Patent ID: 7741906
Filing Date: 2010-06-22
Classification: H03F

Abstract:
1. A method of generating parameters for a predistortion circuit in an integrated circuit, the method comprising: receiving, at the predistortion circuit, an input signal to be amplified by a power amplifier; receiving an output of the power amplifier at an input of the integrated circuit; comparing an output of the predistortion circuit with the output of the power amplifier; conforming the output of the power amplifier with the output of the predistortion circuit; and generating parameters to be applied to the predistortion circuit based upon the conformed outputs of the power amplifier and the predistortion circuit; wherein conforming the output of the power amplifier with the output of the predistortion circuit comprises eliminating a frequency offset between the output of the predistortion circuit and the output of the power amplifier by determining a phase difference between the output of the predistortion circuit and the output of the power amplifier and generating an approximation of the phase difference, the approximation of the phase difference being generated by converting a trigonometric representation of the phase difference to an algebraic representation of the phase difference.