LO leakage suppression in frequency conversion circuits

A method of suppressing a local oscillator (LO) leakage signal having a first leakage basis vector and a second leakage basis vector in a frequency conversion circuit, the method comprising:

• calibrating a first actuator electrically coupled to a differential signal input associated with a transconductance stage of the frequency conversion circuit, wherein calibrating a first actuator adjusts a first basis vector associated with a differential output of the transconductance stage;
• calibrating a second actuator electrically coupled to receive the differential current output of the transconductance stage and electrically coupled to a set of commutating devices of the frequency conversion circuit, the commutating devices configured to receive differential LO inputs, wherein calibrating a second actuator adjusts a second basis vector associated with a differential impedance of the set of commutating devices;
• and
• offsetting at least partially, responsive to adjusting the first basis vector and the second basis vector, the first leakage basis vector and second leakage basis vector of the LO leakage signal.

A system for suppressing a local oscillator (LO) leakage signal, having a first leakage basis vector and a second leakage basis vector, in a mixed output of a frequency conversion circuit, the system comprising:

• a frequency conversion circuit configured to receive a differential signal input and a differential LO input, wherein the frequency conversion circuit configures the differential signal input and the differential LO input to generate the mixed output having a LO leakage signal and a desired signal, the frequency conversion circuit further comprising:
• a first actuator configured within the frequency conversion circuit, wherein the first actuator is configured to adjust a first basis vector of the frequency conversion circuit, to, at least partially, offset the first leakage basis vector of the LO leakage signal;
• and
• a second actuator configured within the frequency conversion circuit, wherein the second actuator is configured to adjust a second basis vector of the frequency conversion circuit to, at least partially, offset the second leakage basis vector of the LO leakage signal;
• a detector coupled to measure the first leakage basis vector and the second leakage basis vector of the frequency conversion circuit;
• and
• a calibration module electrically coupled to receive the first leakage basis vector and the second leakage basis vector of the LO leakage signal measured by the detector, wherein the calibration module is electrically coupled to calibrate the first actuator and the second actuator to offset the first leakage basis vector and the second leakage basis vector, respectively.

A system for suppressing a local oscillator (LO) leakage signal, having a first leakage basis vector and a second leakage basis vector, in a mixed output of a frequency conversion circuit, the system comprising:

• a frequency conversion circuit configured to receive a differential signal input and a differential LO input, wherein the frequency conversion circuit configures the differential signal input and the differential LO input to generate the mixed output having a LO leakage signal and a desired signal, the frequency conversion circuit further comprising:
• a first actuator configured within the frequency conversion circuit, wherein the first actuator is configured to adjust a first basis vector of the frequency conversion circuit, to, at least partially, offset the first leakage basis vector of the LO leakage signal;
• a second actuator configured within the frequency conversion circuit, wherein the second actuator is configured to adjust a second basis vector of the frequency conversion circuit to, at least partially, offset the second leakage basis vector of the LO leakage signal;
• and
• a calibration module electrically coupled to receive the first leakage basis vector and the second leakage basis vector of the LO leakage signal, wherein the calibration module is electrically coupled to calibrate the first actuator and the second actuator to offset the first leakage basis vector and the second leakage basis vector, respectively.