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Design of a low-noise operational amplifier with 1/f noise analysis
Koukol, Martin ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This thesis is divided into two main parts. The first part deals with the physical description of the MOS transistor noise, focusing on the 1/f flicker noise. The equations for flicker noise in weak and strong inversion in linear and saturation regions and the dependence on transistor dimensions have been derived. These dependencies were verified by simulation. The second part deals with the design of a low-noise rail-to-rail operational amplifier, on which noise analysis was performer and also verified by simulation. The proposed operational amplifier was verified across process and temperature.
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Design of a chopper-stabilized multipath operational amplifier
Mrázek, Petr ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
The main content of this work is the theoretical and practical design of the chosen topology of the chopper-stabilized operational amplifier. The introductory part of the diploma thesis focuses on the theory of noise, offset and drift. In other parts of the work, the origin of these phenomena and the possibility of their elimination are investigated. Furthermore, individual topologies are also analyzed in the work, from which one is chosen, which is then analyzed theoretically. Another part of this work is focused on the block design of the chopper-stabilized operational amplifier, from which the design of the entire system is subsequently created. The last part of the theory is focused on simulating the behavior of the designed chopper-stabilized operational amplifier and comparing it with the theoretical design.
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Generalized design of frequency filters with operational amplifiers
Dokoupil, Drahomír ; Minarčík, Martin (referee) ; Vrba, Kamil (advisor)
This thesis is about general design of frequency-selection filter with help of autonomous circuits. Operational amplifier has been chosen as active device/element. In the begining of this project is described role of frequency-selection filters in electronics circuits, their basic types and their transmission function. Another part of this thesis dissertate about construction of autonomous circuits, selection of suitable admittance network and it's simplification. Selected autonomous circuits are initial elements to find out known connections of frequency-selection filters. Last part of this thesis describing work with SNAP software, ways to find new connection of filter and describe how autonomous circuit works in voltage or current mode.
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Universal monitoring and diagnostic probe for serial communication
Dvořák, Ondřej ; Povalač, Aleš (referee) ; Záplata, Filip (advisor)
The thesis deals with design of a device for communication analysis in standardized serial interfaces, with differing parameters. The goal of the thesis is a complete design of a device including wiring diagrams, PCB, get PCB alive and design complete device firmware. The device will be able to process and analyze data on selected interfaces. The user controls the device with the use of USB interface, connecting the device with a PC or other computing devices. Communication is done by a simple protocol in ASCII, its design is included in this thesis. The device can analyze errors in the interface and inform the user about them. Firmware should be flexible, to allow the addition of more interfaces and protocols.
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Wideband transimpedance photodiode amplifier
Šťastný, Martin ; Roubal, Zdeněk (referee) ; Drexler, Petr (advisor)
This thesis deals with the design of transimpedance amplifier with high gain. There are described different principles of semiconductor sensors of optical signal. There is also a comparison of different methods of converting the photocurrent to voltage. It also discusses the design of an appropriate feedback capacitor in terms of stability in participation as a transimpedance amplifier. It examines the impact of non-zero currents flowing to the input operational amplifier circuit functionality and output offset compensation. Part of the thesis is a simulation that confirms the calculated values. The thesis also deals with the implementation of the receiver and the method of correct measurement of the cut-off frequency.
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Matrix headphone amplifier for studio monitoring
Štěrba, Václav ; Petržela, Jiří (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor´s thesis describes the design of a matrix headphone amplifier for studio monitoring. The proposed amplifier is a purpose-built device to be used in studio sound recording for the mixing of multiple audio channels directed to the interpreters´or performers´ headsets. The device is basically composed of the following parts: An input section for the audio line, a mixing section which secures the setting of individual input levels for each output, an amplifier section allowing the setting of the output signal level for each output, and an output section enabling the connection of headphones. The equipment utilizes a connection to a multi-channel audio signal bus; this bus also provides for remote power supply to all the connected devices. The solution described in the thesis can be defined as alternative monitoring that facilitates quick and easy connection of a required number of monitoring points (in other cases, such monitoring is usually realized by means of individual small mixing consoles).
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Compact Bluetooth multimetr
Kolář, Ondřej ; Kufa, Jan (referee) ; Rozum, Stanislav (advisor)
The first part of bachelor's thesis Compact Bluetooth multimeter discusses Bluetooth Low Energy technology. It describes individual layers and protocols of its communication chain. There are also described some of the electronic ciruits and methods used for measuring in electronics. The second part of the bachelor's thesis describes practical design and implementation procedures of the compact multimeter which communicates with a smartphone application via Bluetooth Low Energy.
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Universal and fully analog oscillator with transconductance amplifiers
Kus, Václav ; Zaplatílek, Karel (referee) ; Hruboš, Zdeněk (advisor)
The aim of this thesis is to design a universal analog oscillator using transconductance amplifiers. For studying behaviour of chaotic dynamical systems can be used systems Class C. Suitable way for the purpose modeling dynamic phenomena arising in these systems is an electronic circuit that exhibits the same behavior as modeled system. After familiarization with the basic principles of synthesis of integrators systems, and studying the involvement of frequently used functional blocks were designed the concept of universal chaotic oscillator using transconductance amplifiers. The functionality of this circuit has been verified by PSpice simulation program. A typical feature of chaotic oscillator is extremely sensitivity to initial conditions. Each small change on the initial parameters can lead to major change in the shape of the attractor. The result of this thesis is a functional sample of a universal chaotic oscillator, which was verified by the dynamic behavior of the given differential equations.
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