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Design of low order high OSR discrete time delta-sigma modulator for audio applications
Dohnal, Jaroslav ; Kledrowetz, Vilém (referee) ; Háze, Jiří (advisor)
Tato diplomová práce si klade za cíl seznámit čtenáře se základním konceptem a principy jednosmyčkových modulátorů . Diplomová práce ozřejmuje čtenáři problematiku delta-sigma () modulátorů s jednou zpětnovazební smyčkou. Zabývá se základními principy převzorkování u číslicově-analogových převodníků a rozšiřuje je o teorii tvarování spektra šumu. Vycházeje z této teorie jsou navrženy tři jednosmyčkové modulátory, které běží na 1024 OSR jako alternativa k běžně používáným modulátorům vysokých řádů. Modulátory jsou implementovány do FPGA společně s rekonstrukčním filtrem a podpůrnými bloky. Nakonec byl zkonstruován hardwarový prototyp pro vyhodnocení implementace navrženého DAC.
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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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Design of Optimized Architectures of Digital Filters for Low-Power Integrated Circuits
Pristach, Marián ; Husák, Miroslav (referee) ; Ďuračková, Daniela (referee) ; Fujcik, Lukáš (advisor)
The doctoral thesis deals with development and design of novel architectures of digital filters for low-power integrated circuits. The main goal was to achieve optimum parameters of digital filters with respect to the chip area, power consumption and operating frequency. The target group of the proposed architectures are application specific integrated circuits designed for signal processing from sensors using delta-sigma modulators. Three novel architectures of digital filters optimized for low-power integrated circuits are presented in the thesis. The thesis provides analysis and comparison of parameters of the new filter architectures with the parameters of architectures generated by Matlab tool. A software tool has been designed and developed for the practical application of the proposed architectures of digital filters. The developed software tool allows generating hardware description of the filters with respect to defined parameters.
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Design of low order high OSR discrete time delta-sigma modulator for audio applications
Dohnal, Jaroslav ; Kledrowetz, Vilém (referee) ; Háze, Jiří (advisor)
Tato diplomová práce si klade za cíl seznámit čtenáře se základním konceptem a principy jednosmyčkových modulátorů . Diplomová práce ozřejmuje čtenáři problematiku delta-sigma () modulátorů s jednou zpětnovazební smyčkou. Zabývá se základními principy převzorkování u číslicově-analogových převodníků a rozšiřuje je o teorii tvarování spektra šumu. Vycházeje z této teorie jsou navrženy tři jednosmyčkové modulátory, které běží na 1024 OSR jako alternativa k běžně používáným modulátorům vysokých řádů. Modulátory jsou implementovány do FPGA společně s rekonstrukčním filtrem a podpůrnými bloky. Nakonec byl zkonstruován hardwarový prototyp pro vyhodnocení implementace navrženého DAC.
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|
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Design of Optimized Architectures of Digital Filters for Low-Power Integrated Circuits
Pristach, Marián ; Husák, Miroslav (referee) ; Ďuračková, Daniela (referee) ; Fujcik, Lukáš (advisor)
The doctoral thesis deals with development and design of novel architectures of digital filters for low-power integrated circuits. The main goal was to achieve optimum parameters of digital filters with respect to the chip area, power consumption and operating frequency. The target group of the proposed architectures are application specific integrated circuits designed for signal processing from sensors using delta-sigma modulators. Three novel architectures of digital filters optimized for low-power integrated circuits are presented in the thesis. The thesis provides analysis and comparison of parameters of the new filter architectures with the parameters of architectures generated by Matlab tool. A software tool has been designed and developed for the practical application of the proposed architectures of digital filters. The developed software tool allows generating hardware description of the filters with respect to defined parameters.
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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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