Series-Type Doherty Amplifier Without Hybrid Coupler

Amplifiers – With amplifier bypass means

Reexamination Certificate

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Details

C330S310000

Reexamination Certificate

active

10905661

ABSTRACT:
Provided is a series type Doherty amplifier which includes a first power amplifier and a second power amplifier using a plurality of transformers. The first power amplifier and the second power amplifier are connected in series. The second power amplifier and a first transformer are connected in series. A first path is branched from a junction between the first power amplifier and the second power amplifier and a phase delay device and a second transformer are connected in series. An output port of the second transformer is connected to a junction of a second path of an output port of the second power amplifier. An efficiency of each power amplifier is determined by a ratio of 1:M in size of a final stage of each of the first and second power amplifiers.

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patent: 6469581 (2002-10-01), Kobayashi
patent: 6472934 (2002-10-01), Pehlke
patent: 6791417 (2004-09-01), Pengelly et al.
patent: 6853245 (2005-02-01), Kim et al.
patent: 6922102 (2005-07-01), Myer et al.
patent: 7042283 (2006-05-01), Suzuki et al.
patent: 7053706 (2006-05-01), Kwon et al.
patent: 7061314 (2006-06-01), Kwon et al.
patent: 7064606 (2006-06-01), Louis

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