MOSFET Drain–Gate RD from Iout Calculator

MOSFET Drain–Gate RD from Iout Calculator

Calculate the required drain resistor \(R_D\) from the desired output voltage and current.

Step 1: Enter Circuit Parameters

Example: 5 V

Example: 3 V (must be less than \(V_{DD}\))

Example: \(1 \times 10^{-3}\) A (1 mA)

Circuit Equation: $$ I_{out} = \frac{V_{DD} – V_{out}}{R_D} $$

Rearranged: $$ R_D = \frac{V_{DD} – V_{out}}{I_{out}} $$