Signal Detection and How to Build an Audio

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

Agenda • Signal Detection Overview • Audio Signal Dilemma/Solution • Preliminaries • Amplifier Design and Simulation • Amplifier Prototype

Examples of Signal Detection

Agenda • Signal Detection Overview • Audio Signal Dilemma/Solution • Preliminaries • Amplifier Design and Simulation • Amplifier Prototype

Audio Detection Dilemma

Proposed Solution Amplifier

Voice Audio Signal 40 m. Vmax Electrical Signal Amplifier Amplified Electrical Signal Gain ≈ 70 Speaker Power output =1 Watt Microphone

Agenda • Signal Detection Overview • Audio Signal Dilemma/Solution • Preliminaries • Amplifier Design and Simulation • Amplifier Prototype

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

Resistors Resistance - R = Series resistors - Rtotal = R 1 + R 2 + R 3. . . Parallel resistors - Rtotal =

Ideal Operational Amplifiers • Infinite input resistance • Zero input offset voltage I 1 = 0 0 V I 2 = 0

Inverting Amplifiers Gain = Gain of this amplifier = -10

Agenda • Signal Detection Overview • Audio Signal Dilemma/Solution • Preliminaries • Amplifier Design and Simulation • Amplifier Prototype

Amplifier Design

Circuit Simulation Results

Agenda • Signal Detection Overview • Audio Signal Dilemma/Solution • Preliminaries • Amplifier Design and Simulation • Amplifier Prototype

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Acknowledgements This work was supported primarily by the ERC Program of the National Science Foundation and DOE under NSF Award Number EEC-1041877. Other US government and industrial sponsors of CURENT research are also gratefully acknowledged. 18

Questions and Answers 19