3. This circuit in Figure 9.1 illustrates one of the most common applications of an Op- amp, a closed-loop gain-inverting amplifier. Note that DC signal is applied to the negative (-) input terminal: 1V Vin V2 H 15V Rf w 100kO Ri w 10kO Op Amp 741 V1 H Vout XMM1 RI 25k0 Figure 9.1 3.1 Using Multisim construct the circuit in Figure 9.1 and study its working principle and performance. a) Analyse the circuit with special attention to the voltages developed across the input resistor (Ri) and the feedback resistor (Rf). Is the voltage across Rf equal to the input voltage Vin? If yes, explain why. Discuss the polarity of the output voltage. Is it negative when the Vin is positive? Is that the reason why this amplifier is called an inverting amplifier? Support your explanation with the appropriate equations for the output voltage and the closed-loop gain. b) After extracting the formulas in part 1 and component values as in the circuit calculate Vout and gain 'm' compare the results with the appropriate readings and verify that the gain 'm' is the ratio of the output voltage to the input voltage. Record it in your logbook. Also, calculate the value of load current using formula: lin = Vin/Ri. What is the op-amp total output current? c) Set the various values of Rr and R. Note how changes affect the output voltage and gain. Is the gain determined by the external resistors Rf and Ri? Also, try to verify what parameters affect the load current. Is it R1 and Vout? 3. Discussion on Results and Observations: Summarise the whole lab session in your own words. Discuss what experience you gained after completing this lab exercise. Give a brief account of all the problems you have faced and how did you solve these problems? Also, explain how your last week experience helped you in carrying out this task independently. How does the results correlate with the theory you learned in classes? Give names of some real- world applications where these circuits have been used.
3. This circuit in Figure 9.1 illustrates one of the most common applications of an Op- amp, a closed-loop gain-inverting amplifier. Note that DC signal is applied to the negative (-) input terminal: 1V Vin V2 H 15V Rf w 100kO Ri w 10kO Op Amp 741 V1 H Vout XMM1 RI 25k0 Figure 9.1 3.1 Using Multisim construct the circuit in Figure 9.1 and study its working principle and performance. a) Analyse the circuit with special attention to the voltages developed across the input resistor (Ri) and the feedback resistor (Rf). Is the voltage across Rf equal to the input voltage Vin? If yes, explain why. Discuss the polarity of the output voltage. Is it negative when the Vin is positive? Is that the reason why this amplifier is called an inverting amplifier? Support your explanation with the appropriate equations for the output voltage and the closed-loop gain. b) After extracting the formulas in part 1 and component values as in the circuit calculate Vout and gain 'm' compare the results with the appropriate readings and verify that the gain 'm' is the ratio of the output voltage to the input voltage. Record it in your logbook. Also, calculate the value of load current using formula: lin = Vin/Ri. What is the op-amp total output current? c) Set the various values of Rr and R. Note how changes affect the output voltage and gain. Is the gain determined by the external resistors Rf and Ri? Also, try to verify what parameters affect the load current. Is it R1 and Vout? 3. Discussion on Results and Observations: Summarise the whole lab session in your own words. Discuss what experience you gained after completing this lab exercise. Give a brief account of all the problems you have faced and how did you solve these problems? Also, explain how your last week experience helped you in carrying out this task independently. How does the results correlate with the theory you learned in classes? Give names of some real- world applications where these circuits have been used.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Transcribed Image Text:3. This circuit in Figure 9.1 illustrates one of the most common applications of an Op-
amp, a closed-loop gain-inverting amplifier. Note that DC signal is applied to the
negative (-) input terminal:
1V
Vin
V2
H
15V
Rf
w
100kO
Ri
w
10kO
Op Amp
741
V1
H
Vout
XMM1
RI
25k0
Figure 9.1
3.1 Using Multisim construct the circuit in Figure 9.1 and study its working principle
and performance.
a) Analyse the circuit with special attention to the voltages developed across the
input resistor (Ri) and the feedback resistor (Rf). Is the voltage across Rf equal to
the input voltage Vin? If yes, explain why. Discuss the polarity of the output
voltage. Is it negative when the Vin is positive? Is that the reason why this
amplifier is called an inverting amplifier? Support your explanation with the
appropriate equations for the output voltage and the closed-loop gain.
b) After extracting the formulas in part 1 and component values as in the circuit
calculate Vout and gain 'm' compare the results with the appropriate readings and
verify that the gain 'm' is the ratio of the output voltage to the input voltage.
Record it in your logbook. Also, calculate the value of load current using formula:
lin = Vin/Ri. What is the op-amp total output current?
c) Set the various values of Rr and R. Note how changes affect the output voltage
and gain. Is the gain determined by the external resistors Rf and Ri? Also, try to
verify what parameters affect the load current. Is it R1 and Vout?
3. Discussion on Results and Observations:
Summarise the whole lab session in your own words. Discuss what experience you
gained after completing this lab exercise. Give a brief account of all the problems
you have faced and how did you solve these problems? Also, explain how your last
week experience helped you in carrying out this task independently. How does the
results correlate with the theory you learned in classes? Give names of some real-
world applications where these circuits have been used.
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