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Find the current I if both diodes are identical. Voltage V = 0.8V and let the reverse saturation current be 10^-9A.

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Find the current I if both diodes are identical. Voltage V = 0.8V and let the reverse saturation current be 10^-9A.

(a) 4.8mA

(b) 3.2mA

(c) 2.5mA

(d) 7mA

The question was posed to me during an online exam.

Question is from Characteristic Equation of Diode-2 topic in portion Diode Circuit of Analog Circuits

1 Answer

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Right answer is (a) 4.8mA

To explain: Since both diodes are identical VD = 0.8/2 = 0.4V

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 0.026 which is the standard value.

Hence current through one diode is 10^-9x(e^0.4/0.026) = 4.8mA.

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