First slide

Diodes

Question

The I– V characteristic of a p – n junction diode is shown in figure. Find the approximate dynamic resistance of the p – n junction when
a). a forward bias of 1 Volt is applied
b). a forward bias of 2 Volt is applied

Moderate

A

$50 Ω, 0.35 Ω$
B

$40 Ω, 0.25 Ω$
C

$60 Ω, 0.20 Ω$
D

$80 Ω, 0.30 Ω$

Solution

a). The current at 1 Volt is 10 mA and at 1.2 Volt is 15 mA . The dynamic resistance in this region is
$R = \frac{Δ V}{Δ i} = \frac{(1.2 - 1) Volt}{(15 - 10) mA} = \frac{0.2 Volt}{5 mA} = 40 Ω$
b). The current at 2 Volt is 400 mA and at 2.1 Volt it is 800 mA. The dynamic resistance is

$R = \frac{Δ V}{Δ i} = \frac{(2.1 - 2) Volt}{(800 - 400) mA} = \frac{0.1 Volt}{400 mA} = 0.25 Ω$

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