Exam-style question
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Which of the following best describes the relationship between bandwidth and gain for a real op-amp?.
- A.Bandwidth increases as gain increases
- B.Bandwidth decreases as gain increases
- C.Bandwidth is independent of gain
- D.Bandwidth is equal to gain
Model answer
What a good answer should say
- Bandwidth decreases as gain increases
Explanation
Why this works
Rule: The gain‑bandwidth product of a real op‑amp is approximately constant. Substitution: higher closed‑loop gain → lower bandwidth to keep the product constant.
Working: If gain doubles, bandwidth halves. Answer: bandwidth decreases.
Conclusion: Higher gain reduces bandwidth.
Common mistake
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