Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Determine the required gain for your application
B
Select an appropriate op-amp that meets the gain specification
C
Implement negative feedback to stabilize the gain
D
Measure the output to verify that it meets the design criteria
Understanding the Answer
Let's break down why this is correct
Answer
To design a practical op‑amp with negative feedback for a specific gain, first decide the desired closed‑loop gain and choose the feedback network that will produce it; for a non‑inverting amplifier the gain is 1 + Rf/Rin, so pick resistor values that give that ratio. Next, select resistor values that are close to standard values and ensure the op‑amp’s open‑loop gain is much larger than the feedback factor so that the actual gain is accurate. Then, check the bandwidth and phase margin by considering the op‑amp’s gain‑bandwidth product and any additional poles introduced by the feedback resistors. Finally, build the circuit, measure the output, and adjust the resistor values if the measured gain deviates from the target. For example, to get a gain of 10, choose Rin = 1 kΩ and Rf = 9 kΩ, giving a theoretical closed‑loop gain of 10, and verify it with a multimeter.
Detailed Explanation
The first step is to decide what gain is needed for the application. Other options are incorrect because Picking an op‑amp before knowing the target gain is a common mistake; Designing negative feedback before selecting the op‑amp ignores the op‑amp’s stability limits.
Key Concepts
Op-Amp Gain
Negative Feedback
Circuit Design
Topic
Op-Amp Gain and Practical Considerations
Difficulty
medium level question
Cognitive Level
understand
Practice Similar Questions
Test your understanding with related questions
1
Question 1An engineer is designing a circuit using an operational amplifier and decides to implement negative feedback. Which of the following scenarios best illustrates the concept of negative feedback in op-amps?
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Question 2Arrange the following steps in the process of how negative feedback operates in an operational amplifier (op-amp): 1) The output voltage is compared with the input voltage; 2) The error signal is generated; 3) The feedback is applied to the inverting input; 4) The op-amp adjusts the output to minimize the error.
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Question 3In a negative feedback op-amp configuration, what is the primary reason for implementing feedback?
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Question 4How does negative feedback influence the gain of an op-amp in practical circuits?
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Question 5An engineer is designing a circuit using an operational amplifier and decides to implement negative feedback. Which of the following scenarios best illustrates the concept of negative feedback in op-amps?
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Question 6Arrange the following steps in the process of how negative feedback operates in an operational amplifier (op-amp): 1) The output voltage is compared with the input voltage; 2) The error signal is generated; 3) The feedback is applied to the inverting input; 4) The op-amp adjusts the output to minimize the error.
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Question 8Arrange the following steps in the process of how negative feedback operates in an operational amplifier (op-amp): 1) The output voltage is compared with the input voltage; 2) The error signal is generated; 3) The feedback is applied to the inverting input; 4) The op-amp adjusts the output to minimize the error.
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Question 9Arrange the steps for designing a practical op-amp circuit using negative feedback to achieve a desired gain.
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Question 10How does negative feedback influence the gain of an op-amp in practical circuits?
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