Department of Computer Science and Electrical Engineering
High power digital audio amplifier
(output stage)
Victor Frioni
Abstract:
This thesis presents the output stage for a true digital audio amplifier. A digital
amplifier performs amplification of the signal directly from the CD. This offers
the advantage of the entire input chain remaining in the digital domain, and reducing
the production of noise. To show this concept working, a digitally produced PWM
signal of a sine wave has been used to test the output stage constructed in this
thesis. The output stage was designed using a full-bridge set of n-channel high
power MOSFETs. A pulse referenced error correction (PEDEC) feedback network has
been introduced that offers a simple solution to removing the inevitable errors
introduced by the power stage. An output stage was built without feedback and
tested. Results show the potential for high efficiency, but to realise high fidelity
a feedback network will need to be deployed. Current technology and concepts exist
that will allow the construction of a commercially viable digital audio amplifier
in the near future.
Complete thesis:
thesis.pdf
Conference paper:
conference.pdf
Additional material:
code sch
pcb datasheets
About the Author
Dept of Computer Science and Electrical
Engineering / Victor Frioni
/ atilla@beer.com
last mod 15/10/99