Patent ID: 8295791

Claim:
A radio frequency (RF) front-end circuit connected to an antenna module, the RF front-end circuit comprising: a plurality of main transmission circuits, each operable to amplify original signals as first amplified signals, wherein the first amplified signals comprise non-linear distortion; an assistant transmission circuit operable to reduce the non-linear distortion in the first amplified signals; a signal coupling circuit coupled to the main transmission circuits, operable to sample the first amplified signals from the main transmission circuits to obtain sampling signals, wherein the assistant transmission circuit calculates the non-linear distortion in the first amplified signals according to the sampling signals and the original signals, and generates compensation signals according to the non-linear distortion, wherein the signal coupling circuit further feeds back the compensation signals to the main transmission circuits to reduce the non-linear distortion of the first amplified signals; and a switching module comprising a first switch operable to selectively connect the assistant transmission circuit to either the signal coupling circuit or the antenna module, wherein the assistant transmission circuit assists the plurality of main transmission circuits to reduce the non-linear distortion in the first amplified signals when the switching module connects the assistant transmission circuit to the coupling circuit.