# drain voltage of JFET (N type depletion)

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?

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