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Capacitance measurement of high-voltage PN junctions
Derishev, Anton ; Kosina, Petr (referee) ; Boušek, Jaroslav (advisor)
The work deals with the capacitance measurement of high-voltage PN junctions. The work is divided into theoretical and practical parts. The theoretical part presents insight into the fundamental properties of PN junctions and methods for measuring of the capacitance of PN junctions, primarily by C-V measurement. In the practical part, several kinds of measuring circuits are introduced and a suitable method of measurement is found. The calculations of basic parameters - the width of the base and resistivity are presented and discussed. The results were compared with the values obtained by calculation from the technological parameters of the junction.
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Switched power supply
Krist, Jakub ; Kosina, Petr (referee) ; Pavlík, Michal (advisor)
The thesis is focused on design the switching power supply according to Push-pull topology rules. The work describes basic theoretic principles of Push-pull topology with design of circuit and circuit elements.
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Anodic bonding of sandwich structures
Urbánek, Petr ; Kosina, Petr (referee) ; Pekárek, Jan (advisor)
This master thesis deals with the technology anodic soldering. It focuses mainly on soldering sandwich glass-silicon structures. Describes the soldering method and highlights its advantages. Theoretically discusses the different methods used soldering these structures and assess their possible benefits. This work explores practical ways possible soldering methods on a particular device. These different soldering methods evaluated on the basis of achieved quality connections. This thesis examines the anodic soldering at low temperatures, while there are demands on the shortening of the technological process.
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The lamination of Low Temperature Co-fired Ceramic
Hudeček, Ondřej ; Klíma, Martin (referee) ; Kosina, Petr (advisor)
Master’s thesis deals with the optimalization of low-temperature cofired ceramic lamination process that affects the final quality of 3D structures (eg., channels, cavities, membranes, etc.). The paper evaluates the influence of lamination parameters (pressure, temperature, time) on the formation of defects in the structure, which were detected by appropriate methods. The last parts describes designed and simulation cooling water system using LTCC technology.
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Liquid analysis sensor
Hanus, Martin ; Adámek, Martin (referee) ; Kosina, Petr (advisor)
This thesis deals with the mixing of liquids issues. The simulation of structure for mixing of liquids and evaluation of parametres which have most significant influence on mixing of liquids was made with help of COMSOL programm. In the next section of thesis the quality of electrodes used for cyclic voltammetry made on LTCC by thick layer technology was determined. In the end of this thesis the 3D structure for mixing of liquids was made. The quality of mixing was controlled by cyclic voltammetry.
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Flow sensor
Symerský, Tomáš ; Psota, Boleslav (referee) ; Kosina, Petr (advisor)
This diploma thesis is divided into two parts - theoretical and practical. In its first, theoretical part, deals with the theory of fluid and gas flow, heat transfer and diversification of sensors for flow measurement working on the electrical principle. It also deals with thermodynamic principle, which can be used for measuring very small flow and low-temperature ceramics that is used to implement microcanals for sensing very low flows. The practical part of the thesis deals with the very simulation of the entire structure in the program “COMSOL Multiphysics” - both in 2D and 3D views. Then there is shown the implementation and measurement of the flow sensor in a low-temperature ceramics, working on a thermodynamic principle.
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Application interface for handling graphics in VHDL language
Vlček, Petr ; Kosina, Petr (referee) ; Bohrn, Marek (advisor)
The objective of this thesis is creating interface for the picture generator. The interface generates a VGA signal with possibility of 4bit color depth. The interface controls two chips of one port SRAM IS61 witch is supplied with Digilent Spartan-3 Starter Kit Board and comunicates trought FIFO blocks based on the shift register principle. Graphics interface generates lines and secondary forms, circles and secondary forms, fills area up and controles 2D transformations of picture.
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Design of experiments for quality optimization
Havlásek, Radim ; Kosina, Petr (referee) ; Novotný, Radovan (advisor)
This thesis is aimed to Design of Experiments methodology. Main purpose of this thesis is to create detailed materials for lessons of Design of Experiments in Quality Control courses. Thesis contains case studies which are applicable for education purposes. Design of Experiments has been applied for solder joints quality evaluation. Solder joints have been modeled in software ANSYS and finite element method has been applied for thermomechanical stress evaluation.
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