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PC Controlled PLL Synthesizer
Málek, Miroslav ; Šrámek, Petr (referee) ; Vágner, Petr (advisor)
The aim of this bachelor´s thesis is a practical realization of computer controlled PLL synthesizer using USB serial port. FT232RL was used as an interface between the PLL synthesizer ADF4110 and PC. A software with graphical user interface was also developed in order to control registers of the syntesizer.
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Software defined transceiver for radio amateur use
Paus, Anton ; Povalač, Karel (referee) ; Žalud, Václav (referee) ; Šrámek, Petr (advisor)
This project deals with possibilities of using the software defined radio conception for radio amateur use in a short wave band and its subsequent implementation into properly designed hardware. The aim of this work is to design a transceiver that would be capable of working in AM, FM, SSB, and CW modes. Within a theoretical part of the project the architectures of software defined radios and their components are discussed. This part was focused mainly on analog parts of the chain, such as amplifiers, filters and converters. Signal processing algorithms for both receiver and transmitter working in desired modes are studied subsequently and their computer models are built. Designed algorithms are implemented into FPGA structure (Virtex -5).
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Tuning of antennas rotator by microprocessor Atmel
Zatloukal, Petr ; Šrámek, Petr (referee) ; Lukeš, Zbyněk (advisor)
The bachelor thesis deals with design and realization of a tool for controlling and diagnosing of the state of commercially available antenna rotators, which serve for angling of narrow directional antennas to the required direction of receiving and transmitting. Antenna rotators controlled by microcontroller are able to communicate with personal computers, which might be used for appropriate measuring automatisation and are today used for collecting data about realized radio amateur connections through software logs.
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Implementation of software radio into FPGA
Šrámek, Petr ; Maršálek, Roman (referee) ; Prokeš, Aleš (advisor)
The common objective of this project is implementation of software defined radio (SDR) into FPGA. The text contains review and comparison of several hardware concepts intended for SDRs implementation then the methods for digital implementation of various components of radios as the filters, mixers and others are mentioned. Part of the text introduces used hardware platform and describes software support for designing, simulations and implementation into hardware. Significant part of project describes complex of external hardware components as filter, amplifier and control panel designed and built within the project realization. But the main part of project demonstrates design of the software solution of radio receiver. There is specified architecture of radio for FM broadcast receiving, next the more complex systems with carrier recovery algorithm are presented. These systems are able to work with AM, BPSK and QPSK modulations. It is possible to implement all these receivers into hardware and verify their operation. The practical laboratory theme has been outlined within the project run.
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HF band power amplifier
Korvas, Miroslav ; Zamazal, Michal (referee) ; Šrámek, Petr (advisor)
The theme of my diploma thesis is a realization of the high frequency amplifier with possibility to change its class between class A, B and C with output low pass and band pass filters. The output power is supposed to be at about 10 W in frequency range 3,5 MHz to 14 MHz. The thesis contains theory of amplifier respectively transceiver and filters. In next parts I will design, simulate, realize and measure created amplifier and filters.
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Ultra low noise switching power supply
Raba, Jaroslav ; Leuchter,, Jan (referee) ; Šrámek, Petr (advisor)
This thesis deals with the issue of switching power supply in terms of noise ratios in the output voltage. In the theoretical part analyzes the basic principle of classical and resonant topology switching power converters in terms of output voltage ripple and switching noise. There are also some possibilities of compensation to minimize switching noise and output ripple. The second part describes the custom design a low noise switching power supply, which is composed of an active power factor corrector, power converters and ripple limiter. The main power converter is designed as an LLC resonant converter. The last part deals with the actual construction of the proposed source, its measurement and presentation of the results.
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Front end for software receiver
Slezák, Jakub ; Horský, Pavel (referee) ; Šrámek, Petr (advisor)
This thesis deals with a theoretical analysis of the basic parameters of receivers, input circuit architecture and signal digitization. According to the specified assignment it is outlined block scheme of front end for software receiver with specified components and the total bilance is calculated. Individual parts of the system are designed and realized. This is a set of four input filters for bandwidths: short waves up to 30 MHz, 87,5-108 MHz, 144-148 MHz and 174-230 MHz. The main point of design is a circuit containing a low-noise amplifiers, switches, and two amplifiers with adjustable amplification. Mainly are used integrated circuits from Analog Devices corporation. To control the various switches and adjustable amplifiers was designed a separate panel, which is connected to the main circuit via a cable. In the last phase was the whole system and its components subjected to measurements. Thanks to a number of mounted SMA connectors it is possible to measure different parts of the system and we are able to modify it partially.
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Tunable loop antenna for ham radio
Šmerda, Jaroslav ; Šrámek, Petr (referee) ; Lukeš, Zbyněk (advisor)
This bachelor thesis is focused on the design and construction of loop antenna that can tune the stepper motor using capacitors. The antenna is designed for short waves used by radio amateurs. My task is to establish an antenna tuning using 4-position stepper motor controlled by a microprocessor, which will set the stepper motor to the positions that will change the capacity of capacitors needed to tune the antenna for the frequency band.
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Simple speech recognition algorithm for microcontroller
Vedra, Lukáš ; Šrámek, Petr (referee) ; Fedra, Zbyněk (advisor)
The bachelor thesis deals with speech recognition commands on the microcontroller Atmel AVR family. The thesis describes methods of recognition, influence of a sampling frequency selection, lengths of a sequence used, and a number of possible orders with respect to computing speed and memory capacity of the microcontroller. Furthermore, successful acquisition of orders is tested. It also discusses comparison options of an imprint saved in a dictionary command, or more precisely in a database of the microcontroller and a word which has just been uttered. The work also deals with a mechanical system design of the device.
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Module for remote access via Ethernet
Pospíšil, Martin ; Šrámek, Petr (referee) ; Prokeš, Aleš (advisor)
This thesis is about creation of control software (firmware) for remote access unit, using ethernet for communication. It implements web interface for control and monitoring of connected device, which requires both digital and analog signals for control. Hardware is based on C8051F120 as main microcontroller and CP2200 as ethernet controller. Thesis briefly describes most important protocols used in this system and examines features of the Silicon Laboratories TCP/IP stack.
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