Reciprocal mixing noise cancellation in the presence of a modulated blocker

摘要

A method for reciprocal-mixing noise cancellation may include receiving, from a first mixer, a first signal comprising a wanted signal at a first frequency and a modulated signal at a second frequency. The modulated signal may be a product of a reciprocal-mixing of an unwanted signal with a phase noise. One or more portions of the modulated signal may overlap the wanted signal, adding a reciprocal-mixing noise to the wanted signal. A second signal may be generated by mixing, at a second mixer, the first signal with a third signal, which is at a third frequency related to a blocker offset frequency. A gain may be applied to the second signal to generate an amplified second signal that may be subtracted from the first signal to generate a fourth signal. The fourth signal may be filtered to generate the wanted signal at the first frequency without the reciprocal-mixing noise.

主权项

1. 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 by mixing at a second mixer the first signal with a third signal, the third signal being a narrow signal at a third frequency, wherein the third frequency is related to a blocker offset frequency; applying a gain to the second signal to generate an amplified second signal; subtracting the amplified second signal from the first signal to generate a fourth signal; and filtering the fourth signal to remove a reciprocal-mixing noise and generating the wanted signal at the first frequency without the reciprocal-mixing noise.