WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD OF POWER CONTROL OF A POWER AMPLIFIER THEREFOR

摘要

A wireless communication unit (100) comprises a transmitter having a forward path comprising a power amplifier, PA, (124) and a feedback path arranged to feed back a portion of a signal output from the PA (124) to a point in the forward path prior to the PA (124). The forward path and feedback path form a constant gain tracking (CGT) loop. The feedback path comprises an adaptive predistortion logic module located outside of the CGT loop and arranged to form an APD loop with the forward path and feedback path. The CGT loop comprises a controller logic module arranged to determine a gain offset of a signal routed through the forward path and feedback path and in response thereto set a drive level of the PA (124).