Power amplification system with programmable load line

A radio-frequency (RF) module comprising:

• a packaging substrate configured to receive a plurality of components;
• and
• a power amplification system implemented on the packaging substrate, the power amplification system including a plurality of power amplifiers connected in parallel between a radio-frequency (RF) input terminal and an RF output terminal, each one of the plurality of power amplifiers including a power amplifier input terminal coupled to the RF input terminal, a power amplifier output terminal coupled to the RF output terminal, and an enable terminal for receiving an enable signal, the plurality of power amplifiers powered by a supply voltage, the power amplification system further including an output impedance matching component disposed between the plurality of power amplifier output terminals and the signal output terminal, the power amplification system further including a power amplifier controller configured to selectively provide an enable signal to one or more of the plurality of power amplifiers based on an output impedance at the RF output terminal and, based on a value of the supply voltage, to adjust the output impedance matching component to provide a targeted resistance at the plurality of power amplifier output terminals to provide a targeted load line for the plurality of power amplifiers to improve efficiency of the plurality of power amplifiers.

A wireless device comprising:

• a transceiver configured to generate a radio-frequency (RF) signal;
• a front-end module (FEM) in communication with the transceiver, the FEM including a packaging substrate configured to receive a plurality of components, the FEM further including a power amplification system implemented on the packaging substrate, the power amplification system including a plurality of power amplifiers connected in parallel between a radio-frequency (RF) input terminal and an RF output terminal, each one of the plurality of power amplifiers including a power amplifier input terminal coupled to the RF input terminal, a power amplifier output terminal coupled to the RF output terminal, and an enable terminal for receiving an enable signal, the plurality of power amplifiers powered by a supply voltage, the power amplification system further including an output impedance matching component disposed between the plurality of power amplifier output terminals and the signal output terminal, the power amplification system further including a power amplifier controller configured to selectively provide an enable signal to one or more of the plurality of power amplifiers based on an output impedance at the RF output terminal and, based on a value of the supply voltage, to adjust the output impedance matching component to provide a targeted resistance at the plurality of power amplifier output terminals to provide a targeted load line for the plurality of power amplifiers to improve efficiency of the plurality of power amplifiers;
• and
• an antenna in communication with the FEM, the antenna configured to transmit the amplified RF signal received from the power amplification system.