![]() As a result, they are usually used for on/off switching applications where they are turned on and off quickly. They also don’t have a well defined linear region like NPN/BJT transistors do. Since a MOSFET based circuit only requires there to be a voltage applied, they tend to be easier to implement. ![]() This is in contrast to a BJT/NPN which needs a current flow to conduct. A MOSFET gate essentially acts as a capacitor, that when charged, allows the source and drain to conduct. The fundamental difference between MOSFETs and a BJT/NPN transistor is that a MOSFET turns on based on an applied voltage instead of current. I intend to focus more on real-world applications and circuits using MOSFETs. There is a lot of great information available on the fundamentals of MOSFETs, so I will only briefly discuss that here. What about MOSFET Gate Resistors in the Circuit?.
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