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| {{Distinguish|Audio power amplifier}}
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| {{Unreferenced|date=September 2007}}
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| [[File:Graduate School Project (2870679632).jpg|thumb|right|An RF power amplifier]] | |
| [[File:MFR317 FM amp.jpg|thumb|Class C VHF power amplifier based on the transistor MRF317.]] | |
| An '''RF power amplifier''' is a type of [[electronic amplifier]] used to convert a low-power radio-frequency [[Signal (electrical engineering)|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) [[Signal compression|compression]], good return loss on the input and output, good [[gain]], and optimum heat dissipation.
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| ==Applications==
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| The basic applications of the RF power amplifier include driving to another high power source, driving a transmitting [[Antenna (radio)|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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| ==Wideband amplifier design==
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| [[Electrical impedance|Impedance]] transformations over large [[Bandwidth (signal processing)|bandwidth]] are difficult to realize, thus most [[wideband]] [[amplifier]]s use 50 Ω output loading. [[Transistor]] output power is then limited to
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| :<math>P_{out} \le \frac{(V_{br} - V_k)^2}{8Z_o} </math>
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| <math>V_{br}</math> is defined as the breakdown voltage | |
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| <math>V_k</math> is defined as the knee voltage
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| and typically <math>Z_o = 50\Omega\,</math>
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| ==External links==
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| {{Commons cat|RF power amplifiers}}
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| *{{cite paper |url=http://cas.web.cern.ch/cas/Denmark-2010/Caspers/AN-GT101A-Microwave%20Power%20Amplifier%20Fundamentals%2008-10-27%20%20CAS2010.pdf |title=Microwave Power Amplifier Fundamentals |accessdate=2013-03-05 |author=Carlos Fuentes |date=October 2008}}
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| {{DEFAULTSORT:Rf Power Amplifier}}
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| [[Category:Electronic amplifiers]]
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| [[Category:Radio electronics]]
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| {{radio-comm-stub}}
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