Suppression of Switch Mode Power Supply Noise in Digital Microphones

Johansson M, Almeflo PO. Suppression of Switch Mode Power Supply Noise in Digital Microphones. In: AES Convention 110. Audio Engineering Society; 2001. Paper 5341. Available from: https://aes.org/publications/elibrary-page/?id=9914

@inproceedings{Johansson2001_9914,
  author = {Johansson, Magnus and Almeflo, Per Ove},
  title = {{Suppression of Switch Mode Power Supply Noise in Digital Microphones}},
  booktitle = {AES Convention 110},
  note = {Paper 5341},
  year = {2001},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=9914}
}

TY  - CPAPER
TI  - Suppression of Switch Mode Power Supply Noise in Digital Microphones
AU  - Johansson, Magnus
AU  - Almeflo, Per Ove
T2  - AES Convention 110
M1  - Paper 5341
PY  - 2001
DA  - 2001/05/06
UR  - https://aes.org/publications/elibrary-page/?id=9914
PB  - Audio Engineering Society
LA  - en
AB  - A digital microphone has a high power consumption compared to an analog. This will result in a higher working temperature, especially if traditional linear regulators are used in the microphone power supply circuitry. For a better degree of power efficiency, a switch mode power supply can be used instead. A switch mode power supply will however add noise. If the pulse width modulator is synchronised to the analog-to-digital converter sample rate clock, the switch mode power supply noise decreases by elimination of the alias frequencies.
ER  -