Patent ID: 9112596
Filing Date: 2015-08-18
Classification: H03F,H04B

Abstract:
1. A method for calibrating a transmitter comprising a power amplifier in operative association with a variable supply voltage, the method comprising: determining a phase distortion of the power amplifier at a given instantaneous power by comparing a measurement of a signal supplied prior to the power amplifier to a measurement of a signal output from the power amplifier; and calibrating the transmitter on a basis of the determined phase distortion, wherein the determining comprises determining phase difference between time aligned samples of the signal supplied prior to the power amplifier and samples of the signal output from the power amplifier by at least: grouping the samples according to instantaneous power of each sample, the grouping of the samples including at least a group corresponding to the given instantaneous power, and calculating an average value of the determined phase difference such that the determined phase distortion is determined on a basis of the samples in said group.