FREQUENCY OFFSET IMAGE REJECTION

摘要

An approach for providing image rejection during signal down conversion involves phase shifting quadrature signals at a frequency other than the down converted center frequency. One or more phase shifters coupled to a summer/subtractor provide forty five (45) degrees and one hundred thirty five (135) degrees of phase shift with respect to two quadrature input signals. The one or more phase shifters perform the phase shifts of the quadrature input signals at a frequency other than the center frequency of the down-converted signal.