Exam-style question
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Which statement best describes the phase relationship between input and output in an inverting amplifier?.
- A.Output is 180° out of phase with input
- B.Output is 90° out of phase with input
- C.Output is in phase with input
- D.Output is 270° out of phase with input
Model answer
What a good answer should say
- Output is 180° out of phase with input
Explanation
Why this works
Formula: Vout = - (Rf/Rin) * Vin. Substitution: The negative sign shows that Vout is opposite in sign to Vin.
Working: A negative sign corresponds to a 180° phase shift. Answer: The output is inverted (180° out of phase).
Conclusion: Phase inversion occurs in an inverting amplifier.
Common mistake
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