Primerjava modulacijskih shem za ojačevalnike zvoka razreda D

Peršolja, Luka (author), Pirc, Matija (mentor)

Pri izdelavi ojačevalnika razreda D smo najprej soočeni z izbiro modulacijske sheme. V diplomskem delu smo zato v programu LTSpice zgradili simulacijske modele ojačevalnikov, ki uporabljajo tri različne modulacijske sheme. S pomočjo programov LTSpice in Matlab smo nato izvedli izračune harmonskega in intermodulacijskega popačenja za vsako topologijo. V začetnih poglavjih so podrobneje predstavljeni gradniki ojačevalnikov razreda D ter izbira komponent za simulacijo, prav tako so podrobneje predstavljene in analizirane uporabljene simulacijske sheme. Na podlagi dobljenih rezultatov in ostalih lastnosti pridobljenih iz literature smo dobili dober pregled nad prednostmi in slabostmi različnih modulacijskih shem, kar nam bo v prihodnje pomagalo pri izbiri najbolj primerne modulacijske sheme glede na željene lastnosti ojačevalnika.

• Language: Slovenian
• Keywords: modulacija, ojačevalnik, simulacija, razred D, PWM, PDM, THD, IMD
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FE - Faculty of Electrical Engineering
• Year: 2025
• PID: 20.500.12556/RUL-173648
• COBISS.SI-ID: 252101123
• Publication date in RUL: 19.09.2025

Secondary language

• Language: English
• Title: Comparison of modulation schemes used in class D audio amplifiers

Abstract

When designing a class D amplifier, we are first faced with choosing a modulation scheme. In this work we have built LTSpice simulation models utilizing three different modulation schemes, to aid with that decision. We then carried out calculations of harmonic and intermodulation distortion for each topology using LTSpice and Matlab. The introductory chapters present the different building blocks of class D amplifiers as well as how and why we chose the components for the simulation. Further chapters describe and analyze the different modulation schemes in use. Based on data gathered and other characteristics found in literature we have gained a good overview of the advantages and disadvantages of different modulation schemes. In the future this will aid us in choosing the most appropriate modulation scheme based on required amplifier characteristics.

• Keywords: modulation, amplifier, simulation, class D, PWM, PDM, THD, IMD, self-oscillating