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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.
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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.
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Laboratory device for courses BPC-VIA/MZPD
Platko, Peter ; Uher, Miroslav (referee) ; Čala, Martin (advisor)
Bachelor's thesis deals with design of laboratory device for BPC-VIA and MZPD courses, device works with data-aquisition card NI myDAQ and LabVIEW enviroment. Document consists of description of NI myDAQ, description and design of waveform generator, description and design of sensor circuits for temperature, humidity, illuminance, revolutions, noise and vibrations. Then a design of device and it's power source, buttons and fans, design of PCB and price calculation. The last chapter describes example programs that are made in LabVIEW enviroment and use signals from device.
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Design of a current feedback operational amplifier
Kšica, Radim ; Fujcik, Lukáš (referee) ; Bečvář, Daniel (advisor)
This Master`s thesis deals with properties of current feedback operational amplifier. The main goal of this work is creation design process of current feedback operational amplifier by using CMOS technology AMIS 0,7 µm. Next goal of this work is attestation of funciton our design process. Last goal is creation the datasheet of our amplifier.
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Precision audio preamplifier for headset measurement
Šimek, Michal ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
This thesis deals with microphone and headphone preamplifier for microtelephone and headset. The design shall meet the electrical interface requirements set out in ITU-T Rec. P.381(08/2012). The design includes a voltage converter, microtelephone bias and both a battery and an external power supply. In this work is also described the design of printed circuit board and the solution of a low noise in the whole circuit. The aim of this thesis is to design, built and embed the laboratory fixture into a metal box. Finally, measure the product on an APx525 audio precision analyzer.
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Fast optical receiver for measurement application
Žádník, Jakub ; Steinbauer, Miloslav (referee) ; Drexler, Petr (advisor)
This bachelor's thesis analyzes the problem of a detection of analog optical signals on frequencies nearing 100 MHz. The theoretical part describes a principle of the basic photodiode types and their parameters including their equivalent circuit and parasitic characteristics. Next we discuss the ideal circuit selection and its components, especially the photodiode and operational amplifier. In the practical part we simulate the circuit in the software Tina-TI and measure chosen photodiodes. After that, real circuit boards are designed, constructed, soldered, tested and adjusted to achieve the best performance possible.
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Analog nonlinear function structures for educational laboratory purposes
Filko, Patrik ; Dvořák, Radek (referee) ; Šotner, Roman (advisor)
This master’s thesis deals with the design and the realization of a laboratory teaching device, which includes two-port parts with nonlinear transmission characteristics corresponding to quadratic, inverse quadratic and cubic functions. It also includes a more complicated design of a polynomial function converter that offers students a practical view of functions mathematically designed while verifying their accuracy in laboratory exercises. The whole concept is supported by the design of the power supply circuit and the harmonic signal generator. The individual features of this project are feasible from components commercially available.
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Lab power supply 0-100 V / 0-100 mA
Hanzl, Ondřej ; Pazdera, Ivo (referee) ; Martiš, Jan (advisor)
The thesis deals with the design of a laboratory source of atypical parameters of the voltage range 0 – 100 V and current 0 – 100 mA, which will be used for testing LEDs, measuring the reverse voltage and characteristics of Zener diodes of unknown data. The power supply will operate in linear mode, where the output part make up a power unipolar transistor controlled by a controlled bipolar transistor. The control section controlling this output stage is a closed control loop with two PI controllers, a differential amplifier and a controlled limiter. In the control circuit, the controllers are arranged in a cascade structure, where the voltage regulator is superior to the current one. Power supply is provided by 2 transformers, one for the power part and the other for the control part. All designed and assembled components will be then placed in a box equipped with a digital measuring device with display.
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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.
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