Patent ID: 7129777

Claim:
A digital feedback linearizing apparatus to linearize a lower amplifier used in a mobile communication base station, the digital feedback linearizing apparatus comprising: a power amplifier input/output signal subtracting means, which generates a difference between an input signal and an output signal of the power amplifier; an inverse distorted feedback signal extracting means, which extracts an inverse distorted feedback signal (e(t)) corresponding to an input signal (x(t)) input to the digital feedback linearizing apparatus through a predetermined path based on the output signal of the power amplifier input/output signal subtracting means and the input signal (x(t)); and a signal adding means, which generates a predistorted signal (u(t)) input to the power amplifier by adding the inverse distorted feedback signal (e(t)) to the input signal (x(t)), wherein the power amplifier is linearized using the predistorted signal (u(t)) as an input signal of the power amplifier, and wherein the inverse distorted feedback signal extracting means comprises a look-up table composed of signal values that are quantized corresponding to the amplitude of the input signal (x(t)), which gradually increases by a predetermined unit.