David Grant wrote:
I'm designing/constructing a 100W Class-D Power amp for my final year ECE
design project. I've done some looking through NGs, google and the campus
library for research material, but haven't found any very recent
information. Have there been any major advances in the past two years for
Class-D amps? If so are they documented anywhere?

Yes, there have been lots and lots of AES presentations and papers.

Johan Gaboriau, Xiofan Fei and Eric Wallburger from Cirrus Logic.
High Performance PWM Power Audio Amplifier. AES preprint 5428 (2001).

All of the Zetex data sheets.

Frank Christensen, et al, PSCPWM-Based Switching Audio Power Amplifiers.
Preprint #5040 (1999).

Michael Score, Donald Dapkus, and Timothy Darling from TI, Class D Amplifiers:
System Considerations. Preprint #5041 (1999)

Karsten Nielsen and Lars Fenger from B&O.
The Active pulse modulated Transducer, A novel audio power conversion system
architecture. Preprint 5866 (2004).

Steven Harris, Jack Anderson, and Daniel Cheng of D2Audio. Intelligent Class
D Amplifier Controller Integrated Circuit as an Ingredient Technology for
Multi-Channel Amplifier Modules of Greater than 50Watts/Channel. Preprint 5947.

This is by no means complete... this is just a five-minute search through
the AES preprints from the past few shows that I decided to keep. There
are probably a dozen or so more Class D papers that I decided not to keep.
This is a really, really hot field right now because everybody is wanting
higher and higher efficiency amplifiers for battery-powered devices.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."