Patent ID: 7636562
Filing Date: 2009-12-22
Classification: H03D

Abstract:
1. A circuit, comprising: a first mixer capable of receiving an in-phase radio frequency signal and an in-phase reference signal and generating a first intermediate frequency signal, the first intermediate frequency signal comprising a first leakage signal, wherein a frequency of the in-phase reference signal is approximately one-half of a frequency of the in-phase radio frequency signal, and a frequency of the first intermediate frequency signal is approximately one-half of the frequency of the in-phase radio frequency signal; a second mixer capable of receiving an out-of-phase radio frequency signal and an out-of-phase reference signal and generating a second intermediate frequency signal, the second intermediate frequency signal comprising a second leakage signal; a signal combiner capable of receiving the first and second intermediate frequency signals and generating a composite intermediate frequency signal, the composite intermediate frequency signal comprising an output leakage signal that is less than either of the first and second leakage signals; a filter capable of receiving the composite intermediate frequency signal and generating a filtered composite intermediate frequency signal; a third mixer capable receiving the filtered composite intermediate frequency signal and a local oscillation signal and generating a baseband signal with a direct current component; and a second signal combiner capable of receiving the baseband signal and a direct current cancellation signal and at least partially reducing the direct current component in the baseband signal.