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

An integrated circuit device comprising at least one digital signal processing module configurable to operate in at least a first mode wherein the at least one digital signal processing module is arranged to:

• receive a digital reference signal;
• select, from a reduced set of digital power amplifier (DPA) control values, a plurality of DPA control values based at least partly on the received digital reference signal;
• perform interpolation of the plurality of selected DPA control values to determine a DPA control value from a non-reduced set of DPA control values representative of the received digital reference signal;
• and
• output to at least one DPA component the determined DPA control value representative of the received digital reference signal.

A method of performing digital pre-distortion of a signal for transmission over a radio frequency (RF) interface, the method comprising, in a first mode of operation:

• receiving a digital input signal;
• selecting, from a reduced set of digital power amplifier (DPA) control values, a plurality of DPA control values based at least partly on the received digital input signal;
• performing interpolation of the plurality of selected DPA control values to determine a DPA control value from a non-reduced set of DPA control values representative of the received digital input signal;
• and
• outputting to at least one DPA component the determined DPA control value representative of the received digital input signal.