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Control Unit for VHF Radio Receiver with Frequency Synthesizer
Sobotka, Martin ; Šebesta, Jiří (referee) ; Vyskočil, Pavel (advisor)
The aim of this work is to propose the involvement of the control unit for receiving VHF radio and its practical implementation. Adding a panel on the appropriate tuner unit leads to a complete receiver to receive radio broadcasts. My work is to focus on two frequency bands: VHF band for broadcasting and VHF band for air radio communication. This paper describes a process of selection of component, their description and integration into a complete circuit, a description of the control program for the microcontroller and a description of control device. Scheme and the draft for the manufacture of printed circuit board is attached.
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Laser with Narrow Spectral Linewidth for Metrology of Length
Pham, Minh Tuan ; Smrž, Martin (referee) ; Peterka,, Pavel (referee) ; Číp, Ondřej (advisor)
Práce se zabývá stabilizací diodového laseru pracujícího na vlnové délce 729 nm, který slouží pro přesnou spektroskopii a interakci se zachycenými a chlazenými ionty vápníku. Interakce s iontem vyžaduje, aby excitační laser měl extrémně úzkou šířku spektrální čáry. V práci jsou vysvětleny důležité postupy a metody vedoucí k dosažení provozu laseru se spektrální šířkou čáry v řádu Hz či nižší. Součástí práce je sestavení optické sestavy pro tento laser a k ní potřebných elektro-optických prvků. Hlavní důraz je kladen na techniky stabilizace laserové frekvence pomocí externích referencí, jejich teoretický popis a implementace je rovněž součástí této práce. Jako první přístup o zúžení spektrální čáry je zvolena metoda uzamknutí optické frekvence laseru na vybranou komponentu hřebene optických frekvencí pomocí elektronických fázových závěsů. Měření spektrálního šumu bylo provedeno pomocí dvousvazkového interferometru s nevyváženými rameny. Dosažené výsledky potlačení šumu u takto uzamčeného laseru byly poté porovnány s režimem laseru volně běžícího. Dalším postupem je uzamčení spektrální čáry laseru na velmi úzkou čáru vysoce jakostního optického rezonátoru. Touto metodou jsem dosáhl laseru s velmi úzkou spektrální čáru (v řádech desítek Hz), avšak s krátkodobou stabilitou. Finálním krokem bylo pak sestavení a použití techniky "trasfer oscillator", která zajistila dodatečnou kompenzaci nežádoucího driftu rezonančního modu optického rezonátoru a tímž zajistila dlouhodobou stabilitou celého systému. Takto stabilizovaný laser na 729 nm byl testován ve spektroskopii na zakázaném přechodu opplerovsky zchlazeného iontu vápníku.
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Wideband 6GHz RF Signal Generator
Mička, Josef ; Kubíček, Michal (referee) ; Urbanec, Tomáš (advisor)
The goal of this thesis is a design of a wideband high frequency generator with an adjustable output amplitude. The generator is based on a frequency synthesizer ADF4355. The power level of an output signal is adjustable by an attenuator HMC1119. The created generator is accesisible trough an user-friendly control panel or by SCPI commands. Frequency synthesis can run in an integer mode or a fractional mode. The output signal has a very low phase noise when it is running in the integer mode.
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Frequency synthesizer for microwave communication systems
Klapil, Filip ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
The main aim of the thesis is to develop a solution of a frequency synthesizer for a microwave communication systems. Specifically, it suggests a design for frequency synthesizer with phase-locked loop. At beginning of the thesis the principle and basic properties of this method of signal generation are explained. Then it is followed by a brief discussion of the parameters of synthesizers and their influence on design. Another part of the work is the analysis of circuit the frequency synthesizer with the phase-locked loop MAX2871, which is followed by a proposal for the design of the frequency synthesizer module hardware. 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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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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Laboratory High-Frequency Generator
Konzal, Jan ; Záplata, Filip (referee) ; Šebesta, Jiří (advisor)
This thesis describes a proposal of laboratory high frequency generator based on the principle of indirect analogue synthesis with a phase sling. The first part of the work describes the principle of a direct numerical and indirect analogue synthesis. Frequency range of the designed generator is up to 900 MHz. The output of the generator is designed to be up to 12dBm. Output impedance is 50 . To reach a frequency of oscillation lower than 800 MHz, the principle of fusion is used. Further, the control was suggested to be carried out by a microprocessor. Operating is realized using a keyboard and a rotary encoder.
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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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Design and Simulation of Single Phase Active Rectifier
Bareš, Jiří ; Huták, Petr (referee) ; Klíma, Bohumil (advisor)
This thesis deals with single-phase active rectifier, strategy of control and simulation of its model. In the beginning of this work a principle of rectifier is described along with transistor switching system, which has impact on shape of input current. Dimensioning of rectifier for assembling model and designing of control, including phase-locked loop and regulators follows. In the end assembled model and its simulation is described.
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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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Concept of three-phase active rectifier
Bareš, Jiří ; Pazdera, Ivo (referee) ; Huták, Petr (advisor)
This work deals with three-phase active rectifier control. In first, theoretical part it describes several control strategies with focus on voltage oriented control. For this type of control a design is worked out, and created model and its simulation is described. Second, practical part deals with realisation on microcontroller TMS320F28335, which is main processing unit of device lent by company Elcom. Therefore in this part abilities and settings of the controller along with developped control algorithm are described. Reached results of measurement are then presented and in the conclusion they are evaluated.
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