RF power transistors are used whenever an electromagnetic signal needs to
be amplified and transmitted from an antenna.
RF transistors are designed
to handle high-power radio frequency (RF) signals in devices such as stereo
amplifiers, radio transmitters, and television monitors, television broadcatsing.
Like other semiconductor devices, they are made of materials such as silicon
(Si) or germanium (Ge) and doped with impurities to induce changes in electrical
properties. There are several basic types of RF transistors. Bipolar RF transistors
consist of an N-type or P-type layer sandwiched between two layers of the
opposite type. Both NPN and PNP configurations are available. MOSFET RF transistors
are metal-oxide field effect transistors (MOSFETs) with a channel made of
either an N-type or P-type material. Heterojunction field effect transistors
(HFETs) require a negative power supply and are used mainly for driver or
power amplification applications. Pseudomorphic high electron mobility transistors
(PHEMTs) are used mainly in wireless devices and satellite communication systems.
The transistor was developed at Bell Laboratories in 1948. Large scale commercial
use didn't come until much later owing to slow development. Transistors used
in most early entertainment equipment were the germanium types. When the silicon
transistor was developed it took off dramatically. The first advantages of
the transistor were relatively low power consumption at low voltage levels
which made large scale production of portable entertainment devices feasible.
RF transistor falls under a variegation of technologies that have been developed
over recent years. The different technologies that are available from RF power
transistor suppliers come with different advantage and disadvantages, depending
on the power levels and frequency ranges of your applications. Thus, makers
of RF power transistor continue to make many different types. Generally transistors
fall into the category of bipolar transistor, either the more common NPN bipolar
transistors or the less common PNP transistor types. There is a further type
known as a FET transistor which is an inherently high input impedance transistor
with behaviour somewhat comparable to valves. Modern field effect transistors
or FET's including JFETS and MOSFETS.
Some of the most common types of RF transistors include metal oxide semiconductor
field effect transistors (MOSFET), laterally diffused metal oxide semiconductor
(LDMOS), gallium arsenide (GaAs) and bipolar junction transistors (BJT). Different
RF power transistor manufacturers focus on different types of devices.
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Learn more about RF Transistors
* Advance study and reference RF
transistor
* Basics of RF network analyser
* More RF reference
* e book RF transistor
Amba Trading Company is in sale of wide range of RF transistor
used in broadcasting television FM radio -
RF Transistors for Broadcasting -
We are authorized representative of India for - P1dB(U.S.A.)
RF Transistors of a wide variety used in radio and television
Industry with brand name of P1dB.