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RF power amplifier

Amplifiers produce from an input signal, an output signal having an increased magnitude (i.e., gain). Essentially, an amplifier produces a constant output power at a higher level. Radio frequency (RF) power amplifiers are commonly used in numerous applications, such as base stations used in wireless communication systems. Modern wireless communication base stations transmit and receive radio frequency (RF) signals through the use of RF power amplifiers. RF power amplifiers are generally designed to provide maximum efficiency at the maximal output power. A typical radio transmitter uses a radio frequency (RF) power amplifier to amplify outbound signals for transmission by an antenna. A radio frequency power amplifier is typically constructed using a printed circuit board, with various components of the radio frequency power amplifier circuit installed on the printed circuit board. The RF amplifier circuit typically includes an input, an active element, a bias circuit element, an output matching network, and an output. RF power amplifiers characterized by a plurality of operating performance characteristics responsive to a quiescent operating point established by a direct current (DC) bias current. The linear power amplifier is driven by a direct current (DC) input voltage, provided for example by a battery in the transmitter, and the efficiency of the power amplifier is given by the ratio of the output power to the DC input power.

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