Exam-style question
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In an inverting amplifier, the negative sign in the voltage gain equation indicates what?.
- A.Phase inversion
- B.Amplitude reduction
- C.No effect on phase
- D.Frequency shift
Model answer
What a good answer should say
- Phase inversion
Explanation
Why this works
Formula: Vout = - (Rf/Rin) * Vin. Substitution: The negative sign indicates that the output voltage is opposite in sign to the input voltage.
Working: Opposite sign means the waveform is inverted by 180°. Answer: Phase inversion.
Conclusion: The negative sign in the gain equation represents a 180° phase shift.
Common mistake
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