Exam-style question
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Which of the following is a consequence of phase inversion in an inverting amplifier?.
- A.The output waveform is inverted vertically
- B.The output waveform is delayed by 90°
- C.The output amplitude is doubled
- D.The output is identical to the input
Model answer
What a good answer should say
- The output waveform is inverted vertically
Explanation
Why this works
Formula: Vout = - (Rf/Rin) * Vin. Substitution: The negative sign changes the sign of every point on the waveform.
Working: Changing the sign flips the waveform about the horizontal axis, i.e., vertical inversion. Answer: The output waveform is inverted vertically.
Conclusion: Phase inversion results in a vertical flip of the output signal.
Common mistake
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