Performance of a pure digital audio amplifier using pulse width modulation (PWM) highly depends on suppression of high frequency, inaudible, components in its spectrum. Noise-like phase modulation of PWM carrier signal allows reducing of nonlinear effects in demodulation filter, and can be of advantage for EMC reasons. In this paper we propose a method of digital PWM amplifier implementation where a digital chaotic oscillator is used for carrier spreading. Modulation principle, interval modulator schematic, and chaotic oscillator structure as well as experimental results are presented.

Author: Shimanskiy, Vladislav
Affiliation: Samsung Electronics
AES Conference: 29th International Conference: Audio for Mobile and Handheld Devices (September 2006)
Paper Number: 2-1
Publication Date: September 1, 2006
Subject: Audio for Mobile & Handheld Devices

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