US 12,294,339 B2
Power amplifier circuit
Kenichi Shimamoto, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Feb. 9, 2022, as Appl. No. 17/650,408.
Claims priority of application No. 2021-019617 (JP), filed on Feb. 10, 2021; and application No. 2021-091645 (JP), filed on May 31, 2021.
Prior Publication US 2022/0271720 A1, Aug. 25, 2022
Int. Cl. H03F 3/24 (2006.01); H03F 1/02 (2006.01); H03F 3/195 (2006.01)
CPC H03F 3/245 (2013.01) [H03F 1/0222 (2013.01); H03F 3/195 (2013.01); H03F 2200/451 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A power amplifier circuit comprising:
a first amplifier that has a first input port and that is configured to amplify a first signal input via the first input port;
a second amplifier that has a second input port connected in parallel with the first input port of the first amplifier and that is configured to amplify a second signal input via the second input port;
a first bias circuit configured to supply a first bias current or a first bias voltage to the first amplifier;
a second bias circuit configured to supply a second bias current or a second bias voltage to the second amplifier; and
a control circuit configured to control the first bias circuit and the second bias circuit, wherein:
when the power amplifier circuit operates in a first power mode, the control circuit is configured to control the first bias circuit and the second bias circuit such that the first bias current or the first bias voltage is supplied to the first amplifier, and the second bias current or the second bias voltage is not supplied to the second amplifier,
when the power amplifier circuit operates in a second power mode, the control circuit is configured to control the first bias circuit and the second bias circuit such that the first bias current or the first bias voltage is supplied to the first amplifier and the second bias current or the second bias voltage is supplied to the second amplifier,
an output power of the power amplifier circuit is higher in the second power mode than in the first power mode, and
the control circuit is further configured to continuously operate the first amplifier when the power mode is switched from the first power mode to the second power mode.