Exam-style question
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What happens to the output amplitude of an op-amp when the input signal frequency exceeds the op-amp's bandwidth?.
- A.Output amplitude increases
- B.Output amplitude remains unchanged
- C.Output amplitude decreases
- D.Output amplitude becomes inverted
Model answer
What a good answer should say
- Output amplitude decreases
Explanation
Why this works
Rule: Bandwidth is the frequency range over which the op-amp can maintain its specified gain. Substitution: input frequency > f_bw.
Working: The gain falls beyond f_bw, so the output amplitude decreases. Answer: output amplitude decreases.
Conclusion: The output is attenuated.
Common mistake
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