Patent ID: 8773205
Filing Date: 2014-07-08
Classification: H03F

Abstract:
1. A Doherty power amplifier comprising a peak amplifying circuit and a carrier amplifying circuit, the peak amplifying circuit comprising a radio frequency switching circuit configured to control turn-on of the peak amplifying circuit; wherein a last stage carrier amplifier of the carrier amplifying circuit uses a high voltage heterojunction bipolar transistor (HVHBT) device, and a last stage peak amplifier of the peak amplifying circuit of the power amplifier uses a gallium nitride (GaN) device; the peak amplifying circuit comprises one or more peak amplifying branches, the radio frequency switching circuit being configured in each peak amplifying branch; when the peak amplifying branch is composed of a multistage peak amplifier, the radio frequency switching circuit positioned between a driver stage peak amplifier and the last stage peak amplifier is configured to control turn-on of the last stage peak amplifier in the peak power amplifier branch.