Power amplification system with programmable load line

Abstract

Disclosed herein are power amplification (PA) systems configured to amplify a signal, such as a radio-frequency signal. The PA system includes a plurality of power amplifiers that are configured to amplify a signal received at a signal input and to output the amplified signal at a signal output. The power amplifiers are configured to receive a supply voltage that is a combination of a battery voltage and an envelope tracking signal. The PA system includes a PA controller configured to control the power amplifiers based at least in part on the battery voltage or a power output of the power amplifiers. The PA controller can be configured to alter impedance matching components of the PA system to reconfigure a load line of the power amplifiers.

What is claimed is: 
     
         1 . A power amplification system comprising:
 a plurality of power amplifiers connected in parallel between a signal input terminal and a signal output terminal, each of the plurality of power amplifiers including a power amplifier input terminal coupled to the signal input terminal and a power amplifier output terminal coupled to the signal output terminal, the plurality of power amplifiers powered by a supply voltage;   an output impedance matching component disposed between the plurality of power amplifier output terminals and the signal output terminal; and   a power amplifier controller configured to adjust the output impedance matching component based on the supply voltage to provide a targeted load line for the plurality of power amplifiers to improve efficiency of the plurality of power amplifiers.