Question

Find the applied voltage on a forward biased diode if the current is 1mA and reverse saturation current is 10^-10. Temperature is 25°C and takes ideality factor as 1.5.

(a) 0.658V

(b) 0.726V

(c) 0.526V

(d) 0.618V

I got this question in an online quiz.

The above asked question is from Characteristic Equation of Diode-1 topic in chapter Diode Circuit of Analog Circuits

Answer 1

Right option is (d) 0.618V

Easiest explanation: Equation for diode current

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

             η = ideality factor

             VT = thermal voltage

             V = applied voltage

VT at T = 25+273=298 is 298/11600 = 0.0256V, η = 1.5, I = 1mA, I0 = 10^-10A