Ph.D. thesis: 157 p., 3 tables, 64 figures, 111 references
The dissertation work was carried out by the applicant during 2017-2021 in accordance with the scientific direction of the Department of Computer Technology of the Vinnytsia National Technical University in particular during the research work «High-performance multi-channel analog-digital self-calibrated monitoring systems and synchronous processing of low-frequency signals», registration number 0120U002205 (January 1, 2020 – December 31, 2022).
The aim of the dissertation work is to increase the linearity of the reproduction characteristics in digital recording systems of analog signals based on ADCs and DACs with weight redundancy.
The object of the study is the process of forming highly linear characteristics of reproduction of analog signals in the digital registration system.
The subject of the research is the development of methods for increasing the linearity of analog signal reproduction in digital registration system based on ADCs and DACs with weight redundancy.
In the dissertation work, the urgent task of increasing the linearity of the reproduction characteristics in systems of digital registration of analog signals based on ADC and DAC with weight redundancy is set and solved.
Scientific novelty of the obtained results. The main scientific result is the creation of methods for increasing the linearity of the characteristics of reproduction systems of digital registration of analog signals by using ADCs and DACs with weight redundancy, namely:
– for the first time, a method of building digital registration system with increased linearity of analog signal reproduction characteristics based on an ADC of accelerated bit-by-bit balancing with weight redundancy was proposed;
– improved:
– a method of creating a current DAC based on imprecise elements, which, unlike existing approaches, by applying weight redundancy allows you to obtain an inseparable characteristic of analog signal reproduction;
– an approach to the construction of an accelerated bit-by-bit balancing ADC, which, unlike the existing ones, allows to increase its speed by substantiating the value of the basis of the redundant positional counting system;
– the method of constructing a DAC based on imprecise elements, which, in contrast to existing approaches, allows obtaining an integral reproduction characteristic by substantiating the value of the base of the redundant positional counting system;
– the approach to the construction of broadband DC amplifiers for high-speed DACs with weight redundancy, built on code-to-current converters using a push-pull structure, was further developed.
Practical significance of the obtained results. The scientific provisions obtained during the writing of the dissertation contributed to the development and creation of highly linear multi-bit analog-digital systems. The main practical results are the following:
1) recommendations for creating a system for digital registration of analog signals with increased linearity of playback characteristics based on ADC and DAC with weight redundancy are proposed;
2) the proposed circuit implementations are protected by Ukrainian patents:
– two-cycle high-linear voltage buffer;
– broadband high-linear two-stroke current-current converter with a grounded load;
– reference voltage sources based on a current generator with temperature drift compensation;
– highly linear current reflectors with high and ultrahigh output resistances.
The main scientific results and practical recommendations were implemented at MAYTEK PLUS LLC, in particular, methods of increasing the linearity of the reproduction characteristics of systems of digital registration of analog signals by using ADCs and DACs with weight redundancy, recommendations for the creation of such systems, as well as schematic implementations of: two-cycle highly linear voltage buffer, broadband high-linear two-stroke current-current converter with a grounded load, a reference voltage source based on a current generator with temperature drift compensation, high-linear current reflectors with high and ultra-high output resistances (implementation act dated 06.09.2022), as well as in the educational process at the Department of Computing of the Vinnytsia National Technical University within the scope of teaching the disciplines «Computer Electronics», «Linear Integrated Circuits», «Analog-Digital Technology» (implementation act dated May 20, 2023).
