DC Servos and Digitally-Controlled Microphone Preamplifiers

Hebert G. DC Servos and Digitally-Controlled Microphone Preamplifiers. In: AES Convention 137. Audio Engineering Society; 2014. Paper 9198. Available from: https://aes.org/publications/elibrary-page/?id=17521

@inproceedings{Hebert2014_17521,
  author = {Hebert, Gary},
  title = {{DC Servos and Digitally-Controlled Microphone Preamplifiers}},
  booktitle = {AES Convention 137},
  note = {Paper 9198},
  year = {2014},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=17521}
}

TY  - CPAPER
TI  - DC Servos and Digitally-Controlled Microphone Preamplifiers
AU  - Hebert, Gary
T2  - AES Convention 137
M1  - Paper 9198
PY  - 2014
DA  - 2014/10/06
UR  - https://aes.org/publications/elibrary-page/?id=17521
PB  - Audio Engineering Society
LA  - en
AB  - Microphone preamplifiers for professional audio applications require a very wide range of gain and low noise in order to provide a high-quality interface with the vast number of available microphones. In many modern systems the preamplifier gain is controlled indirectly via a digital interface in discrete steps. Often dc servo amplifiers are employed as a means of keeping the dc gain fixed to avoid large changes in output offset voltage while the audio band gain is varied. The resulting highpass filter response varies substantially as a function of the preamplifier gain. We investigate the frequency and time-domain effects of this. We also investigate several approaches to minimize these effects.
ER  -