1. Amplifier Design and Modeling Doug Bouler: CURENT REU Dr. Daniel Costinett: Mentor Final CURENT Presentation 7/18/2014 Knoxville, TN

2. Outline 2 1. Research goals 2. Process Class A Amplification Class AB Amplification Model and Transfer Characteristic 3. Results 4. Future Work

3. Research Goals 3 Design and Model a Class AB amplifier using LT-spice and MATLAB Make Class AB amplifier capable of amplifying an audio signal Test Magnitude and Phase Response

4. Class A Amplifiers 4 V gate-source = V rail x (R2 / R1 + R2)R 1 /R 2 = (V rail - V gs ) / V gs Input Signal Voltage Rail Output Signal Vgs

5. Class A Amplifiers 5 Data of DC Analysis from 0V to 3V DC to find midpoint of slope Optimal V gs Input Signal Output Signal V GS V DD Cutoff Region

6. Class A Amplifiers 6 V gate-source = V rail x (R2 / R1 + R2) Voltage Loss

7. Class AB Amplifiers 7 Class A Class AB Matching Transistors

8. Class AB Amplifiers 8 Matching Transistors Class B Output StageClass AB Output Stage

9. Modeling Process 9 Collect Data from Output of Amplifier Stage Normalize Data in MATLAB Graph Input and Output Voltage Response Develop Transfer Characteristic Model Audio Response

10. Results 10 This figure shows the frequencies at which the magnitude of the output signal begins to attenuate 4000 Hz

11. Results 11 η = P out / P in = 44.64% A = V out / V in = 40 V/V

12. Future Work 12 Research methods of Wireless Power Transfer (WPT) Research Specific Absorption Rates (SAR) of WPT for Biomedical applications Use knowledge gained from this project to begin designing devices capable of WPT

13. “This work was supported primarily by the Engineering Research Center Program of the National Science Foundation and the Department of Energy under NSF Award Number EEC-1041877 and the CURENT Industry Partnership Program. " 13 Acknowledgements