RF transmitter and method therefor

摘要

A radio frequency (RF) transmitter (200, 400) has at least one digital signal processing module (210, 410) and at least one power amplifier module (230). The digital signal processing module (210, 410) includes at least one digital pre-distortion component (250) arranged to receive at least one complex input signal, perform two-dimensional non-uniform mapping of the complex input signal to a first, in-phase, digital pre-distortion control word and a further, quadrature, digital pre-distortion control word, and output the in-phase and quadrature pre-distortion digital control words. The power amplifier module (230) includes a first, in-phase, array of switch-mode power cells (510) and at least one further, quadrature, array of switch-mode power cells (520). The two-dimensional non-uniform mapping has a pre-distortion profile (350) at least partly based on an input/output relationship for the power amplifier module (230) arranged to generate an analogue RF signal based at least partly on the in-phase and quadrature digital pre-distortion control words.