DOHERTY POWER AMPLIFIER BEING INSERT TYPE

摘要

PURPOSE: An embedded type bias mixed power amplifier is provided to obtain maximum output power by adding an embedded peaking amplifier to a conventional Doherty amplifier structure. CONSTITUTION: An embedded peaking amplifier(201) amplifies a basic signal of an input signal while being connected to a conventional Doherty amplifier(100) in parallel. A 90° hybrid distributor(202) respectively distributes power of the input signal in a 90° phase difference to the embedded peaking amplifier and the conventional Doherty amplifier. A first offset line(203) induces an output load of the conventional Doherty amplifier to a short. A second offset line(204) induces the output load of the embedded peaking amplifier to the short. A first transformer(205) performs load modulation between the first offset line and the second offset line. A second transformer(206) changes the load. [Reference numerals] (101) Main amplifier; (102) Peaking Amplifier; (104) Third transformer; (105) Fourth transformer; (106) Third offset line; (107) Fourth offset line; (201) Embedded Peaking Amplifier; (203) First offset line; (204) Second offset line; (205) First transformer; (206) Second transformer