Patent ID: 9647866
Date: 2017-05-09
CPC Classifications: H03F,H04B,H04L

Claim:
1. A radio frequency (RF) transmitter comprising: at least one digital signal processing module comprising: wherein the at least one digital pre-distortion component is arranged to: receive the at least one noise-shaped complex input signal comprising information to be transmitted over an RF interface, perform two-dimensional non-uniform mapping of the at least one received noise-shaped 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 digital pre-distortion control words; and at least one power amplifier module comprising a digital power amplifier (DPA) having a first, in-phase, array of switch-mode power cells and at least one further, quadrature, array of switch-mode power cells, wherein the first, in-phase digital pre-distortion control word and further, quadrature digital pre-distortion control word are arranged to drive the at least one power amplifier module to output an analog RF signal that represents the at least one noise-shaped complex input signal, and wherein two-dimensional non-uniform mapping comprises a pre-distortion profile that is generated at least partly according to an input/output relationship of the arrays of the switch mode power cells of the DPA to compensate non-linearities of the switch-mode power cells, wherein each of the switch-mode power cells is arranged to: