SPICE modeling of a JFET from Datasheet

from the datasheet we get the pairs of values, (for active leakage we have to specify Id value):



We get the following values: IS= 1.601 e-014, ISR = 1.601 e-013, NR= 2.029, ALPHA = 0.0564 V^-1, VK=229.66 V:

Finally we look at the last chart from the datasheet that shows voltage noise as a function of frequency:

Introduce data in the last table and find KF and AF values:


It’s KF = 7.95 e-018 and AF = 0611:

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