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Implementation of frequency and amplitude modulation to the FPGA circuit
Veškrna, Filip ; Prokop, Roman (referee) ; Fujcik, Lukáš (advisor)
This bachelor´s thesis deals with design of amplitude modulator in FPGA circuit. Theoretical part describes principles of amplitude, frequency and Sigma-Delta modulation and summarizes standards for radio broadcasting in the Czech republic. Practical part is focused on design of Sigma-Delta A/D converter using simple passive circuit components including design of input digital filters CIC and FIR with program MATLAB. There is also designed lookup table for function sinus, blocks for modify samples and signal multiplication and D/A Sigma-Delta converter on the output. The entire circuit is described in VHDL language.
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Design of the Rail-to-Rail operational amplifier in CMOS
Cvešper, Stanislav ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This thesis deals with design of rail-to-rail class AB operational amplifier in CMOS technology I3T25. Starting with a short introduction to CMOS transistors, following with description of operational amplifier, structures of operational amplifier, its design and simulation in software Cadence, with added description of techniques for minimalizing input offset voltage. Main goal is to design a rail-to-rail input common mode range operational amplifier with minimal input offset voltage with layout included.
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Design of the Rail-to-Rail current conveyor in CMOS technology
Hudzik, Martin ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
Master’s thesis deals with design of rail-to-rail second generation current conveyor in CMOS technology. Describes principles of function of different generations of current conveyors, as well as the basic principle of design of second generation current conveyor based on operational amplifier. Addresses circuit topology of input rail-to-rail stage and class AB output stage. The objective of this thesis is to design, characterize performance and create layout of second generation current conveyor with input common mode voltage rail-to-rail capability in ONSemi I3T25 technology.
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Electronic Lamb Ballast for HCFL
Uherek, Jaromír ; Prokop, Roman (referee) ; Semiconductor, Roman Štuler, ON (advisor)
The Bachelor´s Thesis goal is the realization of lamp ballast for a hot cathode fluorescent lamp (HCFL). These lamps are now widely produced in the performance of units to tens of watts. They are also used in the manufacture of energy saving lamps which are used for direct replacement of incandescent light bulbs. The lamp ballasts are produced as a separate unit for existing lights too. Main advantage of lamp ballast is higher efficiency and realization other functions i.e. dimming.
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Robust Control of AC Electrical Drives
Pohl, Lukáš ; Prokop, Roman (referee) ; Brandštetter, Pavel (referee) ; Blaha, Petr (advisor)
The purpose of this disertation is to introduce and demonstrate a new approach to robust control of AC electrical drives. The proposed robust control method takes advantage of a nonlinear nature of AC motor d-q equations to construct self-scheduled LPV stator current controller. The benefit of this approach is in maitaining the robustness without any increase in conservatism of the H infinity controller. The resulting controller achieves fast and consistent response in the entire range of operating speeds. Rejection of the load torque disturbance is achieved with nonparametric H infinity speed controller in the outter loop of the cascade structure. The combination of LPV current controller and H infinity speed controller was verified on real-time simulation platform dSPACE ds1103. Simulation results for both types of AC motors (PMSM and IM) shows that the proposed solution is not only robust with respect to operating speeds but also impervious to wide range of load disturbance values.
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Permanent Magnet Synchronous Machine Sensorless Control Algorithms
Veselý, Libor ; Prokop, Roman (referee) ; Melichar,, Jiří (referee) ; Václavek, Pavel (advisor)
Algorithms of sensorless control of surface permanent magnet synchronous motors are discussed in the dissertation thesis. A method for position and speed estimation in high-speed region based on model reference adaptive system is described. Furthermore, classical approach using Kalman filtering was verified. Kalman filter expected the rotor speed to be constant as a modification of model using variable speed approach. These algorithms are not able to work at low speed region, thus a new method was proposed. This method is designed on extended Kalman filtering and uses the model which describes the stator inductance changes in - coordinates. At motor start, knowledge of initial rotor setup is required. The algorithm for initial rotor angle using high frequencies injected into the motor was proposed.
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Modular approach to desing of modern analog devices in CMOS technology
Prokop, Roman ; Ďuračková, Daniela (referee) ; Hudec, Lubomír (referee) ; Musil, Vladislav (advisor)
The presented dissertation thesis deals with modular design of analog circuits in CMOS technology. The goal of the work is to design a set of modular microelectronic building blocks and realize the selected modern active circuits, working primarily in current mode. Nevertheless, the modular approach can be used for design of generally known classical elements, e.g. opamps, as well. As a part of the work, the development of the totally new highly versatile active circuit CCTA has been done, including detailed analysis of utilization and introduction of the most interesting applications. This circuit CCTA, together with relative, already theoretically treated circuit CDTA, has been realized here for the first time, in two different topologies. Final circuits were tested. On the basis of measurement results the library of behavioral models for PSpice was created, including exemplary simulations of the selected applications. Based on the obtained knowledge the brief comparison of voltage mode circuits and current mode circuits was done.
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Bulk-driven current mirrors
Kováčik, Martin ; Prokop, Roman (referee) ; Khateb, Fabian (advisor)
My bachelor’s thesis is about bulk-driven CMOS principle for several analog circuit projects. A substrate gate is used for signal input to achieve low supply voltage and low wattage while keeping parameters adequate to current structures. The goal of my work was to design current mirror with low supply voltage and low wattage with usage of this principle. In my work there are basic data about bulk-driven technology and MOFSET transistors used in this technology. My project contains different kinds of schemes of bulk-driven current mirrors which are compared with conventional gate-driven current mirror. These circuits are simulated in Orcard Pspise program.
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