Abstract
Class D audio amplifiers have gained significant influence in sound reproduction due to their high efficiency.
One of the most commonly used control methods in these amplifiers is self-oscillation. A parameter of key
interest in self-oscillating amplifiers is the switching frequency, which is known for its variation. Knowledge
of switching frequency variations is of great importance with respect to electromagnetic interference (EMI).
This paper will investigate, whether the switching frequency is depended on modulation index and audio
reference frequency. Validation is done using simulations, and the results are compared with measurements
performed on a 50 W prototype amplifier. The switching frequency is tracked through accurate spectrum
measurements, and very good compliance with simulation results are observed.
Original language | English |
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Title of host publication | Proceedings of the 127th AES Convention |
Number of pages | 10 |
Publisher | AES |
Publication date | 2009 |
ISBN (Print) | 978-0-937803-71-4 |
Publication status | Published - 2009 |
Event | 127th AES Convention - New York, NY, United States Duration: 9 Oct 2009 → 12 Oct 2009 Conference number: 127 http://www.aes.org/events/127/ |
Conference
Conference | 127th AES Convention |
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Number | 127 |
Country/Territory | United States |
City | New York, NY |
Period | 09/10/2009 → 12/10/2009 |
Internet address |