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Find the current Ix if the voltage across the diode is 0.5V. The reverse saturation current of diode 10-11A, the cut-in voltage of diode is 0.6V. Assume that the temperature at which diode operates is 25°C. The resistance R1=2KΩ.

Find the current Ix if the voltage across the diode is 0.5V. The reverse saturation current of diode 10-11A, the cut-in voltage of diode is 0.6V. Assume that the temperature at which diode operates is 25°C. The resistance R1=2KΩ. Correct Answer 3.05mA

Since voltage drop across diode is 0.5V current through resistor is 0.5/2k = 0.25mA Current through diode where I0 = reverse saturation current η = ideality factor VT = thermal voltage V = applied voltage Since ideality factor is not given take it as one. Current through diode I = 10-11 x (e0.5/0.0257) = 2.8mA Total current = 2.8mA + 0.25mA = 3.05mA.

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