Patent ID: 8400216

Claim:
A 3-way Doherty power amplifier comprising: a first path unit and a second path unit which are divided from an input terminal; a driving carrier amplifier connected to the first path unit; a carrier amplifier connected to the driving carrier amplifier; a second λ/4 transmission line connected to the second path unit; a driving peaking amplifier connected to the second λ/4 transmission line; first and second peaking amplifiers connected in common to an output terminal of the driving peaking amplifier; a first λ/4 transmission line connected to the carrier amplifier; and an output terminal to which the first λ/4 transmission line, the first peaking amplifier, and the second peaking amplifier are connected in common, wherein it is set in a first operating region that only the driving carrier amplifier and the carrier amplifier operate, it is set in a second operating region that the driving peaking amplifier and the first peaking amplifier operate additionally, and it is set in a third operating region that the second peaking amplifier operates further additionally.