Digital PWM Amplifier Using Nonlinear Feedback and Predistortion

Craven P, Hand L, Attwood B, Andersen J. Digital PWM Amplifier Using Nonlinear Feedback and Predistortion. In: AES Convention 128. Audio Engineering Society; 2010. Paper 8129. Available from: https://aes.org/publications/elibrary-page/?id=15426

@inproceedings{Craven2010_15426,
  author = {Craven, Peter and Hand, Larry and Attwood, Brian and Andersen, Jack},
  title = {{Digital PWM Amplifier Using Nonlinear Feedback and Predistortion}},
  booktitle = {AES Convention 128},
  note = {Paper 8129},
  year = {2010},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=15426}
}

TY  - CPAPER
TI  - Digital PWM Amplifier Using Nonlinear Feedback and Predistortion
AU  - Craven, Peter
AU  - Hand, Larry
AU  - Attwood, Brian
AU  - Andersen, Jack
T2  - AES Convention 128
M1  - Paper 8129
PY  - 2010
DA  - 2010/05/06
UR  - https://aes.org/publications/elibrary-page/?id=15426
PB  - Audio Engineering Society
LA  - en
AB  - A nonlinear feedback topology is used to reduce the deviations of a practical PWM output stage from ideal theoretical behaviour, the theoretical nonlinearity of the PWM process being corrected using predistortion. As the final output is analogue, an ADC is needed if the feedback is to be digital, and several problems arise from the practical limitations of commercially-available ADCs, including delay and addition of ultrasonic noise. We show how these problems can be minimised, and illustrate the performance of a digital PWM amplifier in which feedback results in a significant reduction of distortion throughout the audio range.
ER  -