Exam-style question
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If the input signal to an inverting amplifier is a sine wave of 1 V amplitude, what will be the phase of the output relative to the input?.
- A.Same phase
- B.180° out of phase
- C.90° out of phase
- D.270° out of phase
Model answer
What a good answer should say
- 180° out of phase
Explanation
Why this works
Formula: Vout = - (Rf/Rin) * Vin. Substitution: The negative sign flips the sign of the sine wave.
Working: Flipping the sign corresponds to a 180° phase shift. Answer: The output is 180° out of phase.
Conclusion: The output waveform is inverted relative to the input.
Common mistake
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