Exam-style question
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In comparing bandwidth of ideal and real op‑amps, which statement is true?.
- A.Ideal op‑amp has infinite bandwidth, real has finite
- B.Ideal op‑amp has finite bandwidth, real has infinite
- C.Both have the same bandwidth
- D.Real op‑amp has higher bandwidth than ideal
Model answer
What a good answer should say
- Ideal op‑amp has infinite bandwidth, real has finite
Explanation
Why this works
Define an ideal op‑amp as having an infinite bandwidth, meaning it can amplify signals of any frequency without attenuation. Define a real op‑amp as having a finite bandwidth, beyond which its gain falls.
The key difference is that the ideal op‑amp can handle all frequencies, whereas the real op‑amp is limited. This difference is relevant when designing circuits that require high‑frequency operation.
Therefore the correct statement is that the ideal op‑amp has infinite bandwidth while the real op‑amp has finite bandwidth.
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