# EXPT10 - There are only slight differences between the...

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Experiment 10: Inverting Op-Amp Circuit Procedure: 1) G = R5/10k 2) N/A 3) N/A 4) N/A 5) R = 19.9k, 29.9k, 39.9k 6) Nothing Changed 7) G = -R5/10k = 19.9/10 = -1.99 29.9/10 = -2.99 39.9/10 = -3.99 8) (2-1.99)/1.99 * 100 = .5% (3-2.99)/2.99 * 100 = .334% (4-3.99)/3.99 * 100 = .251%

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For R = 19.9k Vi Vo 0 0 0.5 -1.012 1 -2.03 1.5 -3.01 2 -4.04 2.5 -5.09 3 -6.1 3.5 -7.04 4 -8.05 4.5 -8.05 5 -8.05 Op-Amp Gain (R = 19.9k) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 0 1 2 3 4 5 6 Vi Vo Series1 Linear Regression: G = 2.017 (2.017-2)/(2.017) * 100 = .843%
For R = 29.9k Vi Vo 0 0 0.5 -1.48 1 -2.96 1.5 -4.47 2 -5.98 2.5 -7.53 3 -8.06 3.5 -8.05 4 -8.05 4.5 -8.05 5 -8.06 Op-Amp Gain (R=29.9k) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 0 1 2 3 4 5 6 Vi Vo Series1 Linear Regression: G = 2.81 (3-2.81)/(2.81) * 100 = 6.2%

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For R = 39.9k Vi Vo 0 0 0.5 -1.98 1 -4.02 1.5 -6.01 2 -7.96 2.5 -8.05 3 -8.05 3.5 -8.05 4 -8.05 4.5 -8.05 5 -8.05 Op-Amp Gain (R=39.9k) -9 -8 -7 -6 -5 -4 -3 -2 -1 0 0 1 2 3 4 5 6 Vi Vo Series1 Linear Regression: G=3.99 (4-3.99)/3.99 * 100 = .251% 17) Yes, my experimental results do confirm the equation I found in step 1.
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Unformatted text preview: There are only slight differences between the experimental and expected values, and those differences are attributed to the difficulty in adjusting the trim pots to exactly obtain the desired voltage values. 20) The saturation voltage for this particular op-amp is said to be around 8V. Based on my measured values, it is clear that the op-amp became saturated right around 8V. Final Thoughts/Comments: This lab was rather tedious, but not particularly difficult. It was easy to know what values my experiments were meant to obtain, which made it easy to tell when I was doing something wrong. This lab took me about an hour and a half to complete. All in all, this lab was not bad but a little too repetitive and tedious....
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## This lab report was uploaded on 03/30/2008 for the course ECE 2074 taught by Professor Stilwell during the Spring '08 term at Virginia Tech.

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EXPT10 - There are only slight differences between the...

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