Patent ID: 6782247
Filing Date: 2004-08-24
Classification: H03C,H03D

Abstract:
A frequency conversion circuit with sideband suppression comprising:(a) a first mixer for receiving an in-phase signal (IFi) and driven by a local oscillator having an in-phase oscillator signal (LOi), and producing sideband signals (LO+IFi, LOâˆ’IFi), (b) a second mixer for receiving a quadrature phase frequency signal (IFq) relative to the in-phase signal and driven by a local oscillator having a quadrature oscillator signal (LOq) relative to the in-phase oscillator signal, and producing two sidebands (LO+IFq, LOâˆ’IFq), one of the sidebands from the second mixer being 180Â° out of phase with respect to the same sideband from the first mixer, and (c) a signal combiner for receiving and combining the two sidebands in the first mixer and the two sidebands from the second mixer, the signal combiner suppressing one sideband and enhancing the other sideband.