Dissertations / Theses on the topic 'Oscillateur puissance'
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Dréan, Sophie. "Oscillateur de puissance en ondes millimétriques." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14726/document.
Full textThis PhD thesis deals with a Power Voltage Controlled Oscillator (VCO) in millimeter waves. The aim is to design this Power VCO in the frequency band used in the standards IEEE 802.15.3c, IEEE 802.11ad and ECMA TC48, meaning from 56GHz to 65GHz. The principle of this oscillator is developed around a power amplifier in a loop, generating an oscillating system. The power amplifier is developed in a two-stage topology. The power stage is composed with a 60GHz class E cascoded amplifier and the driver stage is composed of a 60GHz class F amplifier. The feedback of the loop is based on a vector-modulator. The circuits have been realised in 65nm CMOS technology from STMicroelectronics
Madureira, Heider Marconi Guedes. "Study and design of CMOS RF power circuits and modulation capabilities for communication applications." Thesis, reponame:Repositório Institucional da UnB, 2015. http://www.theses.fr/2015BORD0093/document.
Full textThis work presents the study, design and measurement of RF circuits aiming communication applications. The need for flexible and reconfigurable RF hardware leads to the need of alternative transmitter architectures. In the center of this innovative architecture, there is thepower oscillator. This circuit is composed of a power amplifier in a positive feedback loop soit oscillates. As the circuit under study is mainly composed of a power amplifier, a study on power amplifier is mandatory. Modern CMOS technologies impose difficulties in the efficient RF generation due to low breakdown voltages. In order to reduce the voltage stress on the transistors, wave form-engineering techniques are used leading to the use of class EF2. Thedesign and measurement of a class EF2 power amplifier and power oscillator are shown. Thecircuits were implemented in standard STMicroelectronics 0.13um CMOS. Correct behaviorfor the circuits was obtained in measurement, leading to a first implementation of class EF2 inRF frequencies. From a system perspective, the proposed architecture is shown to be flexible and able to generate different modulations without change in the hardware. Reconfigurability is shown not only in modulation but also in output power level. The limitations of this architecture are discussed and some mathematical modeling is presented
Joër, Jean-Pierre. "Oscillateur additionneur de puissance microonde à transistors et à résonateurs diélectriques tubulaires." Limoges, 1985. http://www.theses.fr/1985LIMO4007.
Full textNadeau, Marie-christine. "Oscillateurs picosecondes de forte puissance moyenne à faibles bruits." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14137/document.
Full textFor medical or cultural heritage applications, a compact, monochromatic, Compton x-ray source system needs a powerful, few picosecond laser source. To obtain high-x-ray-flux, the laser should be coupled to a high-finesse Fabry-Perot cavity to reach the required laser power. Therefore, the laser should have a good beam quality and low noises. In order to reach theses requirements, we have studied passive mode-locking oscillators delivering more than 10 W average power and between 10 and 20 ps pulse duration.Two high-power oscillators have been designed and implemented: a side-pumped Nd:YAG and an end-pumped Nd:YVO4 oscillator. With the second oscillator, we have studied the experimental reduction of pulse duration. We obtained a decrease from 46 ps to 12 ps in the continuous-wave mode-locked regime. Those experimental results have been explained by a numerical simulation and furthermore, we have developed an analytical solution to predict the pulse duration of such oscillator. Finally, we studied the noise characteristics of the Nd:YVO4 oscillator. Our measurements have shown that a high-power oscillator might be as low-noise as other low-power, low-noise oscillators. In conclusion, we have developed a powerful (20W), 1064nm-wavelength, short-pulses (15ps), good-beam-quality (M2<1.2) and low-noise free-running oscillator (timing jitter <1.2 ps RMS 100Hz-1MHz). Therefore, our high-power oscillator is an excellent candidate to be part of a compact, high-flux, monochromatic x-ray source
Fadhuile-Crepy, François. "Méthodologie de conception de circuits analogiques pour des applications radiofréquence à faible consommation de puissance." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0028/document.
Full textThesis work are presented in the context of the integrated circuits design in advanced CMOS technology for ultra low power RF applications. The circuits are designed around two concepts. The first is the use of the inversion coefficient to normalize the transistor as a function of its size and its technology, this allows a quick analysis for different performances or different technologies. The second approach is to use a figure of merit to find the most appropriate polarization of a circuit based on its performance. These two principles were used to define effective design methods for two RF blocks: low noise amplifier and oscillator
Rudelle, Marie-Irène. "Oscillateurs microondes modules lineairement en frequence." Paris 6, 1987. http://www.theses.fr/1987PA066026.
Full textLy, Aliou. "Développement d’un oscillateur paramétrique optique continu intense et à faible bruit pour des applications aux communications quantiques." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS528/document.
Full textLong distance quantum communications are limited to few tens of km due to the attenuation of light in telecom fibres. Quantum repeaters (quantum relays synchronized by photonic quantum memories) were introduced in order to increase distances. Or, currently, the most efficient memories do not operate at wavelengths in the telecom C band. In order to take advantage of these memories, the use of quantum interfaces (second order nonlinear medium) was proposed as an alternative. Thus, by adding by sum frequency generation a pump photon at an appropriate wavelength to the telecom photon carrying the information, one transfers the information to a wavelength compatible with these memories, and this with a preservation of the information initially carried by the telecom photon. Our aim is thus to build a continuous-wave singly resonant optical parametric oscillator (cw SRO) which will provide a wave at 1648 nm that will be frequency summed to telecom photons at 1536 nm to transfer the information to a photon storable into alkali atoms based memory. To efficiently transfer the information, the cw SRO has to fulfill some requirements: a high spectral purity (linewidth ~kHz), a high output power (~1 W) and a wavelength longer than that of the telecom photon to be converted. To this aim, we use the non-resonant wave of a cw SRO. The first work done during this thesis was to experimentally prove the possibility to have both high output power and high spectral purity from a cw SRO. By reusing a cw SRO already built during our previous works, we were able to stabilize at the kHz level the frequency of the non-resonant wave at 947 nm (signal wave) of this SRO, with an output power of more than one watt. Then, we built the cw SRO of which non-resonant wave at 1648 nm (idler wave) has been frequency stabilized below the kHz level along with an output power of the order of one watt. We next studied the long term stability of the idler wavelength at 1648 nm. We have measured frequency drifts of the order of 10 MHz/mn. These drifts originating mainly from the reference cavity to which the SRO is locked, can be reduced by, firstly, an active control of the cavity and by, secondly, the use of robust frequency stabilization techniques
Mandrillon, Vincent. "Réduction de la puissance de commande de microactionneurs au voisinage d'une instabilité magnétique ou élastique : application au bilame magnétostrictif." Université Joseph Fourier (Grenoble ; 1971-2015), 2000. http://www.theses.fr/2000GRE10212.
Full textGrot, Sébastien. "Montée en puissance de lasers et d'amplificateurs à fibres dopées Ytterbium en régime continu et d'impulsions." Phd thesis, Université Rennes 1, 2006. http://tel.archives-ouvertes.fr/tel-00079671.
Full textSnyder, Aaron Francis. "Les mesures synchronisées par GPS pour l'amortissement des oscillations de puissance dans les grands réseaux électriques interconnectés." Phd thesis, Grenoble INPG, 1999. http://www.theses.fr/1999INPG0135.
Full textAt the present time, power Systems are being operated closer and closer to their stability limit. This. Condition is due to current économic, political and ecological constraints, under which power System operators are Iimited to serving the actual power demand by pushing the operating point closer to the generation and tie-line stability limits. However, due to the weakness of these tie-lines, oscillations are often, created between the different generating stations in the power system. These so called inter-area oscillations are visible on the rotors of the generators, as well as in the fie-line power, and may create severe stability problems To damp the inter-area oscillations and avoid the stability problems, a Remote Feedback Controller (RFC) is used. The RFC uses input signals from the generator where it Ls installed and alsoltom a remote generator. Thèse inpuî signais, both local and remote, are sytichronized via the Global Positioning System (GPS) satellites. The RFC is tuned via the use of residues, as well as recent convex programming techniques that include the application of linear matrix inequality (LMÏ) constraints. The work presented in this dissertation deals with the problem of damping the inter-area oscillations present in two test Systems (4- and 29-machines) via the optimal siting of a RFCs containing local and remote input signal synchronized by GPS satellites. The iRFCs are then tuned through the use of a method based on residues and LME constrained convex programming algorithm. These techniques yield RFCs that are robust for a wide range of operating conditions (up to the limit of the power System) and that have a higher degree of performance (damping) than typically installed controllers. Tbe RFCs are also capable of functioning when faced with the problems of input signal delay or input signal loss
Thibault, Florent. "Nouvelles structures pour lasers à impulsions brèves de forte puissance : conception et réalisation d'amplificateurs/lasers guides d'onde élaborés par épitaxie en phase liquide et démonstration de lasers femtoseconde en Y2SiO5 : Yb et Lu2SiO5 : Yb." Paris 11, 2006. http://www.theses.fr/2006PA112272.
Full textYb-doped yttrium and lutetium orthosilicates, Y2SiO5:Yb and Lu2SiO5:Yb respectively, exhibit spectroscopic properties favorable to an efficient laser operation in both high power cw and femtosecond regime. Their first diode-pumped femtosecond operation demonstration lead to exceptional performances in terms of output power and efficiency. In order to realize compact and efficient solid-state laser devices using those materials, we chose a configuration with an Yb-doped medium planar waveguide geometry, grown by liquid phase epitaxy, face-pumped by a single laser diode bar. The growth of highly doped Y2SiO5:Yb layers, within a large range of compositions and thicknesses, was demonstrated. The refractive index increase due to the substitution of the various dopants is analyzed. The layers spectroscopic properties are similar to the bulk ones, with an noticeably higher crystalline quality. The Yb ion lifetime evolution with respect to its doping shows up a particularly low decrease, proof of a low concentration of extrinsic quenching centers. The covered YSO:24%Yb waveguides exhibit lower than 0. 3dB/cm propagation losses, and provided up to 2. 9dB/cm net amplification at 1082nm with a single mode output. The realization of the first diode-pumped monolithic cw waveguide lasers was also demonstrated. For a 4% output coupler, they provided up to 340mW at 1082nm with a 14% slope efficiency
Bebe, Manga Lobe Joseph Patient. "Développement de diodes laser à faible largeur de raie pour le pompage atomique et d'un MOPA (Master Oscillator Power Amplifier) à 780 nm pour le refroidissement d'atomes de Rubidium et la réalisation de capteurs inertiels." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS225.
Full textThis thesis has been realized in III-VLab in collaboration with the South Electronic Institute in Montpellier. The aim of this work focuses in one hand, on the performance improvement of DFB's diode lasers emitting at 780 nm, and the advanced design of a compact semiconductor laser diode (Master Oscillator Power Amplifier), integrating monolithically the master oscillator (DFB for Distributed Feedback laser); in the other hand, using the noise phenomenon’s studies as a tool, for validating of our laser technologies. The Developments round the 780 nm wavelength, have been divided into different thematic: Fabry-Perot and DFB, Semiconductor Optical Amplifiers (SOA), MOPA, and the lasers noise’s study. We have studied structures with different quantum well thickness (160Å, 135 Å and 145 Å). The comparison of global performances of broad area lasers from these different structures, far to being obvious, allowed us to choose the one that integrates the 160-Å-thickness of quantum-well, for the realization of ridge Fabry-Perot lasers of 3 to 4-µm-of width. We obtained with broad area lasers, as cleaved, with 3-mm cavity lengths, an output power around 5 watts per facet, in continuous bias current around 10 AModellings and electro-optics characterizations performed on ridge Fabry-Perot lasers, allowed to refine DFB lasers at 780 nm, in comparison of the existing building blocks in the lab; we proposed new optimized structures with Large and Super Large Optical Cavities(LOC and SLOC), in terms of optical output power, beam and spectral qualities.The noise measurements with electrical noise modelling, allowed us to extract a value of Hooge’s parameter of 2,1.10^-3, quite in agreement with literature for such lasers, which corresponds to a good material quality and laser technology.Different types of flared SOA have been designed, realized and characterized. The characterizations of various SOA geometries, have given in general, values of gain between 19 dB to 25 dB. With SOAs of types: fully Index Guiding (IG), fully Gain Guiding (GG) and Mixed Guiding (MG), we have respectively obtained 500 mW, 750 mW and 1 W. All the results obtained with these structures are promising for monolithic integration with DFB. Regarding the MOPA, three approaches have been studied. The straight MOPA, the approach of SOA and DFB with 7° tilt(relative to the normal to cleaved facets), and the most complex, but promising approach, integrating the SOA with 7° tilt, and straight DFB, with a bend section between them. By taking into account all the results obtained on Fabry-Perot lasers, DFB, and SOA results, we were able to propose original MOPA designs. The layout drawing has been realized, all the MOPA configurations and additional, DFB and SOA devices, have been included on it. They will be used as test structures for characterizations
Mohsen, Ali. "Harmonic feedback multi-oscillator for 5G application." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0335/document.
Full textThe PhD project is about harmonic oscillator; the oscillator depends on the fundamental frequency signal at 25 GHz which is amplified using an LNA and power amplifier in order to generate third harmonic signal at 75 GHz at the output, and feedback the fundamental signal to ensure the continuity of the oscillation. A diplexer is used to separate between both frequencies at the output stage, taking in consideration the improvement of the output power, phase noise, and the power added efficiency PAE at the candidate frequency of 5G application. The transistor technology chosen is the 28nm FDSOI from the STMicroelectronics
Friscourt, Marie-Renée. "Étude des dispositifs à transfert électronique pour la génération de puissance en gamme millimétrique." Lille 1, 1985. http://www.theses.fr/1985LIL10015.
Full textCros, Dominique. "Les whispering gallery modes des resonateurs dielectriques : application aux oscillateurs et combineurs de puissance millimetriques." Limoges, 1990. http://www.theses.fr/1990LIMO0108.
Full textOlivier, Jean-Christophe. "Modélisation et conception d'un modulateur auto-oscillant adapté à l'émulation d'organes de puissance." Nantes, 2006. http://www.theses.fr/2006NANT2108.
Full textThe work presented in this thesis talk about the optimization of the structure and the control of power emulating systems, called Actives Loads. In order to display very good dynamic performances as well as a very great robustness, these Active Loads use a Resonant Current Controller (RCC) and a Resonant Voltage Controller (RVC). These processes are self-oscillating regulators and are thus by nature strongly non-linear. Also, for an optimal application of these proceses to the Active Loads, the first point presented in this thesis is the modelization of these regulators and the identification of the possible problems, due to their non-linearities. It is then appeared that synchronization phenomena and switching frequency instability can appear if some conditions are not well respected. The second point of this work is the generalization of these modulation processes to any systems, based on a sliding mode control. So, a new structure of Resonant Voltage Controller is proposed, more efficient for the Active Load applications. The experimental results obtained on an experimental prototype show the very great performances of this new process, thus contributing to the improvement of the quality and the precision of old and new generations of Active Loads
Derycke, Alain. "Etudes théoriques et expérimentales des modules préaccordés radiaux : application à l'intégration des composants en ondes millimétriques." Lille 1, 1986. http://www.theses.fr/1986LIL10090.
Full textRamsiI, Abdelkrim. "Modélisation des transistors bipolaires silicium de puissance dans les bandes L et S." Châtenay-Malabry, Ecole centrale de Paris, 1992. http://www.theses.fr/1992ECAP0238.
Full textBeaussart, Stéphane. "Contribution à l'étude du fonctionnement et à l'optimisation des oscillateurs A. T. T. Au silicium de forte puissance en régime d'impulsions courtes à 94 GHz." Lille 1, 1997. http://www.theses.fr/1997LIL10202.
Full textBerbineau, Marion. "Modélisation des dispositifs à jonction P-N : Application aux oscillateurs A.T.T. de forte puissance en bande Ku et à l'étude des régimes transitoires des limiteures à diode PIN." Lille 1, 1989. http://www.theses.fr/1989LIL10081.
Full textWeisz, Mario. "Electrothermal device-to-circuit interactions for half THz SiGe∶C HBT technologies." Thesis, Bordeaux 1, 2013. http://www.theses.fr/2013BOR14909/document.
Full textThe power generate by modern silicon germanium (SiGe) heterojunction bipolar transistors (HBTs) can produce large thermal gradients across the silicon substrate. The device opering temperature modifies model parameters and can significantly affect circuit operation. This work characterizes and models self-heating and thermal coupling in SiGe HBTs. The self-heating effect is evaluated with low frequency and pulsed measurements. A novel pulse measurement system is presented that allows isothermal DC and RF measurements with 100ns pulses. Electrothermal intra- and inter-device feedback is extensively studied and the impact on the performance of two analog circuits is evaluated. Novel test structures are designed and fabricated to measure thermal coupling between single transistors (inter-device) as well as between the emitter stripes of a multi-finger transistor (intra-device). Thermal coupling factors are extracted from measurements and from 3D thermal simulations. Thermally coupled simulations of a ring oscillator (RO) with 218 transistors and of a 60GHz power amplifier (PA) are carried out. Current mode logic (CML) ROs are designed and measured. Layout optimizations lead to record gate delay of 1.65ps. The thermal performance of a 60GHz power amplifier is compared when realized with a multi-transistor array (MTA) and with a multi-finger trasistor (MFT). Finally, perspectives of this work within a CAD based circuit design environment are discussed
Thabet, Hanen. "Validation de la chaîne d'émission pour la conception d'un capteur RF autonome." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4314.
Full textThis work joins in a project consisting in developing prototype of an autonomous and smart RF sensor allowing the realization of a wireless sensor network in an industrial environment. This thesis deals with the study, the design and the realization of the radio-frequency part of the transmitter using the 863-870 MHz ISM band and the CMOS AMS 0.35µm technology. This transmitter includes all the functions from the local oscillator to the power amplifier. The integrated circuit occupies a surface of 0.22mm² and consumes approximately 27mA under a supply voltage of 3.3V. Numerous innovative principles were implemented and validated. All these principles can be easily transposed into other standards of communication and in other frequency bands. The results of the post-layout simulation completely satisfy the specifications and confirm the simulations. Partial experimental characterization validates new architectures proposed
Boucherit, Mohamed. "Etude et réalisation de dispositifs hyperfréquences sur matériaux grand gap : diode à effet tunnel résonant AlxGa1-xN/GaN, transistor HEMT boré à base de nitrure de gallium." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10004/document.
Full textThe work described in this thesis contributes to the improvement on some circuit based on wide band gap semiconductors. The first concerns the oscillators and the second RF amplifiers at microwave frequencies. Components selected to build these two devices are resonant tunneling diodes and high electron mobility transistors. This thesis is divided into two distinct parts:-The resonant tunneling diodes AlGaN/GaN: a software that provides a rigorous description of vertical transport in nitride heterostructures does not exist or are not available in Europe. In this thesis, we developed a model based on the self-consistent resolution of the Schrödinger and Poisson equation using the non-equilibrium Green functions. The strategy employed to obtain some heterostructures free from dislocations is based on the realization of nano-diodes in the following two approaches. The first approach "bottom-up" implements the technique of selective epitaxy on nano-patterned GaN template. The second approach called "top down" is based on the reduction of device size and consequently the number of dislocations. The electrical characteristics of these nano-diodes have been measured by FIB, Nanoprobe and vector network analyzer. The negative differential resistance is studied depending in both direction of bias, electrical treatment, temperature and aluminum incorporation in the AlGaN barriers layers.- The high electron mobility transistors AlGaN/GaN: the second part was aimed to perform a conventional AlGaN/GaN HEMT structure exhibiting in the state of the art performance. To do that, we focused on improving the resistivity of the GaN buffer layer by incorporating either of aluminum or boron. Several positions and thicknesses of BGaN layer in the conventional AlGaN /GaN HEMT structure were tested to determine the optimal structure. Comparative studies between AlGaN/GaN HEMT structures with and without BGaN layer have shown that the use of BGaN layer as a back-barrier drastically improves the carrier confinement in the 2DEG channel and significantly reduces the residual doping of the active area