US 12,470,181 B2
Power amplifier circuit
Naofumi Takezono, Kyoto (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Kyoto (JP)
Filed by Murata Manufacturing Co., Ltd., Kyoto (JP)
Filed on Jul. 13, 2022, as Appl. No. 17/812,215.
Claims priority of application No. 2021-117598 (JP), filed on Jul. 16, 2021.
Prior Publication US 2023/0013008 A1, Jan. 19, 2023
Int. Cl. H03F 3/21 (2006.01); H03F 1/56 (2006.01)
CPC H03F 3/21 (2013.01) [H03F 1/565 (2013.01); H03F 2200/387 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A power amplifier circuit comprising:
an amplifier configured to amplify an input signal; and
a first resonant circuit that is connected to an output terminal of the amplifier and that is configured to attenuate a harmonic wave of an amplified signal obtained by amplifying the input signal,
the first resonant circuit comprising:
a first inductance circuit element connected between the amplifier and a ground,
a first capacitive circuit element connected between the amplifier and ground, and connected in series with the first inductance circuit element,
a second inductance circuit element connected in parallel with the first inductance circuit element,
a first switch connected in series with the second inductance circuit element, and
a second switch connected in parallel with the first switch, wherein sizes of surface areas of the first switch and the second switch are within 15% of each other.