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Adaptive frequency filter
Fröhlich, Lubomír ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
ABSTRACT My diploma thesis is called „Adaptive frequency filter“ and I divided it into four parts. I read up basic qualities of selective functional block 1. and 2. rate of ARC filters at the beginning. Next, I processed possibilities of analogue and digital control of active RC filters´ parameters. The second part deals with a suitable choice of universal functional block 2. rate realizing more types of transfer functions. To the effect I chose Ackerberg – Mossberg´s wiring of universal filter, and I made a designs of particular parameters for it. In the third part I focused on simulations of this filter by the help of the programme Spice for different values and operating opportunities of its parameters. At the close of my diploma work I created a functional sample and I made many experimental metering with both analogue and digital control.
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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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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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Adaptive frequency filter
Fröhlich, Lubomír ; Murina, Milan (referee) ; Sedláček, Jiří (advisor)
ABSTRACT My diploma thesis is called „Adaptive frequency filter“ and I divided it into four parts. I read up basic qualities of selective functional block 1. and 2. rate of ARC filters at the beginning. Next, I processed possibilities of analogue and digital control of active RC filters´ parameters. The second part deals with a suitable choice of universal functional block 2. rate realizing more types of transfer functions. To the effect I chose Ackerberg – Mossberg´s wiring of universal filter, and I made a designs of particular parameters for it. In the third part I focused on simulations of this filter by the help of the programme Spice for different values and operating opportunities of its parameters. At the close of my diploma work I created a functional sample and I made many experimental metering with both analogue and digital control.
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