Transistors are common semiconductor devices that are used as a building
block in a wide range of electronic devices. Transistors typically act as
amplifiers, though there are several other lesser known types. Below are listed
the types and their various functions and advantages.
Transistor - A field effect transistor, or FET, as it is referred to in
its classification, is also referred to as a unipolar transistor. The FET
consists of four terminals; source, gate, drain, and body. FETs are further
divided into two families which are junction FET (JFET) and insulated gate FET (IGFET).
IGFET, or more commonly know as MOSFET (metal-oxide-semiconductor FET), are
especially useful for high frequencies such as microwaves, up to several GHz.
Junction Transistors - Bipolar Junction Transistor (BJT) was the first
transistor to be massed produced. It consists of three terminals including
emitter, base, and collector. The p-n junctions of the terminals within the BJT
create an exponential relationship that gives BJT a much higher mutual
conductance than FET.
Unijunction - The Unijunction ; Transistor or UJT, has three
terminals Base 1 and Base 2, and the Emitter, yet only one junction, hence the
name. The PUT, or Programmable Unijunction Transistor, has an Anode and Cathode
connected to the junction layer and a gate. Though somewhat different than the
UJT, it does perform a similar function.
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