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Question & Answer
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The closed-loop system has a limited bandwidth compared to the open-loop system.
The open-loop system is more stable across different frequencies than the closed-loop system.
The closed-loop system exhibits gain that decreases with increasing frequency, unlike the open-loop system.
Both systems have the same frequency response characteristics.
Understanding the Answer
Let's break down why this is correct
When a part of the output is fed back to the input, the amplifier’s gain is limited and falls off as frequency rises. Other options are incorrect because It is common to think a closed‑loop setup can run at a wider bandwidth than an open‑loop one, but actually feedback reduces the bandwidth because it forces the amplifier to keep its gain lower; Many students believe the open‑loop amplifier is the more stable choice, yet it reacts wildly to frequency changes.
Key Concepts
Negative Feedback in Op-Amps
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Deep Dive: Negative Feedback in Op-Amps
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Definition
Negative feedback in op-amps involves connecting the output back to the input to achieve self-correction. In negative feedback, the ideal op-amp forces the inverting and non-inverting inputs to be equal, maintaining stability and precise control.
Topic Definition
Negative feedback in op-amps involves connecting the output back to the input to achieve self-correction. In negative feedback, the ideal op-amp forces the inverting and non-inverting inputs to be equal, maintaining stability and precise control.
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