CS-EE 481 Spring 2007 Sublimity Audio 1 February, 2007 University of Portland School of Engineering Project Sublimity Audio Stereo Class-D Audio Amplifier.

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Presentation transcript:

CS-EE 481 Spring 2007 Sublimity Audio 1 February, 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)

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

CS-EE 481 Spring 2007 Sublimity Audio 3 February, 2007 University of Portland School of Engineering Introduction Stereo input, 2.1 Output Switching rather than linear Using dsPIC to do DSP filtering Much more efficient than typical amplifiers

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

CS-EE 481 Spring 2007 Sublimity Audio 5 February, 2007 University of Portland School of Engineering Power Efficiency

CS-EE 481 Spring 2007 Sublimity Audio 6 February, 2007 University of Portland School of Engineering Scorecard Workspace secured in SD lab Design Review Approval Circuit Diagram and Ideal Simulation Completed Project Plan Completed

CS-EE 481 Spring 2007 Sublimity Audio 7 February, 2007 University of Portland School of Engineering Other accomplishments Some parts ordered and received Some building of circuits started Calculated critical component values –Used to select MOSFETs, Gate Drivers IRLIB4343, IRFI4212H-117P, IR2011 Found free full-version SPICE software –LTspice/SwitcherCAD III

CS-EE 481 Spring 2007 Sublimity Audio 8 February, 2007 University of Portland School of Engineering Plans Build and test individual units of project Filters (Pre and Output) DSP pic program and circuit (PWM generator) Power stage (gate drivers and FETs) Finish ordering parts Determine DSP pic frequency capabilities –May use alternate DSP on right/left channels TCA2002: 2-channel high-speed audio controller

CS-EE 481 Spring 2007 Sublimity Audio 9 February, 2007 University of Portland School of Engineering Plans continued…

CS-EE 481 Spring 2007 Sublimity Audio 10 February, 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 (10V to 14V) 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

CS-EE 481 Spring 2007 Sublimity Audio 11 February, 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 7Prototype Release04/13/07 8Founder’s Day04/16/07 9Final Report04/27/07 10Party with Stereo4/27/07

CS-EE 481 Spring 2007 Sublimity Audio 12 February, 2007 University of Portland School of Engineering Concerns/Issues Building high power circuits (soldering) Achieving DSP frequency > 300kHz –Use TCA2002 DSP for right/left channel Creating actual component SPICE models –Use alternate component netlist with similar specs Switching Noise –Design better filter

CS-EE 481 Spring 2007 Sublimity Audio 13 February, 2007 University of Portland School of Engineering Conclusions Getting ready to kick it into high gear Currently on schedule We are excited to build an amp so we can have our party in the spring. Does anyone have a question?