Title :
A simple class-D audio power amplifier using a passive CT ΣΔ modulator for medium quality sound systems
Author :
de Melo, Joao L. A. ; Leitao, Pedro V. ; Goes, Joao ; Paulino, Nuno
Author_Institution :
CTS/UNINOVA, Caparica, Portugal
Abstract :
This paper presents a class-D power amplifier for medium quality sound systems using a second-order passive sigma-delta modulator (ΣΔM). The ΣΔM controls an output power stage consisting of a H-bridge. The loop filter of the ΣΔM was designed using a optimization procedure based on genetic algorithm (GA), that takes into account several parameters. This system was implemented using discrete components and the experimental results show that a DR of 75 dB is achieved with a peak signal-to-noise-plus-distortion ratio (SNDR) of 54 dB.
Keywords :
audio-frequency amplifiers; bridge circuits; genetic algorithms; power amplifiers; sigma-delta modulation; H-bridge circuit; class-D audio power amplifier; class-D power amplifier; discrete components; genetic algorithm; medium quality sound systems; output power stage; passive CT sigma-delta modulator; second order passive sigma-delta modulator; Distortion; Gain; Genetic algorithms; Modulation; Optimization; Power generation; Power supplies; Class-D; audio; sigma-delta;
Conference_Titel :
Mixed Design of Integrated Circuits & Systems (MIXDES), 2015 22nd International Conference
Conference_Location :
Torun
Print_ISBN :
978-8-3635-7806-0
DOI :
10.1109/MIXDES.2015.7208582
