What is FET.
Fet (field effect transistor) is the second major type of transistor. the first major type is bjt (bipolar junction transistor).fets are uni polar devices because, unlike bjts that use electrons and loop currents, they operate only with one type of charge carrier.two main types of fets are junction field effect transistors (jfet) and field oxide semiconductor effect transistors (mosfet).
The term field-effect corresponds to the depletion region formed on the fet channel as a result of the voltage applied to one of its terminals (gates).
Bjt is the current controlled device; i.e, the base current controls the number of collector currents.the fetus is different. it is a voltage controlled device. the main advantage of fets is its very high input resistance. because their non-linear characteristics are not widely used as bjts except where very high input impedance is required. However, fets are the preferred devices in low voltage switching applications because they are generally faster than bjts when turned on and off.
Compared to bjts, fets are less noisy which means they have less voltage loss than bjts.
Field effect transistor –
It is a voltage-controlled device in which the current flows from the source terminal (equivalent to the emitter in a bipolar transistor) to a drain (equivalent to a collector). the applied voltage between the source terminals and the gate terminal (equivalent to the base) is used to control the source – the current flows.
Fet stands for field effect transistors .. field-effect transistors (fet) are transistors that use electric fields to control the shape and hence the electrical conductivity of a channel of one type of charge carrier in a semiconductor material. Fets are also known as uni polar transistors and because they involve the operation of a single carrier type. fet has several shapes, but they all have high input impedance. while the non-fet transistor conductivity is regulated by the input current (emitter to base current) and also has a low input impedance, the conductivity of the fetus is regulated by the applied voltage to the terminal (gate) isolated from the device. the applied gate voltage impels an electric field into the device, which in turn attracts or rejects the carrier’s charge to or from the region between the source terminal and the exhaust terminal. operator charge density in turn affects the conductivity between the source and the drain .. .
Field-effect transistors (fet) is a type of transistor commonly used for weak signal amplification (for example, to amplify wireless signals). the device can amplify analog or digital signals. it can also switch dc or function as oscillator.
