Control Techniques for Audio Envelope Tracking

Bakker R, Duffy M. Control Techniques for Audio Envelope Tracking. In: AES Convention 146. Audio Engineering Society; 2019.pp. 507:1-4. Available from: https://aes.org/publications/elibrary-page/?id=20365

@inproceedings{Bakker2019_20365,
  author = {Bakker, Robert and Duffy, Maeve},
  title = {{Control Techniques for Audio Envelope Tracking}},
  booktitle = {AES Convention 146},
  pages = {507:1-4},
  url = {https://aes.org/publications/elibrary-page/?id=20365},
  year = {2019},
  month = mar,
  publisher = {Audio Engineering Society}
}

TY  - CPAPER
TI  - Control Techniques for Audio Envelope Tracking
AU  - Bakker, Robert
AU  - Duffy, Maeve
T2  - AES Convention 146
SP  - 1
EP  - 4
M1  - Paper 507
PY  - 2019
DA  - 2019/03/06
UR  - https://aes.org/publications/elibrary-page/?id=20365
PB  - Audio Engineering Society
LA  - en
AB  - One of the main applications for class-D audio amplifiers is portable or battery-operated devices such as Bluetooth speakers, smartphones, car stereos, etc. These devices often use a boost converter to increase the battery voltage to a suitable level to achieve the desired power output. The use of envelope tracking (ET) has been shown to significantly improve the efficiency of a class-D audio amplifier, particularly at lower power levels. However, modulating a boost converter to provide envelope tracking at a high bandwidth is complicated due to the right half-plane zero in its transfer function. This paper discusses the effect of envelope bandwidth on the overall system performance, and how it affects the control of the boost converter. It also discusses the different control methods for boost converters, and variations of this type of DC/DC converter.
ER  -