US 12,476,592 B2
Power amplifier
Kiichiro Takenaka, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Nov. 20, 2020, as Appl. No. 16/953,890.
Claims priority of application No. 2019-223209 (JP), filed on Dec. 10, 2019; and application No. 2020-133611 (JP), filed on Aug. 6, 2020.
Prior Publication US 2021/0175853 A1, Jun. 10, 2021
Int. Cl. H03F 1/02 (2006.01); H01P 5/16 (2006.01); H03F 3/21 (2006.01)
CPC H03F 1/0288 (2013.01) [H01P 5/16 (2013.01); H03F 3/211 (2013.01); H03F 2200/372 (2013.01); H03F 2200/451 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A power amplifier comprising: a splitter configured to split a first signal into a second signal and a third signal, the third signal being delayed from the second signal by 90°; a first amplifier configured to amplify the second signal and to output a fourth signal when a power level of the first signal is equal to or greater than a first level; a second amplifier configured to amplify the third signal and to output a fifth signal when the power level of the first signal is equal to or greater than a second level, the second level being greater than the first level; and a hybrid coupler comprising a first transmission line and a second transmission line, wherein the first transmission line is configured to receive the fourth signal at a first terminal of the first transmission line, wherein the second transmission line is configured to receive the fifth signal at a first terminal of the second transmission line, wherein the second transmission line is open at a second terminal of the second transmission line, wherein the first transmission line is configured to output, from a second terminal of the first transmission line, an amplified first signal, the amplified first signal being a combination of the fourth signal and the fifth signal, and
wherein the second transmission line is open at the second terminal of the second transmission line and the second transmission line is connected to a passive device whose impedance is greater than or equal to a hundredfold of a characteristic impedance of the second transmission line.