1 Signal Detection and How to Build an Audio AmplifierRebecca Laughon YSP Student CURENT Young Scholars Program 18 July 2016 Min H. Kao Building, University of Tennessee

2 Agenda Signal Detection Overview Audio Signal Dilemma/SolutionPreliminaries Amplifier Design and Simulation Amplifier Prototype

3 Examples of Signal Detection

4 Agenda Signal Detection Overview Audio Signal Dilemma/SolutionPreliminaries Amplifier Design and Simulation Amplifier Prototype

5 Audio Detection Dilemma

6 Proposed Solution Amplifier

7 40 mVmax Electrical SignalVoice Microphone Audio Signal 40 mVmax Electrical Signal Amplifier Amplified Electrical Signal Gain ≈ 70 Speaker Power output =1Watt

8 Agenda Signal Detection Overview Audio Signal Dilemma/SolutionPreliminaries Amplifier Design and Simulation Amplifier Prototype

9 Laws Ohm’s law - V=IR Kirchhoff’s Voltage Law/KVL P=VIKirchhoff’s Current Law/KCL Ohm’s law - V=IR P=VI Energy E Joule Power P Watt – 1W = 1J/S Charge Q Coulomb Current I Ampere – 1A = 1Q/S Voltage V Volt – 1V = 1J/Q Resistance R Ohm

10 Resistors Resistance - R =Series resistors - Rtotal = R1 + R2 + R3. . . Parallel resistors - Rtotal =

11 Ideal Operational AmplifiersInfinite input resistance Zero input offset voltage I1 = 0 0V I2 = 0

12 Inverting Amplifiers Gain = Gain of this amplifier = -10

13 Agenda Signal Detection Overview Audio Signal Dilemma/SolutionPreliminaries Amplifier Design and Simulation Amplifier Prototype

14 Amplifier Design

15 Circuit Simulation Results

16 Agenda Signal Detection Overview Audio Signal Dilemma/SolutionPreliminaries Amplifier Design and Simulation Amplifier Prototype

17

18 Acknowledgements This work was supported primarily by the ERC Program of the National Science Foundation and DOE under NSF Award Number EEC Other US government and industrial sponsors of CURENT research are also gratefully acknowledged.

19 Questions and Answers