The I-V characteristic of a p-n junction diod | vedclass

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Question

(B) The dynamic resistance $r_d$ is defined as the reciprocal of the slope of the $I-V$ characteristic curve,given by $r_d = \frac{\Delta V}{\Delta I}

Vedclass · Accepted Answer

$40$

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(B) The dynamic resistance $r_d$ is defined as the reciprocal of the slope of the $I-V$ characteristic curve,given by $r_d = \frac{\Delta V}{\Delta I}$.From the graph,at a forward bias of $1 	ext{ V}$,the current is $10 	ext{ mA}$. At $1.2 	ext{ V}$,the current is $15 	ext{ mA}$.Using these values:$\Delta V = 1.2 	ext{ V} - 1.0 	ext{ V} = 0.2 	ext{ V}$$\Delta I = 15 	ext{ mA} - 10 	ext{ mA} = 5 	ext{ mA} = 5 	imes 10^{-3} 	ext{ A}$Therefore,$r_d = \frac{0.2 	ext{ V}}{5 	imes 10^{-3} 	ext{ A}} = \frac{0.2}{0.005} \ \Omega = 40 \ \Omega$.

The $I-V$ characteristic of a $p-n$ junction diode is shown in the figure. Find the approximate dynamic resistance of the $p-n$ junction when a forward bias of $1 \text{ V}$ is applied. (in $\Omega$)

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