Leakage signal cancellation

A system comprising:

• a waveform generator to generate a source signal for wireless transmission from at least one antenna;
• receive path circuitry coupled to receive an ingoing radio frequency (RF) signal that is a reflection of the source signal from an object and configured to process the ingoing RF signal, the receive path circuitry comprising:
• a mixer coupled to receive the ingoing RF signal and a high frequency signal from the waveform generator, wherein the mixer produces a down converted mixer output signal;
• an analog-to-digital converter that produces a digital mixer output signal that is based upon the down converted mixer output signal;
• subtraction circuitry disposed electrically between the mixer and the analog-to-digital converter to subtract a leakage cancellation signal from the down converted mixer output signal;
• a digital to analog converter configured to produce the leakage cancellation signal to the subtraction circuitry;
• a first switch configured to selectively couple, based on a control signal, one of the down converted mixer output signal or ground to the subtraction circuitry;
• and
• a second switch configured to selectively couple, based on a second control signal, one of the leakage cancellation signal or ground to the subtraction circuitry.