Feedback strategies in digitally controlled class-D amplifiers

R. Esslinger, G. Gruhler, R.W. Stewart

Research output: Contribution to conferencePaper


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.

Original languageEnglish
Publication statusPublished - Mar 2003
Event2003 AES Convention 114 - , United Kingdom
Duration: 1 Mar 2003 → …


Conference2003 AES Convention 114
CountryUnited Kingdom
Period1/03/03 → …



  • feedback strategies
  • digitally controlled
  • class-d amplifiers

Cite this

Esslinger, R., Gruhler, G., & Stewart, R. W. (2003). Feedback strategies in digitally controlled class-D amplifiers. 5828. Paper presented at 2003 AES Convention 114, United Kingdom.