Which condition approves to be valid in case of reference voltage for the determination of clipping level?

Q.  Which condition approves to be valid in case of reference voltage for the determination of clipping level?
- Published on 23 Oct 15

a. Reference voltage must be less than input voltage
b. Reference voltage must be greater than input voltage
c. Reference voltage must be less than output voltage
d. Reference voltage must be greater than output voltage

ANSWER: Reference voltage must be less than input voltage
 
Generation of clipping circuit using op-amp & rectifier diode is possible where the op-amp act as a voltage follower with diode in a feedback path. Since clipping circuit eliminates the positive parts of input signal, so the the value of reference voltage helps in determining the clipping level. Therefore, the voltage difference 'Vref' must be smaller than input voltage. When Vin Vref, then reference voltage is higher at the negative input as compared to that of the positive input.

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