Patent ID: 7170346

Claim:
A system for reducing non-linear distortion in an amplifier output signal, comprising: a main branch comprising a first amplifier and a first adder, the first adder having an output and first and second inputs, the first amplifier receiving an amplifier input signal, the first amplifier supplying a non-linear distorted signal to the first input of the first adder, the output of the first adder forming the amplifier output signal; an auxiliary branch comprising: a second adder having an output and positive and negative inputs, the positive input of the second adder receiving a time delayed version of the amplifier input signal, the negative input of the second adder receiving the non-linear distorted signal of the first amplifier; an error signal device receiving a signal from the output of the second adder, the error signal device forming an error signal, which is supplied to the second input of the first adder, the error signal device comprising: at least one transmission device with a negative group delay time; and at least one amplifier with a positive group delay time, the error signal device having a collective group delay time dimensioned such that non-linear distortions are minimized for the amplifier output signal by adding the error signal and the non-linear distorted signal wherein the main branch is formed without a delay element such that the non-linear distorted signal of the main branch arrives at the first input of the first adder with essentially no delay.