We discuss the DSP design and implementation of a digital audio power amplifier using a FPGA. We concentrate on the sigma-delta modulator and associated bit-flipping architecture which is used to convert an oversampled PCM input signal into a 1'-bit code suitable for controlling a power switch. We discuss details of FPGA architecture and the optimizations required for implementation.

Authors: Magrath, Anthony J.; Clark, I. G.; Sandler, Mark B.
Affiliation: King's College London, Strand, London, UK
AES Convention: 103 (September 1997) Paper Number: 4603
Publication Date: September 1, 1997
Subject: Amplifiers and Attenuators

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