Efficiency improvement of doherty power amplifier using supply switching and digitally controlled gate bias modulation of peaking amplifier

摘要

An apparatus for amplifying a signal is provided. The apparatus includes a carrier transistor, a peaking transistor, a controller, and a power supply switching unit, wherein the controller controls the power supply switching unit to switch between two or more power supplies and wherein the power supply switching unit provides power from one of the two or more power supplies to the peaking transistor.