1. CS-EE 481 Spring 2007 Sublimity Audio 1 March, 2007 University of Portland School of Engineering Project Sublimity Audio Stereo Class-D Audio Amplifier Team Joe Baird Luke Raynor Aaron Taylor Advisor Dr. Osterberg Industry Representative Mike Desmith (Intel)

2. CS-EE 481 Spring 2007 Sublimity Audio 2 March, 2007 University of Portland School of Engineering Overview Introduction Scorecard Additional Accomplishments Plans Issues/Concerns Conclusions

3. CS-EE 481 Spring 2007 Sublimity Audio 3 March, 2007 University of Portland School of Engineering Introduction Stereo input, 2.1 Output Switching rather than linear Much more efficient than “conventional” class-AB amplifiers

4. CS-EE 481 Spring 2007 Sublimity Audio 4 March, 2007 University of Portland School of Engineering Introduction

5. CS-EE 481 Spring 2007 Sublimity Audio 5 March, 2007 University of Portland School of Engineering Classic Class AB Amp

6. CS-EE 481 Spring 2007 Sublimity Audio 6 March, 2007 University of Portland School of Engineering Simple Class-D Amp

7. CS-EE 481 Spring 2007 Sublimity Audio 7 March, 2007 University of Portland School of Engineering Commercial Class-D Amp Specifications VS Sublimity Audio Class-D Amp SpecificationAlpine MRP-M450 Value Sublimity Audio Value Power Requirements14.4V DC (11V to 16V)+ /- 12V DC for component power Variable power rails – Default to +/- 12V for left/right Ch, 24V for sub CH Efficiency80 % Input Sensitivity (For Rated Power): 0.2V to 4.0VN/A RMS Power (at 14.4V THD+N, 20Hz- 20kHz) Per channel into 4 ohms: 220W x 1 (1% THD)At 12V: 90W Total Per Right/Left Channel into 4 ohms: 18W Subwoofer Channel into 4 ohms: 54W Channels1 Channel (Mono) Operation2 Right/Left Channels 1 Subwoofer Channel Frequency Response20Hz - 200Hz (+3/-3dB)Right/Left Channel: 125Hz – 20kHz Subwoofer Channel: 20Hz – 150Hz Signal to Noise (S/N)90dBA (Reference to Rated Power)N/A Input Impedance10k OhmN/A

8. CS-EE 481 Spring 2007 Sublimity Audio 8 March, 2007 University of Portland School of Engineering Scorecard Left/Right Ch Gate Driver/FETs Completed Left/Right Ch Output Filter Completed Left/Right Ch Preamp (95%) Completed Left/Right Ch PWM Generator Completed Class-AB Comparison Amplifier Completed

9. CS-EE 481 Spring 2007 Sublimity Audio 9 March, 2007 University of Portland School of Engineering Full Class-D Schematic

10. CS-EE 481 Spring 2007 Sublimity Audio 10 March, 2007 University of Portland School of Engineering Left/Right Channel Demo without pre-filtering

11. CS-EE 481 Spring 2007 Sublimity Audio 11 March, 2007 University of Portland School of Engineering Plans Construct full-bridge sub channel Solder a single half-bridge channel to demonstrate EMI effects Construct a speaker box Measure amplifier parameters Update TOPs document

12. CS-EE 481 Spring 2007 Sublimity Audio 12 March, 2007 University of Portland School of Engineering Milestones NumberDescription Original 9/25/06 Previous 11/30/06 Present 1/30/06 1Product Approval10/22/06 2Plan Approval11/10/06 3Circuit Diagram12/1/06 4Design Release12/08/06 5TOP’s Approval02/23/07 6Unit Testing Completed3/23/07 04/10/07 7Prototype Release04/13/07 8Founder’s Day04/17/07 9Final Report04/27/07 10Party with Stereo4/27/07

13. CS-EE 481 Spring 2007 Sublimity Audio 13 March, 2007 University of Portland School of Engineering Concerns/Issues Building a nice speaker box Minimizing EMI as much as possible

14. CS-EE 481 Spring 2007 Sublimity Audio 14 March, 2007 University of Portland School of Engineering Conclusions Left/Right Ch Completed minus simple pre-filter Class-AB Comparison Amp Completed Solder a Separate Half-Bridge Channel In Process of Updating TOPs Biggest Enemy = EMI!!! Does anyone have a question?