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Calculate the forward bias current of a Si diode when forward bias voltage of 0.4V is applied, the reverse saturation current is 1.17×10^-9A and the thermal voltage is 25.2mV.(a) 9.156mA(b) 8.23mA(c) 1.256mA(d) 5.689mAThe question was posed to me in an online quiz.Asked question is from Characteristic Equation of Diode-1 in portion Diode Circuit of Analog Circuits

Answer»

Right option is (a) 9.156mA

The explanation is: EQUATION for diode current

I=I0×(e^(V/ηVT)-1)where I0 = reverse saturation current

η = ideality factor

VT = THERMAL voltage

V = applied voltage

Since in this question ideality factor is not mentioned it can be TAKEN as one.

I0 = 1.17 X 10^-9A, VT = 0.0252V, η = 1, V = 0.4V

Therefore, I = 1.17×10^-9xe^0.4/0.025 -1 = 9.156mA.


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