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Driver of Semiconductor laser for 1Gbit/s
Melichárek, Radek ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This thesis describes a design of a driver for a specific type of laser VCSEL. Models for simulation in PSpice OrCAD have been developed for this type of laser. The qualities of the designed driver aim to be equal to the integrated drivers that are available and to remove some of their drawbacks. It consists of the following components: input LVPECL receiver/driver, differential amplifier, fixed source of a modulation current, circuit of automatic power control. Regulation of the modulation current is dealt with atypically using an aptly selected input LVPECL receiver/driver which enables to control the voltage amplitude on its output by means of voltage. The thesis also describes different types of coupling between laser and driver. The most appropriate alternative is selected taking into consideration the unconventional design of the driver. The connection of the driver is supplemented by a microcontroller which secures control of output optical power by means of a serial bus RS232.
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Control and monitoring unit for optical link station
Podzimek, David ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
The aim of Master thesis "Control and monitoring unit for optical link station" is a web server, enabling communication microcontroller with the user. The communication is based on TCP/IP model. Work an overview of the various parts of the TCP/IP model. The main part of this work is devoted to the software created. The core of unit are microcontroller C8051F120 and ethernet controller CP2200 made by Silicon Laboratories.
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Paralel Interface controlled by USB
Vondra, Marek ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
Bachelor‘s work is bent on usage busbar USB, in this case on interface inverter USB –> 14-bit parallel port, whereupon subsequently will add next device namely quadrature modulator. Busbar USB was elect thanks his universality as well as possibilities transfer data big at speeds of to the of other incorporate arrangement. Work further deal with resources for performance problems, especially so analysis selection fit type controller for USB, his setting and programmed, programmed drivers for system Windows as well as service programme in system Matlab. Bachelor‘s work tie together on diploma work Ing. Igor Majko, because choice controller was in either event same that the suggested construction inverter and foreshadowed possibility next progress in buckthorn problems.
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Programme for channel coding demonstration
Závorka, Radek ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
The main subject of this thesis is creating a programme, used for channel coding demonstration. This programme will be used for teaching purposes. The programme contains various codes from simple ones, to those which almost reach Shanon’s channel capacity theorem. Specifically these are the Hamming code, cyclic code, convolutional code and LDPC code. These functions are based on theoretical background described in this thesis and have been programed in Matlab. Practical output of this thesis is user interface, where the user is able to input information word, simulate transmission through the transmission channel and observe coding and decoding for each code. This thesis also contains a comparison between individual codes, concerning bit-error rate depending on SNR and various parameters. There is a computer lab with theoretical background, assignment and sheets for convenient accomplishment of each task.
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Shortwave power amplifier
Fiala, Roman ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This master’s thesis describes RF power amplifier design. The designed amplifier has been built. The first three chapters outline basics about radio frequency amplifiers. The basic theory needed for amplifier implementation is also described there. In the fourth chapter the power amplifier is designed. The design is based on the theoretical knowledge. Complete amplifier contains RF preamplifier, power amplifier and filters. The OrCAD PSpice, Ansoft Designer SV and EAGLE programs have been used for the design and verification of some sections of circuits. Measurement results of the built amplifier are in the fifth chapter. This thesis contains also the draft for laboratory exercise.
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Power amplifier for 2 metres radio amateur transmitter
Klapil, Filip ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This work deal with development a solution of a power amplifier for 2 metres radio amateur transmitter with a minimum output of 1 kW. Part of the solution is to use a commercial module of power amplifier. In addition, the design of the input attenuator, the switching elements in the signal path, the output filter and the protection circuits including cooling. The bachelor thesis contains a proposal of a system solution with a discussion of required performance and legislative requirements. This is followed by a hardware section, where the work is devoted to the design of the hardware, the theoretical calculation of the components and the simulation. In the last part of the work deals with practical implementation, verification of function and measurement of achieved parameters and their evaluation.
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Shortwave power amplifier
Kufa, Jan ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
The aim of the master´s thesis is to create a high-frequency amplifier with switching power amplifier classes among classes A, B, C with output power of 10 W. The amplifier operates at frequency from 3.5 MHz to 14 MHz. Master´s thesis includes also theoretical analysis, design of lowpass filter and amplifiers and their simulation, mechanical realization and measured parameters of the amplifier.
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Shortwave power amplifier
Zamazal, Bořivoj ; Vařacha, František (referee) ; Prokeš, Aleš (advisor)
This master‘s thesis describes RF power amplifier design. In the first section of the work, the possible solutions and a reflection on the possible solution are presented. In the second section, the principle and thesi for power amplifier design is described. In the third section, the power amplifier design, based on the theoretical knowledge, is described and in fourth section the finaly construction solution and real parameters are described. The last part sumarized the results of this thesis.
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Simulation of the MIMO systems
Kančo, Vít ; Vařacha, František (referee) ; Prokopec, Jan (advisor)
MIMO systems are mainly used in application for wireless communication. Their principle is to use a large number of antennas for transmition and the reception of a signal. The core of these systems is to use space-time coding and either block or trellis space-time code. In the future, it is assumed enormous enlargement MIMO systems in many applications
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