Question

$\text{Consider the clipper circuit shown in the figure below. The forward cut-in voltage of the diode}{}^{}{}^{\prime }{D}_1^{\prime }{\text{and the Zener diode}}^{\prime }{D}_2^{\prime }\text{is equal to 0.7 V. The Zener breakdown voltage is}{V}_z=10\text{V and breakdown voltage for the diode}{D}_1\text{is 20 V.}$

Then the input transfer characteristics of the circuit is

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

Case-I
$\text{For positive input voltage when}{V}_i>5.7V,thediode{D}_1\text{will turn ON, thus voltage at the output}=5+0.7=5.7V.$
Case-I
$\text{For negative input voltage when}{V}_i<-0.7V,\text{then diode}{D}_2\text{will enter into forward region and thus will start conducting with a drop of 0.7 V on it.}$
$\text{Thus,}{V}_0=V_{in}\text{for}-0.7V<V_i<0\text{and}{V}_0=-0.7V\text{for}{V}_i<-0.7V.$