Experiment: Non-Inverting Op-Amp frequency response
Objective: To understand and gain and frequency relationship in non-inverting amplifier configuration.
Components and instruments needed:
• Resistors: one 1 k?, one 150k?
• Capacitors: two 1.0 µF
• Op-amp: one LM741C
• DC power supply
• Function generator
• Multimeter
Figure 1
Procedure:
1. The schematic for the non-inverting amplifier is shown in the figure 2.
2. Measure and record the resistor values in table 1. Input resistance Ri = 1 k?, feedback resistor Rf = 150k?.
Table 1:
|
Resistor
|
Listed value
|
Measured value
|
|
Ri
|
1 k?
|
983.20 ?
|
|
Rf
|
150 k?
|
151.68 k?
|
3. Connect the circuit shown in figure 2.
4. Apply a 50 mVrms, 1 kHz (no offset) sine wave input to the non-inverting as shown in the figure.
5. Using the multimeter measure and record Vin and Vout in table 2. Note that the multimeter gives you RMS values only.
6. Increase the frequency from 1 kHz to 10 kHz at 2.5 kHz steps and repeat the step 5 (i.e., measure Vin and Vout) for each frequency.
7. Plot the frequency-gain dependence plot using a plotting software (such as excel) and include it in your lab report.
Table 2:
|
Source frequency
|
Vin
|
Vout
|
Acl(NI)
|
|
1 kHz
|
50.36 mV
|
7.694 V
|
152.78
|
|
2.5 kHz
|
50.36 mV
|
7.220 V
|
143.37
|
|
5 kHz
|
50.36 mV
|
6 V
|
119.14
|
|
7.5 kHz
|
50.36 mV
|
4.833 V
|
95.97
|
|
10 kHz
|
50.36 mV
|
3.94 V
|
78.24
|
Figure 2
Report:
Write a report that summarizes this experiment. Your report brief must include:
a) Cover sheet.
b) Objective - a short paragraph stating what the experiment is about.
c) Procedure - a description of the process of conducting the experiment. It should not be a step-by-step account, but rather an overview of what was done.
d) Discussion - a complete discussion of the results of the experiment and the principals involved. Include the outputs and also the screen captures as needed to support the statements made in this section. Relegate extensive lists of raw data and detailed computations to an appendix as appropriate.
e) Conclusion - a summary of what you have learned from the experiment.