Signal Detection and How to Build an Audio Amplifier

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Presentation transcript:

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

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

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

Laws Ohm’s law - V=IR Kirchhoff’s Voltage Law/KVL P=VI Kirchhoff’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

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

Ideal Operational Amplifiers Infinite input resistance Zero input offset voltage I1 = 0 0V I2 = 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

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.

Questions and Answers