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Generalized design of frequency filters with operational amplifiers
Dokoupil, Drahomír ; Minarčík, Martin (referee) ; Vrba, Kamil (advisor)
This thesis is about general design of frequency-selection filter with help of autonomous circuits. Operational amplifier has been chosen as active device/element. In the begining of this project is described role of frequency-selection filters in electronics circuits, their basic types and their transmission function. Another part of this thesis dissertate about construction of autonomous circuits, selection of suitable admittance network and it's simplification. Selected autonomous circuits are initial elements to find out known connections of frequency-selection filters. Last part of this thesis describing work with SNAP software, ways to find new connection of filter and describe how autonomous circuit works in voltage or current mode.
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Design of filters in current, voltage and hybrid modes with OA, using autonomous curcuits
Jašek, František ; Minarčík, Martin (referee) ; Vrba, Kamil (advisor)
This bachelor‘s thesis describes the procedure of design of frequency filters with operational amplifier using autonomous circuit. At first there is the procedure of an inference common and autonomous circuits with operational amplifier, of which they are follow on derived know and unknown engagement of frequency filters in voltage, current and hybrid mode. In all these inference frequency filters were determine a transmission function, according them is evidently about which frequency filters is discussed (low pass, high pass, band pass, band stop). The derived filter circuits are then selected two unknown involvement, which is set out in detail the procedure in the design of the frequency filter. Both suggestion circuits was verified by a simulation which results are noticed in this thesis and sequentially was made an experimental verified by mounting product in SMD. On this product was made a metering of a transmission and phase frequency characterization which was recorded in the graph. In fine there is a description of propriety of suggestion frequency filters for a practically use in this production.
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Frequency filters using voltage conveyors
Dohnal, Pavel ; Vrba, Kamil (referee) ; Minarčík, Martin (advisor)
The topic of this bachelor´s thesis was frequency filters and their realization using voltage conveyors. The main goal of my thesis was design and simulation of frequency filters with voltage conveyors through two different methods. At first there were found filters second order with voltage conveyors using autonomous circuits. These circuits resulted from total admitance net. Then the frequency filters using voltage conveyors were solve through synthetic components. At the beginnig of this project the frequency filters, their characteristics, realizations and types were defined. Then were designed basic properties of current conveyors, from which we can derive voltage conveyors. The voltage conveyors are basic building components of my thesis. There were defined individual types of voltage conveyors and their close specification. There was defined universal voltage conveyor. Through the universal voltage conveyor we can realize all types of voltage conveyors. After the definition of useful species there were designed the frequency filters second order using voltage conveyors with four passive components using the total admitance net. There were found 44 these circuits. Then one of these circuits was selected and this circuit was simulated to lowpass and hipass. Subsequently the other method was used, where were used the synthetic components to creation of filters secon order. The circuits resulted from autonomous circuits, which were produced by the first method. 25 of these autonomous circuits were usable for this method. One of these circuits was simulated to lowpass and hipass.
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Bifurcation analysis of electric drive
Mach, Martin ; Vrba, Jaromír (referee) ; Koláčný, Josef (advisor)
This master thesis is deals with phenomenon of bifurcation in DC drive. It contains theoretical part, results of simulations and measurements of real DC drive in laboratory. The simulations was made in MATLAB, their results are bifurcation diagrams for different value of parameters. Target of measurement in laboratory was observed bifurcation on the real DC drive. Results of measurement are too transformed to bifurcation diagrams.
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Analog frequency filter design using signal flow graphs
Petlák, Martin ; Vrba, Kamil (referee) ; Minarčík, Martin (advisor)
In my graduation thesis I first of all shortly mentioned frequency–selection filters and their utilisations. However, the base point of this project was to acquaint with different types of signal flow diagrams with whom I should design and analyse frequency-selection filtres with conventional and also innovative active components. As the first I created signal flow diagrams for both voltage and current conveyors. These modern active components are well known today and enable the construction of circuits with better properties than circuits with traditional differentiating amplifiers with voltage feedback. Thereinafter I made signal flow diagrams for OTA component. Transconductancal amplifiers are well known active components used in various areas of analog signal processing. OTA amplifier is in fact the current source controlled by voltage difference, which is characterised by gm transconductance. Ulterior components were IOZ and IZN models of voltage amplifier with voltage gain A. The last component was COA amplifier. It is a current operational amplifier. COA model is fully dual component to VOA, which is classical voltage amplifier. In my project I used filters with two OTA components. This filter offers functions like low-pass filter, band-pass filter, high-pass filter, band-stop filter and two-phase network. Following this I used circuits with two GCC conveyors. These offer band-pass filter, low-pass filter, high-pass filter, band-stop filter and two-phase network. Ultimately I designed filters with COA components, which offer three transmission functions simultaneously (DP, PP and HP). Analysis of these filters was made with a help of PSpice computer programme.
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ORGANISATION AND DIRECTION OF TRAFFIC IN DIFFERENT SIZES OF COMPANIES
VRBA, Martin
This diploma work was aimed at an analysis of organization and direction of transport in different sizes of companies. One ot the companies is ČSAD JIHOTRANS, jsc. and the second one is Duropack Bupak Papírna, ltd. A part of this work is also the consideration, if outsourcing, which ČSAD JIHOTRANS, jsc do for Duropack Bupak Papírna, ltd, is more advantage then transport with the own means of transport. In literature overview were descripted logistic, transport, costs of transport and their calculation, advantages and disadvantages of different kinds of transport, international contracts at the transport, electronic toll and outsourcing. In the practical part were descriped the Duropack Bupak company and transport company ČSAD JIHOTRANS, jsc, their history, basic charakteristic of activities and their organization structures. Further was performed an analysis of extend of transport, which ČSAD JIHOTRANS, jsc performed for Duropack Bupak, ltd in 2006. It was also performed the analysis of costs of transport, if Duropack Bupak, ltd perform the transport with the own means.
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Classical and modern methods of money laundering
Vrba, Tomáš ; Marek, Petr (advisor) ; Makovec, Martin (referee)
Money laundering is the process where money from illegal activities are transformed into legal money. Those washed money help people who are engaged in illegal activities. And this is why money laundering is considered a crime. In my thesis I try to explain the concept of money laundering, how this process goes on and its most considerable parts. I also try to mention indicators that could be linked to money laundering. Of course, this work also puts stress on control, measures against money laundering (particularly in the Czech Republic) and gives us a brief description of some offices, which are also engaged in the problem. This work contains other possible methods, which could in my view be used in the process of money laundering. However, considering the broadness of the topic of money laundering at present and the continuous development of new techniques every day, this work represents just an outline of the basic issues.
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