What is MOSFET ?
MOSFET is a modern semiconductor component ,basically used in digital and power electronics . It has four parts gate,source,body & drain but externally it only have 3 terminals gate ,source and drain . In normal transistor base controls the flow of electron through emitter and collector . Likewise in mosfet gate terminal controls the flow of current through drain and source . The main reason of using MOSFET in modern electronics instead of other transistor is it consume very little power and the dissipation of power in terms of loss is very llittle, which makes it a major component in the modern computers and electronic devices like the cell phones, digital watches, small robotic toys and calculators.
Doping in MOSFET
MOSFET transistors are made up of silicon alloy with germanium so that it possesses both the properties of silicon and germanium. Doping is the process of adding some impurities to the semiconducting material so that the properties of the material is altered and by the process of doping certain small impurities are added with the above mentioned semi conducting materials so that its properties can be altered to suit our requirements and the common impurities added are the boron, phosphorus, arsenic and gallium.
MOSFET as an amplifier