Abstract: Devices and methods related to adjusting power provided to power amplifiers. In some embodiments, a power amplifier (PA) module may include a PA circuit configured to receive a radio-frequency (RF) signal, the PA circuit coupled to a power source. The PA module may also include a voltage module configured to generate a first voltage based on the RF signal. The PA module may further include a comparison module coupled to the voltage module and to the power source, the comparison module configured to adjust an output voltage of the power source based on the first voltage and a second voltage.