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Laboratory device with analog computational unit AD538
Hruboš, Zdeněk ; Slezák, Josef (referee) ; Petržela, Jiří (advisor)
An analog multiplier are circuits, that are realized multiplication of two analog signals. They can be made by suitable connection (according to function) discreet parts. Nowadays there are integrated circuits in advance function, whose internal structure is made by complex of circuits with operating ampfliers and other circuits. These circuits have a very high accuracy of arithmetic operation which is mostly better than 1%. The analog multiplier are used in situation, when we need realize multiplication, division, exponentation, square root extraction and logarithmic calculation of analog signals. In the next are used in circuits for multiplication of frequency, shifting of frequency, amplitude modulation, detection phase angel of two signals with the same frequency, etc. The AD538 is a monolithic real-time computational circuit that provides precision analog multiplication, division and exponentiation. The combination of low input and output offset voltages and excellent linearity results in accurate computation over an unusually wide input dynamic range.
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Construction of class T audio amplifier
Tejmlová, Lenka ; Slezák, Josef (referee) ; Petržela, Jiří (advisor)
The aim of my bachelor’s thesis is to collect information about amplifiers, working in the T class. Because these amplifiers are usually used as digital power processing audio amplifiers, we mostly insist on the ability of sending, the signal without distortion, to amplify the frequency broadband signal, to obtain the high efficiency of the output stages and to obtain the peak quality of the sound. My task is to gather information and facts of principle of the function of the audio amplifiers working in the T class and reasonably priced integrated circuits of this class. Furthermore I am going to focus on the design of wiring of this amplifier with the 2x20 watts output, including the correction pre-amplifier, which provides correction of the heights, basses and volume. The amplifier is realized, in the end of bachelor’s thesis, there are measured it’s characteristics, which are compared to theory.
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Complete design of three-way speakers
Jalový, Michal ; Petržela, Jiří (referee) ; Slezák, Josef (advisor)
This project describes complete design of Three-way speakers. The introduction discussed the basic theoretical knowledge to the understanding of loudspeaker system design issues with regard to the physiology of hearing, the theory of acoustics, speaker characteristics, types of enclosures and the use of switches. Furthermore, based on the formula calculated parameters of a loudspeaker cabinet and speaker points to the loudspeaker of the proposed speakers.The proposal also relies on the specific measurement properties of the selected speaker impedance. Finally all data are presented for practical implementation speakers.
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Evolutionary Synthesis of Analog Electronic Circuits Using EDA Algorithms
Slezák, Josef ; Zaplatílek,, Karel (referee) ; Kolka, Zdeněk (referee) ; Dostál,, Tomáš (advisor)
Disertační práce je zaměřena na návrh analogových elektronických obvodů pomocí algoritmů s pravěpodobnostními modely (algoritmy EDA). Prezentované metody jsou na základě požadovaných charakteristik cílových obvodů schopny navrhnout jak parametry použitých komponent tak také jejich topologii zapojení. Tři různé metody využití EDA algoritmů jsou navrženy a otestovány na příkladech skutečných problémů z oblasti analogových elektronických obvodů. První metoda je určena pro návrh pasivních analogových obvodů a využívá algoritmus UMDA pro návrh jak topologie zapojení tak také hodnot parametrů použitých komponent. Metoda je použita pro návrh admitanční sítě s požadovanou vstupní impedancí pro účely chaotického oscilátoru. Druhá metoda je také určena pro návrh pasivních analogových obvodů a využívá hybridní přístup - UMDA pro návrh topologie a metodu lokální optimalizace pro návrh parametrů komponent. Třetí metoda umožňuje návrh analogových obvodů obsahujících také tranzistory. Metoda využívá hybridní přístup - EDA algoritmus pro syntézu topologie a metoda lokální optimalizace pro určení parametrů použitých komponent. Informace o topologii je v jednotlivých jedincích populace vyjádřena pomocí grafů a hypergrafů.
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Construction of class T audio amplifier
Tejmlová, Lenka ; Slezák, Josef (referee) ; Petržela, Jiří (advisor)
The aim of my bachelor’s thesis is to collect information about amplifiers, working in the T class. Because these amplifiers are usually used as digital power processing audio amplifiers, we mostly insist on the ability of sending, the signal without distortion, to amplify the frequency broadband signal, to obtain the high efficiency of the output stages and to obtain the peak quality of the sound. My task is to gather information and facts of principle of the function of the audio amplifiers working in the T class and reasonably priced integrated circuits of this class. Furthermore I am going to focus on the design of wiring of this amplifier with the 2x20 watts output, including the correction pre-amplifier, which provides correction of the heights, basses and volume. The amplifier is realized, in the end of bachelor’s thesis, there are measured it’s characteristics, which are compared to theory.
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Functional generator
Kopecký, Petr ; Dostál, Tomáš (referee) ; Slezák, Josef (advisor)
Functional generators are equipments that provide electrical signals of variable parameters. They are classified by various criterions – by the type of produced signal or according to the type of self realization of generator. This bachelor thesis deals with the possibilities of realization generators with harmonic, triangular and rectangular signals. It focus on the project of generator in compliance with gained experience and knowledge. The practical part of the thesis is focused on realization of the generator. The function of the generator is checked during the measurements.
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Realization of the high-end audio amplifier LEACH
Korvas, Miroslav ; Dostál, Tomáš (referee) ; Slezák, Josef (advisor)
The theme of my bachelor’s thesis is a realization of the high-end audio amplifier and it’s modification for the lowest distortion. Because it was not specified, I have decided to for realization of amplifier 100 W. I use modification of LEACH amp circuit for using ThermalTrak [5] transistors. My bachelor’s thesis describes problems of distortion and particular description of separate blocks of LEACH amplifier and their function. The practical part of the bachelor’s thesis contains heat sink design, measurements and simulations of the amplifier and their confrontation to theory. Technical documentation for realization of the ThermalTrak amplifier contains printed circuit board.
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Active frequency filter using current mode
Paščinský, Jiří ; Dostál, Tomáš (referee) ; Slezák, Josef (advisor)
The aim of this work is design of frequency filter working in current mode. The introduction of the work deals with features and applications of frequency filters. Special attention is paid to the transfer function of the filter. In third chapter different operational modes of electrical circuits and their advantages and disadvantages are discussed. Attention is paid to active blocks suitable for circuits working in current mode. There is description of components AD844 and EL2082 which represent current conveyors of the second generation and are used in the designed filter. The last two chapters deal with design of component values of the frequency filter. The designed circuit was simulated in PSpice and the results were compared with measurments. Also sensitivity and tolerance analysis of the filter were performed.
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Complete design of three-way speakers
Jalový, Michal ; Petržela, Jiří (referee) ; Slezák, Josef (advisor)
This project describes complete design of Three-way speakers. The introduction discussed the basic theoretical knowledge to the understanding of loudspeaker system design issues with regard to the physiology of hearing, the theory of acoustics, speaker characteristics, types of enclosures and the use of switches. Furthermore, based on the formula calculated parameters of a loudspeaker cabinet and speaker points to the loudspeaker of the proposed speakers.The proposal also relies on the specific measurement properties of the selected speaker impedance. Finally all data are presented for practical implementation speakers.
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