Power amplification system, device and method

A method comprising:

• receiving an input signal and decomposing, using an out-phase generator, the signal into two vector signals, each having an out-phasing angle;
• amplifying each vector signal using first and second power amplifiers;
• modulating a supply voltage of each power amplifier based on an envelope of the input signal;
• generating an estimate of the bandwidth-limited envelope gain of the input signal and feeding back the estimate into the out-phasing generator;
• and
• combining the amplified vector signals;
• and
• generating an updated out-phasing angle based on the estimate of the bandwidth-limited envelope gain of the input signal.

An apparatus comprising:

• a linear amplification using non-linear components (Linc) processing system to receive an input signal and decompose the signal into two vector signals to be amplified by a pair of power amplifiers and combined;
• an envelope restoration (ER) processing system to estimate an envelope of the input signal and generate a bandwidth-limited envelope gain to modulate a supply voltage of each power amplifier;
• and
• a feedback path from the ER processing system to the Linc processing system to provide information about the bandwidth-limited envelope gain to the Linc processing system,
• wherein the feedback path comprises a bandwidth limit estimator to generate an estimate of the bandwidth-limited envelop gain.