Ge and Si diodes conduct at 0.3 V and 0.7 V respectively. In the following figur

Question

Ge and Si diodes conduct at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the valve of

V_{0}

changes by

Ge And Si Diodes Conduct At 0.3 V And 0.7 V Respectively. In...

Options:

A . 0.2 V

B . 0.4 V

C . 0.6 V

D . 0.8 V

Answer: Option B
:
B
Consider the case when Ge and Si diodes are connected as show in the given figure.
Equivalent voltage drop across the combination Ge and Si diode = 0.3 V

\Rightarrow

Current

i = \frac{12 - 0.3}{5 k Ω} = 2.34 m A

∴

Out put voltage

V_{0} = R i = 5 k Ω \times 2.34 m A = 11.7 V

Now consider the case when diode connection are reversed. In this case voltage drop across the diode's combination = 0.7 V

\Rightarrow

current

i = \frac{12 - 0.7}{5 k Ω} = 2.26 m A

∴ V_{0} = i R = 2.26 m A \times 5 k Ω = 11.3 V

Hence charge in the value of

v_{0}

=11.7 - 11.3=0.4V

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