Patent ID: 8908746

Claim:
A communications device comprising: a plurality of wireless transmitters operable at different respective frequencies and each configured to generate respective IQ signals having an initial IQ imbalance; a switching block coupled to each of the plurality of wireless transmitters; an auxiliary receiver coupled to a given wireless transmitter from among the plurality of wireless transmitters via said switching block, said auxiliary receiver comprising a low noise amplifier (LNA), at least one mixer coupled downstream of said LNA, and a receiver phase locked loop (RXPLL) coupled to said at least one mixer; a plurality of non-directional couplers each between said RXPLL and a respective one of the plurality of wireless transmitters; and a controller configured to apply predistortion to each wireless transmitter of the plurality thereof based upon the initial IQ imbalance generated by the given wireless transmitter from among the plurality of wireless transmitters to reduce the initial IQ imbalance in each wireless transmitter.