LAB 1 Analog eletronics

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Picture taken from the Oscilloscope based on the step number 6 of the lab 01.

[pic 21]

For this experiment we applied a 500mVpp (peek-to-peek) with a 1KHz sine wave on VI2 only, as we applied the VI1 to the ground.

The blue wave means the output and the yellow one is the input of our circuit.

Theory Comparison & Conclusion:

Theory

Measured

R1

1 k[pic 22]

983.66 [pic 23]

R2

10 k[pic 24]

9.869 k[pic 25]

R3

1 k[pic 26]

983 [pic 27]

R4

10 k[pic 28]

10.057 k[pic 29]

Table of the computed theoretical value for the common-mode gain from the equation (1) with our 4 measured values of the resistors. (Step 2)

Theory

Measured

Gain for the

Common Mode (Acm)

0V

17.628 mV/V or

0.017628

Table for the values for the Gain of the Common Mode for step 3

Theory

Measured

Gain for the

Common Mode

0V

30.081 mV or

0.030081

Table for the values for the gain obtained from the common mode on step 4

Theory

Measured

Gain for the

Common Mode

0V

8.81 mV/V or

0.00884

Table for the values for the theory and measured values of input and output.

Theory

Measured

Steps

VI1

VI2

Vo

VI1

VI2

Vo

3

500 mVpp

500 mVpp

0

492 mV

492 mV

14.8 mV

4

ground

500 mVpp

5 V

ground

500mV

4.96 V

From this experiments it is concluded that all the measured values are very close to the theoretical ones, so, the op amp could amplify the voltage as it was supposed to do. Through our experimentations we saw that the op 741 amp could not go higher than +15V nor lower than -15V.

Our recommendations for the next labs will be to use a more precise probe for the capture of the sine wave with the oscilloscope and have a better wiring system on our breadboard (more clean).

********Try to explain any differences between your experimental versus theoretical/simulated results.)********