Kakvoća izlaznih audio pojačala snage

scientific master's theses

• Title (english): Quality of the audio power amplifiers
• Author: Ivan Đurek
• Mentor: Branko Somek (mentor)
• Committee member: Branko Somek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Electroacoustics); Zagreb
• Defense date and country: 2000, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U radnji je analizirana kvaliteta različitih klasa audio pojačala (A, AB, B, D, G, H). Analizirane su karakteristike koje određuju kvalitetu: frekvencijska karakteristika, odnos signal-smetnja, dinamika, brzina promjene signala, harmonička i intermodulacijska izobličenja, korisnost itd. Budući da su današnja audio pojačala analogni dio digitalnog elektroakustičkog sustava, njihove karakteristike potrebno je što više približiti karakteristikama digitalnih uređaja. Obrađeni su osnovni dijelovi modernih audio pojačala, a veća je pažnja posvećena izlaznom stupnju koji određuje klasu pojačala. Provedena je analiza frekvencijske i temperaturne stabilnosti pojačala, kao i odabir napajanja. Uz teoretski dio konstruirano je i izvedeno pojačalo na kojem su izvršena potrebna mjerenja.

Abstract (english)

The quality of the different output stage's classes were analyzed (A, AB, B, D, G, H). Different characteristics were analyzed: frequency transfer function, signal to noise ratio, dynamics, slew rate, harmonic and intermodulation distortion, efficiency, etc. Because modern power amplifiers are part of digital electroacoustical system, their characteristics must be as close as possible to the characteristics of the digital parts. Basic parts of modern audio amplifiers were analyzed, with bigger attention to the output stages, which define classes of the amplifiers. Frequency and temperature stability were analyzed, and also different power supplies. Measurements were made at class B amplifier that was constructed and built, according to the theoretical analysis.

• Keywords: Pojačalo snage; klase pojačala; tri stupnja; korisnost; stabilnost; izobličenja
• Keywords (english): Power amplifier; classes; three stages; efficiency; stability; distortion
• Language: croatian
• URN:NBN: urn:nbn:hr:168:759374
• Study programme: Title: Postgraduate master programme in electrical engineering; Study programme type: university; Study level: postgraduate; Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2019-04-03 13:02:22