Push-pull radio frequency power amplifier and method for controlling circuit

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 power output stage circuit comprises a third transformer;
• when the second transistor and the third transistor are the HBT, a primary coil of the third transformer is coupled with a secondary coil led out from a base of the second transistor to form a fourth transformer;
• the primary coil of the third transformer is coupled with a secondary coil led out from a base of the third transistor to form a fifth transformer;
• and the coupling feedback circuit comprises the secondary coil led out from the base of the second transistor and the secondary coil led out from the base of the third transistor;
• when the second transistor and the third transistor are the MOSFETs, the primary coil of the third transformer is coupled with a secondary coil led out from a gate of the second transistor to form a fourth transformer;
• the primary coil of the third transformer is coupled with a secondary coil led out by a gate of the third transistor to form a fifth transformer;
• and the coupling feedback circuit comprises the secondary coil led out from the gate of the second transistor and the secondary coil led out from the gate of the third transistor.

A method of controlling circuit, which is applied in a push-pull radio frequency power amplifier comprising a coupling feedback circuit, a drive stage circuit and a power output stage circuit, in which the coupling feedback circuit is connected with the driving stage circuit and/or the power output stage circuit;

• wherein the method comprises:
• generating 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, in which 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
• when the coupling feedback circuit is connected with the drive stage circuit, the coupling feedback circuit and the drive stage circuit are located at different metal layers respectively to achieve interlayer coupling between surfaces of the different metal layers;
• and
• when the coupling feedback circuit is connected with the power output stage circuit, the coupling feedback circuit and the power output stage circuit are located at different metal layers respectively to achieve the interlayer coupling between the surfaces of the different metal layers.