Design and research on Sigma-Delta digital-to-analog converters for audio power amplifiers

Vytenis Puidokas

Doctoral dissertation

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Technological sciences, electrical and electronic engineering (01T).

The dissertation investigates the issues of analyzing a digital Sigma-Delta digital-to-analog converter (DAC) for audio power (AP) amplifiers. The main objects of research include a digital Sigma-Delta AP DAC, improvement of its structure and an experimental research. The primary purpose of the dissertation is to suggest methods for improvement the structure of digital Sigma-Delta audio power DAC interpolator and the converter analysis.

The dissertation consists of four parts including Introduction, 4 chapters, Conclusions, References and the author‘s publications related to the subject of the dissertation.

The introduction reveals the investigated problem, importance of the thesis and the object of research and describes the purpose and tasks of the work, research methods, scientific novelty, the practical significance of results examined in the paper and defended statements. The introduction ends with the presentation of the author’s publications on the subject of the defended dissertation, offering the material of presentations made at conferences and defining the structure of the dissertation.

Chapter 1 is intended for comparative analysis of the structure of Sigma-Delta audio power DAC, assessment of properties and formulation of the tasks of the dissertation.

Chapter 2 contains the analysis of digital Sigma-Delta audio power DAC interpolator structures, mathematic models and analysis of simulation results.

Chapter 3 contains analysis of methods for evaluation of interchannel separation of a Sigma-Delta audio power DAC in the case of nonlinear crosstalk in the passive channel. Experimental examples of root mean square spectra are provided and nonlinear distortions emerging in the channel stimulated at that time are described; methods for evaluation of crosstalk are discussed.

Chapter 4 describes a method suggested for testing a Sigma-Delta audio power DAC intermodulation distortions using modified Twin-T filters. Results of simulation of frequency response characteristics and results of experimental research are analyzed; simplified alternative options of analysis are provided.

8 scientific articles related to the subject of the dissertation have been published: 6 of them – in the Thomson Reuters (ISI) Web of Knowledge register; 1 – in the Index Copernicus (IC) register and 1 – reviewed national conference proceedings. Results of research conducted on the dissertation subject have been reported at seven scientific conferences (2 of them were national and 5 – international level).

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Imprint No:
160×230 mm
116 p.
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