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<p class="MsoNormal"><strong><span lang="EN-US">What is radio frequency power amplifier?</span></strong></p> <p class="MsoNormal"><span lang="EN-US">The <a href="https://lcantennas.com/overview-of-radio-frequency-power-amplifier/">radio frequency power amplifier</a> (<a href="https://lcantennas.com/product-category/antenna-accessories/amplifiers-and-repeaters/">RF Power Amplifier</a> or RF PA) is the main part of the transmitting system, and its importance is self-evident.</span></p> <p class="MsoNormal"><span lang="EN-US">In the pre-stage circuit of the transmitter, the RF signal power generated by the modulation oscillator circuit is very small, and it needs to go through a series of amplification (buffer stage, intermediate amplification stage, final power amplification stage) to obtain enough RF power before it can be fed Radiate to the <a href="https://lcantennas.com/products/">antenna</a>.</span></p> <p class="MsoNormal"><span lang="EN-US">In order to obtain a large enough radio frequency output power, a radio frequency power amplifier must be used. After the modulator generates the radio frequency signal, the radio frequency modulated signal is amplified to sufficient power by the radio frequency power amplifier, and then transmitted by the antenna through the matching network.</span></p> <p> </p> <p class="MsoNormal"><span lang="EN-US">The function of the amplifier is to amplify the input content and output it. The content of input and output, which we call signals, is often expressed as voltage or power.</span></p>