Patent ID: 7486939

Claim:
A power amplifier, comprising: a non-linear low power pre-distortion amplifier for transforming a carrier signal to a pre-distorted signal having a carrier component with out-of phase non-linear distortions wherein the non-linear low power pre-distortion amplifier comprises: a first delay element for generating a first delayed carrier signal; a first attenuator coupled to the first delay element for generating an attenuated carrier signal; a first phase shifter coupled to the carrier signal for generating a phase- shifted carrier signal from the attenuated carrier signal; a first detector for controlling gain and phase of the first attenuator and the first phase shifter, respectively, according to desired characteristics of the phase shifted carrier signal; a first temperature and aging control adjuster coupled ot the first phase shifter for generating a phase bias signal that adjusts variations in phase as a function of temperature and aging a non-linear low power amplifier for generating from the carrier signal an amplified carrier component with non-linear distortions; a second attenuator coupled to the non-linear low power amplifier for generating an attenuated amplified carrier component with attenuated non-linear distortions; a second phase shifter coupled to the second attenuator for generating a phase-shifted signal having an out-of-phase attenuated carrier component with out-of phase attenuated non-linear distortions; and a second delay element for generating a second delayed carrier signal; a first combining point for combining the phase-shifted signal and the carrier signal, thereby generating a distortion signal having the out-of phase attenuated non-linear distortions, wherein the distortion signal generated from the combining the phase-shifted signal with the second delayed carrier signal; a second detector for controlling gain and phase of the second attenuator and the second phase shifter, respectively, according ot characteristics desired in the distortion signal; a second temperature and aging control adjuster coupled to the first attenuator for generating a bias signal that adjusts variations in gain as a function of temperature and aging, and a second combining point for generating the pre-distorted signal by combining the phase-shifted carrier signal and the distortion signal; and a non-linear power amplifier having non-linear characteristics similar to a portion of the non-linear low power pre-distortion amplifier for generating from the pre-distorted signal a transmission signal having an amplified carrier component with substantially diminished non-linear distortions.