Real-Time Power Supply Compensation for Noise-Shaped Class D Amplifier

Boudreaux R, Gaboriau J, Hagge M, Melanson J, Zhang L. Real-Time Power Supply Compensation for Noise-Shaped Class D Amplifier. In: AES Convention 117. Audio Engineering Society; 2004. Paper 6302. Available from: https://aes.org/publications/elibrary-page/?id=12959

@inproceedings{Boudreaux2004_12959,
  author = {Boudreaux, Randy and Gaboriau, Johann and Hagge, Mel and Melanson, John and Zhang, Lingli},
  title = {{Real-Time Power Supply Compensation for Noise-Shaped Class D Amplifier}},
  booktitle = {AES Convention 117},
  note = {Paper 6302},
  year = {2004},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=12959}
}

TY  - CPAPER
TI  - Real-Time Power Supply Compensation for Noise-Shaped Class D Amplifier
AU  - Boudreaux, Randy
AU  - Gaboriau, Johann
AU  - Hagge, Mel
AU  - Melanson, John
AU  - Zhang, Lingli
T2  - AES Convention 117
M1  - Paper 6302
PY  - 2004
DA  - 2004/10/06
UR  - https://aes.org/publications/elibrary-page/?id=12959
PB  - Audio Engineering Society
LA  - en
AB  - This paper presents a pure digital real-time power supply compensation scheme for both single-ended and bridgetied-load configured noise-shaped class D amplifiers. Using the appropriate power supply measurement circuitry, the scaled AC and DC components of the power supply voltage rail(s) are fed back into the PWM controller to modify the feedback path and the direct path of the noise shaper. All delays through the feedback loop have been minimized such that the ripple cancellation of the output stage is accomplished in real time. A two-chip ADC/PWM controller with this compensation scheme achieves 40dB power supply rejection of a 60Hz ripple and 100dB system dynamic range.
ER  -