The enhancement mode N-Channel MOSFET, where the switch between the "source" and "drain" is usually off. As of 2008, it is possible to fit 2,000,000,000 transistors on a single integrated circuit. An electric signal is sent to the gate, which creates an electric field that alters the connection between the "source" and "drain".Īlmost all MOSFETs are used in integrated circuits. FET describes the action of the gate on the semiconductor. MOS refers to the fact that a MOSFET is built by layering metal (the "gate") on oxide (an insulator which prevents the flow of electricity) on semiconductor (the "source" and "drain"). The name MOSFET describes the structure and the function of the transistor. Think of a MOSFET in place of the light switch: the switch itself is the "gate", the "source" is the power coming into the house, and the "drain" is the light bulb. Think of a dimmable light switch: the knob itself selects 'ON', 'OFF', or somewhere in between, controlling the brightness of the light. Said another way, the gate acts as a switch that controls the two outputs. They have one input connection (the "gate") which is used to control the flow of electricity between two other connections (the "source" and "drain"). A few MOSFETs amplify or process analog signals but most are used in digital electronics. Transistors are small electrical devices that are used in radios, calculators, and, perhaps most famously, computers they are some of the most basic building blocks of modern electronic systems. It is an electronic component that acts as an electrically controlled switch. MOSFET stands for metal-oxide-semiconductor field-effect transistor.
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