Analog Electronics - GATE practice papers - Electronics & Communication for Q. 508

Q.  Consider the following statements. Which of them represents the precise condition of clipper circuits  that clips the input voltage above a reference voltage?

A. If VR> Vi , then diode is supposed to be reversed-biased & hence V0= Vi
B. If Vi> VR , then diode is supposed to be forward-biased & hence V0 = Vi (Marks : 02)
- Published on 19 Oct 15

a. A is false and B is true
b. A is true and B is false
c. Both A & B are true
d. Both A &B are false

ANSWER: A is true and B is false
 
Clipper circuits are applicable for selecting that portion of input wave which is located above or below the reference levels.
For the clipper circuit that clips the input voltage above the reference voltage , the necessary operational conditions are

1) If Vi < VR, then diode is reverse-biased & does not operate or conduct Thus, V0= Vi &
2) If Vi>VR , then diode operates in forward biased condition & hence Vo = VR

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