Method for reducing second order distortion in harmonic rejection mixer

摘要

The present invention relates to a method for reducing second order intermodulation distortion in a harmonic rejection mixer (1700) comprising a plurality of mixing means (1701-1704). Transistor mismatch is compensated in a first (1701) and a second (1703) mixing means of said plurality. The applied radio frequency signal is down-converted with a plurality of local oscillator signals. The down-converted signals are amplified with a phase-dependent amplification factor and recombined to obtain an in-phase and a quadrature baseband signal. In the recombination of the in-phase baseband signal an amplification factor of zero is given to the first down-converted compensated signal (1721) from said first mixing means and in the recombination of the quadrature baseband signal an amplification factor of zero is given to the second down-converted compensated signal (1723) from said second mixing means.