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  • At a temperature of 300 K, a p-n junction has a saturation current of 0.6 mA. Find the current when the voltage across the diode is 1mV, 100 mV and -1V.Option: 1

At a temperature of 300 K, a p-n junction has a saturation current of 0.6 mA. Find the current when the voltage across the diode is 1mV, 100 mV and -1V.

Option: 1

zero


Option: 2

0.2 A


Option: 3

0.4 A


Option: 4

0.6 A


Answers (1)

best_answer

At a temperature of 300 K, the p-n junction has a saturation current

\mathrm{\mathrm{I}_{\mathrm{s}}=0.6 \times 10^{-3} \mathrm{~A}}

The current voltage relation for the diode is

\mathrm{\begin{aligned} & \mathrm{i}=\mathrm{i} s\left(\mathrm{e}^{\mathrm{qV} / \mathrm{k}_{\mathrm{B}} \mathrm{T}}-1\right) \\ & \mathrm{kB}_{\mathrm{B}} \mathrm{T}(\text { at } 300 \mathrm{k}) \approx 0.026 \mathrm{eV} \end{aligned}}

\mathrm{For \; \mathrm{V}=1 \mathrm{mV}, \mathrm{i}=23 \mu \mathrm{A} ; \mathrm{V}=100 \mathrm{mV}, i=27.5 \mathrm{~mA}}

\mathrm{and \; \mathrm{V}=-1 \mathrm{~V}}

            \mathrm{\mathrm{i}=-0.6 \mathrm{~mA}}

Posted by

Gaurav

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