Patent ID: 7821435

Claim:
A background calibration system for calibrating a non-linear distortion of an amplifier, comprising: a pseudo random number generator for generating a random signal and mixing said random signal with an input signal; an amplifier, coupled to said pseudo random number generator, for amplifying said input signal and said mixed random signal, and outputting an amplified signal; a backend analog-digital converter (ADC), coupled to said amplifier, for quantizing said amplified signal to generate a digital output signal; a nonlinearity compensation circuit, coupled to said backend ADC, for linearly transferring said digital output signal to generate a linear output signal; a parameter extractor for comparing said linear output signal from said nonlinearity compensation circuit and said digital output signal from said backend ADC to extract a calibrating parameter; and a non-linear coefficient detector for calculating a non-linear coefficient according to said calibrating parameter, and outputting said non-linear coefficient to said nonlinearity compensation circuit to perform a non-linear error compensation so as to accomplish said background calibration for said non-linear distortion of said amplifier.