A fundamental problem in digitally controlled class-D power amplifiers is the distortion of the amplified pulse signal by imperfections of the power transistors and the analogue output circuitry. The only way to overcome this is to provide error correction by feedback. With a pulse-modulated signal (either PWM or Sigma-Delta-Modulation) this correction can be performed by changing the pulse edge timing, as it is done in some existing solutions. If error correction during the pulse generation inside of the digital system is desired, an Analogue- to Digital converter is needed. In this paper the most important solutions done so far are reviewed and further ideas based on feedback into the digital system are introduced.

Authors: Esslinger, Rolf; Gruhler, Gerhard; Stewart, R. W.
Affiliations: Dept. of Microengineering, University of Applied Sciences, Heilbronn, Germany ; Signal Processing Division, Dept. of Electronic and Electrical Engineering, Glasgow, Scotland, UK(See document for exact affiliation information.)
AES Convention: 114 (March 2003) Paper Number: 5828
Publication Date: March 1, 2003
Subject: Signal Processing

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