In the circuit shown in figure, the silicon and germanium diodes start conducting at 0.7 V and 0.3 V

Question

In the circuit shown in figure, the silicon and germanium diodes start conducting at 0.7 V and 0.3 V respectively. What are the values of $V_0$ and $I$ ?

Professor PC Thomas Classes · Answer

(b) : The germanium diode will start conducting before the silicon diode does so. The voltage across $\mathrm{Ge}=0.3 \mathrm{~V}$. The output voltage $V_0$ is the voltage across $R=12-0.3=11.7 \mathrm{~V}$ The current $I=\frac{11.7 \mathrm{~V}}{5 \mathrm{k} \Omega}=\frac{11.7}{5 	imes 10^3}=2.34 \mathrm{~mA}$