An Asynchronous Switching High-end Power Amplifier

van der Hulst P, Veltman A, Groenenberg R. An Asynchronous Switching High-end Power Amplifier. In: AES Convention 112. Audio Engineering Society; 2002. Paper 5503. Available from: https://aes.org/publications/elibrary-page/?id=11440

@inproceedings{vanderHulst2002_11440,
  author = {van der Hulst, Paul and Veltman, Andre and Groenenberg, Rene},
  title = {{An Asynchronous Switching High-end Power Amplifier}},
  booktitle = {AES Convention 112},
  note = {Paper 5503},
  year = {2002},
  month = apr,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=11440}
}

TY  - CPAPER
TI  - An Asynchronous Switching High-end Power Amplifier
AU  - van der Hulst, Paul
AU  - Veltman, Andre
AU  - Groenenberg, Rene
T2  - AES Convention 112
M1  - Paper 5503
PY  - 2002
DA  - 2002/04/06
UR  - https://aes.org/publications/elibrary-page/?id=11440
PB  - Audio Engineering Society
LA  - en
AB  - Switching power amplifiers need an analogue low-pass filter between the power transistors and the speaker to prevent HF switching noise to enter the speaker. Cancellation of the non-linearities, as well as the (load dependent) frequency transfer of this filter is desired, but traditionally very difficult because of stability problems with filter-output feedback. A switching power amplification topology is presented which offers total control over the output filter dynamics and cancellation of the filter characteristics. The proposed amplifier uses a hysteresis circuit with a high-bandwidth capacitor-current feedback as PWM modulator. The output filter is thus an integral part of the modulator which dramatically improves control of the output. The result is a very high fidelity amplifier which is unconditionally stable, regardless of the load.
ER  -