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Find voltage VOUT if the reverse saturation current of the diode is1.1×10^-8A, the cut-in voltage of diode is 0.6V and assume the temperature as 25^oC.(a) 0.235V(b) 0.3148V(c) 0.456V(d) 0.126VThis question was addressed to me in an interview for job.My question is from Characteristic Equation of Diode-2 topic in division Diode Circuit of Analog Circuits

Answer»

Correct answer is (b) 0.3148V

The explanation: Equation for diode current

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. Take VT as its standard value 0.026V.

Voltage VD = ηVTln(I/IO + 1) = 1 x 0.0257ln (2 x 10^-3/(1.1 x 10^-9))+1) = 0.0257ln(1,818,182) = 0.3704 V.


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