Transconductance Power Amplifier Systems for Current-Driven Loudspeakers

Mills PG, Hawksford MJ. Transconductance Power Amplifier Systems for Current-Driven Loudspeakers. J Audio Eng Soc. 1989;37(10):809-822. Available from: https://aes.org/publications/elibrary-page/?id=6066

@article{Mills1989_6066,
  author = {Mills, Paul G. and Hawksford, Malcolm J.},
  title = {{Transconductance Power Amplifier Systems for Current-Driven Loudspeakers}},
  journal = {Journal of the Audio Engineering Society},
  volume = {37},
  number = {10},
  pages = {809--822},
  year = {1989},
  month = oct,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=6066}
}

TY  - JOUR
TI  - Transconductance Power Amplifier Systems for Current-Driven Loudspeakers
AU  - Mills, Paul G.
AU  - Hawksford, Malcolm J.
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 37
IS  - 10
SP  - 809
EP  - 822
PY  - 1989
DA  - 1989/10/06
UR  - https://aes.org/publications/elibrary-page/?id=6066
PB  - Audio Engineering Society
LA  - en
AB  - Moving-coil loudspeakers generally provide a substantial improvement in linearity when current driven, together with the elimination of voice-coil heating effects. Consequently there is a need to investigate low-distortion power amplifier topologies suitable for this purpose. After considering established current feedback approaches, a novel method using a common-base isolation stage is outlined and extended to show a prototype amplifier circuit in detail. In addition, the elements of a two-way active current-driven system are described, with low-frequency velocity feedback control derived from a sensing coil. The coupling error between this coil and the main driving coil is nulled by electronic compensation.
ER  -