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The Modelling of the Delta-Sigma Modulators Modern Structures Utilizing Switched-Current Technique
Pavlík, Michal ; Ďuračková, Daniela (referee) ; Hudec, Lubomír (referee) ; Vrba, Radimír (advisor)
The thesis deals with an influence of the errors caused by utilization of the switched-current (SI) approach in the delta-sigma modulators. The basic block of the SI technique is current memory cell (CMC). The analysis of the errors starts with the design of the CMC using CADENCE software and AMIS CMOS 0.7 um technology. Based upon analysis of the CMC no ideal transfer function and advanced techniques of their behavior modeling are depicted. The mathematical models were made and implemented using MATLAB SIMULINK software. The models are very universal. Therefore, it is possible to analyze various structures of the delta-sigma modulators using demanded technology. The influence of the SI technique approach errors sources, on the modulators behavior with the CMC of the 1st and 2nd generation, is concluded at the end.
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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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Modular approach to desing of modern analog devices in CMOS technology
Prokop, Roman ; Ďuračková, Daniela (referee) ; Hudec, Lubomír (referee) ; Musil, Vladislav (advisor)
The presented dissertation thesis deals with modular design of analog circuits in CMOS technology. The goal of the work is to design a set of modular microelectronic building blocks and realize the selected modern active circuits, working primarily in current mode. Nevertheless, the modular approach can be used for design of generally known classical elements, e.g. opamps, as well. As a part of the work, the development of the totally new highly versatile active circuit CCTA has been done, including detailed analysis of utilization and introduction of the most interesting applications. This circuit CCTA, together with relative, already theoretically treated circuit CDTA, has been realized here for the first time, in two different topologies. Final circuits were tested. On the basis of measurement results the library of behavioral models for PSpice was created, including exemplary simulations of the selected applications. Based on the obtained knowledge the brief comparison of voltage mode circuits and current mode circuits was done.
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