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Využití obvodových prvků s fraktální dynamikou v analogových posouvačích fáze
Zedka, Radim ; Šotner, Roman (oponent) ; Petržela, Jiří (vedoucí práce)
Práce se zabývá matematickým popisem, metodami návrhu a využitím fraktálních pasivních RC struktur - dvojpólů - v určité kmitočtové oblasti. Jsou zde uvedeny dvě metody pro návrh těchto struktur a jedna z nich je využita pro návrh a konstrukci tří fraktálních dvojpólů. Ty jsou podrobně změřeny a zhodnoceny. Jsou zde teoreticky rozebrány analogové posouvače fáze využívající tento fraktální prvek a následně jsou prakticky realizovány a změřeny. Závěrem se práce stručně věnuje metodě návrhu fraktálních dvojbranů pomocí obecných bikvadraturních filtrů.
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Power line channel simulator
Jedlička, Tomáš ; Fujdiak, Radek (oponent) ; Mlýnek, Petr (vedoucí práce)
The master’s thesis is focused on the analysis and modeling of power line communication with aim to implement power line channel simulator in the programming environment Matlab. At the beginning of the thesis are summarized basic information about the PLC communication, its basic distribution in terms of frequency bands and are also mentioned advantages and disadvantages. The emphasis on the meaning and importance of modeling with the aim to analyze PLC communication channel is specified further. The following is a detailed description of the current power lines communication models. Power line channel simulator was created on the basis of mathematical analysis for low-voltage (LV) distribution networks. The created simulator uses a model of cascaded two-ports and works in random or fixed mode. Input parameters are real topologies, different types of loads and cables. RLC resonant circuit as a frequency selective impedance is also included in impedance models. Based on the obtained results was performed the analysis, determined the critical parameters and extreme values. Comparison of effectiveness of created simulator was processed on the basis of available simulators from other authors. Two versions of simulator were created using the results obtained under comparison of effectiveness. For comparison was also performed real measurement on a simple topology. The experimental measurements results have been implemented in the simulator.
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Analog Phase Shifters of Fractional Order
Zedka, Radim
This paper brings some general knowledge about linear analog fractional-order phase shifters. These useful building blocks can perform continuous phase shift with adjustable userdefined asymptotic values. Design process starts with predefined transfer function in which at least single fractional-order passive two-terminal device is needed. These elements are made as approximations in limited frequency range by using fully passive ladder structures where only resistors and capacitors are employed.
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Využití obvodových prvků s fraktální dynamikou v analogových posouvačích fáze
Zedka, Radim ; Šotner, Roman (oponent) ; Petržela, Jiří (vedoucí práce)
Práce se zabývá matematickým popisem, metodami návrhu a využitím fraktálních pasivních RC struktur - dvojpólů - v určité kmitočtové oblasti. Jsou zde uvedeny dvě metody pro návrh těchto struktur a jedna z nich je využita pro návrh a konstrukci tří fraktálních dvojpólů. Ty jsou podrobně změřeny a zhodnoceny. Jsou zde teoreticky rozebrány analogové posouvače fáze využívající tento fraktální prvek a následně jsou prakticky realizovány a změřeny. Závěrem se práce stručně věnuje metodě návrhu fraktálních dvojbranů pomocí obecných bikvadraturních filtrů.
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Power line channel simulator
Jedlička, Tomáš ; Fujdiak, Radek (oponent) ; Mlýnek, Petr (vedoucí práce)
The master’s thesis is focused on the analysis and modeling of power line communication with aim to implement power line channel simulator in the programming environment Matlab. At the beginning of the thesis are summarized basic information about the PLC communication, its basic distribution in terms of frequency bands and are also mentioned advantages and disadvantages. The emphasis on the meaning and importance of modeling with the aim to analyze PLC communication channel is specified further. The following is a detailed description of the current power lines communication models. Power line channel simulator was created on the basis of mathematical analysis for low-voltage (LV) distribution networks. The created simulator uses a model of cascaded two-ports and works in random or fixed mode. Input parameters are real topologies, different types of loads and cables. RLC resonant circuit as a frequency selective impedance is also included in impedance models. Based on the obtained results was performed the analysis, determined the critical parameters and extreme values. Comparison of effectiveness of created simulator was processed on the basis of available simulators from other authors. Two versions of simulator were created using the results obtained under comparison of effectiveness. For comparison was also performed real measurement on a simple topology. The experimental measurements results have been implemented in the simulator.
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