I am trying to figure out the drain voltage of the JFET (N type depletion) ATF33143, given the architecture shown in the image below.

I understand that it's basically a voltage divider and that \$ V_{out} = I_D R_{JFET}\$, where \$ R_{JFET} \$ is a function of \$ V_G \$.

In the datasheet for the JFET, there is \$ I_{ds}\$ vs \$V_{ds} \$ for various \$V_G\$ values.

I am trying to figure out the voltage output fluctuation as a function of the fluctuation in \$ V_{G}\$.

Is there a simple equation to represent such a relation?

enter image description here

  • \$\begingroup\$ JFETs have a square law dependency between V(gate,channel) and the Drain current. \$\endgroup\$ – analogsystemsrf Sep 3 '18 at 21:55

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