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Frequency-to-Voltage Converter
Šindelář, Michal ; Bejček, Ludvík (referee) ; Beneš, Petr (advisor)
This bachelor’s thesis deals with the issue of the transfer frequency to voltage focusing on dynamics and accuracy. The goal of this thesis is the design and implementation of the converter based on the input arguments. The graph evaluates the tradeoff between dynamics and accuracy. It is possible to choose a more suitable solution to transfer frequency to voltage for the specified requirements.
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Gas flow measurement
Kozák, Matěj ; Uher, Miroslav (referee) ; Beneš, Petr (advisor)
This thesis deals with the problem of designing vortex flow meter for a nominal range of 40 l.min-1. It describes the problems of vortex bodies and choice of methods for detection of vortices. The thesis includes solution of various problems in the design, which were published in scientific articles or patents. The following describes the design solution vortex flow meter for the specified range, which uses ultrasonic sensors to vortices detection. The proposed flow meter is calibrated with reference flow meter and compared with commercially produced vortex flow by the TST electronics and Burkert companies, which are designed for the specified ranges.
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Synchronized sources of clock signals
Florián, Antonín ; Lazar,, Josef (referee) ; Drexler, Petr (advisor)
This thesis deals with design of synchronized sources of time signal. The first part of the thesis deals with the theory the crystal resonators, crystal oscillators and PLL. The second part of the thesis deals with the crystal oscillator with 10MHz frequency. In the oscillator is use of SC cut crystal. The third part of the work deals with method of synchronization. To synchronization is use of PLL.
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Design of the voltage controlled oscillator
Richter, Vladimír ; Pavlík, Michal (referee) ; Háze, Jiří (advisor)
This bachelor thesis deals with the issues of voltage controlled oscillators. It analyses their current state and provides the examples of them. It also describes phase locked loop stages and the usage of voltage controlled oscillators in phase locked loops. The main aim of this thesis is to design a voltage controlled oscillator and use it to realize the important simulations.
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Digital audio interface converter with an external PLL
Klubus, Jan ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
The design of the learning hardware for the laboratory role of the BSHE, which will serve as a test sample, and will permit students to display signals in individual parts of the circuit using an oscilloscope. This device convert the S / PDIF and AES3 signal, it have a line and headphone output and the phase lock loop will be output separately for signal tracking.
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Phase Lock Amplifier
Fábik, Peter ; Havlíková, Marie (referee) ; Čejka, Miloslav (advisor)
The aim of the master thesis is on lock-in amplifiers. Amplifier's basic parts and lock-in circuits description is listed in introductory chapters. The thesis offers overview of parameters of chosen devices available on the market and their possible usage. We describe HF2LI device functions and usage of ziControl software. With the aim to verify properties of the device and ziControl software, one of the last chapters focuses on manipulation with HF2LI device. The conducted experiments and achieved results are presented in the last chapter.
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Power source for pulse magnetron sputtering
Schulz, Jakub ; Magát, Martin (referee) ; Šteffan, Pavel (advisor)
The presented thesis deals with the design and assembly of the generator for pulse magnetron sputtering. The designed device is capable of generating two square wave signals via its counter-working outputs. Both signals have independently adjustable frequency, pulse count and duty ratio. Both signals originate from two frequency syntheses controlled by microcontroller PIC16F877A. All the settings are entered by four buttons and are shown on an alphanumeric display with 16x4 characters. The duty ratio is adjusted using a special module.
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Antenna Mesurement System for Small Satellites
Dovičák, Ivo ; Pospíšil, Martin (referee) ; Urbanec, Tomáš (advisor)
Goal of this thesis was design and realization of a measurement system for measurement of reflection coefficient magnitude for connected antennas in 27-2500 MHz range. Measurement using resistive bridge is chosen as a suitable measurement method. System consists of electronic device controlled by STM32WB microcontroller unit and software for controller PC written in Python programming language using PyQt library. Communication between the device and controller PC is realized using Bluetooth interface. Circuitry for signal generation is based on Phase Locked Loop MAX2870. Device is powered from standard 18650 battery. Dimensions of the designed printed circuit board are suitable for use in CubeSat satellites. System can be used as a frequency synthesizer as well.
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