|
|
Comlete design of class D power amplifier
Bistrý, Jan ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
In this bachelor's project was at first described a principle of class D power amplifiers. There was performed a characteristic of particular blocks. In the concrete steps were described particular solutions of these amplifiers with PWM driver, amplifier as an IC chip and were described advantages of this topology. It was performed an overview of the modern integrated amplifiers which are currently available. According to further requirements of this bachelor's project were designed a scheme and a board of printed circuit for this amplifier. In more details were described possibilities of output LC filter and performed its simulation. At the conclusion of this project was performed a laboratory measurement of realized amplifier which verified its performance and compliance with engaged parameters.
|
|
| |
|
|
All-pass filters with various active devices
Novotný, Jakub ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The theme of the semester project is to provide an overview of the function and use of analogue all-pass filters. It deals with their specific implementation using active functional blocks, i. e. using LT1228 transconductance amplifier manufactured by Linear Technology, using transimpedance amplifier AD844 manufactured by Analog Devices and using negative three port second generation current conveyor EL2082 manufactured by Intersil (formerly Elantec). Further outlines the concept of laboratory exercises on all-pass filters with the aforementioned integrated circuits. The exercise will consist of three separate units.
|
|
|
Design of class AB stereo audio power amplifier
Podr, Michal ; Šotner, Roman (referee) ; Brančík, Lubomír (advisor)
This thesis describes the design of a complete amplifier operating in class AB. It contain two power amplifiers with working in the bridge mode correction amplifier with volume control, bass, treble, and also with the choice of loudness. Preamplifier with three different inputs and the choice between stereo and mono modes.
|
|
|
Utilization of circuit elements described by fractional-order dynamics in analog phase shifters
Zedka, Radim ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
This document deals with fractional passive dipole structures, their mathematical description, design methods and practical use with respect to limited frequency range. Two fractional dipole design methods are being described while one of them is used for practical realization of three fractional dipole samples. All of them are well measured and documented. Analog phase shifters implementing this fractional-order dipole are being discussed theoretically and they are practically constructed and measured. Concisely the fractional-order two-port design method implementing biquadratic filters is described.
|
|
|
Model of four-quadrant analog multiplier AD835 for PSpice
Kuřátko, David ; Brančík, Lubomír (referee) ; Šotner, Roman (advisor)
This bachelor's thesis deals with the analog behavioral modeling of the AD835 multiplier and its simple applications in PSpice. The first part of this thesis is focused to the theoretical analysis of analog multiplier in general. This is followed by an analysis of individual elements, which are suitable for modeling of this multiplier AD835 and possibility of substitution by other elements. The next part deals with the description of the multiplier AD835, an analysis of the proposed model and confirmation of several parameters with measurement. Finally, there was noted several applications with analog multiplier AD835. Simulation results of these applications are compared with ideal expectations.
|
|
|
Portable music player
Rozsíval, Adam ; Šotner, Roman (referee) ; Dřínovský, Jiří (advisor)
The thesis deals with the project of a portable music player with an amplifier in the class D. The device is powered up by connected power supply unit, eventually by built-in accumulator. Audio signal is played by bluetooth module, sound card or headphone output. Switching inputs and power supply of the accumulator is managed by a micro-controller. A correction equalizer for sound control is also embedded in the booster. All peripheries are put into a wooden baffle board. The sound is reproduced by a pair of loudspeakers.
|
|
|
Realizations of mathematical model of wind turbulations as lumped electronic circuits
Bürger, David ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
This semester work deals with implementation of the mathematical model known as modified Lorenz system as an electronic circuit with lumped parameters. Dynamical system is autonomous, deterministic and is described by a set of first-order ordinary differential equations. Our aim is to derive three different circuitry realizations each having specific properties. In the first case realization is canonical in the sense of the integrator block conception where the internal system parameters are adjusted by three potentiometers. Second realization represents modification towards independent adjustment of all four system parameters and, consequently, to tracing dynamical evolution of model solution. Last oscillator, on the contrary to previous circuits, work in current mode rather than voltage regime.
|
|
|
Measurement setup for DC, AC and transient testing of two-ports
Káňa, Vojtěch ; Hruboš, Zdeněk (referee) ; Šotner, Roman (advisor)
This master´s thesis describes about automated measurements of two – ports of frequency, time and DC area. Gradually, there is elaborated several theoretical foundations dealing with this issue. For example, different types of buses, available programs and general theory of two – ports circuits. Also a method for solving and implementing a measuring device for communication between apparatuses and DUT is designed and described. In conclusion, the results and evaluation of measurement are processed.
|
|
|
Shaping networks and limiters for educational laboratory purposes
Barč, Andrej ; Domanský, Ondřej (referee) ; Šotner, Roman (advisor)
This bachelor thesis deals with design and implementation of shaping diode circuits and double - sided diode limiter of sinusoidal signal for laboratory use in low frequency band. This is a 3-segments and 6-segments shaping circuit with and without active element (without operational amplifier). The circuits form a triangular signal to harmonic signal. The aim of the design was to achieve the least possible distortion of the output signal on the largest frequency range of usability. The functionality of the circuits was verified by measurement and a laboratory protocol was constructed from the measurement result. The measurement results were compared with the results of ideal simulated waveforms.
|
guest ::
