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Negative Feedback in Op-Amps
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Which of the following is a common application of negative feedback in operational amplifiers (op-amps)?

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Choose the Best Answer

A

Voltage follower

B

Oscillator circuit

C

Signal generator

D

Digital circuit

Understanding the Answer

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Answer

Negative feedback is often used in op‑amps to set a precise, stable gain and to reduce distortion. By feeding a portion of the output back to the input in the opposite phase, the circuit automatically corrects any error between the desired and actual output. This technique produces linear amplifiers such as the inverting or non‑inverting amplifier, where the gain is simply the ratio of two resistors. For example, connecting two resistors in a classic inverting amplifier configuration gives a fixed gain of –R2/R1, and the negative feedback keeps the output at the correct level. Thus, using negative feedback is a common way to build accurate, low‑noise amplifiers.

Detailed Explanation

A voltage follower uses negative feedback to force the output to match the input. Other options are incorrect because Oscillators need positive feedback to keep the signal growing; Signal generators often rely on oscillators or other active circuits, not on negative feedback alone.

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Negative Feedback in Op-Amps

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easy level question

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understand

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Which of the following is a common application of negative feedback in operational amplifiers (op-amps)?

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