Exam-style question
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Which of the following is a limitation related to the open‑loop gain of real op‑amps?.
- A.Finite open‑loop gain
- B.Infinite input impedance
- C.Zero output resistance
- D.Unlimited common‑mode range
Model answer
What a good answer should say
- Finite open‑loop gain
Explanation
Why this works
Rule: The open‑loop gain (A_ol) of a real op‑amp is finite. Substitution: A_ol.
Working: Typical A_ol ≈ 10^5. Answer: Finite open‑loop gain.
Units: dimensionless. Conclusion: Real op‑amps have limited open‑loop gain, affecting their performance.
Common mistake
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