Patent ID: 8712361

Claim:
A method for reciprocal-mixing noise cancellation, the method comprising: receiving a first signal from a first mixer, the first signal comprising a wanted signal at a first frequency and a modulated signal at a second frequency, the modulated signal resulting from a reciprocal-mixing of an unwanted signal with a phase noise, wherein the second frequency is greater than the first frequency, and at least a portion of the modulated signal overlaps the wanted signal, adding a reciprocal-mixing noise to the wanted signal; generating a second signal using the first signal, the second signal being a narrow signal at a third frequency, wherein the third frequency is twice the second frequency; mixing, at a second mixer, the second signal with the first signal to generate a third signal; and subtracting the third signal from the first signal to remove a reciprocal-mixing noise and generate the wanted signal at the first frequency without the reciprocal-mixing noise.