|
|
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.
|
|
|
Design measure amplifier for magnetic measurement
Hejtmánek, Tomáš ; Steinbauer, Miloslav (referee) ; Roubal, Zdeněk (advisor)
The purpose of this semester work is a design of a measuring preamplifier for a fluxmeter DTEE which is used for hysteresis loops on ferromagnetic materials measurements. Having respect to measure coils’ characteristics and processed voltage levels with ranges in nV and µV, there was necessary to investigate measure principles of such low voltage. And then choose an appropriate operational amplifier based on the result. Mainly with minimum input residual voltage and offset temperature dependency. Also was necessary to propose effective zero compensation and eliminate thermoelectric influence in the whole designed device. There was applied noise optimization of selected operational amplifier in PSpise software. The designed device will be assembled and tested. The given results will be evaluated together with possibilities of application for a measurement purposes in labs.
|
|
|
Gaussmeter design with three-axis measuring probe
Hejtmánek, Tomáš ; Novák,, Miroslav (referee) ; Roubal, Zdeněk (advisor)
The purpose of this work is the design of a gaussmeter with a three-axis probe for magnetic field mapping and subsequent reconstruction of the image using magnetic impedance tomography. Commercially available gaussmeters have low bandwidth for these purposes, and signals cannot be measured in synchronous detection mode. The aim of the thesis is select the most suitable magnetic field sensors for the MIT purposes and to design the entire measuring device to meet the measurement requirements in the wider frequency band and synchronous detection. Attention will also be paid to designing a suitable mechanical design of the probe and the location of the sensors. The proposed device will be tested and evaluated for MIT purposes.
|
|
| |
|
|
The design Spice models OA with verification their accuracy
Kučera, Tomáš ; Drexler, Petr (referee) ; Roubal, Zdeněk (advisor)
This bachelor thesis describes the design macromodels of operational amplifiers on the 5th level. Macromodel is designed from the measured parameters of the integrated circuit and created first Boyleho model and later model of multiple pole/zero. The proposed circuits are created using the entire library program OrCAD PSpice. The created macromodel can enter certain common parameters and simulate the manufacturing tolerance and mark modeled to a limited extent, other types of OA. The measured parameters are compared with results of PSpice simulation program and verified the accuracy of the method used for the design macromodel. Models are also suitably modified to simulate the noise voltage.
|
|
|
Controlling ang checking system
Bláha, Jan ; Roubal, Zdeněk (referee) ; Szabó, Zoltán (advisor)
This bachelor thesis focuses on the design, fabrication and testing module 4 independent switching appliances. Switching can be controlled automatically according to the ambient temperature and time, or manually. The equipment includes the measurement of power. In the conclusion, the evaluation and lessons learned or problems in the implementation of module.
|
|
|
Design of a new iontometer with wireless communication and weather station
Kadlček, Václav ; Hrabina, Jan (referee) ; Roubal, Zdeněk (advisor)
This diploma thesis deals with the design of an autonomous system for the measurement of the concentration of atmospheric ions. This is a new version of the already asembled Iontmeter by UTEE FEKT. Unlike the previous version, this new one should be completely independent of electrical network and configurable even without a PC. The design includes increased water and dust resistance, wireless transmission from the weather station and its own temperature, atmospheric pressure and relative humidity sensor.
|
|
|
Implementation of USB/LAN/WIFI interface
Voneš, Jaroslav ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
This bachelor thesis goes into implementing the most modern communication interfaces USB/LAN/WIFI to control the computer itself and also the incubator via a Web interface. The term describes the overall solution to the management of the incubator for using microcontroller ATmega8 with the possibility of the exchange of communication interfaces. For the USB converter was used the circuit FTDI FT232 BM company, from LANTRONIX Ethernet was used for Converter converter XPORT and eventually to communicate the WIFI was elected circuit ESP 8266
|
|
| |
|
|
The construction and design a transformer
Smejkal, Vít ; Steinbauer, Miloslav (referee) ; Roubal, Zdeněk (advisor)
After the general introduction to magnetism the work is further on concentrating on the construction of the transformator with the EI core. The work puts the emphasy especially on the calculation of the otherwise chartered data for the EI cores according to their size and the used material features suitable for the above mentioned core. Current transformer and its design is analyzed in next part. From the gained knowledge are than constructed the suitable procedures for the automated calculations, which are than realized in the Matlab environment.
|
guest ::
RSS feed.