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Design of low-voltage operational amplifier
Sysel, Jan ; Šteffan, Pavel (referee) ; Khateb, Fabian (advisor)
This work deals with the design of operational amplifier with extremely low supply voltage and low power consumption. In the theoretical part is presented theory dealing with the structure and design of operational amplifier. In the following part are desribed design methods suitable for realization of low-voltage circuits. In the next part were designed two operational amplifiers using low-voltage design methods. Properties of these operational amplifiers were then tested by simulations.
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Design of Digital Circuits at Transistor Level
Kešner, Filip ; Šimek, Václav (referee) ; Vašíček, Zdeněk (advisor)
This work aims to design process of integrated circuits on the transistor level, specially using evolutionary algorithm. For this purpose it is necessary to choose reasonable level of abstraction during simulation, which is used for evaluation candidate solutions by fitness function. This simulation has to be fast enough to evaluate thousands of candidate solutions within seconds. This work discusses already used techniques for transistor level circuit design and it chooses useful parts for new design of faster and more reliable automated design process, which would be able to design complex logic circuits. The thesis also discusses implementation of this system and used approach with regard to encountered problems in transistor-level circuit design and optimization by evolution.
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Software for DSLR control for use in microscopy
Mokrejš, Jakub ; Janoušek, Oto (referee) ; Čmiel, Vratislav (advisor)
This master's thesis initially deals with a review of cameras used in microscopy, describing their properties and the difference between microscopic and DSLR cameras. Furthermore, it describes the programs used by microscopic cameras for control via a computer. The thesis then defines the technologies used for software development and presents a design of the software's program equipment. The practical part of the thesis first describes the technologies used for software development along with a development diagram. The next section describes the functions that the software uses to communicate with the DSLR camera and introduces the software's graphical user interface. The conclusion of the practical part is devoted to testing the software itself, where it also presents various ways of its control. The test results are then evaluated in the discussion.
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Curvature correction of the BandGap reference output voltage
Žeravík, František ; Háze, Jiří (referee) ; Prokop, Roman (advisor)
This thesis deals with the design of a Brokaw BandGap reference, a BandGap reference in a simple CMOS process, as well as the respective compensation circuits for correcting the curvature of the output voltage. In the theoretical part, the emphasis is mainly on describing the temperature dependency of the UBE voltage of the bipolar transistor and understanding the principle of the elementary BandGap reference. Based on these findings, the function and design of both BandGap references for an output voltage of 1.5 V are described. In the second part, the thesis focuses on describing various methods for correcting the curvature of the output voltage. Based on these methods, the first-order BandGap references supplemented with compensation circuits are designed. In the conclusion, the resulting parameters of the designed BandGap references without correction and with a compensation circuit are summarized and compared.
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Design of a SAR AD converter with switched capacitors
Sysel, Jan ; Kledrowetz, Vilém (referee) ; Prokop, Roman (advisor)
This work deals with the design of analog to digital converter with a successive approximation register for automotive industry with the range of operating temperatures from -40 °C to 175 °C and with the use of DAC with switched capacitors between interconnect metal tracks in an integrated circuit to minimize converter area. Theoretical part deals with the basic theory of analog to digital converters, principle of converter with a successive approximation register with the utilization of capacitive DAC. Then with the design of capacitors for the DAC in an integrated circuit made of metal layers and vias and their layout to minimize parasitic capacities. In the practical part is made the theoretical design of the converter on block level. Then is done the design of a capacitor for this DAC and layout of the whole DAC is made. On the transistor level are designed and verified blocks required for realization of this converter: circuit of voltage follower, operational amplifier, comparator and switches. Inside the converter the self-test circuit is implemented for measurement of its own nonlinearity. In the work the functionality of the converter is verified as a whole.
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Saving power and area with multi-bit pulsed latches
Král, Vojtěch ; Horský, Pavel (referee) ; Dřínovský, Jiří (advisor)
Diplomová práce se zabývá typy výkonových ztrát v technologii CMOS a následně jejich řešením metodami nízké spotřeby, které lze použít v oblasti zákaznických integrovaných obvodů. Jednou z možných metod pro nízkou spotřebu výkonu je vícebitový pulzní klopný obvod, který lze použít jako náhradu za standardní vícebitový klopný obvod typu master-slave. Vícebitový pulzní klopný obvod se skládá ze dvou částí, pulzního generátoru a pulzního klopného obvodu. V diplomové práci jsou popsané topologie, které mohou být použité. Konečná topologie byla vybraná na základě nízké spotřeby a plochy. Z vybrané topologie je vytvořeno schéma vícebitového pulzního klopného obvodu, které je porovnáno se schématem vícebitového klopného obvodu. Následně jsou vytvořeny layouty potřebných vícebitových pulzních klopných obvodů a porovnány jsou se standardními layouty vícebitových klopných obvodů. V závěru práce jsou navrhnuté vícebitové pulzní klopné obvody odsimulovány v jednoduchém designu.
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Design of low-voltage operational amplifier
Sysel, Jan ; Šteffan, Pavel (referee) ; Khateb, Fabian (advisor)
This work deals with the design of operational amplifier with extremely low supply voltage and low power consumption. In the theoretical part is presented theory dealing with the structure and design of operational amplifier. In the following part are desribed design methods suitable for realization of low-voltage circuits. In the next part were designed two operational amplifiers using low-voltage design methods. Properties of these operational amplifiers were then tested by simulations.
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Design of differential difference amplifier (DDA) for biological signals processing
Grochal, Peter ; Šteffan, Pavel (referee) ; Khateb, Fabian (advisor)
The work deals with the analog design of low-voltage and low-power differential difference amplifier DDA with adaptive differential input stage, second stage class AB, improved by a self – cascode to achieve higher gain and slew rate. Conventional and unconventional techniques, and methods for low-voltage and low-power design are presented. The finished design of the differential difference amplifier DDA with the analyzed results is presented. Design of a Butterwortho low-pass filter of the sixth order based on DDA with Sallen Key topology and design of a multifunctional ARC filter based on DDA.
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Injection locked ring oscillator design for application in Direct Time of Flight LIDAR
Fránek, Jakub ; Háze, Jiří (referee) ; Kledrowetz, Vilém (advisor)
Diplomová práce přibližuje systémy LIDAR přímo měřící čas průletu a časově digitální převodníky určené k použití v těchto systémech. Představuje problematiku distribuce hodinových signálů napříč soubory časově digitálních převodníků v LIDAR systémech a věnuje se jednomu z nových řešení této problematiky, které je založené na injekcí zavěšených oscilátorech. Technika injekčního zavěšení oscilátorů je důkladně matematicky popsána. V programu Matlab byl vytvořen simulační model injekcí zavěšeného kruhového oscilátoru, který potvrzuje správnost uvedených analytických predikcí. Ve výrobní technologii ONK65 byl navržen injekcí zavěšený kruhový oscilátor stabilizovaný pomocí smyčky závěsu zpoždění, určený pro implementaci časově digitálního převodníku pro systém LIDAR. Navržený injekcí zavěšený kruhový oscilátor byl verifikován počítačovými simulacemi zohledňujícími vliv procesních, napěťových i teplotních variací. Oscilátor poskytuje specifikované časové rozlišení 50 pikosekund a dosahuje dvakrát nižší hodnoty fázového neklidu než ekvivalentní volnoběžný oscilátor v dané technologii.
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