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Low-frequency Amplifiers
Doležel, Tomáš ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
The bachelor thesis deals with the involvement of the audio amplifier, design printed circuit boards, implementation and verification of measuring amplifiers. The proposed amplifier has an output of 100 W at nominal load 4 at a supply voltage of ± 30 V. The bandwidth of the amplifier is 550 kHz.
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HF and IF circuits of shortwave radiostation
Šnajdr, Václav ; Vágner, Petr (referee) ; Lukeš, Zbyněk (advisor)
The study, description, design and implementation of selected blocks of multiband shortwave radio station are dealt with in the thesis. Focus is placed on the concept of multiband shortwave radio stations, with an emphasis on high frequency and intermediate frequency circuits. The first chapter is devoted to description of the transceiver block diagram which is designed as superheterodyne. The design of bandpass input filters, intermediate frequency crystal filters and output filters is described. Simulation results and the measured characteristics of the implemented functional blocks are presented. Furthermore, the amplifier circuits which maintain impedance matching of individual blocks are discussed. SSB signal generation in the transmitter part of radio station and final stage power amplification are depicted.
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Audio amplifier working in class AB with 400W output power
Kopic, Jan ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The content of the thesis is the theory related to low-frequency audio amplifiers that is summarized in a separate chapter. This section describes the division of these amplifiers according to various criteria, as well as their working classes and parameters that determine their behavior. In addition, this thesis contains a description of the principle of the function of the selected class AB amplifier, which is divided into individual functional blocks and completed by the addition of speaker protection circuit. Criteria of selection for important chosen components are mentioned in appropriate chapters and supplemented with data from components datasheets. The output results of the simulations are always commented and compared with the calculated values at the end of the relevant chapter. The attachment of the thesis contains PCB design for the device realization. The correct operation of build device has been verified and measured.
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Design and construction of audio amplifier with advanced functions
Polkorab, Jaroslav ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
This bachelor's thesis focuses on the design of a low frequency class-D amplifier with the minimum output power of 2x50 W. This amplifier will be used for personal use as a HiFi system with advanced features. The design focuses on an encoder controlled preamplifier with an IR remote control, a power amplifier and a switching mode power supply. The PSpice program was selected for the circuit simulation. The schematic designs are created in Easyeda, KiCad and PSpice.
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Audio amplifier working in class AB with 400W output power
Kopic, Jan ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The content of the thesis is the theory related to low-frequency audio amplifiers that is summarized in a separate chapter. This section describes the division of these amplifiers according to various criteria, as well as their working classes and parameters that determine their behavior. In addition, this thesis contains a description of the principle of the function of the selected class AB amplifier, which is divided into individual functional blocks and completed by the addition of speaker protection circuit. Criteria of selection for important chosen components are mentioned in appropriate chapters and supplemented with data from components datasheets. The output results of the simulations are always commented and compared with the calculated values at the end of the relevant chapter. The attachment of the thesis contains PCB design for the device realization. The correct operation of build device has been verified and measured.
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Low-frequency Power Amplifiers
Matějka, Vojtěch ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
The aim of my bachelor thesis was to design a low-frequency amplifier with some specific parameters. The thesis includes several different connections of known and used amplifiers which are somehow unique or revolutionary. Also it contains the description of classes, the distortion and the structure of amplifiers. The low-frequency amplifier was designed with emphasis on resulting parameters. A design of a printed circuit and the prototype of the board were made. Then the resultant amplifier was modified and adjusted and finally its parameters were measured.
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Power Amplifier for L Band
Galajda, Jan ; Zatloukal, Petr (referee) ; Urbanec, Tomáš (advisor)
This work is focused on design of L band power amplifier. First, the design of the amplifier is substantiated by necessary theoretical basics of RF power amplifiers. Then, after comparsion of availible RF power amplifiers concepts, the doherty power amplifier is chosen as a suitable type. Design of the amplifier is focused on the linearity and efficiency. AWR design program is used for simulation of the amplifier. Amplifier is then realized and parameters are measured. Measured results are then discussed and evaluated. This work proposes design of the linear doherty amplifier for modern communications systems.
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Solid State Power Amplifier for the L-Band
Pecen, Vojtěch ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
The goal of this diploma's thesis is to create a design of a two stages amplifier working in a band reserved for the secondary surveillance radar at the frequency of 1090 MHz. Output power of the amplifier should be 20 W and efficiency should be as high as possible. Because of this the second stage is designed in class C. Contents of this diploma's thesis include a theoretical analysis, simulations of the amplifier parameters, comparison of the Ansys Designer and AWR Microwave Office simulation programs and design of both stages of the amplifier, followed by a comparison of the measured parameters with the simulations.
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Low-frequency Amplifiers
Doležel, Tomáš ; Vorel, Pavel (referee) ; Patočka, Miroslav (advisor)
The bachelor thesis deals with the involvement of the audio amplifier, design printed circuit boards, implementation and verification of measuring amplifiers. The proposed amplifier has an output of 100 W at nominal load 4 at a supply voltage of ± 30 V. The bandwidth of the amplifier is 550 kHz.
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