Rf transmitter, integrated circuit device, wireless communication unit and method therefor

An integrated circuit device comprising:

• at least one digital signal processing module operably couplable to a power amplifier comprising a plurality of power amplifier cells, wherein the at least one digital signal processing module comprises:
• at least one digital pre-distortion component arranged to apply at least one digital pre-distortion codeword to the plurality of power amplifier cells, wherein the at least one digital pre-distortion codeword is applied to at least one of the plurality of power amplifier cells via a digital filter;
• and
• a combiner arranged to combine outputs of the plurality of power amplifier cells thereby generating an analogue RF signal for transmission over an RF interface based at least partly on the digitally filtered at least one digital pre-distortion codeword.

A method of generating a radio frequency signal for transmission over a radio frequency (RF) interface, the method comprising:

• generating at least one digital pre-distortion codeword;
• applying the at least one digital pre-distortion codeword to a plurality of power amplifier cells of a power amplifier, wherein the at least one digital pre-distortion codeword is applied to at least one of the plurality of power amplifier cells via a digital filter;
• and
• combining outputs of the plurality of power amplifier cells thereby generating an analogue RF signal for transmission over an RF interface based at least partly on the digitally filtered at least one digital pre-distortion codeword.

A radio frequency (RF) transmitter comprising:

• a power amplifier comprising a plurality of power amplifier cells;
• at least one digital signal processing module operably coupled to the power amplifier and comprising at least one digital pre-distortion component arranged to:
• interpolate a portion of at least one digital pre-distortion codeword, and
• output the portion of the at least one digital pre-distortion codeword to a portion of at least one power amplifier cell of the power amplifier thereby generating an analogue RF signal for transmission over the RF interface based at least partly on the interpolated portion of the at least one digital pre-distortion codeword.

An integrated circuit device comprising:

• at least one digital signal processing module operably couplable to a power amplifier comprising a plurality of power amplifier cells, wherein the at least one digital signal processing module comprises:
• at least one digital pre-distortion component arranged to:
• interpolate a portion of at least one digital pre-distortion codeword, and
• output the portion of the at least one digital pre-distortion codeword to a portion of at least one power amplifier cell of the power amplifier thereby generating an analogue RF signal for transmission over the RF interface based at least partly on the interpolated portion of the at least one digital pre-distortion codeword.

A method of generating a radio frequency signal for transmission over a radio frequency (RF) interface, the method comprising:

• generating at least one digital pre-distortion codeword;
• applying the at least one digital pre-distortion codeword to a plurality of power amplifier cells of a power amplifier:
• interpolating a portion of the at least one digital pre-distortion codeword, and
• outputting the portion of the at least one digital pre-distortion codeword to a portion of at least one power amplifier cell of the power amplifier thereby generating an analogue RF signal for transmission over the RF interface based at least partly on the interpolated portion of the at least one digital pre-distortion codeword.