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Low noise amplifier for UHF band
Horký, Stanislav ; Baran, Ondřej (referee) ; Kasal, Miroslav (advisor)
The subject of this bachelor's thesis is description and design of low-noise RF amplifiers. This work is also focused on design and simulations of amplifier in Ansoft Designer software. In this thesis is in detail described design of amplifier ATF 54143, mainly focused on stability, biasing and noise matching. For the needs of RF applications are described a few types of filters, with his design and realization
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Transformations in the behavior of football funs in the 1st and 2nd Czech leagues (Concentrating on developments from 2006)
Baran, Ondřej ; Mücke, Pavel (advisor) ; Diestler, Radek (referee)
Sport is one of the most important leisure activities in today's Euro-American civilisation. We are not talking here only of active engagement in sport, but also of sport as a source of mass-entertainment for millions of people. In this thesis I focus above all on the conduct of spectators in football stadiums in the Czech Republic. I will approach this theme by way of oral history, where the narrators providing me with interviews regularly go to matches in the First and Second Divisions of the Czech Football League. I concentrate here above all on the motivation and attitudes of the various groups of spectators to the events in the football stadiums, and I pick out three groups in particular: normal fans, ultras and hooligans. I endeavour to delineate the main differences between these groups which, in my view, are rooted not only in their varying motivation, but also in their modes of communication, as well as in their social composition and their age-structure. At the same time, however, I also attempt to highlight the specific environment of football terraces in which, though all the spectators may conduct themselves as individuals, they at one and the same time become, in a certain way, part of a mass of spectators, and they may therefore be in certain circumstances overcome by the situation...
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Design for Production of Scanning Product
Baran, Ondrej ; Sliwková, Petra (referee) ; Sedlák, Josef (advisor)
The object of the bachelor thesis was the design, manufacture and construction in progress of a prototype scanning appliance. Each part of appliance was manufactured in 3D modelling environs Autodesk Inventor. For plastic parts construction was used additive technology Fused Deposition Modeling, with a printer uPrint. A part of thesis was teoretical familiarization of knowledge from the appliances and additive technology Rapid Prototyping area. A part of experimentation was consecutive solving mechanical design, modelling, manufacturing and construction issues. The ending of the thesis was consisted of discussion.
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LNA for the APT signals receiver
Žúrek, Dan ; Urbanec, Tomáš (referee) ; Baran, Ondřej (advisor)
This bachelor thesis is dealing with design, realization and optimization of the LNA (Lownoise amplifier) for receiving of APT signals from the NOAA weather satellites in 137 MHz – 138 MHz frequency band. The first part of this work is aimed on critical parameters of the amplifier and the filter circuits especially on a noise figure and a high selectivity. The next part of this project is about the particular concept and simulation of LNA by using the Ansoft Designer software. The printed circuit board is realized in the Cadsoft Eagle. The final part of this bachelor thesis is dealing with a production of such amplifier together with its measurement and testing in a real operation of receiving APT signals.
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Low noise amplifier for UHF band
Horký, Stanislav ; Baran, Ondřej (referee) ; Kasal, Miroslav (advisor)
The subject of this bachelor's thesis is description and design of low-noise RF amplifiers. This work is also focused on design and simulations of amplifier in Ansoft Designer software. In this thesis is in detail described design of amplifier ATF 54143, mainly focused on stability, biasing and noise matching. For the needs of RF applications are described a few types of filters, with his design and realization
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GPS Two-Stage Low Noise Amplifier
Šindler, Pavel ; Kasal, Miroslav (referee) ; Baran, Ondřej (advisor)
This work deals with a design of a low noise amplifier for the GPS band. The first part shortly describes properties of GPS signals and possible jamming sources. In the next chapter, basic parameters of low noise amplifiers, ways of the amplifier stability determination and stabilization are described. A summary of methods of a narrowband amplifier design follows. The next chapter contains a short description of filters usable in the designed amplifier. The next part deals with the design of the two-stage low noise amplifier with the help of Ansoft Designer software. The following part deals with the amplifier realization and its parameters measuring. At the end of this work, some experience with GPS signals reception with the realized low noise amplifier, a passive antenna and two different types of GPS receivers are mentioned.
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Studies of Influences of Oscillators Frequency Instabilities in Satellite Communication Systems
Baran, Ondřej ; Baláž, Igor (referee) ; Šimša, Jan (referee) ; Kasal, Miroslav (advisor)
The dissertation thesis deals with a study of an influence of a simultaneous incidence of an additive thermal noise and a multiplicative phase noise on the useful signal transmission in narrowband satellite communication systems. While the additive thermal noise affects the useful signal only on the receiver side of the communication system, the multiplicative phase noise is produced in all system oscillators. One investigates how the receiver filter bandwidth reduction takes effect on the influence of individual noise types. The thesis is divided into four units. The first one (chapters 4 and 5) solves the ways of modeling of both noise types. In the second part (chapter 6), on the simple example, the primary analysis of the phase noise influence is made. Basic modulation schemes used in the satellite communication are also discussed (chapter 7). Third part (chapter 8) is devoted to the modeling of a general digital system with a M PSK modulation made directly on the main carrier wave. The last part (chapter 9) describes the modeling of a digital system with a BPSK modulation on the auxiliary subcarrier wave followed by an SSB modulation on the main carrier wave. General conclusions are deduced from obtained simulation results.
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Adjustable switching power supply
Vyroubal, Rostislav ; Urbanec, Tomáš (referee) ; Baran, Ondřej (advisor)
The aim of this bachelor’s thesis is to create a summary of the convertors, their principles, and to propose the convertor with specific parameters. The printed circuit board is designed for this convertor. Designed convertor is manufactured. Its specific parameters are measured and compared with theoretical parameters. A heatsink is designed for this convertor.
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