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Design of RC sinusoidal oscillator based on active building blocks
Režňák, Patrik ; Šotner, Roman (oponent) ; Kartci, Aslihan (vedoucí práce)
Thesis is focused on RC oscillators employing active building blocks and operational amplifiers. In the beginning, review of available literature talking about this topic is done. Different building blocks and circuits containing those blocks are picked and some of them simulated with PSpice and SNAP programs. Oscillation creation and influence of circuit components is verified. Those circuits are realized in practical application and simulation results are compared to those gained from real world circuits, also the chosen circuits are compared between each other.
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Analog Implementation of Fractional-Order Elements and Their Applications
Kartci, Aslihan ; Štork, Milan (oponent) ; Machado,, José Tenreiro (oponent) ; Brančík, Lubomír (vedoucí práce)
With advancements in the theory of fractional calculus and also with widespread engineering application of fractional-order systems, analog implementation of fractional-order integrators and differentiators have received considerable attention. This is due to the fact that this powerful mathematical tool allows us to describe and model a real-world phenomenon more accurately than via classical “integer” methods. Moreover, their additional degree of freedom allows researchers to design accurate and more robust systems that would be impractical or impossible to implement with conventional capacitors. Throughout this thesis, a wide range of problems associated with analog circuit design of fractional-order systems are covered: passive component optimization of resistive-capacitive and resistive-inductive type fractional-order elements, realization of active fractional-order capacitors (FOCs), analog implementation of fractional-order integrators, robust fractional-order proportional-integral control design, investigation of different materials for FOC fabrication having ultra-wide frequency band, low phase error, possible low- and high-frequency realization of fractional-order oscillators in analog domain, mathematical and experimental study of solid-state FOCs in series-, parallel- and interconnected circuit networks. Consequently, the proposed approaches in this thesis are important considerations in beyond the future studies of fractional dynamic systems.
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Analog Implementation of Fractional-Order Elements and Their Applications
Kartci, Aslihan ; Štork, Milan (oponent) ; Machado,, José Tenreiro (oponent) ; Brančík, Lubomír (vedoucí práce)
With advancements in the theory of fractional calculus and also with widespread engineering application of fractional-order systems, analog implementation of fractional-order integrators and differentiators have received considerable attention. This is due to the fact that this powerful mathematical tool allows us to describe and model a real-world phenomenon more accurately than via classical “integer” methods. Moreover, their additional degree of freedom allows researchers to design accurate and more robust systems that would be impractical or impossible to implement with conventional capacitors. Throughout this thesis, a wide range of problems associated with analog circuit design of fractional-order systems are covered: passive component optimization of resistive-capacitive and resistive-inductive type fractional-order elements, realization of active fractional-order capacitors (FOCs), analog implementation of fractional-order integrators, robust fractional-order proportional-integral control design, investigation of different materials for FOC fabrication having ultra-wide frequency band, low phase error, possible low- and high-frequency realization of fractional-order oscillators in analog domain, mathematical and experimental study of solid-state FOCs in series-, parallel- and interconnected circuit networks. Consequently, the proposed approaches in this thesis are important considerations in beyond the future studies of fractional dynamic systems.
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Current-Mode Multifunctional Filter Utilizing Losses of Inductor Simulator
Kartci, Aslihan
In this paper, a simple configuration for simulating the inductance using voltage differencing current conveyor (VDCC) as an active element has been presented. The proposed inductance simulator circuit uses only one VDCC, one current amplifier (CA), and one grounded capacitor. The equivalent value of the realized simulator can be tuned electronically through the transconductance parameter and current gain of the VDCC and current gain through the CA. The proposed circuit behavior together with its application is demonstrated using PSPICE simulations with commercially active devices. Functionality of the proposed circuit is verified through its application in the second-order circuit. The circuit that behaves as a filter, has one input and standard three output responses such as low-pass filter (LPF), band-pass filter (BPF), and high-pass filter (HPF).
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Design of RC sinusoidal oscillator based on active building blocks
Režňák, Patrik ; Šotner, Roman (oponent) ; Kartci, Aslihan (vedoucí práce)
Thesis is focused on RC oscillators employing active building blocks and operational amplifiers. In the beginning, review of available literature talking about this topic is done. Different building blocks and circuits containing those blocks are picked and some of them simulated with PSpice and SNAP programs. Oscillation creation and influence of circuit components is verified. Those circuits are realized in practical application and simulation results are compared to those gained from real world circuits, also the chosen circuits are compared between each other.
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Design of RC sinusoidal oscillator based on active building blocks
Režňák, Patrik ; Šotner, Roman (oponent) ; Kartci, Aslihan (vedoucí práce)
Thesis is focused on RC oscillators employing active building blocks and operational amplifiers. In the beginning, review of available literature talking about this topic is done. Different building blocks and circuits containing those blocks are picked and some of them simulated with PSpice and SNAP programs. Oscillation creation and influence of circuit components is verified. Those circuits are realized in practical application and simulation results are compared to those gained from real world circuits, also the chosen circuits are compared between each other.
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Optimization of Multilayer Perceptron Training Parameters Using Artificial Bee Colony and Genetic Algorithm
Kartci, A.
In this paper, the momentum coefficient, learning rate, and the number of hidden neurons where the multilayer perceptron works best, are determined. The network and optimization algorithms are written in MATLAB, which was also successfully used to carry out results. To obtain the results, IRIS, mammographic_mass, and new_thyroid data sets have been used. Obtained results show that the determining effect on the neural learning process of parameters (momentum coefficient, learning rate, number of hidden neurons) are compatible with other approaches available in the literature. Both genetic algorithm (GA) and artificial bee colony (ABC) algorithm were successful on finding the values to get high performance as well as effect on performance of the population number.
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General Floating Element Simulator Employing VDCCs and Grounded Components
Kartci, A.
In this study, a new general floating element simulator circuit employing two voltage differencing current conveyors (VDCCs) and three passive components is proposed. Depending on the passive component selection the presented circuit can realize floating frequency dependent negative resistor (FDNR), floating inductor, floating capacitor, and floating resistor simulator circuits. The circuit does not require any component matching conditions. Moreover, the proposed FDNR, inductance, capacitor and resistor simulator can be tuned electronically by changing the biasing current of the VDCC or can be controlled through the grounded resistor(s) if voltage controlled resistor is considered. The proposed floating inductor or capacitor simulators are verified in voltage-mode 3rd-order elliptic low-pass filter circuit simulated via SPICE using 90 nm, level 7 PTM CMOS technology parameters.
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