Mosfet Gate Current Limiting Resistor. Gate current limiting slows down mosfet switching time according to the gate charge see mosfet datasheet. Not only do mosfets not have bases they have gates but the gate is very high impedance.
Mosfet gate is purely capacitive load gate current will be limited by the driver and preferably by an additional series resistor. External gate resistor rgate 0 ω at 0 ω there is unwanted ringing on the gate source waveform. Mosfet or igbt s internal gate resistance is large enough.
A mosfet gate acts like a capacitor as seen from the arduino output pin in that it only draws current to charge to turn on or dischage to turn off the gate capacitance.
Sometimes a gate resistor is prudent to reduce ringing especially if the trace driving the gate is long or if you are concerned with generating electromagnetic interference. External gate resistor rgate 0 ω at 0 ω there is unwanted ringing on the gate source waveform. You can see the effect of the gate current limitation on the rise and fall times as well as the delay. The main purpose of a series gate resistor on a mosfet is to limit the current peaks the arduino output pin has to supply to the gate.
