Engr 1172-8002 Lab #7

# Engr 1172-8002 Lab #7 - Experiment #7 Signal Amplification...

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Experiment #7 Signal Amplification and the Operational Amplifier Engr 1172-8002 Professor Dweik November 11, 2009 Group Lab Report: Whitney Almond Robert Aguilar Jorge Ernesto

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Objective: The goal of Experiment #7 is to investigate how amplifiers increase the power of an electrical signal. In this experiment, we will study a simple operational amplifier and use it to amplify a sinusoidal signal. Amplifiers increase signal strength due to the power that they utilize from an external source, unlike the circuit elements we have studied so far (resistor, capacitor, inductor). This experiment concentrates on the performance of an operational amplifier, and how it can be used to magnify sinusoidal AC signals. Part 1) Operational Amplifier #1 (Gain=20) 1.1) Circuit Diagram for Operation Amplifier #1 1.2) Measurements for Operation Amplifier #1 Operational Amplifier #1 Measured Values 1K input resistor (R i ) 987 Resistance 20K feedback resistor(R f ) 19,999 Resistance Input AC signal (p-p) (V i ) 5.520V Amplifier Output Voltage (p-p) (V o ) 10.3V Operational Amp Gain (V 0 /V i ) (measured/calculated) 19.81/19.81 1.3) Statement of Results for Operational Amplifier #1
In part one, we needed a gain of 20. Since we know that gain is equal to the resistance value of the feedback divided by the input, we found the resistors needed to achieve this gain, 1K input and 20K feedback which were measured to be 987 (input= R i ) and 19,990 (feedback= R f ). We then measured the input AC signal (V i ) and the amplifier output voltage (V 0 ). For the input AC signal (V i ) we measured 0.520V and for the amplifier output voltage (V 0 ) we measured 10.3V. Using our measured values for input AC signal (V i ) and the amplifier output voltage (V 0 ) we calculated the gain of our operation amplifier by using the equation ‘for the gain of an operational amplifier (K)’ (see equations listed below). We calculated the gain again, but

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## This note was uploaded on 04/11/2010 for the course ENGR 1172 taught by Professor Dweik during the Spring '10 term at Dallas.

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Engr 1172-8002 Lab #7 - Experiment #7 Signal Amplification...

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