When a p-n junction is reverse-biased, the current becomes almost constant at 25 μA.
When a p-n junction is reverse-biased, the current becomes almost constant at 25 μA. When it is forward-biased at 200 mV, a current of 75 μA is obtained. Find the magnitude of diffusion current when the diode is
(a) unbiased, (b) reverse-biased at 200 mV and (c) forward-biased at 200 mV.
5 views
1 Answers
i1 = 25 μA, V = 200 mV, i2 = 75 μA
a) When in unbiased condition drift current = diffusion current
Diffusion current = 25 μA.
b) On reverse biasing the diffusion current becomes ‘O’.
c) On forward biasing the actual current be x.
x – Drift current = Forward biasing current
=> x – 25 μA = 75 μA
=> x = (75 + 25) μA = 100 μA.
5 views
Answered