Exam-style question
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Which of the following best describes the output voltage range of an inverting amplifier powered by ±15 V rails?.
- A.-15 V to +15 V
- B.-30 V to +30 V
- C.0 V to +15 V
- D.-15 V to 0 V
Model answer
What a good answer should say
- -15 V to +15 V
Explanation
Why this works
Initial state: Supply rails V+ = +15 V, V− = -15 V. Step 1: Determine theoretical output range: Vout can swing between V− and V+.
Step 2: Therefore, Vout ∈ [-15 V, +15 V]. Final state: Output voltage range is -15 V to +15 V.
Conclusion: The amplifier cannot produce outputs beyond the supply rails.
Common mistake
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