I am trying to understand the workings of a diode. On one side, I have the ideal diode equation which says, I = Isat * [exp(V/Vt) -1 ]. Say, the diode reverse saturation current to be approximated to 10^15 Amps, vt = 25 mV at room temp, I have plotted the V-I curve for the equation as below. (Another question is from where to obtain the values of reverse saturation current. I cannot find it in the diode datasheet say for 1n4001. Hence I have taken an approximation only).
Now I look at the datasheet of diode 1N4001, and I find the V-I curves to be not similar especially after 1 volt. I am referring to the instantaneous voltage current curve in the datasheet(attached). This curve does look like an exponential curve till 1 volt, beyond that the curve is not linear.
My question is, why are the graphs not similar? Or is there any fault with the values I have chosen or any fault in my comparison?View attachment 80248
Now I look at the datasheet of diode 1N4001, and I find the V-I curves to be not similar especially after 1 volt. I am referring to the instantaneous voltage current curve in the datasheet(attached). This curve does look like an exponential curve till 1 volt, beyond that the curve is not linear.
My question is, why are the graphs not similar? Or is there any fault with the values I have chosen or any fault in my comparison?View attachment 80248
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