Patent ID: 6377116
Filing Date: 2002-04-23
Classification: H03F

Abstract:
A method of deriving a corresponding pre-distorter to a non-linear amplifier, the non-linear amplifier having a topology comprising filter and non-linear amplifier elements, the method comprising the steps of:defining the pre-distorter's topology by: determining a corresponding inverse topology to the non-linear amplifier's topology, the inverse topology comprising corresponding inverse filter and amplifier elements to the amplifier's filter and non-linear amplifier elements; selecting each of the filter and non-linear amplifier elements for which compensation with the pre-distorter is desired; and removing from the inverse topology any of the inverse filter and amplifier elements corresponding to one of the filter and non-linear amplifier elements that was not identified so as to form the pre-distorter's topology, the pre-distorter's topology comprising each of the inverse filter and amplifier elements corresponding to one of the identified filter and non-linear elements; define the identified inverse filter and amplifier elements' responses by: applying an input signal to the non-linear amplifier and making measurements of selected signals of the non-linear amplifier; and estimating their respective sets of coefficients based on the measurements.