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.
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.