RF power amplifier

An RF 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 P1dB compression, good return loss on the input and output, good gain, and good heat dissipation.

Wideband amplifier design

Impedance transformations over large bandwidth are difficult to realize, thus most wideband amplifiers use 50 Ω output loading. Transistor output power is then limited to

:$Pout\; le\; frac\{(V\_\{br\}\; -\; V\_k)^2\}\{8Z\_o\}$

$V\{br\}$ is defined as the breakdown voltage

$V\_k$ is defined as the knee voltage

and $Z\_o\; =\; 50Omega,$