Patent ID: 6711217
Filing Date: 2004-03-23
Classification: H03F

Abstract:
An apparatus for eliminating an amplified distortion signal component from the output of a non-linear power amplifier, comprising:a baseband linearization arrangement for generating and modulating to radio frequency (RF) a predistorted signal before said predistorted signal is fed to said power amplifier to produce an RF amplified distortion signal, said predistorted signal being generated by demodulating said RF amplified distortion signal to produce a demodulated distortion signal and then comparing said demodulated distortion signal with said predistorted signal; and a carrierband amplification arrangement, including said power amplifier, for amplifying the modulated predistorted signal from said baseband arrangement to linearize a resulting RF amplified distortion signal, and for further linearizing said RF amplified distortion signal by comparing said RF amplified distortion signal with a delayed modulated predistorted signal to obtain an error signal, amplifying said error signal to produce an amplified error signal, and subtracting said amplified error signal from said RF amplified distortion signal.