Quadrature mixer arrangement

Abstract

A quadrature mixer arrangement is disclosed, which is adapted to translate an input signal by a translation frequency. The mixer arrangement is operated at a clock rate that equals the translation frequency times an oversampling rate, wherein the oversampling rate is not a multiple of four. The mixer arrangement comprises a sequence generator, at least one pair of mixers, and one or more correction networks. The sequence generator generates an in-phase mixer translation sequence and a quadrature-phase mixer translation sequence based on the oversampling rate. The in-phase mixer translation sequence is a time-discrete representation of a translation frequency sinusoidal function sampled at the clock rate, and the quadrature-phase mixer translation sequence is a time-discrete representation of the translation frequency sinusoidal function phase-shifted by π/2 plus a phase deviation and sampled at the clock rate, wherein the phase deviation is a function of the oversampling rate. Each pair of mixers comprises an in-phase mixer and a quadrature-phase mixer, each adapted to translate a respective input signal based on the respective translation frequency. The one or more correction networks are adapted to, based on the oversampling rate and the phase deviation, compensate for the phase deviation by adjusting at least one of the in-phase mixer input signal, the quadrature-phase mixer input signal, the in-phase mixer output signal, and the quadrature-phase mixer output signal.