Electronics and Communication Engineering - Exam Questions Papers - Discussion
Discussion Forum : Exam Questions Papers - Exam Paper 11 (Q.No. 45)
45.
A germanium diode has a reverse saturation current of 30 μA at 125°C and forward current of 1 mA at a forward potential of 0.8 V and the reverse potential is 0.6 V What are its dynamic forward and reverse resistance at this temperature.
Answer: Option
Explanation:
We have,
I = I0•(eV/nVT -1)
∴ 
For forward voltage greater than few teeth's of volts, I >> I0
∴ 
∴ Forward dynamic resistance,
= 34.3 Ω
Reverse dynamic resistance = 
= 20 kΩ.
Discussion:
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