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Electronically reconfigurable frequency filters
Gajdoš, Adam ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
The aim of the thesis was design of reconnection-less and electronically reconfigurable filters of SISO type with non-traditional active elements. Adjustability of bandwidth or quality factor is also required. First part of the thesis deals with theoretical analysis of filters, their operation modes and design of frequency filters using Signal-flow graph method aswell. Last but not least, electronical reconfiguration of transfer function and parasitic analysis was discussed. Another part describes active elements used in the practical part of thesis. Behaviors and design of active elements using existing circuits (e.g. UCC,EL2082) are described and their transformation into the Signal-flow graph form too. In the practical part five reconnection-less and reconfigurable filters of SISO type was designed using SNAP program. Simulations were done using Orcad program with ideal and real simulation models of active elements. Last part deals with filter design in EAGLE and experimental measurement.
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Frequency Filters with Controllable Current Followers
Novotný, Matouš ; Herencsár, Norbert (referee) ; Koton, Jaroslav (advisor)
Submitted work engage in suggestion and realization of frequency-selection filters with usage one or more active devices CMI (Current Mirror and Inverter). The preamble of thesis is applied to theory of frequency-selection filters and possible usage of them. The projected circuit layouts are discussed next to would be possible change some of choice parameters of frequency-selection filter. The part of thesis is numerical suggestion of found solutions, their simulation in suitable program and realization.
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Design of frequency filters with non-traditional transconductance elements
Gajdoš, Adam ; Vrba, Kamil (referee) ; Jeřábek, Jan (advisor)
The aim of Bachelor’s thesis was to study, design and practically realize controllable frequency filters, working in the current mode, using non-traditional active elements, containing a combination of transconductance amplifiers with current conveyors. Thesis deals in the theoretical part with the basic division of frequency filters, operating modes of circuits and design method of signal flow graphs, which are used for design of the circuits in the practical part. The next section describes all the active elements that are used for circuits realization. In the practical part five circuits are designed with the element VDCC and one circuit with CCTA. Simulation is performed on all circuits using a previously defined model of the real UCC. Last part of thesis describes the design of the PCB and the results of experimental measurements for chosen circuit.
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Current mirror higher-order filters
Novotný, Matouš ; Herencsár, Norbert (referee) ; Lattenberg, Ivo (advisor)
Submitted work engages in suggestion of frequency-selection filters with usage of more active elements of the MCMI (Multi-Output Current Mirror and inverter). The preamble of thesis is applied to theory of frequency-selection filters and possible usage of them. The projected circuit layouts with the active elements are discussed in terms of the impact of parasitic properties of the real models. The part of thesis is numerical suggestion of found solutions, their simulation in suitable program.
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Design of adjustable fully-differential filters with current active elements
Polášek, Lubomír ; Koton, Jaroslav (referee) ; Jeřábek, Jan (advisor)
The master thesis deals with design of the fully differential frequency filters working in the current mode and is focused on possibilities of the natural frequency and the quality factor adjustment. At the beginning, there is a brief description of frequency filters and active elements (MO-CF, FD-CF and DACA), which are used in the thesis. Furthermore, simplified signal flow graphs design method and transformation of passive and active elements to the differential structures are described. The designs of four differential circuitries which provide possibility of tuning the natural frequency or quality factor by the gain of the DACA element are shown in the thesis. Simulation results made in OrCAD program with help of third-order models are included. The practical implementation of the differential frequency filter for tuning of the natural frequency by the DACA elements is shown in the last chapter.
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Active RC filters using CMOS technology
Veverka, David ; Kledrowetz, Vilém (referee) ; Háze, Jiří (advisor)
This work deals with issues of active RC filters and their application using CMOS technology. The work focuses on basic sumarization of fundamental knowledge about function of active RC filters but it also describes basic characteristics and parameters. The defined parameters are utilized in bachelors thesis. A research has been made about the current state in discussed topic and from this research there were derived parameters for simulations that are shown in the practical part of this work.
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Aperture Corrector for Video Signals
Klozar, Lukáš ; Slanina, Martin (referee) ; Říčný, Václav (advisor)
Aim of this bachelor thesis is detail description and design aperture correction of video signals. Following theory of possibilities of aperture correction, realize corrector and verify it‘s function. Input signal of aperture corrector is luminance signal of video signal. It’s function is to reduce duration of signal edges. Attention si mainly give to derivative way of correction. Text describes theory of apperture correctnion of video signals and way of corrections. Derivative aperture corrector is detaily described, designed and simulated on PC, including constructional features. The last part is aimed at construction and comparing of measured and simulated processes .
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Design of frequency filters with non-traditional transconductance elements
Gajdoš, Adam ; Vrba, Kamil (referee) ; Jeřábek, Jan (advisor)
The aim of Bachelor’s thesis was to study, design and practically realize controllable frequency filters, working in the current mode, using non-traditional active elements, containing a combination of transconductance amplifiers with current conveyors. Thesis deals in the theoretical part with the basic division of frequency filters, operating modes of circuits and design method of signal flow graphs, which are used for design of the circuits in the practical part. The next section describes all the active elements that are used for circuits realization. In the practical part five circuits are designed with the element VDCC and one circuit with CCTA. Simulation is performed on all circuits using a previously defined model of the real UCC. Last part of thesis describes the design of the PCB and the results of experimental measurements for chosen circuit.
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Active RC filters using CMOS technology
Veverka, David ; Kledrowetz, Vilém (referee) ; Háze, Jiří (advisor)
This work deals with issues of active RC filters and their application using CMOS technology. The work focuses on basic sumarization of fundamental knowledge about function of active RC filters but it also describes basic characteristics and parameters. The defined parameters are utilized in bachelors thesis. A research has been made about the current state in discussed topic and from this research there were derived parameters for simulations that are shown in the practical part of this work.
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Electronically reconfigurable frequency filters
Gajdoš, Adam ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
The aim of the thesis was design of reconnection-less and electronically reconfigurable filters of SISO type with non-traditional active elements. Adjustability of bandwidth or quality factor is also required. First part of the thesis deals with theoretical analysis of filters, their operation modes and design of frequency filters using Signal-flow graph method aswell. Last but not least, electronical reconfiguration of transfer function and parasitic analysis was discussed. Another part describes active elements used in the practical part of thesis. Behaviors and design of active elements using existing circuits (e.g. UCC,EL2082) are described and their transformation into the Signal-flow graph form too. In the practical part five reconnection-less and reconfigurable filters of SISO type was designed using SNAP program. Simulations were done using Orcad program with ideal and real simulation models of active elements. Last part deals with filter design in EAGLE and experimental measurement.
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