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RF power amplifier
A radio frequency power amplifier is a type of electronic amplifier used to convert a low-power radio-frequency signal into a larger signal of significant power, typically for driving the antenna of a transmitter. It is usually optimized to have high efficiency, high output Power(P1dB) compression, good return loss on the input and output, good gain, and optimum heat dissipation.
RF amplifiers formerly were all made used vacuum tubes (called ''valves'' in some English-speaking countries). Tubes are still used for exceptionally high-power transmissions (see Valve RF amplifier). Many modern RF amplifiers of over 1000 Watts〔
〕 are solid state using various classes, class A (in various forms, Class AB, AB1, etc.), class B, class C and class E. Class D amplifiers are rarely used for RF purposed, as it would require an even higher frequency device to be used. Solid state devices used in these solid state RF amplifiers are MOSFET, TMOS-FET, Bipolar junction transistors, and IGBT.
==Applications==
The basic applications of the RF power amplifier include driving to another high power source, driving a transmitting antenna and exciting microwave cavity resonators. Among these applications, driving transmitter antennas is most well known. The transmitter–receivers are used not only for voice and data communication but also for weather sensing (in the form of a radar).
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