Learning Path
Question & Answer1
Understand Question2
Review Options3
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Explore TopicChoose the Best Answer
A
It increases the input impedance and decreases the output impedance.
B
It ensures the output adjusts to match the input, minimizing distortion.
C
It amplifies the input signal without any adjustments.
D
It prevents the op-amp from operating in a linear region.
Understanding the Answer
Let's break down why this is correct
Answer
Negative feedback takes a portion of an op‑amp’s output and feeds it back to the input with opposite polarity, which reduces the overall gain to a predictable, lower value. Because the feedback forces the output to match the input reference, the circuit becomes less sensitive to component variations, temperature changes, and supply voltage fluctuations, thereby increasing stability. The feedback also flattens the frequency response and limits distortion, improving bandwidth and linearity. For example, in an inverting amplifier with a 10 kΩ input resistor and a 20 kΩ feedback resistor, the closed‑loop gain becomes exactly –2, giving a stable, precise amplification. Thus, negative feedback makes op‑amp circuits reliable, accurate, and easier to design.
Detailed Explanation
Negative feedback lets the amplifier check its own output and compare it with the input signal. Other options are incorrect because Some think negative feedback mainly changes how much resistance a circuit has; A common belief is that feedback simply boosts the signal.
Key Concepts
Negative Feedback
Operational Amplifiers (Op-Amps)
Stability in Circuits
Topic
Negative Feedback in Op-Amps
Difficulty
medium level question
Cognitive Level
understand
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