How can the characteristics of a field-effect transistor (FET) in a RADAR switching power supply be compared?

The characteristics of a field-effect transistor (FET) in a RADAR switching power supply can be accurately described by comparing its "On" state to a pure resistor and its "Off" state to a mechanical relay because of the distinct behaviors these components exhibit.

In the "On" state, a FET allows current to flow with a low resistance, akin to a pure resistor. This results in minimal voltage drop across the FET and allows for efficient power transfer and fast switching capabilities. Just like a resistor, which allows current to pass with some resistance depending on its value, the FET in this state provides an efficient path for current flow.

In the "Off" state, the FET stops conducting nearly all current, acting similarly to a mechanical relay, which is an electromechanical switch. A mechanical relay physically opens and closes a circuit, providing high resistance (essentially an open circuit) when it is not activated, which prevents current from flowing through. The FET, when in the "Off" state, essentially behaves as an ideal switch that prevents current flow, similar to how a relay would function when open.

This comparison highlights both the efficiency and performance of FETs in switching applications, particularly in environments like RADAR systems