  Question

# In a p-n junction diode, the current I can be expressed as , where is called the reverse saturation current, is the voltage across the diode and is positive for forward bias and negative for reverse bias, and is the current through the diode, is the Boltzmann constant and is the absolute temperature. If for a given diode and , then (a) What will be the forward current at a forward voltage of ?(b) What will be the increase in the current if the voltage across the diode is increased to ?(c) What is the dynamic resistance?(d) What will be the current if reverse bias voltage changes from to ?

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## (a)In a p-n junction diode, the expression for current is where is the reverse saturation current = Absolute temperature = is the voltage across diode.For forward voltage   (b) In a p-n junction diode, the expression for current is where is the reverse saturation current = Absolute temperature= is the voltage across diode. For forward voltage,   Hence, increase in current = (c) In a p-n junction diode, the expression for current is where is the reverse saturation current = Absolute temperature= is the voltage across diode. For forward voltage   For forward voltage   Hence increase in current= Dynamic resistance = Change in voltage /Change in current (d) If reverse bias voltage changes from to , the current will be almost constant, because dynamic resistance in the reverse bias is infinite. 0 0