Julia J Liu

US Patent:

20120269291, Oct 25, 2012

Filed:

Nov 16, 2011

Appl. No.:

13/298282

Inventors:

Hua Wang - San Francisco CA, US
Chao Lu - Fremont CA, US
Julia Liu - San Jose CA, US
Chun-Hsien Peng - Nantou County, TW
Sang Won Son - Palo Alto CA, US
Paul Cheng Po Liang - Hsinchu County, TW

International Classification:

H04L 25/49

US Classification:

375297

Abstract:

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