Patent ID: 7403751
Filing Date: 2008-07-22
Classification: H04B,H04L

Abstract:
1. A DC offset calibration system, comprising: a mixer that mixes a local signal and a RF interfering signal thus to output an IF signal; a DC offset corrector that detects a level of the RF interfering signal and outputs to the mixer a correction signal to correct a DC offset contained in the IF signal to thereby cancel the DC offset; a first and a second frequency synthesizers; a first frequency divider that divides the frequency of an output signal of the first frequency synthesizer to thereby generate the local signal and outputs the local signal to the mixer; and a second frequency divider that divides the frequency of an output signal of the second frequency synthesizer to thereby generate the RF interfering signal and outputs the RF interfering signal to the mixer; wherein the first frequency divider and the second frequency divider have different division ratios.