Patent ID: 7190735

Claim:
Method of generating first and second output signals (I, Q) corresponding to an input signal A having a fundamental frequency ω 1 , said output signals (I, Q) having a 90° phase difference with respect to each other, the method comprising: providing a predetermined number of first Fourier components A 2n+1 (ω 2n+1 ), n=0, 2, 4, . . . , of the input signal (A), wherein ω 2n+1 =(2n+1)·ω 1 ; exerting a 90° phase shift in a first direction on said first Fourier components; providing a predetermined number of second Fourier components A 2n+1 (ω 2n+1 ), n=1, 3, 5, . . . of the input signal (A); exerting a 90° phase shift in the opposite direction on said second Fourier components; combining said predetermined number of first Fourier components and said predetermined number of second Fourier components to provide said first output signal I; and combining the thus shifted first and second Fourier components to provide said second output signal Q.