Patent ID: 7091772
Filing Date: 2006-08-15
Classification: H03F

Abstract:
1. A method of performing power amplification under variable envelope excitation, comprising the steps of: converting an original input signal at least into a phase modulated signal part; feeding at least the phase modulated signal part to an input port of an amplifier unit; and amplifying said at least the phase modulated part of said original input signal by dynamically selecting a plurality of fixed power supply units for the amplifier unit, each fixed power supply unit having a different fixed output power, wherein the amplitude of the original input signal is recreated by the dynamic selection of the power supply units so as to change a further controllable input signal to the amplifier unit, in particular at least one of input power level, biasing voltage and biasing current, of the further controllable input signal supplied to a control input of the amplifier unit, during said step of amplifying.