Integrated circuit, communication unit and method for improved amplitude resolution of an RF-DAC

摘要

An integrated circuit includes a digitally-controlled power generation stage (3324) for converting an input signal to a radio frequency carrier, the digitally-controlled power generation stage (3324) comprising a plurality of selectable switching devices capable of adjusting an envelope of the radio frequency carrier; and a pulse width modulator generator (1302, 1508) arranged to generate a pulse width modulator control signal and operably coupleable to the plurality of selectable switching devices of the digitally-controlled power generation stage (3324). The pulse width modulator generator (1302, 1508) inputs the pulse width modulator control signal to a subset of the plurality of the selectable switching devices such that a pulse width modulator signal adjusts the envelope radio frequency carrier output from the digitally-controlled power generation stage (3324).