n-Channel JFET Linear Region I–V Calculator

Calculate the drain current \(I_D\) of an n-channel JFET operating in the linear (ohmic) region.

* Ensure that \(V_{GS} > V_P\) and \(V_{DS} < (V_{GS} - V_P)\). Please enter voltages with their proper signs.

Step 1: Enter JFET Parameters

Drain-Source Saturation Current, \(I_{DSS}\) (A)

e.g., \(5 \times 10^{-3}\) A

Gate-to-Source Voltage, \(V_{GS}\) (V)

e.g., -2.5 V (enter negative value)

Pinch-off Voltage, \(V_P\) (V)

e.g., -4 V (negative)

Drain-to-Source Voltage, \(V_{DS}\) (V)

e.g., 0.5 V (small value, and must be < \(|V_{GS} – V_P|\))

Process Parameter, \(k’\) (A/V²)

e.g., 0.001 A/V²

\(W/L\) Ratio

Dimensionless (e.g., 10)

Calculated Drain Current