Exam-style question
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Which of the following describes a common input‑related limitation of real op‑amps?.
- A.Input offset voltage
- B.Infinite input impedance
- C.Zero output resistance
- D.Unlimited common‑mode range
Model answer
What a good answer should say
- Input offset voltage
Explanation
Why this works
Rule: Input offset voltage (V_offset) is the voltage that must be applied to the inputs to make the output zero. Substitution: V_offset.
Working: Typical V_offset ≈ 1 mV. Answer: Input offset voltage.
Units: mV. Conclusion: Real op‑amps have a small but non‑zero input offset voltage.
Common mistake
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