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Digitally controlled electronic load
Kopka, Martin ; Boušek, Jaroslav (referee) ; Hejátková, Edita (advisor)
This thesis addresses the topic of electronic loads. The aim of the thesis is to design and construct a digitally controlled electronic load, allowing the user to operate the load through a user interface of the control panel. The theoretical introduction describes the principle of operation of electronic loads and their possible applications. Their basic circuit elements and their influence on circuit parameters are described. Special emphasis is placed on explaining the principle of operation of MOSFET transistors and effects of their long-term operation in saturation region. The thesis also covers the topic of error amplifiers and system stability analysis to ensure fast transient response. An integral part of the thesis is the actual design of the electronic load module and its control panel, including a description of the software elements ensuring safe and reliable device operation. The design is implemented, and its parameters are verified.
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Low-frequency electronically adjustable active load
Vaněk, Petr ; Theumer, Radek (referee) ; Šotner, Roman (advisor)
SBachelor thesis deals with the design of an active electronic load for DC and AC input signals. The PSpice simulations are used for verification of mentioned modes of the electronic load operation and the principles of their functions. The main content of this work is the design of low frequency active electronic load, design of control performance and verification by it‘s simulation, preparation of production documents, completion of prototype and experimental verification.
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Analysis and design of decoupling capacitors in the 65 nm CMOS digital standard library
Kučera, Radek ; Bartoš, Pavel (referee) ; Král, Vojtěch (advisor)
Tato práce se zabývá návrhem blokovacích kondenzátorů ve formě CMOS tranzistorů pro stabilizaci napájecího napětí v digitální standardní knihovně se zaměřením na 65 nm technologii. Úvod poskytuje přehled CMOS technologie a popis MOS struktur. Analýza porovnává čtyři topologie blokovacích kondenzátorů (NMOS, PMOS, CMOS, Cross-Coupled) a identifikuje Cross-Coupled jako nejlepší volbu. Poslední část se zaměřuje na návrh a optimalizaci layoutu blokovacích kondenzátorů. Byly vytvořeny čtyři různé layouty, optimalizované pro kapacitu, činitel jakosti, svodový proud a kompromis mezi těmito faktory, aby mohly být integrovány do standardních digitálních knihoven podle specifických aplikací.
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In-situ characterization of semiconductors using scanning probe microscopy techniques
Očkovič, Adam ; Pléha, David (referee) ; Pavera, Michal (advisor)
The thesis focuses on the analysis of semiconductor components using scanning probe microscopy. In the first part, crystalline substances are classified according to their electrical properties. Then, the theory of intrinsic and extrinsic semiconductors, PN transitions and finally the basic types and functions of transistors are introduced. In the second section, SPM techniques and their principles of operation are presented, which are suitable for failure analysis of semiconductor devices. The third chapter introduces the measurement setup, which consists of a scanning electron microscope MIRA and a scanning probe microscope LiteScope, which uses self-sensing probes. In the fourth chapter, the semiconductor samples analyzed were tungsten plugs in a cross-section of CMOS chip, a cross-section of bipolar transistor, and a lamella of unipolar MOSFET transistor. Analysis of these samples was performed using AFM, CAFM, EFM, KPFM and SSRM techniques in the last chapter. For each technique and sample, an analysis of the measured data was performed. Together with the techniques, the basic limitations and interesting outputs for failure analysis were presented.
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Mains charger with variable output voltage.
Dittrich, Marek ; Šteffan, Pavel (referee) ; Boušek, Jaroslav (advisor)
Nowadays every portable electronic device, tool or machine is powered by some type of accumulator. It is not possible to standardize types because the use of batteries is influenced by the power output, capacity, weight or price. They also differ in charging voltage, depending on their chemical composition. For this reason, it is often necessary for each type to have its own charger. In this case, an attempt has been made to simplify charging and reduce charger procurement expenses by designing a charger with adjustable voltage from 2.6 V to 20 V. This range can cover the charging of most types of accumulators available on the market.
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Bulk-driven current mirrors
Kováčik, Martin ; Prokop, Roman (referee) ; Khateb, Fabian (advisor)
My bachelor’s thesis is about bulk-driven CMOS principle for several analog circuit projects. A substrate gate is used for signal input to achieve low supply voltage and low wattage while keeping parameters adequate to current structures. The goal of my work was to design current mirror with low supply voltage and low wattage with usage of this principle. In my work there are basic data about bulk-driven technology and MOFSET transistors used in this technology. My project contains different kinds of schemes of bulk-driven current mirrors which are compared with conventional gate-driven current mirror. These circuits are simulated in Orcard Pspise program.
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Inverter for arc welding
Matiaško, Maroš ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This bachelor’s thesis describes designing, paremeter rating and construction of welding source on the principle of high-frequency inverter. The main scope of work is to design a switching inverter for arc welding on the principle of the forward converter. Welding source is regulated for demand of constant current.
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Drivers for power SiC MOSFET transistors
Vitek, Vojtech ; Vorel, Pavel (referee) ; Procházka, Petr (advisor)
The bachelor thesis describes gate driving principles of power MOSFET transistors made of silicon carbide material. The autor's aim is describing a different types of gate drivers and basic rules during process of designing gate drivers. In the theoretical part, the author will mount printed circuit board of gate driver designed on UVEE FEKT VUT Brno and verify functionality.
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