Exam-style question
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During output saturation, the op‑amp’s output is best described as:.
- A.A linear amplifier
- B.A constant current source
- C.A voltage source limited by supply rails
- D.An ideal voltage follower
Model answer
What a good answer should say
- A voltage source limited by supply rails
Explanation
Why this works
Initial state: The op‑amp is in saturation because the desired output voltage is beyond the supply rails. Step‑by‑step execution: The output stage is forced to its maximum drive, so the output voltage is held at the rail voltage.
Final state: The output behaves as a voltage source that is fixed at the rail. Conclusion: During saturation the op‑amp’s output is best described as a voltage source limited by the supply rails.
Common mistake
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