US 12,456,955 B2
Push-pull radio frequency power amplifier and method for controlling circuit
Huadong Wen, Guangzhou (CN); and Dajie Dai, Guangzhou (CN)
Assigned to SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou (CN)
Filed by SMARTER MICROELECTRONICS (GUANG ZHOU) CO., LTD., Guangzhou (CN)
Filed on Sep. 5, 2022, as Appl. No. 17/929,729.
Application 17/929,729 is a continuation of application No. PCT/CN2021/132161, filed on Nov. 22, 2021.
Claims priority of application No. 202110129749.6 (CN), filed on Jan. 29, 2021.
Prior Publication US 2022/0416739 A1, Dec. 29, 2022
Int. Cl. H03F 3/26 (2006.01); H03F 1/30 (2006.01); H03F 3/24 (2006.01)
CPC H03F 3/26 (2013.01) [H03F 1/308 (2013.01); H03F 3/245 (2013.01); H03F 2200/117 (2013.01); H03F 2200/451 (2013.01); H03F 2200/541 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A push-pull radio frequency power amplifier, comprising: a coupling feedback circuit, a drive stage circuit and a power output stage circuit, the coupling feedback circuit being connected with the drive stage circuit and/or the power output stage circuit;
wherein, the coupling feedback circuit is configured to generate an alternating voltage at an input end of a first transistor and/or an input end of a push-pull transistor; when the alternating voltage and a voltage at the input end are in a same direction, a positive feedback of an input signal at the input end is achieved; the first transistor represents a transistor in the drive stage circuit and the push-pull transistor represents a second transistor and a third transistor that form a push-pull structure in the power output stage circuit;
wherein the drive stage circuit comprises a first transformer;
when the first transistor is a heterojunction bipolar transistor HBT, a primary coil of the first transformer is coupled with a secondary coil led out from a base of the first transistor to form a second transformer; and the coupling feedback circuit comprises the secondary coil led out from the base of the first transistor;
when the first transistor is a metal-oxide semiconductor field effect transistor MOSFET, the primary coil of the first transformer is coupled with a secondary coil led out from a gate of the first transistor to form a second transformer; and the coupling feedback circuit includes the secondary coil led out from the gate of the first transistor.