Ge and Si diodes conduct at 0.3V and 0.7V respectively. In the following figure if Ge diode connection are reversed, the value of V0 changes by
A
0.2V
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B
0.4V
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C
0.6V
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D
0.8V
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Solution
The correct option is B0.4V Consider the case when Ge and Si diodes are connected as per the diagram Equivalent voltage drop across the combination Ge and Si diode =0.3V ⇒Currenti=12−0.35kΩ=2.26mA V0=iR=2.26mA×5kΩ=11.7V
Now consider the case when diode connection is reversed. In this voltage drop across the combination Ge and Si diode =0.7V ⇒Currenti=12−0.75kΩ=2.26mA V0=iR=2.26mA×5kΩ=11.3V