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Non-linear circuit structures with active current elements
Langhammer, Lukáš ; Lattenberg, Ivo (referee) ; Koton, Jaroslav (advisor)
This thesis deals with non-linear curcuit structures with current active elements. In its introduction this work deals with a description of the current conveyor. Further the text pays attention to the possiblities of the circuits for modification signals in analogue technology. First are described circuits of diode limiters and transducer. Great attention is paid to the amplifiers with current active parts. In conclusion are realized circuits of universal precise full-wave rectifiers using operational amplifier and current conveyor and made comparisons.
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Temperature regulator with ESP8266
Vymazal, Tomáš ; Hanák, Pavel (referee) ; Lattenberg, Ivo (advisor)
The bachelor thesis mainly focuses on a development of a smart socket thermostat able to communicate with a user and other applications via Wi-Fi interface in the 2.4 GHz band. Subsequent centers of attention are electrical temperature measurement and analysis of IoT clouds, currently used for logging and visualization of gauged data. Essential part of the work is the detailed depiction of PCBs development from their design to the particular stages of progress. The last but not least are the firmware measures and the regulation functionality verification.
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Filters with current mirrors
Kotlán, Petr ; Herencsár, Norbert (referee) ; Lattenberg, Ivo (advisor)
A second-order frequency-selection filters with current amplifier design is shortly shown in this bachelor's thesis. An autonomous circuit was modified to be conform with all rules of functionality of filters. A few version of autonomous circuit are shown i this text. The circuits were simulated by a program Microcap expecially transient and AC analysis. The current amplifier was replaced by a current mirror or more precisely by a current inverter. A direct-current and his relations to suplied harmonic signal were investigated. A deformation of a harmonic signal is unwanted. This deformation is ussualy created by the transistors in nonlinear mode. This current have to have special ratio to the alternating-current. A sixth-order filter was created by cascade connection of three second-order blocks. This more intricated circuit is correct. A correct rate of characteristic due for low-pass, high-pass and band-pass was shown thanks AC analysis.
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Model-View-ViewModel design pattern in WPF applications
Švikruha, Patrik ; Zeman, Kryštof (referee) ; Lattenberg, Ivo (advisor)
The thesis deals with the explanation of the proposal application according to multi-layered presentation models which describe the distribution of the application layers thereby its facilitating, testability, sustainability and transferability. In this work i focus myself on presentating model for Model-View-ViewModel which is primary designated for WPF application. This presentating model is possible to be built by frameworks used as NuGet open-source package managers or Project templates. In this thesis I focus on framework Catel, which can be used thanks to it´s robustness through all layers of application. The primary output of this thesis is a real application, on which I demonstrate design template with the intagration of framework Catel. I tried to describe whole theory and following process as easy as possible, that even an reader, who has no experiences with designing a multilayer application, could understand it.
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Solution proposal and analysis of properties of current operational amplifier in bipolar and unipolar technologies
Pawlas, Radovan ; Lattenberg, Ivo (referee) ; Vrba, Kamil (advisor)
This master thesis is about current operational amplifiers and mainly about their internal structures and possible modifications of these structures. The Current operational amplifier consists of several elementary blocks and these blocks are shortly described and used in internal structures of proposed operational amplifiers. Basic elementary blocks of the current operational amplifier are current mirror, diferentional amplifier, current source, transimpedation amplifier and additional elements of a circuit. In this thesis, several elementary structures of the operational amplifiers are introduced. Each amplifier passed through the analysis of the circuit in software MicroCap 9.0. In this software is done the simple DC analysis of the internal structure of the current operational amplifier in connection with a feedback. The solution was focused on bipolar and unipolar technology for each connection. I deal with a method of feedback connection to the operational amplifier and explore real characteristic of the appropriate amplifier in the designed feedback. In principle this design has important influence to the resulting properties of the circuit. Within the analysis of the circuits have been found, how each current operational amplifier works in a defined current range. Every type of surveyed amplifier is closely described, the internal structure is depicted and graph of current transmission of amplifier is shown. At the end of this thesis the amplifiers are compared and there are introduced their advantages and disadvantages.
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Frequency filters with tunable current amplifier
Jemelík, Lukáš ; Lattenberg, Ivo (referee) ; Jeřábek, Jan (advisor)
The bachelor thesis deals with the designing of active frequency filters of the second – order which are make use of active elements. These filters were designed by means of autonomous circuits. Digitally Controlled Current Amplifier DCCA and Multiple Output Current Follower MO-CF were used as active elements. Designed filters works in current mode. The bachelor thesis is divided into five chapters. In the introductory part there are described general characters of frequency filters, the second part contains the description of the active elements, the third part includes the method of construction high – order filters. In fourth part there are described particular circuitry, their transmission functions and confirmation of their functionality in computer software.
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Methods of access to PostgreSQL databases in .NET Framework
Henzl, Václav ; Kouřil, Jiří (referee) ; Lattenberg, Ivo (advisor)
The results of this work are two major projects - NpgObjects and PagedDataGridView. NpgObjects is a simple ORM framework to enable the mapping database tables to objects in the common language runtime. It contains a specially designed generator which generates classes in C# from information obtained from the database. These classes are mapping on the database tables one to one. NpgObjects allows all the basic database operations - SELECT, INSERT, UPDATE and DELETE. PagedDataGridView is a component for displaying tabular data. In cooperation with NpgObjects can paginate database data and manage the flow of data into application. It provides a comfortable user interface, which can easily navigate between different pages of data.
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DNS protocol client with a graphical interface suitable for lecturing
Sousedík, Tomáš ; Lattenberg, Ivo (referee) ; Jeřábek, Jan (advisor)
This thesis describes DNS protocol and messages it uses to obtain desired information. The protocol is described from its creation and occasions that caused the creation of the protocol. Later on are discussed multicast capabilities of name resolution this section is focused on mDNS and LLMNR. In the second part is detailed description of the structure of the messages and their useage. In the last part is described the design of the application, which was based on the specifications listed in RFCs. One chapter is devoted to a detailed description of the application and its individual parts. A large part is devoted to the testing. There are also described problems that occurred during application development and their solutions.
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