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Analogue emulators of fractional-order circuits
Kubát, Pavel ; Langhammer, Lukáš (referee) ; Dvořák, Jan (advisor)
Diploma thesis deals with circuits contain fractional-order elements. The first part of this paper deals with this problem, there were also described methods of design fractionalorder elements and types of circuits containing the fractiona-order elements which can be applied in practice. Used active elements for practical part can be found in the second chapter. Design of GIC circuits and implementation of fractional-order element inside the circuit are shown in the last chapture. Parasitic analysis and stability of frequency filter containing fractional-order element had been also described.
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Aplication of SI, superinductors and FDNR in frequency filters
Mach, Ladislav ; Brančík, Lubomír (referee) ; Petržela, Jiří (advisor)
This thesis explains possibilities to substitute inductors in electronic circuits and at the same times it shows the calculation of individual discrete elements. An inductor may be substituted in two ways. Either by means of a circuit which directly replaces the inductor as a discrete element, or the circuit may be transformed into another one with similar features. For the second option, however, a synthetic FDNR element has to be used. It is a frequency depended negative resistor. Students can try out the use of superinductors, synthetic inductors in frequency filters with a specially designed facility. They also can transform inductivity and capacity arbitrarily in both directions, higher and lower.
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Active Frequency Filters for Higher Frequencies
Fröhlich, Lubomír ; Dostál, Tomáš (referee) ; Biolek, Dalibor (referee) ; Sedláček, Jiří (advisor)
This thesis deals with the synthesis and optimization of frequency analogue filters with modern active elements usable for higher frequencies. The thesis is divided into three parts, the first part deals with the problematic concerning Leap-Frog combined ARC structure. Due to a difficult design, this method is not described in a detail and used in practice, although it shows e.g. low sensitivity. Firstly, a complete analysis of individual filters was made (for and T endings) and consequently these findings were used during implementation of this method to NAF program. Finally, samples of real filters were realized (for verification of functioning and correct design). Another very interesting topic concerning filters is usage of coupled band-pass for small bandwidth, where it is necessary to solve the problems concerning ratio of building elements values, but also price, quality, size of coils, sensitivity, Q factors, coefficients etc. That is why in practice a coil is very often substituted with other equivalent lossy and lossless blocks which create ARC filters structure. The design and the possibility of usage of lossy grounded elements were described here (such as synthetic inductors, frequency dependent negative resistor). Some parts of the design are individual computer sensitivity analysis, setting of usage and quality comparison of individual lossy grounded blocks. Besides, a program for these elements was created, it is useful for a quick design and depiction of transfer characteristics. The third part deals with the usage of tuning universal filters consisting three or more operational amplifiers, which secures its universality and possibility to create different kinds of transfer characteristic. In practice, Akerberg - Mossberg and Kerwin - Huelsman - Newcomb are the most used types of filters. These were also compared with less common universal filters. In the end, the possibility of digital tuning of universal filter with the help of digital potentiometers for filters of 10th order and frequency around 1 MHz was shown.
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Synthetic elements and their applications in practical education
Stolařová, Hana ; Langhammer, Lukáš (referee) ; Šotner, Roman (advisor)
This bachelor thesis deals with solutions of impedance converters suitable for construction of tunable (or adjustable - select) synthetic elements (two-terminals). Simple applications of these synthetic elements in practical education are supposed. The Antoniou impedance converter represents the core device for various solutions of variable synthetic elements applied in ARC filters (based on RLC original) and simple harmonic oscillator. This thesis includes theoretical design of parameters of circuits for required features as well as verification by computer analysis (PSpice) including fabrication dispersion of elements. This thesis also includes design and fabrication of printed circuit board prepared for execution of a testing device with a form wich can be used for educational purposes in courses Design of Electronic filters and Electronic Circuit Theory.
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Analogue emulators of fractional-order circuits
Kubát, Pavel ; Langhammer, Lukáš (referee) ; Dvořák, Jan (advisor)
Diploma thesis deals with circuits contain fractional-order elements. The first part of this paper deals with this problem, there were also described methods of design fractionalorder elements and types of circuits containing the fractiona-order elements which can be applied in practice. Used active elements for practical part can be found in the second chapter. Design of GIC circuits and implementation of fractional-order element inside the circuit are shown in the last chapture. Parasitic analysis and stability of frequency filter containing fractional-order element had been also described.
|
|
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Synthetic elements and their applications in practical education
Stolařová, Hana ; Langhammer, Lukáš (referee) ; Šotner, Roman (advisor)
This bachelor thesis deals with solutions of impedance converters suitable for construction of tunable (or adjustable - select) synthetic elements (two-terminals). Simple applications of these synthetic elements in practical education are supposed. The Antoniou impedance converter represents the core device for various solutions of variable synthetic elements applied in ARC filters (based on RLC original) and simple harmonic oscillator. This thesis includes theoretical design of parameters of circuits for required features as well as verification by computer analysis (PSpice) including fabrication dispersion of elements. This thesis also includes design and fabrication of printed circuit board prepared for execution of a testing device with a form wich can be used for educational purposes in courses Design of Electronic filters and Electronic Circuit Theory.
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|
Active Frequency Filters for Higher Frequencies
Fröhlich, Lubomír ; Dostál, Tomáš (referee) ; Biolek, Dalibor (referee) ; Sedláček, Jiří (advisor)
This thesis deals with the synthesis and optimization of frequency analogue filters with modern active elements usable for higher frequencies. The thesis is divided into three parts, the first part deals with the problematic concerning Leap-Frog combined ARC structure. Due to a difficult design, this method is not described in a detail and used in practice, although it shows e.g. low sensitivity. Firstly, a complete analysis of individual filters was made (for and T endings) and consequently these findings were used during implementation of this method to NAF program. Finally, samples of real filters were realized (for verification of functioning and correct design). Another very interesting topic concerning filters is usage of coupled band-pass for small bandwidth, where it is necessary to solve the problems concerning ratio of building elements values, but also price, quality, size of coils, sensitivity, Q factors, coefficients etc. That is why in practice a coil is very often substituted with other equivalent lossy and lossless blocks which create ARC filters structure. The design and the possibility of usage of lossy grounded elements were described here (such as synthetic inductors, frequency dependent negative resistor). Some parts of the design are individual computer sensitivity analysis, setting of usage and quality comparison of individual lossy grounded blocks. Besides, a program for these elements was created, it is useful for a quick design and depiction of transfer characteristics. The third part deals with the usage of tuning universal filters consisting three or more operational amplifiers, which secures its universality and possibility to create different kinds of transfer characteristic. In practice, Akerberg - Mossberg and Kerwin - Huelsman - Newcomb are the most used types of filters. These were also compared with less common universal filters. In the end, the possibility of digital tuning of universal filter with the help of digital potentiometers for filters of 10th order and frequency around 1 MHz was shown.
|
|
|
Aplication of SI, superinductors and FDNR in frequency filters
Mach, Ladislav ; Brančík, Lubomír (referee) ; Petržela, Jiří (advisor)
This thesis explains possibilities to substitute inductors in electronic circuits and at the same times it shows the calculation of individual discrete elements. An inductor may be substituted in two ways. Either by means of a circuit which directly replaces the inductor as a discrete element, or the circuit may be transformed into another one with similar features. For the second option, however, a synthetic FDNR element has to be used. It is a frequency depended negative resistor. Students can try out the use of superinductors, synthetic inductors in frequency filters with a specially designed facility. They also can transform inductivity and capacity arbitrarily in both directions, higher and lower.
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