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A Novel Structure of Low-Order High Resolution Delta-Sigma Modulator
Kledrowetz, Vilém ; Husák, Miroslav (referee) ; Michaeli, Linus (referee) ; Háze, Jiří (advisor)
The presented dissertation thesis deals with a novel structure of delta-sigma () modulator which compensates influence of higher harmonic distortion and therefore it is possible to achieve high resolution up to 16 bits. This novel proposed structure combines advantages of one bit quantizer modulators with mutli-bit modulators. The novel second order structure is presented, correct function is verified in MATLAB simulation enviroment and requirements for partial block are studied. The second part of the work deals with design of converter with novel structure of modulator using switched capacitor technique utilizing ONSemi I3T25 technology. Advantages and disadvantages of the novel structure are evaluated and novel structure is compared with common structures of modulators.
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Design of anti-aliasing filter for discrete-time delta-sigma modulators
Vogel, Vojtěch ; Háze, Jiří (referee) ; Kledrowetz, Vilém (advisor)
This work deals with the design of a second order anti-aliasing filter with a cutoff frequency in the order of hundreds of kHz using the switched capacitor technique. The use of this technique allows the design of accurate and tunable analog circuits without the use of resistors. In this work, the design of analog switches is described. Furthermore, the various circuits required for the design of the filter in the onsemi I3T80 technology are proposed.
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Design of a New Structure of an Active Filter on Transistor Level
Michalička, Filip ; Dvořák, Jan (referee) ; Bečková, Zuzana (advisor)
Bachelor's thesis deals with designs of new structures of active frequency filters which operate in voltage mode using active element designed on transistor level. The first part describes parameters and kinds of basic frequency filters and types of aproximation. The second part contains a briefing of unipolar transistors, MOS transistor and his properties. The next part deals with method of signal flow graphs and describes the topology of leap-frog frequency filters. Practical part shows transistor based design of an operational transconductance amplifier using transistors TSMC 0,18 µm from the Taiwan Semiconductor company and designs of two new structures of frequency filters using leap-frog topology. Last part presents schematic diagrams from simulation programms. Verification the function of the operational transconductance amplifier and analysis of the new filter structures is performed by simulation programms OrCAD Capture and PSPICE.
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Low-voltage low-power rectifiers for biological signals processing
Bárta, Jakub ; Háze, Jiří (referee) ; Kledrowetz, Vilém (advisor)
This thesis deals with the design of precision rectifier for low voltage and low power aplocations in CMOS technology. First chapter introduces most common biological signals and it’s acquision and processing. Second chapter describes different types of rectifiers it’s usability in low power aplications and suitability for biomedical signal processing. Third chapter shows different operational amplifier topologies used in precision rectifier circuits. Fourth chapter deals with design of precision rectifier using different operational amplifier structures and it’s comparison.
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NEW PRINCIPLES OF GATE CAPACITANCE CHARACTERIZATION FOR SIGMA-DELTA MODULATORS
Sutorý, Tomáš ; Ďuračková, Daniela (referee) ; Husák, Miroslav (referee) ; Kolka, Zdeněk (advisor)
This thesis deals with the utilization of new principles of characterization of gate capacitances for sigma-delta modulators. Sigma-delta modulators are the integral part of sigma-delta analog-to-digital converters. The proposed new method is characterized by high resolution and modest requirements for laboratory equipment. It allows characterizing capacitances whose values are within the range which is used in sigma-delta modulators. The thesis contains description of the new method, the analysis of measurement accuracy and experimental results.
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Design of a comparator with offset compensation in CMOS technology
Hylský, Josef ; Vávra, Jiří (referee) ; Kledrowetz, Vilém (advisor)
This work contains basic knowledge about comparators and its design in the CMOS technology. The first chapter deals with a wide use of a comparator, its charakteristice and the CMOS technology that is used to produce the transistors for the implementation of comparators. In the two following chapters there are examples of connexion of comparators, the design of the two-stage open loop comparator and improving of its charakteristic. The preamplifier and its application in high-speed Latchs comparators are introduced in the next chapter. The design of the comparator are introduced inthe next chapter. The design of the comparator and its application in high-speed comparators are introduced in the next chapter.
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