Title :
Class-D audio amplifiers in mobile applications
Author_Institution :
NXP Semicond., Nijmegen, Netherlands
Abstract :
A comparative system-level overview is given of alternative class-D amplifier architectures. The theory behind pulse-width modulation and different modulation schemes is discussed. Topological alternatives such as open-loop versus feedback, fixed-carrier versus self-oscillating are analyzed and compared in terms of relevant characteristics such as distortion, power supply rejection, efficiency and electro-magnetic interference. The combination of D/A conversion and class-D amplifiers is discussed.
Keywords :
audio-frequency amplifiers; digital-analogue conversion; electromagnetic interference; mobile radio; pulse width modulation; D/A conversion; class-D audio amplifier; electromagnetic interference; fixed-carrier versus self-oscillating; mobile application; open-loop versus feedback; power supply rejection; pulse-width modulation; Batteries; CMOS technology; Frequency; High power amplifiers; Power amplifiers; Power generation; Pulse amplifiers; Pulse width modulation; Radiofrequency amplifiers; Switches;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5117969
