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Negative Feedback in Op-Amps
hard

A sound engineer is designing a feedback system for a microphone amplifier to minimize noise and enhance audio clarity. They decide to implement negative feedback in their op-amp circuit. Which of the following outcomes is the most likely result of using negative feedback in this scenario?

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Choose the Best Answer

A

The output will become unstable, leading to distortion in the audio signal.

B

The input impedance will decrease, which may cause the microphone to pick up more unwanted noise.

C

The gain of the amplifier will be reduced but the linearity and stability of the output will improve.

D

The circuit will only respond to high-frequency signals, ignoring lower frequencies.

Understanding the Answer

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Answer

Negative feedback in the microphone amplifier will lower the overall gain but will make the amplifier more linear, which means it will reproduce the sound more faithfully and with less distortion. The feedback also pushes the amplifier’s bandwidth higher, so it can follow rapid changes in the audio signal more accurately. Because the feedback forces the output to match the input more closely, random noise and offset errors are reduced, giving a cleaner, clearer signal. For example, if the amplifier originally had a gain of 100 V/V, adding negative feedback might drop it to 50 V/V but the output will be much cleaner and more accurate.

Detailed Explanation

Negative feedback lowers the overall gain of the amplifier. Other options are incorrect because Some think negative feedback makes the output unstable; A misconception is that negative feedback lowers the input impedance.

Key Concepts

Negative Feedback in Op-Amps
Operational Amplifier Stability
Audio Signal Processing
Topic

Negative Feedback in Op-Amps

Difficulty

hard level question

Cognitive Level

understand

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An 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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