PAPER SESSION 2: POWER STAGE TOPOLOGIES
2-2 Digital Audio Power Amplifier Based on Multilevel
Victor M. E. Antunes(1),
Vitor Fernao Pires(2), Jose Fernando Silva(3).
(1) Instituto Politécnico de Setúbal, Portugal.
(2) Instituto Superior Técnico (IST), UTL, Lisbon,
Portugal. (3) Centro Automática Universidade Técnica Lisboa
(CAUTL), Lisbon, Portugal.
The concepts and design aspects of all-digital openloop
audio power amplifiers, based on multilevel
power converters, are presented. Innovative modulation
techniques to reduce harmonic distortion of this
type of amplifiers are also presented. A prototype of a
digital multilevel audio power amplifier has been
developed, implemented, and tested. THD plus noise performance
comparisons between some class A, AB, and D
amplifiers are presented. Results show that the proposed
digital audio power amplifier can be a promising solution
for a high-quality digital audio power amplifier.