Methods and apparatuses for digital pre-distortion

A system, comprising:

• pre-distortion circuitry comprising an output;
• wherein the predistortion circuitry is configured to pre-distort at least two signals in different transmit bands;
• a digital to analog converter comprising an input coupled to the output of the pre-distortion circuitry, and an output;
• wherein the predistortion circuitry is further configured to skew a center frequency of a bandwidth in which pre-distortion is performed and which corresponds to includes one transmit band so that the a pre-distortion bandwidth covers corresponding uplink and downlink bands;
• wherein the pre-distortion of each of the at least two signals is based upon a portion of a corresponding power amplified, pre-distorted signal, and where wherein the pre-distortion diminishes certain intermodulation distortion (IMD) products in each of the power amplified, pre-distorted signals predistortion bandwidth;
• at least two power amplifier circuits, wherein each power amplifier circuit comprises an input and an output, and is configured to operate in a unique transmit band;
• wherein each input of each power amplifier circuit is coupled in parallel to the output of the digital to analog converter;
• wherein each output of each power amplifier circuit is coupled in parallel to one another;
• and
• wherein the at least two power amplifier circuits are configured to power amplify at least two pre-distorted signals each corresponding to a the unique transmit band.