Patent ID: 8022759

Claim:
A method for power amplifying an input drive signal to a power amplification system comprising at least three different power amplification modes, where each power amplification mode is dedicated to operate within a pre-determined amplification interval, the method comprising: determining a momentary envelope value (E) of the input drive signal (S in ); and switching amplification mode to one of the at least three different amplification modes depending on the determined momentary envelope value (E), where the switching comprises: operating the power amplification system in a first amplification mode if the momentary envelope value (E) is determined to be within a first amplification interval, and when the power amplification system is operated in the first amplification mode, an outphasing technique is used for power amplifying the input drive signal; operating the power amplification system in a second amplification mode if the momentary envelope value (E) is determined to be within a second amplification interval; and operating the power amplification system in a third amplification mode if the momentary envelope value (E) is determined to be within a third amplification interval.