Exam-style question
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Which of the following is a limitation of real op‑amps that ideal op‑amps do not exhibit?.
- A.Infinite input impedance
- B.Zero output impedance
- C.Slew‑rate limitation
- D.No offset voltage
Model answer
What a good answer should say
- Slew‑rate limitation
Explanation
Why this works
Define an ideal op‑amp as having an infinite slew rate, so its output can change instantaneously. Define a real op‑amp as having a finite slew rate, limiting how quickly its output can change.
The key difference is the slew‑rate limitation present only in real op‑amps. This applies when the input signal changes rapidly, such as high‑frequency or large‑amplitude signals.
Consequently, the correct limitation is the slew‑rate limitation.
Common mistake
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