MOSFETs exhibit high input impedance, making them versatile and adaptable to various applications.MOSFETs have very high input impedance, which means almost anything can drive them.However, with a MOSFET, simply apply enough voltage to the gate, and the switch operates. When using a BJT, the base resistor must be carefully calculated based on the current being switched. MOSFETs are voltage-controlled, while BJTs are current-controlled.To sum up the distinctions between BJTs and MOSFETs: This property makes FETs ideal for handling large current flows, and MOSFETs are commonly employed as switches. In essence, the gate-source voltage applied to a FET controls the electrical field across a channel, similar to pinching or opening a straw to stop or permit current flow. However, when you apply voltage to the gate-source, the drain-source resistance decreases, allowing current to flow through the now-closed circuit. When no voltage is applied between the gate and source, the drain-source resistance is incredibly high-almost like an open circuit-preventing current from flowing. Think of a MOSFET as a variable resistor, where the voltage difference between the gate and source determines the resistance between the drain and source. By applying voltage to the gate, you create an electrical field that controls the current flow through the channel between the drain and source, without any current flowing from the gate into the MOSFET itself. The MOSFET has 3 terminals, “ gate“, “d rain” and “ source“, differs from BJT which has “base”, “collector”, and “emitter” terminals. Unlike a bipolar junction transistor (BJT) that operates based on current control, MOSFETs are voltage-controlled devices. MOSFET, short for metal-oxide-semiconductor field-effect transistor, is a unique type of field-effect transistor (FET). A Simplified Explanation of How MOSFETs Work.Understanding Different Types of MOSFETs.
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