Harmonic reject receiver architecture and mixer

  • US 8,374,569 B2
  • Filed: 08/07/2012
  • Issued: 02/12/2013
  • Est. Priority Date: 12/10/2004
  • Status: Active Grant
First Claim
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1. A harmonic reject mixer comprising:

  • a plurality of mixers, each mixer having a common radio frequency (RF) input;

    a generator operable to generate a common local oscillation (LO) input signal;

    a phase shifter having an input coupled to receive the common LO input signal and being operable to generate a plurality of phase shifted output signals based on the common LO input signal, the common LO input signal comprising a plurality of transitions during a period of each phase shifted output signal, wherein each of the plurality of phase shifted output signals is generated according to a respective transition of the plurality of transitions of the common LO input signal, where each distinct transition in the plurality of transitions corresponds to a phase of each phase shifted output signal in the plurality of phase shifted output signals and each of the phase shifted output signals is coupled to a LO input of a corresponding mixer of the plurality of mixers; and

    a combiner having a plurality of inputs, each input coupled to an output of an associated mixer of the plurality of mixers, and configured to provide a combined intermediate frequency (IF) output.

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