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Audio amplifier with PWM modulation for laboratory measurements
Holub, Josef ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This paper deals with the theoretical analysis of the essential parts of amplifier operating in Class D. It describes the principles and the relationship between the individual blocks. The second part deals with the design of the block connection of a switched amplifier for a laboratory device. The design part contains calculations, justification of the selection of individual components and integrated circuits and schematic connection within the individual blocks. Some blocks are simulated using PSpice and FilterFree. The work also deals with the structural design of the jig and the creation of a 3D model. The annex is contained overall diagram of an amplifier and a complete reference material for production.
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Noise Analysis of Basic Circuits for Analog Signal Processing
Humpolíková, Michaela ; Sládok, Ondřej (referee) ; Kubánek, David (advisor)
The cause of noise in analog circuits is a problem of quality in output signals. There are many reasons of its occurrence, noise is caused by components connected into the circuit, and the assembly itself. This bachelor thesis summarizes the theoretical knowledge about noise analysis. Noise measurement in circuits can now be calculated with PSpice, the results are used for the design of low noise circuits. In the contained practical analysis of the circuits were achieved the results for the suitable designing of low noise circuits.
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Mini-whip antenna
Pařízek, Tomáš ; Lukeš, Zbyněk (referee) ; Raida, Zbyněk (advisor)
The thesis deals with the impedance matching of electrically very short antennas to the real resistance 50 . The antenna is considered as an input of an emitter follower, which plays the role of the impedance transformer. This follower transforms a large complex input impedance, which is typical for electrically short antennas, to a real output resistance. The output impedance was matched by appropriate matching circuitry to 50 in the frequency band of operation.
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Memristor with PWL-type characteristic
Holas, Jiří ; Hájek, Karel (referee) ; Biolek, Dalibor (advisor)
Bachelor’s thesis deals with an analog emulation of memristor memory with PWL-type characteristic which is designed for modern digital memories. The first part of the document summarizes the basic memristor characteristics and rules of their proper modeling. The next parts present the circuit implementation and computer simulation. The printed circuit board design and prototype measurement are included.
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Electromagnetic actuator of simple objects
Kolek, Andrej ; Dufek, Ivo (referee) ; Hadinec, Michal (advisor)
The main objective of this work is to study the principles of the movement of very small bodies using electromagnetic forces. The first part is acquainted with the theory of electromagnetism and the second part will focus on the already functioning device, called coil gun. In the end, I will make several practical measurments, results will be compared against theoretical assumption and take measure it.
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Magnetic field calculating of transformer by using conducting model
Bláha, Martin ; Skalka, Miroslav (referee) ; Kurfűrst, Jiří (advisor)
The paper deals with conductivE-resistive network. Use of this network is modeled transformer. The model is implemented in simulation program PSPICE and Simscape. To evaluace the results were used the values obtained using the finite element method. A simple model of the transformer has been replaced by rezistor network conductivity, which is divided into elements. According to these elements is a simplified model designed and analyzed
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PCB Layout on the OrCAD 16 Platform
Horčička, Martin ; Šimek, Václav (referee) ; Schwarz, Josef (advisor)
This bachelor's thesis concentrates on layout of printed wiring boards in OrCAD 16 environment, chiefly on specification of appropriate process methodology dutiny its proposal. A set of sample tasks that helps to explain and demonstrate the process at creation of separate phases is a part of this work. Among these phases belong electronical scheme designs,interconnection and subsequent simulation.
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PSpice library of circuit elements with selfheating
Šrut, Martin ; Petržela, Jiří (referee) ; Kolka, Zdeněk (advisor)
This bachelor´s thesis is devoted to the topic PSpice library of circuit elements with selfheating, which deals with the lack of temperature in the PSpice and design models of the resistor, diode and transistor to the treatment of this problem. The thesis describes theoretically Electrothermal analogy, creating a thermal equivalent circuit model and the theory of creation diodes and transistors. The next step is a theoretical design procedure of general circuit, theory of system libraries and netlist in PSpice and a description of ways of creating subcircuits. Their own solution the whole thesis is creating a model of a resistor, diode and transistor with self-heating. Furthermore, the results are shown simulations of the models. Transistor model is tested on the output stage audio amplifier together with a model heatsink.
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Design of switch-mode audio power amplifier
Macek, Libor ; Petržela, Jiří (referee) ; Brančík, Lubomír (advisor)
This paper is divided into four parts. The first part deals with the description and explanation of the general principles of switching concept amplifiers. The second part is occupied with design of Class-D amplifier, a description of each block and calculations. A significant part of proposal of amplifier is based on simulations from programs Pspice and Filter Free. In the third part deign of power unit is discussed. The last part is focused on the measurement results on a prototype device.
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