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Electronically adjustable active elements for the realization of oscillators and function generators
Bokůvka, Tomáš ; Jeřábek, Jan (referee) ; Polák, Josef (advisor)
This thesis is focused on the design, analysis and realization of new oscillator and generator circuits using electronically adjustable active elements. In the opening discussion the aspects of distribution, proposal, properties and oscillation conditions of generators and oscillators are theoretically described. Next, there are presented some electronically adjustable active elements which appear to be suitable for construction of the oscillators and generators. This covers in particular the Operational Transconductance Amplifier OTA, Voltage Control Amplifier VCA and Digitally Adjustable Current Amplifier DACA. Using these elements the six oscillators and two functional generators are presented. Simulation results and design methods are included. Next part is focused on practical realization and measurement. At the end of the thesis the measurement and simulation results are discussed and compared.
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Automatic variable gain amplifier for measuring frequency characteristic of microphone
Bařinka, Václav ; Kubánek, David (referee) ; Hanák, Pavel (advisor)
This thesis deals with design and implementation of device for measuring characteristics of microphone for a laboratory of subject Elektroakustika. This device provides user with measurement of frequency characteristic of chosen microphone, via known characteristics of reference microphone and regulation loop. Thesis contains of introduction to the problem, parts selection and circuit completition, simluations and draft of the device, including it´s front panel. Thesis also deals with a problem of temperature compensation. Simulations were ran in software LTspice, circuit completition in EAGLE and for front panel draft Fusion360 was used.
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Diagnostic examination of Epstein-Barr virus in routine laboratory practice
MILÉŘOVÁ, Lenka
The bachelor's thesis summarizes the existing knowledge about the Epstein-Barr virus. In the practical part it focuses on the laboratory determination of antibodies against viral antigens. The results of the laboratory analysis are used to evaluate the viral penetration of the tested group. the results are compared with data reported in the current literature.
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Electronically adjustable active elements for the realization of oscillators and function generators
Bokůvka, Tomáš ; Jeřábek, Jan (referee) ; Polák, Josef (advisor)
This thesis is focused on the design, analysis and realization of new oscillator and generator circuits using electronically adjustable active elements. In the opening discussion the aspects of distribution, proposal, properties and oscillation conditions of generators and oscillators are theoretically described. Next, there are presented some electronically adjustable active elements which appear to be suitable for construction of the oscillators and generators. This covers in particular the Operational Transconductance Amplifier OTA, Voltage Control Amplifier VCA and Digitally Adjustable Current Amplifier DACA. Using these elements the six oscillators and two functional generators are presented. Simulation results and design methods are included. Next part is focused on practical realization and measurement. At the end of the thesis the measurement and simulation results are discussed and compared.
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