METHOD AND APPARATUS FOR REDUCING CARRIER LEAKAGE

摘要

In an embodiment, an apparatus comprises an in-phase-quadrature (IQ) signal amplifier having an IQ baseband input, an IQ mixer input connected to the IQ signal amplifier, a carrier leakage detector connected to outputs of the IQ mixer, and a carrier-null offset signal generator connected to the carrier leakage detector. The IQ mixer is configured to be driven by an IQ carrier signal. The carrier leakage detector is configured to output an in-phase leakage level measurement and a quadrature leakage level measurement in the absence of an IQ baseband signal at the IQ baseband input. The carrier-null offset signal generator is configured to (i) inject an in-phase carrier-null offset signal based on the in-phase leakage level measurement and (ii) inject a quadrature carrier-null offset signal based on the quadrature leakage level measurement.

主权项

1. An apparatus comprising:
an in-phase-quadrature (IQ) signal amplifier having an IQ baseband input; an IQ mixer connected to the IQ signal amplifier, and the IQ mixer configured to be driven by an IQ carrier signal; a carrier leakage detector connected to outputs of the IQ mixer, the carrier leakage detector configured to output an in-phase leakage level measurement and a quadrature leakage level measurement in the absence of an IQ baseband signal at the IQ baseband input; a carrier-null offset signal generator connected to the carrier leakage detector configured to inject an in-phase carrier-null offset signal based on the in-phase leakage level measurement and to inject a quadrature carrier-null offset signal based on the quadrature leakage level measurement.