Week 5 Lab Instructions Inverting and Non-inverting Op-Amp Circuits I. Objectives 1. To analyze the characteristics of an inverting amplifier using...

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BNC to split-ends cable

Hook-up wires of different colors

Software: MultiSim

III. Procedure

A.     Theoretical Analysis of Inverting Op-Amp Circuit

Given the circuit in Figure 1, write down the formula for the gain of the inverting op amp in terms R1 and R2 on the worksheet. Then, calculate the output voltage of the op amp for input voltages of 1, 3, 5, 7, and 9 volts. Enter the results in Column A of Table 1.

Figure 1—Inverting Op-Amp Circuit

B.     MultiSim Simulation of Inverting Op-Amp Circuit

A.     Enter the circuit shown in Figure 1 in Multisim. To switch the + and - terminals of the op-amp, right click on the op-amp symbol and click on Flip Vertical. Do the same for VCC to get exactly as shown in Figure 1. A typical MultiSim circuit is shown below.

B.     Measure the output voltage of the inverting op amp for input voltages of 1, 3, 5, 7, and 9 volts, and enter measured values in Column B of Table 1 on the worksheet.

3.   Compare the simulation results with theoretical results and enter your comments on the worksheet.

C.     Experimental Breadboard Construction of Inverting Op-Amp Circuit

1.      Construct the circuit in Figure 1. Use op-amp HA17741 if you do not have LM741 as shown in Figure 1. Take a picture of your circuit and insert it on the worksheet. A typical constructed circuit on breadboard in shown below.

2.      Measure the output voltage of the inverting op amp for input voltages of 1, 3, 5, 7, and 9 volts, and enter measured values in Column C of Table 1 on the worksheet.

D.     Theoretical Analysis of Noninverting Op-Amp Circuit

Given the circuit in Figure 2, write down the formula for the gain of the noninverting op amp in terms R1 and R2 on the worksheet. Then, calculate the output voltage of the op amp for input voltages of 1, 3, 5, 7, and 9 volts. Enter the results in Column A of Table 2.

Figure 2—Noninverting Op-Amp Circuit

E.      MultiSim Simulation of Noninverting Op-Amp Circuit

Enter the circuit shown in Figure 2 in MultiSim. A typical MultiSim circuit is shown below.

2.      Measure the output voltage of the noninverting op amp for input voltages of 1, 3, 5, 7, and 9 volts, and enter measured values in Column B of Table 2 on the worksheet.

3.      Compare the simulation results with theoretical results and enter your comments on the worksheet.

F.      Experimental Breadboard Construction of Inverting Op-Amp Circuit

1.      Construct the circuit in Figure 2. Use op-amp HA17741 if you do not have LM741 op amp as shown in Figure 2. Take a picture of your circuit and insert it on the worksheet. A typical constructed circuit on breadboard is shown below.

2.   Measure the output voltage of the noninverting op amp for input voltages of 1, 3, 5, 7, and 9 volts, and enter measured values in Column C of Table 2 on the worksheet.

3.   Compare the theoretical, simulation, and hardware circuit results, and enter your comments on the worksheet.

G.    Design of an Inverting Op-Amp Circuit with AC Source

1.      Construct the circuit shown in Figure 3 on MultiSim. Determine the value of R2 for a gain of . Note that R1 = 1 kΩ. Enter the value of R2 on the worksheet.

Figure 3—Inverting Op-Amp Circuit With AC Input

2.      Copy and paste the MultiSim oscilloscope display of input and output signals on the worksheet, in a similar manner as what is shown in Figure 4.

3.      Comment on the results of the simulation. Is the output signal inverted?

H.    Construct the Op-Amp Circuit with AC Source on Breadboard

1.      Construct the circuit of Figure 3 on a breadboard. Use the value of R2 found in Step G.1. Use op-amp HA17741 if you do not have LM741 op amp as shown in Figure 3. Take a picture of your circuit and place it on the worksheet.

2.      Connect CH1 of your oscilloscope across the input signal and CH2 across the output. Observe the signals. Copy (or take a picture of) the oscilloscope display and insert it on the worksheet.

Comment on the results. Is the output signal inverted? Is the output signal amplified by a gain of -30?

I.       Results Analysis

Complete the tables containing the Theoretical, Simulation, and Experimental results obtained for the input and

2.      simulation, and hardware circuit results, and enter your comments on the worksheet.

IV. Troubleshooting

Describe any problems encountered and how those problems were solved.

V. Questions

1.      Design an amplifier with a gain of -2 using MultiSim. Copy and paste your circuit on the worksheet.

2.      Design an amplifier with a gain of 2 using MultiSim. Copy and paste your circuit on the worksheet.

3.      What is the phase shift between the input and output signals of an inverting op amp?

4.      What is the phase shift between the input and output signals of a non-inverting op amp?