1. 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

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

3. Examples of Signal Detection

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

5. Audio Detection Dilemma

6. Proposed Solution
Amplifier

7. 40 mVmax Electrical Signal
Voice
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/Solution
Preliminaries
Amplifier Design and Simulation
Amplifier Prototype

9. 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

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

11. Ideal Operational Amplifiers
Infinite 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/Solution
Preliminaries
Amplifier Design and Simulation
Amplifier Prototype

14. Amplifier Design

15. Circuit Simulation Results

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

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