Rotating harmonic rejection mixer

摘要

In one embodiment, the present invention includes a mixer circuit to receive and generate a mixed signal from a radio frequency (RF) signal and a master clock signal, a switch stage coupled to an output of the mixer circuit to rotatingly switch the mixed signal to multiple gain stages coupled to the switch stage, and a combiner to combine an output of the gain stages.

主权项

1. An apparatus comprising:
a low noise amplifier (LNA) to receive a radio frequency (RF) signal; a voltage controlled oscillator (VCO) to generate a VCO frequency; a frequency divider to divide the VCO frequency to obtain a master clock signal corresponding to a local oscillator (LO) multiplied by N/2, wherein N corresponds to a number of mixer loads; a master RF device coupled to the LNA to receive the RF signal and provide an RF current, the master RF device having at least one transconductor; a master LO device coupled to an output of the master RF device, the master LO device to receive the RF current and mix the RF current with the master clock signal to obtain a mixed signal; a rotating switch device coupled to the master LO device and including N rotating switches each to cyclically switch the mixed signal to one of a plurality of output ports of the rotating switch device; N mixer loads each coupled to one of the plurality of output ports, each of the N mixer loads to perform gaining and filtering of the mixed signal; a plurality of gain stages each coupled to one of the N mixer loads to weight the output of the corresponding mixer load and to provide an output to a summer; and the summer to combine outputs of the plurality of gain stages.