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The below figure arrives to a conclusion that _________(a) for Vi > 0, V0=-(R2/R1)Vi(b) for Vi > 0, V0=0(c) Vi < 0, V0=-(R2/R1)Vi(d) Vi < 0, V0=0The question was posed to me during an interview for a job.This intriguing question comes from Half-Wave Rectifier topic in division Application of Diodes of Electronic Devices & Circuits

Answer»

Correct choice is (B) for Vi > 0, V0=0

For EXPLANATION: The given op-amp is in inverting mode and this makes the output voltage to have a phase shift of 180°. The output voltage is now NEGATIVE. So, the diode 1 is reverse BIASED and diode 2 is forward biased. Then output is clearly ZERO.



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