Exam-style question
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When an op‑amp saturates, which of the following is true about its output?.
- A.It can still provide accurate amplification
- B.It behaves like a voltage source at the supply rail
- C.It behaves like an ideal op‑amp
- D.It stops amplifying but remains linear
Model answer
What a good answer should say
- It behaves like a voltage source at the supply rail
Explanation
Why this works
Initial state: The op‑amp has entered saturation because the desired output voltage lies outside the supply limits. Step‑by‑step execution: The output stage is forced to its maximum drive capability, so the output voltage is fixed at the nearest rail.
Final state: The output behaves as a voltage source that is held at the rail voltage. Conclusion: In saturation the op‑amp’s output can be described as a voltage source limited by the supply rails.
Common mistake
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