Class-D Garage Band Amplifier Team: Aaron Danielson, Robert Mann, Randall Newcomb, Scott Russell Sponsor: Nigel Thompson Advisor: Dr. William Harrison

Overview The Purpose of the Class-D Garage Band Amplifier Requirements and Stretch Goals System Concept System Block Diagram Sampling and Bitrate Constraints Task Breakdown Budget Project Schedule 2

Purpose 1.Class D Amplifier Power Efficiency 2.Price Point 3.Customizability 4.Open Source 3

Purpose: Power Efficiency 4

Purpose: Price Point 5

Purpose: Customizability 6

Budget 7

8

Requirements An amplifier output will be driven by an FPGA The output stage will be a PWM H-bridge amplifier High quality audio Low cost High efficiency Analog Input Output of more than 100W 4-Layer PCB 9

Stretch Goals An enclosure will be constructed to house the amplifier, FPGA and speaker An alternate amplifier will be implemented Digital Input PWM Analog In Digital In PSU Stretch Goal Required 10

System Concept Images from Google Image Pre-Filter 11

System Block Diagram - FPGA 12

System Block Diagram - Output 13

Description of Major Tasks Design a Top Level Testbench Contains all the modules for testing that will be synthesized onto the FPGA. Instantiate Pacoblaze uP and write necessary assembly in test environment to reduce synthesize time later. Digital Signal Processor Design 2 filters – one each for bass & treble. Interface with state machine to allow user to adjust settings. Hardware State Machine Implement a menu system to control all the systems. Integrate the uP communication with the state machine for user feedback through the LCD and buttons Amplifier Produce a breakout board for initial testing Layout custom PCB Implement final design and test the output stage Speaker Enclosure Build the enclosure Design bandpass filters for the selected speaker 14

ADC -> DSP -> DAC 15

Project Schedule 16

Conclusion Goal Ahead of schedule on the Gantt chart Purchasing is slightly delayed because we’re waiting for budget approval 17