Exam-style question
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In a non‑inverting amplifier with supply ±15 V, if the input signal is 20 V peak, what happens?.
- A.Output swings ±20V
- B.Output saturates at ±15V
- C.Output is 0V
- D.Output is 10V
Model answer
What a good answer should say
- Output saturates at ±15V
Explanation
Why this works
Initial state: A non‑inverting amplifier with a gain of 2 is powered from ±15 V rails and receives a 20 V peak input. Step‑by‑step execution: The ideal calculation would give an output of 40 V, but the supply rails only allow ±15 V.
Final state: The output is forced to the nearest rail, +15 V or –15 V, and the amplifier is saturated. Conclusion: The output saturates at the supply rails when the required output exceeds them.
Common mistake
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