FDAC/2 spur estimation and correction

A transmitter comprising:

• an interleaving multiplexer operable to combine signals in two or more frequency bands, having an output;
• a spur sense chain, coupled to the output of the interleaving multiplexer;
• a correction controller coupled to the spur sense chain;
• and
• a Q path corrector coupled to the correction controller.

A transmit chain, comprising:

• a first digital-to-analog converter (DAC) having an input and an output;
• a second DAC having an input and an output;
• an interleaving multiplexer, coupled to the first DAC output and the second DAC output;
• a Q path corrector comprising:
• a first capacitor-switch array comprising a first terminal, a second terminal and a first plurality of capacitors and switches, each capacitor connected in series with one switch between the first and second terminals, the first terminal coupled to a first clock signal and the second terminal coupled to a transmit output;
• and
• a second capacitor-switch array comprising a third terminal, a fourth terminal and a second plurality of capacitors and switches, each capacitor connected in series with one switch between the third and fourth terminals, the third terminal coupled to the second clock signal and the fourth terminal coupled to transmit output;
• a spur sense chain, coupled to the transmit output;
• and
• a correction controller, coupled to the interleaving multiplexer and the spur sense chain.