PWM Amplifier Control Loops with Minimum Aliasing Distortion

Neesgaard C, Risbo L. PWM Amplifier Control Loops with Minimum Aliasing Distortion. In: AES Convention 120. Audio Engineering Society; 2006. Paper 6693. Available from: https://aes.org/publications/elibrary-page/?id=13497

@inproceedings{Neesgaard2006_13497,
  author = {Neesgaard, Claus and Risbo, Lars},
  title = {{PWM Amplifier Control Loops with Minimum Aliasing Distortion}},
  booktitle = {AES Convention 120},
  note = {Paper 6693},
  year = {2006},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=13497}
}

TY  - CPAPER
TI  - PWM Amplifier Control Loops with Minimum Aliasing Distortion
AU  - Neesgaard, Claus
AU  - Risbo, Lars
T2  - AES Convention 120
M1  - Paper 6693
PY  - 2006
DA  - 2006/05/06
UR  - https://aes.org/publications/elibrary-page/?id=13497
PB  - Audio Engineering Society
LA  - en
AB  - PWM class-D audio power amplifiers contain typically a control loop filter network and a comparator producing the PWM signal. The comparator performs a sampling operation whenever it changes state. A previous paper by the author analyzed this sampling behavior from a small signal point of view. The present paper attempts to formulate a large-signal model that accounts for the non-linear effects of the sampling due to aliasing of high frequency carrier components. The model is validated using simulations and a class of loop filters is presented that obtains minimum aliasing distortion thanks to the use of quadrature sampling. Finally, measurement data are presented for real applications using the principles described.
ER  -