SPICE modeling of a JFET from Datasheet

from the table below, we get that CGD is 3.499pF, while M and DB can be set to their default values, 0.5 and 1.0 V:

The fifth graph is about input capacitance Ciss:

let’s report values in the table and extract the value of CGS:


Get CGS about 3.34 pF:

From the fifth and sixth table we can obtain various parameters including IS, ISR, NR, ALPHA and VK.We need this graph from datasheet:

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