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An EMC Robust Precise Voltage Reference for Automotive Applications
Krolák, David ; Husák, Miroslav (referee) ; Psychalinos, Professor Costas (referee) ; Horský, Pavel (advisor)
Klíčovou součástí moderních integrovaných obvodů je napěťová reference, která funguje jako srdce analogových bloků poskytující stabilní napětí. Tato disertační práce zkoumá pokročilé metody pro snížení citlivosti nízko příkonových referencí na elektromagnetické interference (EMI) pro automobilová prostředí s širokým teplotním rozsahem. Citlivost na EMI je nežádoucí jev, který může způsobit poruchy elektronického systému. Elektromagnetické rušení se může snadno vázat do obvodu prostřednictvím kabelového svazku a desky s plošnými spoji. Práce poskytuje přehled literatury, návrhy výzkumu a výsledky, které se zaměřují na skryté efekty v napěťovém referenčním jádru, jako je vliv parazitní kapacity z kolektorů bipolárních tranzistorů do substrátu integrovaného obvodu a efekty použitého operačního zesilovače. Jsou uvedena a implementována doporučení pro zlepšení EMI odolnosti napěťové reference. Aby se prokázala platnost navrhovaných vylepšení, byly vyrobeny a změřeny testovací čipy s navrženými napěťovými referencemi v různých technologiích.
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Design of precise bandgap reference in ACMOS process
Kacafírek, Jiří ; Prokop, Roman (referee) ; Ing. Petr Kadaňka, ON Semiconductor v Rožnově p. Radhoštěm (advisor)
In this thesis the principle of voltage reference especially bangap reference is described. Below are described two circuits of this type designed in ACMOS process. There is handmade evaluation of error analysis to identify main error contributors and also monte-carlo simulation. Also statistical analysis is made on the circuit. Results of all methods are compared. Error of reference voltage is compared for both circuits. Circuit with bigger error is optimized to achieve a better precision. Obtained results showed a good agreement of all methods, which evidences importance of hand error evaluation.
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Design of DA converter with fully differential output in CMOS technology
Mácha, Petr ; Prokop, Roman (referee) ; Kledrowetz, Vilém (advisor)
This diploma thesis deals with the design of eight-bit digital to analog coverter with fully differential outputs in technology I3T25 of ON Semiconductor company. The work contains the description of basic structures and characteristics of digital to analog converters. The main focus of the work is to design a converter and auxiliary circuits at the transistor level. The functionality of designed circuits is verified by simulation environment Cadence.
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Weight Measurement with Bathroom Scale Strain Gauges
Šenfluk, Petr ; Fuchs,, Michal (referee) ; Povalač, Aleš (advisor)
The aim of the thesis is weigh measurement using strain gauges from cheap digital scales. Work describes problems connected with using strain gauges as temperature compensation and requirements for accurate voltage reference and summarize function and wiring of chaep digital scales using four strain gauges. Result of work is design of an electrical circuit for weigh measurement using four strain gauges from analyzed scale.
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Tutorial kits for course Powering electronic devices
Pochobradský, Jakub ; Švábeník, Petr (referee) ; Kubíček, Michal (advisor)
The goal of this bachelor thesis is to make a design of tutorial kits with a charge pump, DC/DC converter and a reference voltage and current sources that could be used in laboratory classes. In the first part basic principles of a charge pump and DC/DC converter are described. The second part is related to integrated circuits that are specific for construction of charge pumps and DC/DC convertors. The third part contains design of printed circuits.
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Design of a pressure monitor for biomedical applications
Tenora, Jan ; Kolka, Zdeněk (referee) ; Biolková, Viera (advisor)
The goal of this bachelor’s thesis was to gather requirements for the realization and functional features of the proposed pressure monitor. Based on the collected requirements, the block diagram and also the complete schematic were proposed. Then the printed circuit board was designed, made and fitted. This board was placed into prepared box together with other components. Finished equipment was tested, set and also precision was checked by its measurement. Finally, user guide and also service manual were written.
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General-purpose power supply with microcontroller
Jorda, Ivo ; Vyskočil, Pavel (referee) ; Brančík, Lubomír (advisor)
The aim of this thesis is design of adjustable switched mode power supply with symmetrical output of 25 V, and switched mode power supply with fixed output voltage of 5 V. Required maximum output current of each outputs is 3 A. At the beginning of the paper function of the basic SMPS topologies is described. Next all reqiured SMPSs are designed and chosen parts of the design are simulated. In the second half of the thesis assembly and testing of PCB are described as well as functions of programs. Last chapter contains results of meassurement of power supply paramters.
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Design of voltage references in BiCMOS ONC18 process
Dušek, Samuel ; Prokop, Roman (referee) ; Šotner, Roman (advisor)
This bachelor's thesis deals with design of voltage references in 180 nm technology of the ON Semiconductor company with main focus on the lowest value of power supply. First part presents theoretical knowledge concerning voltage references. The next part introduces chosen topologies, describes their function and methods of initial design. In this part there are also shown results which were achieved after initial design and after optimization of all references. The last part appraises the best replacement for bandgap etalon in area of power supply, where bandgap reference can not work properly.
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Design of low-voltage supply and reference block based on the bandgap reference
Zwiener, Jan ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This diploma thesis deals with the analysis and evaluation of four different circuit solutions that are used to construct a stable reference voltage. In the literature, these circuits are referred to as bandgap references, and this thesis discusses the principle of their operation. Based on the achieved results, one circuit solution was selected, which forms the basis of the designed device containing eight reference voltages with values (0.8; 1.0; 1.2; 1.5; 1.8; 2.0; 2.5; 3.3) V and one voltage supply, to which one of the reference voltage values can be assigned using a binary code. This device contains sources of four reference currents with values (1; 2; 4; 8) µA.
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Electrotherapy
Slavíček, Milan ; Rampl, Ivan (referee) ; Chmelař, Milan (advisor)
Aim those work is suggest simple generator for electropathy. In exordium deal with features weaving and fission current used in the electrotherapy. Draft part then includes proposal single part generator and calculations needed to achievement purposes. Result is then diagram simple generator for production Träbert flows and list parts.
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