A radio frequency power amplifier

Abstract

The embodiment of the application discloses a radio frequency power amplifier, which comprises an amplification circuit, a balun and a resonance circuit. The amplification circuit is configured to receive a first radio frequency signal and amplify the first radio frequency signal into a second radio frequency signal. The balun is connected with an output end of the amplification circuit and is configured to receive the second radio frequency signal and output the second radio frequency signal as a single-ended output signal. The balun comprises a primary coil and a secondary coil. The resonance circuit is coupled with the balun and is configured to suppress a harmonic signal of the amplification circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of radio frequency circuit, in particular to a radio frequency power amplifier. BACKGROUND

[0002] The radio frequency power amplifier is a core module of modern wireless communication system, and its performance directly determines the signal transmission distance, quality and overall efficiency. However, due to its inherent nonlinear characteristics, the power amplifier will generate rich high-order harmonic components (such as second harmonic, third harmonic, etc.) when working. If these harmonic energies cannot be effectively suppressed, they will be radiated through the antenna, causing serious electromagnetic interference.

[0003] At present, the circuit for suppressing different order harmonics will increase the complexity, volume and manufacturing cost of the circuit, and may also interfere with the fundamental signal path. At the same time, the parasitic parameters of the devices in the circuit will cause additional loss of the fundamental signal in the transmission process, and adversely affect the wideband performance of the output matching network. SUMMARY

[0004] The present application provides a radio frequency power amplifier.

[0005] The technical scheme of the present application is implemented as follows:

[0006] The present application provides a radio frequency power amplifier, which comprises an amplification circuit, a balun and a resonance circuit; the amplification circuit is configured to receive a first radio frequency signal and amplify the first radio frequency signal into a second radio frequency signal; the balun is connected with an output end of the amplification circuit and is configured to receive the second radio frequency signal and output the second radio frequency signal as a single-ended output signal; the balun comprises a primary coil and a secondary coil; the resonance circuit is coupled with the balun and is configured to suppress harmonic signals of the amplification circuit.

[0007] In some embodiments of the present application, the primary coil comprises an intermediate tap; the intermediate tap divides the primary coil into a first sub-coil and a second sub-coil; and the resonance circuit is coupled with the primary coil.

[0008] In some embodiments of the present application, the resonance circuit comprises a first capacitor, a first inductor and a second inductor; the first capacitor, the first inductor and the second inductor form a loop; wherein a first end of the first capacitor is connected with a first end of the first inductor, a second end of the first capacitor is connected with a second end of the second inductor, and a second end of the first inductor is connected with a first end of the second inductor.

[0009] In some embodiments of the present disclosure, the same-named end of the first sub-coil and the same-named end of the first inductor are in the same direction; wherein the first sub-coil and the first inductor are coupled; the same-named end of the second sub-coil and the same-named end of the second inductor are in opposite directions; wherein the second sub-coil and the second inductor are coupled.

[0010] In some embodiments of the present disclosure, the radio frequency power amplifier further comprises: a second capacitor; the middle tap of the main-stage coil is connected to the ground end through the second capacitor.

[0011] In some embodiments of the present disclosure, the resonant circuit comprises: a first capacitor, a first inductor and a second inductor; the first capacitor, the first inductor and the second inductor form a loop; wherein the first end of the first capacitor is connected to the first end of the first inductor, the second end of the first capacitor is connected to the second end of the second inductor, and the second end of the first inductor is connected to the first end of the second inductor; the second end of the first inductor and the first end of the second inductor are connected to the ground end.

[0012] In some embodiments of the present disclosure, the same-named end of the first sub-coil and the same-named end of the first inductor are in the same direction; wherein the first sub-coil and the first inductor are coupled; the same-named end of the second sub-coil and the same-named end of the second inductor are in the same direction; wherein the second sub-coil and the second inductor are coupled.

[0013] In some embodiments of the present disclosure, the main-stage coil is a single continuous winding; the resonant circuit is coupled with the main-stage coil, or the resonant circuit is coupled with the secondary coil; the resonant circuit comprises: a first capacitor and a third inductor; the first capacitor and the third inductor form a loop.

[0014] In some embodiments of the present disclosure, the first radio frequency signal is a differential radio frequency signal, comprising two sub-signals; the amplification circuit comprises: a first power amplifier and a second power amplifier; the input end of the first power amplifier and the input end of the second power amplifier respectively receive the two sub-signals of the first radio frequency signal; the output end of the first power amplifier is connected to the first end of the main-stage coil; the output end of the second power amplifier is connected to the second end of the main-stage coil.

[0015] In some embodiments of the present disclosure, the first radio frequency signal is a single-ended radio frequency signal; the amplification circuit comprises: a third power amplifier; the input end of the third power amplifier receives the first radio frequency signal; the output end of the third power amplifier is connected to the first end of the main-stage coil.

[0016] It can be seen that, in the embodiment of the application, the radio frequency power amplifier amplifies the received first radio frequency signal into a second radio frequency signal through the amplification circuit, and outputs the second radio frequency signal to the input end of the balun. The resonant circuit coupled with the balun can suppress the harmonics of each order, and the output end of the balun outputs the second radio frequency signal as a single-ended output signal. By coupling the resonant circuit in the balun structure, the characteristics of the resonant circuit in the harmonic frequency band are utilized to effectively suppress the high-order harmonics, while the transmission performance of the fundamental frequency signal is not affected. At the same time, the use of additional filtering elements in the radio frequency power amplifier is reduced, the complexity and loss are reduced, and the wideband characteristics of the output matching network are maintained. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0018] Figure 1 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 1 ;

[0019] Figure 2 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 2 ;

[0020] Figure 3 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 3 ;

[0021] Figure 4 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 4 ;

[0022] Figure 5 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 5 ;

[0023] Figure 6 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 6 ;

[0024] Figure 7 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 7 ;

[0025] Figure 8 Structure diagram of the radio frequency power amplifier provided by the embodiment of the application Figure 8 . DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the specific technical solutions of the present application will be further described below with the drawings in the embodiments of the present application. The following embodiments are used to explain the embodiments of the present application, but are not used to limit the scope of the embodiments of the present application.

[0027] In the following description, “some embodiments” are described, which describe a subset of all possible embodiments, but it can be understood that “some embodiments” can be the same subset or different subsets of all possible embodiments, and can be combined with each other without conflict.

[0028] In the following description, the terms “first\second\third” are only to distinguish similar objects, and do not represent a specific order of the objects. It can be understood that “first\second\third” can be interchanged in a specific order or sequence as allowed, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0029] In this document, when a layer / element is referred to as being “on” another layer / element, it can be directly on the other layer / element, or there can be an intervening layer / element between them. In addition, in one orientation, a layer / element is on another layer / element, when the orientation is reversed, the layer / element can be below the other layer / element.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the embodiments of the present application belong. The terms used herein are only for the purpose of describing the embodiments of the present application, and are not intended to limit the embodiments of the present application.

[0031] The embodiments of the present disclosure provide a radio frequency power amplifier, referring to Figure 1 As shown in the figure, the radio frequency power amplifier includes an amplification circuit 10, a balun (including a primary coil L1 and a secondary coil L2) and a resonance circuit 20.

[0032] In the embodiments of the present disclosure, referring to Figure 1 As shown in the figure, the amplification circuit 10 is configured to receive a first radio frequency signal RFIN, and amplify the first radio frequency signal RFIN into a second radio frequency signal RFOUT.

[0033] It should be noted that, referring to Figure 1As shown, the amplification circuit 10 is the core part of the radio frequency power amplifier, and is configured to perform power amplification on the input first radio frequency signal RFIN to obtain a second radio frequency signal RFOUT with a higher amplitude. The amplification circuit 10 can be composed of one or two power amplifiers. For example, the amplification circuit 10 can be a single-ended power amplifier, or two symmetrical differential power amplifiers.

[0034] In the embodiments of the present disclosure, referring to Figure 1 and Figure 2 As shown, the balun is connected to the output end of the amplification circuit 10 and is configured to receive the second radio frequency signal RFOUT and output the second radio frequency signal RFOUT as a single-ended output signal. The balun includes a primary coil L1 and a secondary coil L2.

[0035] It should be noted that, referring to Figure 1 and Figure 2 The balun can convert a differential signal into a single-ended signal or transmit a single-ended signal to a single-ended signal. The balun receives the second radio frequency signal RFOUT output by the amplification circuit 10 and converts the signal into a single-ended output signal suitable for transmission. The balun realizes the function through a transformer structure, which includes a primary coil L1 and a secondary coil L2. The primary coil L1 is connected to the output end of the amplification circuit 10, and the secondary coil L2 is connected to the output end of the amplification circuit 10.

[0036] In the embodiments of the present disclosure, referring to Figure 1 and Figure 2 As shown, the resonant circuit 20 is coupled to the balun and is configured to suppress the harmonic signal of the amplification circuit 10.

[0037] It should be noted that, referring to Figure 1 and Figure 2 The traditional scheme is to introduce additional LC (inductor, capacitor) devices in the output link to suppress harmonics, but the parasitic parameters of the devices themselves will cause additional loss of the fundamental signal during transmission. This loss will directly reduce the output efficiency of the radio frequency power amplifier. In the present embodiment, the resonant circuit 20 is coupled to the primary coil L1 or the secondary coil L2 of the balun, so that each order of harmonic is effectively absorbed or consumed by the resonant circuit in the harmonic frequency band, while the fundamental signal is not affected, thereby realizing effective suppression of harmonics.

[0038] It can be understood that, referring to Figure 1 and Figure 2As shown in FIG. 1, the radio frequency power amplifier amplifies the received first radio frequency signal RFIN into a second radio frequency signal RFOUT through the amplification circuit 10, and outputs the second radio frequency signal RFOUT to the input end of the balun. The resonant circuit 20 coupled with the balun suppresses the harmonics, and the output end of the balun outputs the second radio frequency signal RFOUT as a single-ended output signal. By coupling the resonant circuit 20 in the balun structure, the resonant circuit 20 is used to generate resonance at the harmonic frequency band, thereby effectively suppressing high-order harmonics while not affecting the transmission performance of the fundamental frequency signal. At the same time, the use of additional filtering elements in the radio frequency power amplifier is reduced, the complexity and loss are reduced, and the wideband characteristics of the output matching network are maintained.

[0039] In some embodiments of the present disclosure, referring to Figure 2 and Figure 3 As shown in FIG. 1, the first radio frequency signal RFIN is a differential radio frequency signal, including two sub-signals (positive input signal RFIN+ and negative input signal RFIN-); the amplification circuit 10 is: a first power amplifier PA1 and a second power amplifier PA2; the input end of the first power amplifier PA1 and the input end of the second power amplifier PA2 respectively receive the two sub-signals (positive input signal RFIN+ and negative input signal RFIN-) of the first radio frequency signal RFIN; the output end of the first power amplifier PA1 is connected to the first end of the main-stage coil L1; and the output end of the second power amplifier PA2 is connected to the second end of the main-stage coil L1.

[0040] It should be noted that, referring to Figure 2 and Figure 3 As shown in FIG. 1, the differential radio frequency signal is a signal form composed of two sub-signals (positive input signal RFIN+ and negative input signal RFIN-) with equal amplitude but opposite phase. The first power amplifier PA1 and the second power amplifier PA2 respectively receive the two sub-signals (positive input signal RFIN+ and negative input signal RFIN-) of the differential radio frequency signal, and independently amplify and output to the two ends of the main-stage coil L1. The amplification circuit 10 uses the symmetric structure of the main-stage coil L1 to form a differential mode signal from the output signal, thereby improving system efficiency and stability.

[0041] In some embodiments of the present disclosure, referring to Figure 4 and Figure 5 As shown in FIG. 1, the first radio frequency signal RFIN is a single-ended radio frequency signal; the amplification circuit 10 is: a third power amplifier PA3; the input end of the third power amplifier PA3 receives the first radio frequency signal RFIN; and the output end of the third power amplifier PA3 is connected to the first end of the main-stage coil L1.

[0042] It should be noted that, referring to Figure 4 and Figure 5As shown, the single-ended radio frequency signal refers to a radio frequency signal transmitted on only one signal line, and the reference point of the single-ended radio frequency signal is the ground. Compared with the differential signal, the single-ended signal has a simple structure and is suitable for a case where there is a limitation on cost and board space. The input end of the third power amplifier PA3 receives the single-ended radio frequency signal, and the output end of the third power amplifier PA3 is connected to the first end of the primary coil L1, forming a complete signal transmission link. At this time, the second end of the primary coil L1 is connected to the ground end.

[0043] In some embodiments of the present disclosure, referring to Figure 2 and Figure 3 As shown, the primary coil L1 is a single continuous winding; the resonant circuit 20 is coupled with the primary coil L1, or the resonant circuit 20 is coupled with the secondary coil L2; the resonant circuit 20 includes: a first capacitor C1 and a third inductor L5; the first capacitor C1 and the third inductor L5 form a loop.

[0044] It should be noted that, referring to Figure 2 As shown, when the amplification circuit 10 is the first power amplifier PA1 and the second power amplifier PA2, and the resonant circuit 20 is coupled with the primary coil L1, the same-named end of the third inductor L5 is the same as the same-named end of the primary coil L1; wherein the third inductor L5 and the primary coil L1 are coupled. When the odd harmonic (third harmonic 3f0) is input to the primary coil L1, the primary coil L1 is power coupled into the resonant circuit 20, suppressing the transmission of the odd harmonic to the secondary coil L2, thereby improving the harmonic performance of the radio frequency power amplifier. Compared with the traditional LC notch filter or series resonant network, the introduction of additional devices is reduced, the system loss is reduced, and the wideband characteristics of the output matching network are maintained.

[0045] Referring to Figure 3 As shown, when the amplification circuit 10 is the first power amplifier PA1 and the second power amplifier PA2, and the resonant circuit 20 is coupled with the secondary coil L2, at the resonant frequency point, the secondary coil L2 is power coupled into the resonant network, so that neither the odd harmonic nor the even harmonic is transmitted into the common end, thereby improving the harmonic performance of the radio frequency power amplifier.

[0046] It should also be noted that, referring to Figure 4 and Figure 5 As shown, when the amplification circuit 10 is the third power amplifier PA3, that is, when the single-ended signal is input, regardless of whether the resonant circuit 20 is coupled with the primary coil L1 or the secondary coil L2, at the resonant frequency point, the primary coil L1 or the secondary coil L2 is power coupled into the resonant network, so that neither the odd harmonic nor the even harmonic is transmitted into the common end, thereby improving the harmonic performance of the radio frequency power amplifier.

[0047] In some embodiments of the present disclosure, referring to Figure 1 andFigure 6 As shown, the main-stage coil L1 includes: a middle tap CT; Figure 6 The middle tap CT in the main-stage coil L1 divides Figure 1 The main-stage coil L1 into Figure 6 The first sub-coil L11 and the second sub-coil L12 as shown; the resonant circuit 20 is coupled with the main-stage coil L1.

[0048] It should be noted that, referring to Figure 1 and Figure 6 As shown, by setting the middle tap CT in the main-stage coil L1, more fine control of the input signal can be achieved, providing more current path selection when suppressing odd and even harmonics. The middle tap CT divides the main-stage coil L1 into the first sub-coil L11 and the second sub-coil L12, which facilitates improving the harmonic suppression capability of the resonant circuit 20 while reducing the impact on the fundamental frequency performance.

[0049] It should also be noted that, referring to Figure 1 and Figure 6 As shown, the electromagnetic induction relationship between the resonant circuit 20 and the main-stage coil L1 can produce stronger energy transfer in the harmonic frequency band, thereby effectively guiding the harmonic signal into the resonant circuit 20 and absorbing or suppressing it.

[0050] In some embodiments of the present disclosure, referring to Figure 6 As shown, the resonant circuit 20 includes: a first capacitor C1, a first inductor L3, and a second inductor L4; the first capacitor C1, the first inductor L3, and the second inductor L4 form a loop; wherein a first end of the first capacitor C1 is connected to a first end of the first inductor L3, a second end of the first capacitor C1 is connected to a second end of the second inductor L4, and a second end of the first inductor L3 is connected to a first end of the second inductor L4.

[0051] In some embodiments of the present disclosure, referring to Figure 6 As shown, the like-named ends of the first sub-coil L11 and the first inductor L3 are in the same direction; wherein the first sub-coil L11 and the first inductor L3 are coupled; the like-named ends of the second sub-coil L12 and the second inductor L4 are in opposite directions; wherein the second sub-coil L12 and the second inductor L4 are coupled.

[0052] It should be noted that, referring to Figure 6 As shown, when the amplification circuit 10 is the first power amplifier PA1 and the second power amplifier PA2, the like-named ends of the first sub-coil L11 and the first inductor L3 are in the same direction, and the like-named ends of the second sub-coil L12 and the second inductor L4 are in opposite directions.

[0053] It should be noted that, referring to Figure 6As shown, when the even harmonic (second harmonic 2f0) is input to the main stage coil L1, the current flowing through the first sub-coil L11 and the current flowing through the second sub-coil L12 are opposite. In the loop formed by the first capacitor C1, the first inductor L3 and the second inductor L4, the first sub-coil L11 and the first inductor L3 are coupled, and the second sub-coil L12 and the second inductor L4 are coupled, and strong energy exchange can be generated at the resonance frequency point. Due to the coupling between the second sub-coil L12 and the second inductor L4, the like-named ends of the second sub-coil L12 and the second inductor L4 are opposite; thus, the current flowing through the first end of the first inductor L3 and the current flowing through the first end of the second inductor L4 are the same. At this time, the loop formed will effectively absorb or suppress the even harmonic. By adjusting the coupling direction of the like-named ends of the sub-coils (the first sub-coil L11 and the second sub-coil L12) and the inductors (the first inductor L3 and the second inductor L4), and further controlling the flow direction of the current in the resonance circuit 20, the current passing through the first inductor L3 and the second inductor L4 coupled into the resonance circuit 20 will not cancel each other out, so as to effectively absorb or suppress the even harmonic.

[0054] In some embodiments of the present disclosure, referring to Figure 7 and Figure 8 As shown, the radio frequency power amplifier further comprises a second capacitor C2; and the middle tap CT of the main stage coil L1 is connected to the ground end through the second capacitor C2.

[0055] It should be noted that, referring to Figure 7 and Figure 8 As shown, the middle tap CT is connected to the ground end, so that the middle tap CT is a signal potential reference point and the tap potential is 0V.

[0056] In some embodiments of the present disclosure, referring to Figure 7 and Figure 8 As shown, the resonance circuit 20 comprises a first capacitor C1, a first inductor L3 and a second inductor L4; the first capacitor C1, the first inductor L3 and the second inductor L4 form a loop; wherein the first end of the first capacitor C1 is connected to the first end of the first inductor L3, the second end of the first capacitor C1 is connected to the second end of the second inductor L4, and the second end of the first inductor L3 and the first end of the second inductor L4 are connected to the ground end.

[0057] In some embodiments of the present disclosure, referring to Figure 7 and Figure 8 As shown, the like-named ends of the first sub-coil L11 and the first inductor L3 are in the same direction; wherein the first sub-coil L11 and the first inductor L3 are coupled; and the like-named ends of the second sub-coil L12 and the second inductor L4 are in the same direction; wherein the second sub-coil L12 and the second inductor L4 are coupled.

[0058] It should be noted that, as shown in Figure 7 and Figure 8 , when the amplification circuit 10 is the first power amplifier PA1 and the second power amplifier PA2, the same name end of the first sub-coil L11 and the same name end of the first inductor L3 are in the same direction, and the same name end of the second sub-coil L12 and the same name end of the second inductor L4 are in the same direction.

[0059] It should be noted that, as shown in Figure 7 , when the even harmonic (second harmonic 2f0) is input to the main stage coil L1, because the intermediate tap CT is connected to the ground end, the even harmonic can also form a current loop to resonate, instead of current cancellation equivalent open circuit. In the loop formed by the first capacitor C1, the first inductor L3 and the second inductor L4, the second end of the first inductor L3 and the first end of the second inductor L4 are connected to the ground end. At this time, the current flowing through the first end of the first inductor L3 is in the opposite direction of the current flowing through the first end of the second inductor L4, and the current flowing through the first inductor L3 and the current flowing through the second inductor L4 flow to the ground end together. At this time, the loop formed can effectively suppress the even harmonic.

[0060] It should also be noted that, as shown in Figure 8 , when the odd harmonic (third harmonic 3f0) is input to the main stage coil L1, the current flowing through the first sub-coil L11 and the current flowing through the second sub-coil L12 are in the same direction, so that the current flowing through the first end of the first inductor L3 and the current flowing through the first end of the second inductor L4 in the resonance circuit 20 are in the same direction, which can effectively suppress the odd harmonic.

[0061] It can be understood that, as shown in Figure 7 and Figure 8 , by grounding at the intermediate tap CT of the main stage coil L1, the intermediate tap CT becomes a signal potential reference point, and the tap potential is 0V, changing the potential difference of the even harmonic. When the even harmonic is coupled to the resonance loop, the current flowing through the first end and the second end of the main stage coil L1 all flow to the intermediate tap CT. At the same time, the second end of the first inductor L3 and the first end of the second inductor L4 of the resonance circuit 20 are connected to the ground end, and the current passing through the first inductor L3 and the second inductor L4 will flow to the ground end together, providing a low impedance harmonic bleed path, which can effectively suppress the even harmonic.

[0062] It should be understood that the magnitude of the serial number of each process described above in various embodiments of the present application does not mean the order of execution, the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. The serial number of the above embodiments of the present application is only for description, not representing the advantages and disadvantages of the embodiments. It should be noted that in this paper, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0063] The serial number of the above embodiments of the present application is only for description, not representing the advantages and disadvantages of the embodiments. The methods disclosed in several method embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method embodiments. The features disclosed in several product embodiments provided by the present application can be combined arbitrarily without conflict to obtain new product embodiments. The features disclosed in several method or device embodiments provided by the present application can be combined arbitrarily without conflict to obtain new method or device embodiments.

[0064] The above is only a specific implementation of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the embodiments of the present application, which should be covered within the protection scope of the embodiments of the present application.

Claims

1. A radio frequency power amplifier, characterized by, The radio frequency power amplifier comprises: an amplification circuit configured to receive a first radio frequency signal, amplify the first radio frequency signal into a second radio frequency signal; a balun connected to an output end of the amplification circuit, configured to receive the second radio frequency signal and output the second radio frequency signal as a single-ended output signal; the balun comprises a primary coil and a secondary coil; a resonance circuit coupled to the balun, configured to suppress harmonic signals of the amplification circuit; the primary coil comprises an intermediate tap; the intermediate tap divides the primary coil into a first sub-coil and a second sub-coil; the resonance circuit is coupled to the primary coil; the resonance circuit comprises a first capacitor, a first inductor and a second inductor; the first capacitor, the first inductor and the second inductor form a loop; wherein a first end of the first capacitor is connected to a first end of the first inductor, a second end of the first capacitor is connected to a second end of the second inductor, and a second end of the first inductor is connected to a first end of the second inductor.

2. The radio frequency power amplifier of claim 1, wherein opposite ends of the first sub-coil and the first inductor are coupled in the same direction; and opposite ends of the second sub-coil and the second inductor are coupled in opposite directions.

3. The radio frequency power amplifier of claim 1, wherein the radio frequency power amplifier further comprises a second capacitor; the intermediate tap of the primary coil is connected to a ground end through the second capacitor.

4. The radio frequency power amplifier of claim 3, wherein the second end of the first inductor and the first end of the second inductor are connected to the ground end.

5. The radio frequency power amplifier of claim 4, wherein opposite ends of the first sub-coil and the first inductor are coupled in the same direction; and opposite ends of the second sub-coil and the second inductor are coupled in the same direction.

6. The radio frequency power amplifier of claim 1, wherein the primary coil is a single continuous winding; the resonance circuit is coupled to the primary coil, or the resonance circuit is coupled to the secondary coil; the resonance circuit comprises a first capacitor and a third inductor; the first capacitor and the third inductor form a loop.

7. The radio frequency power amplifier of claim 1, wherein the first radio frequency signal is a differential radio frequency signal comprising two sub-signals; the amplification circuit comprises a first power amplifier and a second power amplifier; input ends of the first power amplifier and the second power amplifier respectively receive the two sub-signals of the first radio frequency signal; an output end of the first power amplifier is connected to a first end of the primary coil; an output end of the second power amplifier is connected to a second end of the primary coil.

8. The radio frequency power amplifier of claim 1, wherein The first radio frequency signal is a single-ended radio frequency signal; the amplification circuit comprises a third power amplifier; An input end of the third power amplifier receives the first radio frequency signal; An output end of the third power amplifier is connected to a first end of the main-stage coil.

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