Question 156: Semiconductors and Logic Gates

Question

Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of V
0
changes by : (assume that the Ge diode has large breakdown voltage)

Accepted Answer

Case 1
:
Ge need 0.3 V for start conducting and Si need 0.7 V for start conducting.
So, conduction will be start by Ge.
Out of 12 V,  0.3V will be consumed by Ge.
$$ 	herefore $$  V
01
= 12 $$-$$ 0.3  = 11.7 V
Case 2
:
Here as Ge diode is in reverse bias so no conduction will happen through Ge diode
As Si diode is in forward bias so conduction will happen through Si diode.
Here Si diode consume 0.7 V.
So, V
02
= 12 $$-$$ 0.7 = 11.3 V
$$ 	herefore $$  Value of V
0
changes by
= 11.7 $$-$$ 11.3 = 0.4 V

Answer

0.8 V

Answer

0.6 V

Answer

0.2 V

Answer

0.4 V

Semiconductors and Logic Gates

Ge and Si diodes start conducting at 0.3 V and 0.7 V respectively. In the following figure if Ge diode connection are reversed, the value of V 0 changes by : (assume that the Ge diode has large breakdown voltage)

Choose the correct answer: