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

     
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