Question

Calculate the value of $V_0$, if the silicon and germanium diode, start conducting at $0.7\text{V}$ and $0.3\text{V}$ respectively, in the given circuit. If the Ge diode connection be reversed, what will be the new values of $V_0$.

• A. $11.7,11.7$
• B. $11.3,11.7$
• C. $11.3,11.3$
• D. $11.7,11.3$

Answer 1

The correct option is D $11.7,11.3$

The effective forword voltage across Ge diode is, $12-0.3=11.7\text{V}$.

This will appear as the output voltage across the load , that is , $V_0=11.7\text{V}$

On reversing the connections of Ge diode, it will be reverse-biased and won't conduct any current. Only Si diode will conduct. The effective forward voltage across Si diode is, $12-0.7=11.3\text{V}$. This will appear as output, that is $V_0=11.3\text{V}$

Hence, $\left(D\right)$ is the correct answer.