High efficiency linearization power amplifier for wireless communication

A predistortion system for linearizing an output of a power amplifier, the predistortion system comprising:

• a first input operable to receive an analog RF modulated signal;
• a second input operable to receive a feedback signal representative of nonlinear characteristics of a power amplifier;
• a predistortion controller, comprising at least one lookup table, adapted to receive a digitized version of the analog RF modulated signal and a digitized version of the feedback signal and to generate a correction factor for correcting the nonlinear characteristics of the power amplifier;
• combining logic which combines the analog RF modulated signal with a signal corresponding to the correction factor and supplies it to the power amplifier to linearize the output of the power amplifier;
• a first A-to-D converter coupled to the analog RF modulated signal and operable to generate a first quadrature signal;
• and
• a second A-to-D converter coupled to the feedback signal and operable to generate a second quadrature signal, wherein the correction factor is equal to the square of the first quadrature signal minus the square of the second quadrature signal.