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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 I is the current through the diode, is the Boltzmann constant and is the absolute temperature. If for a given diode and , then
(a) What is the dynamic resistance?
(b) What will be the current if reverse bias voltage changes from to ?

Vinay

The expression for current in a p-n junction diode, is given as

Here,

is the Boltzmann constant with a value of

(a) Dynamic resistance Change in voltage/ Change in current

(b) The current will nearly always be equal to if the reverse bias voltage is changed from 1V to 2V. As a result, with the reverse bias, the dynamic resistance will be infinite.