Distortion in RF power amplifiers

This book is about nonlinear distortion in radio frequency (RF) power amplifiers (PAs). The purpose of the PA is to boost the radio signal to a sufficient power level for transmission through the air interface from the transmitter to the receiver. This may sound simple, but it involves solving several contradicting requirements, the most important of which are linearity and efficiency. Unfortunately, these requirements tend to be mutually exclusive, so that any improvement in linearity is usually achieved at the expense of efficiency, and vice versa.
To avoid interfering with other transmissions, the transmission must stay within its own radio channel. If the modulated carrier has amplitude variations, any nonlinearity in the amplifier causes spreading of the transmitted spectrum (so-called spectral regrowth). This effect can be reduced by using constant-envelope modulation techniques that unfortunately have quite low data rate/bandwidth ratio. When using more efficient digital modulation techniques, the only solution is to design the amplifiers linear enough. Distortion in RF power amplifiers

Từ khóa: Distortion in RF power amplifiers, radio frequency, radio channel, modulation techniques, khuếch đại công suất, tần số radio