MOSFET Drain–Gate RD Calculator

MOSFET Drain–Gate RD Calculator

Find the drain resistor \(R_D\) required to achieve a desired output voltage \(V_{out}\) in a diode-connected MOSFET.

Step 1: Enter Circuit Parameters

Example: 5 V

\(V_{out}\) should be greater than \(V_{TH}\)

Example: 1 V

Example: 0.001 A/V²

Dimensionless

Circuit Equation: $$ \frac{V_{DD} – V_{out}}{R_D} = \frac{1}{2} k’\frac{W}{L}(V_{out} – V_{TH})^2 $$

Therefore, $$ R_D = \frac{V_{DD} – V_{out}}{\frac{1}{2} k’\frac{W}{L}(V_{out} – V_{TH})^2} $$