Power control system for a wireless communication unit

A wireless communication unit comprising:

• a transmitter, the transmitter further comprising;
• a power amplifier having a power amplifier output and an output power level input;
• an inner analogue feedback power control loop including a log detector coupled to the power amplifier output, wherein the inner analogue feedback power control loop is arranged to feedback a signal to the output power level input to set an output power level of the power amplifier output;
• and
• an outer digital loop operably coupled to the power amplifier output;
• and
• a log predistortion function that is arranged to counteract a non-linear distortion effect of the log detector.

A wireless communication unit comprises:

• a transmitter, the transmitter further comprising;
• a power amplifier having a power amplifier output;
• and
• a digital outer control loop having a detector coupled to the power amplifier output, a controller, and a digital to analogue converter operably coupled to the digital outer control loop,
• wherein the digital outer control loop comprises a number of step attenuators within the digital outer loop, the step attenuators being operable to attenuate a feedback signal of the digital outer control loop provided to the power amplifier, where the power amplifier output is detected by the detector and the power amplifier is activated by the feedback signal, where the controller stepping out the step attenuators operates to increase the feedback signal, thereby increasing a power output from the power amplifier in a step like manner until such time as a detected power level exceeds a desired threshold value;
• and
• a reference ramp generator operably coupled to a linear translator.