Power amplifier arrangement and method for memory correction/linearization

A method of operating a power amplifier arrangement comprising a power amplifier and a power supply, the method comprising the steps of:

• modulating a power supply signal of the power supply as a function of an input signal supplied to the power amplifier arrangement, the power supply signal being supplied to the power amplifier;
• modifying the input signal supplied to the power amplifier arrangement as a function of the input signal supplied to the power amplifier arrangement and a prediction of distortion of the power supply signal supplied to the power amplifier to produce the modified version of the input signal.

A memory correction module for a power amplifier arrangement comprising:

• a Vdd predictor adapted for predicting waveform distortion of the power supply voltage, wherein the Vdd predictor generates an output that is a function of a target power supply voltage, the target power supply voltage modulated as a function of an input supplied to the power amplifier arrangement and unaffected by the waveform distortion;
• and
• a main-path corrector adapted for modifying the input supplied to the power amplifier arrangement as a function of the input to the power amplifier arrangement and the output of the Vdd predictor.