Rf power amplifier

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An RF power amplifier is a device used to take a small input signal and convert it into a larger output signal. 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.

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}

Vbr is defined as the breakdown voltage

Vk is defined as the knee voltage

and Z_o = 50\Omega\,


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