Patent ID: 9136989
Filing Date: 2015-09-15
Classification: H04L

Abstract:
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.