Patent ID: 8581665
Filing Date: 2013-11-12
Classification: H03F

Abstract:
1. A Doherty amplifier comprising: an input distributor; a coupler; a plurality of Doherty circuits connected between the input distributor and the coupler, each of the plurality of Doherty circuits having a carrier amplifier, a peaking amplifier, a distributor distributing a input signal to the carrier amplifier and the peaking amplifier, and a combiner that transforms an output impedance of the carrier amplifier and combines outputs of the carrier amplifier and the peaking amplifier, wherein the carrier amplifier and the peaking amplifier of each of the plurality of Doherty circuits are integrated in a single semiconductor chip, and an output impedance of each of the carrier amplifier and the peaking amplifier is 20-100 Ω, and wherein the combiner of each of the plurality of Doherty circuits includes a line having a characteristic impedance of 20-100 Ωand is connected to the peaking amplifier and the carrier amplifier without impedance conversion, wherein the semiconductor chip and the combiner of each of the plurality of Doherty circuits are mounted in a package.