Patent ID: 8995571
Filing Date: 2015-03-31
Classification: H03F,H04L

Abstract:
1. An amplifier, comprising: a predistorter receiving an input signal; a first converter receiving an output of the predistorter to generate a preamplified signal; a power amplifier receiving the preamplified signal to generate an output signal based on the preamplified signal; and a second converter sampling the output signal to generate a feedback signal; wherein the predistorter, based upon an in-phase component of the input signal and the feedback signal, introduces a first component of the predistortion signal corresponding to the in-phase component of the input signal, and the predistorter, based upon a quadrature component of the input signal and the feedback signal, introduces a second component of the predistortion signal corresponding to the quadrature component of the input signal; wherein the predistorter compensates for nonlinearities in the in-phase component and the quadrature component by separately and independently applying a first set of coefficients to the in-phase component and a second set of coefficients to the quadrature-phase component, the first and second sets of coefficients being different from each other.