High efficiency linearization power amplifier for wireless communication
First Claim
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 digitized reference signal representative of an idealized reference signal;
a digitized feedback signal representative of nonlinear characteristics of the power amplifier;
a predistortion controller operable to square the digitized reference signal and the digitized feedback signal and to generate a predistortion correction signal; and
combining logic operable to combine the first input 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.
3 Assignments
0 Petitions
Accused Products
Abstract
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.
166 Citations
19 Claims
-
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 digitized reference signal representative of an idealized reference signal; a digitized feedback signal representative of nonlinear characteristics of the power amplifier; a predistortion controller operable to square the digitized reference signal and the digitized feedback signal and to generate a predistortion correction signal; and combining logic operable to combine the first input 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. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A method for linearizing the output of a power amplifier, the method comprising:
-
receiving an analog RF modulated signal at an input of a predistortion system; generating a digitized reference signal from an idealized reference signal; generating a digitized feedback signal from a feedback signal; generating a predistortion correction signal, wherein generating the predistortion correction signal includes squaring the digitized reference signal and the digitized feedback signal; combining the analog RF modulated signal with the predistortion correction signal to provide a predistortion signal; and receiving the predistortion signal at an input of the power amplifier. - View Dependent Claims (9, 10, 11, 12, 13)
-
-
14. A predistortion controller, comprising:
-
a lookup table, wherein the lookup table stores predistortion signals; an address former, wherein the address former provides an address to the lookup table; and an error generator; wherein the predistortion controller is configured to; receive an ideal signal, wherein the ideal signal is received at the address data former to provide an address to the lookup table; receive a feedback signal; square the ideal signal to generate a squared ideal signal, wherein the squared ideal signal is provided to the error generator; square the feedback signal to generate a squared feedback signal, wherein the squared feedback signal is provided to the error generator; generate an error signal by comparing the squared ideal signal and the squared feedback signal; and provide the error signal to the lookup table, wherein the lookup table produces a compensation value that compensates for time delay and nonlinearities of a power amplifier. - View Dependent Claims (15, 16, 17, 18, 19)
-
Specification