passive and active components constituting the power amplifier using electromagnetic and microelectronics software. Finally, power amplifiers have been made. Their performances met specifications originally defined
Delemotte, Pascal. "Réalisation expérimentale d'un banc d'essai d'intermodulation "noise power ratio" : application à l'analyse de HEMTs et de MMICs de puissance en bande Ka." Lille 1, 2002. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/2002/50376-2002-9.pdf.
Full textMuller, Dorothée. "Optimisation des potentialités d’un transistor LDMOS pour l’intégration d’amplificateur de puissance RF sur silicium." Limoges, 2006. https://aurore.unilim.fr/theses/nxfile/default/8c93dadd-0847-4920-96c8-e1f79fc507d7/blobholder:0/2006LIMO0041.pdf.
Full textThe RF power amplifiers realized from components stemming from III-V technologies are at present the most successful because of their intrinsic physics properties. Nevertheless these technologies do not completely answer the requirements of the radiotelephony mobile market in term of cost of returns. New generations of MOS power transistors on silicon such as the LDMOS appeared to answer this need. These power devices have the advantage to be realized in mature technologies and offer very honourable performances to much lower costs, what is a major trump card in the current context where the cellular telephone market is very sensitive to the price of components. This thesis deals with a reflection on the potentialities of a transistor LDMOS integrated into a 0. 25 µm BiCMOS technology and on the optimization of its performances for RF power amplifiers circuits integrated on silicon. Firstly, the LDMOS transistor physical mechanisms and also the main reasons that make the LDMOS transistor a better candidate than the MOSFET for radio frequencies applications are presented. The work described afterward articulates around the realization and the optimisation of the LDMOS transistor for RF power applications. In fact, the technological parameters are determined in order to get a device, which output characteristics match the ones fixed by the application. Then an analysis is made to identify the device intrinsic and extrinsic parameters, which are susceptible to improve its dynamic performances. For it the effect of the modifications of architecture, layout as well as the manufacturing process on the dynamic characteristics were studied and ended in promising results. Indeed the performances of the optimized transistor LDMOS reach the state of the art
Hazouard, Mathieu. "Conception et réalisation d'amplificateurs micro-ondes de puissance à l'aide de la méthode des fréquences réelles." Bordeaux 1, 2002. http://www.theses.fr/2002BOR12434.
Full textPiotrowicz, Stéphane. "Intégration monolithique de HEMT's sur substrat InP en vue de l'amplification de puissance en bande V." Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-253.pdf.
Full textCesari, Albert. "Implémentation de techniques de linéarisation et d'amélioration du rendement pour les amplificateurs de puissance RF." Phd thesis, Université Paul Sabatier - Toulouse III, 2008. http://tel.archives-ouvertes.fr/tel-00538808.
Full textGiry, Alexandre. "Étude des potentialités des technologies CMOS avancées pour les radiofréquences : application aux amplificateurs de puissance." Grenoble INPG, 2001. http://www.theses.fr/2001INPG0057.
Full textMEZUI-MINTSA, RAPHAEL. "Conception, realisation et caracterisation des amplificateurs de puissance en technologie bipolaire a heterojonction gaalas/gaas." Limoges, 1992. http://www.theses.fr/1992LIMO0156.
Full textGamand, Florent. "Amplificateurs de puissance et convertisseurs DC/DC à base de GaN pour des applications hyperfréquences." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10064/document.
Full textHigh efficiency is a key element in modern telecommunication systems, especially in RF power amplifiers. Efficiency has to be as high as possible in order to reduce power consumption thus minimising working cost, maximising autonomy and improve system reliability. In order to increase global efficiency of a power amplifier, dynamic biasing, based on the association of an amplifier and a DC/DC converter, is often used. GaN HEMTs enable high RF power at high frequencies, moreover their capability to switch very quickly and their low resistive losses make them good candidates for both power amplification applications and high speed, high efficiency commutation applications, like DC/DC converters used in dynamic biasing systems. The first part of this manuscript is dedicated to GaN transistors properties and their advantages compared to other semi-conductors for commutation and RF amplification applications. Their characterisation and modelling is also discussed. The second chapter is dedicated to the design and characterisation of high speed DC/DC converters for dynamic biasing applications. The last part approaches high efficiency GaN power amplifiers design in C band for telecommunication applications. The association of a DC/DC converter, designed in chapter II, and a GaN power amplifier in S band in the context of dynamic biasing is also presented and the obtained efficiency improvement is reported
Bourcier, Eric. "Analyse de fonctionnement en amplification de puissance en bande Ka des transistors HEMT des filières AsGa et InP." Lille 1, 1998. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1998/50376-1998-9.pdf.
Full textLabrousse, Nicolas. "Développement de fonctions intégrées incluses dans les transitors RF de puissance conçus en technologie LDMOS." Limoges, 2009. http://www.theses.fr/2009LIMO4063.
Full textThese works relate to the study and design of integrated circuits on the LDMOS platform technology. These circuits are dedicated to applications around Freescale Semiconductor power amplifiers for radio base stations of third generation cellular. The analysis of a new 3-ports transistor integrated into LDMOS technology, is conducted to highlight their interest in designing new functions around power amplifiers. The methodology of 3-port characterization of this transistor is exposed. Thereafter, this characterization is used for the implementation of a nonlinear model using a so-called exploded topology. The purpose of this work concerns the design of various structures of Variable Voltage Attenuators. A comparative study of these topologies performances is conducted to select the one which achieves the best performances. Finally, the topology which achieves an attenuation dynamic exceeding 20 dB with insertion loss of 3. 8 dB, (in the UMTS band : 2. 11-2. 17 GHz), is used to design a gain compensation as a function of temperature for amplifiers. For this, a integrated circuit control is designed to monitor the level of attenuation of the variable attenuator
Zoyo, Marc. "Conception et réalisation d'amplificateurs de puissance micro-ondes à l'état solide et à fort rendement pour des applications spatiales bande S et bande X." Toulouse 3, 1996. http://www.theses.fr/1996TOU30175.
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