W3 -Lab 3 Linear Op-Amp-OL 2023-06

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Jan 9, 2024

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Experiment 3: Linear Op-Amp circuits Objectives: After completing this experiment, you should be able to, 1. Observe the behavior of non-inverting, inverting and voltage follower circuits using Op-amps. 2. Calculate the output voltage and gain of these amplifiers. 3. Measure the output voltage and observe the phase relation between input and output signals. Submission Requirements: Submit the Multisim.ms14 file along with your Experiment 3 lab document. Components needed: Instruments used: 1. Resistors: 10kΩ, 1kΩ, 5.6kΩ, 1.5kΩ 1. Digital Multimeter (DMM) 2. Op-Amp: (1) LM741C 2. Oscilloscope 3. Capacitor: (2) 1 µ F Procedure: 1. The LM741C is 8-pin op-amp. The pinout is shown below. Observe there is a notch and a dot on the IC. The left side pin to the notch/dot is pin 1. Figure 1: LM741 Pinout and Breadboard placing

Non-Inverting Amplifier: 2. For the circuit shown in Figure 2 below, calculate the voltage gain of the non- inverting amplifier for all the combinations of resistor values shown in Table 2. Record the results in Table 2 below under calculated voltage gain (Av). Voltage gain ( AV ) ¿ 1 + Rf Rin 3. Calculate the output voltage of the amplifier and record the results in Table 2 under the calculated V OUT . V out = A V * V in 4. Construct the circuit shown in Figure 2 in MultiSim. Carefully observe the capacitor polarities. Pin 1 and 5 are not used. Pin 7 is positive 15V supply and Pin 4 is negative 15V supply.

Figure 2: Non-inverting Amplifier Place your schematic here 5. Set the input to an amplitude of 1V PP and frequency to 1 kHz, sinewave signal. 6. Connect channel A of the scope to the input signal across the input source and channel B at the output of the op-amp (pin 6). VCC V 15 VS 500 mVpk 1kHz 0° Rin kΩ 1 C1 µF 1 Rf 10kΩ C2 1µF VEE -15.0V U1 LM741CN 3 2 4 7 6 5 1

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7. Select both channels to AC coupling. 8. You should be able to see the following waveforms. (Oscilloscope may look different) Figure 3: Non-inverting Amplifier input/output waveforms Place your scope display here

9. Observe the phase shift between the input and output signal. The phase difference is ____________0 degrees_________. ( 0 degrees, 180 degrees) 10. Record the peak-to-peak output voltage of the amplifier in table 2 under the measured V out . 11. Calculate the measured gain of the amplifier using the measured output voltage and record the results in Table 2 under the measured voltage gain (Av). AV ¿ Vout / Vin 12. Replace the feedback resistor with new values listed under Table 2 and repeat steps 10 and 11. R in R f Calculated Gain (A V ) Calculated V OUT(pp) Measured V OUT(pp) Measured Gain (A V ) 1 kΩ 10 kΩ 11 11 vpp 10.955 vpp 11

1 kΩ 5.6kΩ 6.6 6.6 vpp 6.599 vpp 6.565 1 kΩ 1.5kΩ 2.5 2.5 vpp 2.497 vpp 2.505 Table 2: Calculated and measured values : noninverting Inverting Amplifier: 13. For the circuit shown in Figure 4 below, calculate the voltage gain of inverting amplifier for all the combinations of resistor values shown in Table 3. Record the results in Table 3 below under calculated voltage gain (Av). Av =− Rf / Rin 14. Calculate the output voltage of the amplifier and record the results in Table 3 under the calculated V OUT . V out = A V * V in 15. Construct the circuit shown in Figure 4 below in MultiSim. (Note: You don’t need to change the power supply connections from the previous circuit)

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Figure 4: Inverting Amplifier Place your schematic here VCC V 15 VS mVpk 500 kHz 1 ° 0 Rin kΩ 1 C1 1µF Rf 10kΩ C2 1µF VEE -15.0V U1 LM741CN 3 2 4 7 6 5 1

16. Connect channel A of the scope to the input signal across the input source and channel B at the output of the op-amp pin 6. 17. You should be able to see the following waveforms. Figure 5: Inverting Amplifier input/output waveforms Place your scope display here

18. Observe the phase shift between the input and output signal. The phase difference is _______________180 degrees_________________ . ( 0 degrees, 180 degrees) 19. Record the peak-to-peak output voltage of the amplifier in table 3 under the measured V out . 20. Calculate the measured gain of the amplifier using the measured output voltage and record the results in Table 3 under the measured voltage gain (Av). AV ¿ Vout / Vin 21. Replace the feedback resistor to a new value listed under Table 3 and repeat the steps 19 and 20. R in R f Calculated Gain (A V ) Calculated V OUT(pp) Measured V OUT(pp) Measured Gain (A V ) 1 kΩ 10 kΩ -10 -10vpp 9.954 vpp 9.99 1 kΩ 5.6kΩ -5.6 -5.6vpp 5.578 vpp 5.6 1 kΩ 1.5kΩ -1.5 -1.5 vpp 1.497 vpp 1.5 Table 3: Calculated and measured values : inverting

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Voltage Follower: 22. The circuit shown in Figure 6 below is a voltage follower. The voltage gain (A V ) of the voltage follower is _________1____ . Figure 6: Voltage Follower Place your schematic here VCC 15V VS mVpk 500 1kHz ° 0 AC_Power C1 1µF C2 µF 1 VEE V -15.0 U1 LM741CN 3 2 4 7 6 5 1

23. Construct the circuit shown in Figure 6 in MultiSim. 24. Connect channel A of the scope to the input signal across the input source and channel B at the output of the op-amp pin 6.

25. You should be able to see the following waveforms. Figure 7: Voltage follower input/output waveforms Place your scope display here

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26. Measure the output voltage. The output voltage is ____0.998v______________ . 27. Is the output signal following the input signal? ______The output voltage is equal to the input voltage, so yes the signal is following.________________ . 28. The phase shift between the input and the output signal is ________0 degrees____ . *********End of the experiment *********