High efficiency linearization power amplifier for wireless communication

摘要

A predistortion system for linearizing the output of a power amplifier includes a first signal representative of an RF modulated signal and a feedback signal representative of nonlinear characteristics of a power amplifier. The system also includes a predistortion controller, comprising at least one lookup table, adapted to receive the first signal and the feedback signal and to generate a correction factor for correcting the nonlinear characteristics of the power amplifier and combining logic which combines the 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.

主权项

1. A predistortion system for linearizing an output of a power amplifier, the predistortion system comprising:
a first input operable to receive a first input signal representative of an analog RF modulated signal; a second input operable to receive a second input signal representative of an idealized reference signal; a raw feedback path operable to receive a raw feedback signal representative of nonlinear characteristics of a power amplifier; a first down converter coupled to the second input and operable to produce a biased reference signal; a first analog-to-digital converter coupled to the first down converter and operable to produce a digitized reference signal; a second down converter coupled to the raw feedback path and operable to produce a biased feedback signal; a second analog-to-digital converter coupled to the second down converter and operable to produce a digitized feedback signal; a predistortion controller, comprising at least one lookup table, operable to receive the digitized reference signal and the digitized feedback signal and to generate a predistortion correction signal; and combining logic operable to combine the first signal and the predistortion correction signal and operable to produce a predistortion signal that is supplied to the power amplifier to linearize the output of the power amplifier.