A digital power amplifier topology is proposed optimized specifically for use with DSD-type data streams. The configuration enables direct interfacing of DSD data with no requirement for intermediate signal processing or analogue-to-digital conversion. The output architecture exploits a classic H-bridge configuration and uses a novel form of ac data coupling to simplify internal interface circuitry. Wide range gain control is enabled through modulation of the output-stage power supply voltage that also improves power efficiency at low gain settings. Consideration is given to finite pulse rise time and a modified DSD data format is investigated.

Authors: Hawksford, Malcolm J.; Prime, Francis M.
Affiliations: KEF Audio, Maidstone, Kent, UK ; University of Essex, Colchester, Essex, UK(See document for exact affiliation information.)
AES Convention: 117 (October 2004) Paper Number: 6303
Publication Date: October 1, 2004
Subject: Signal Processing

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