Power amplification circuit and electronic device
By using a bridge coupler to replace the last-stage cyclist in a broadband power amplifier, the problems of large size, high insertion loss and high cost of the last-stage cyclist are solved, and a more efficient and cost-effective power amplifier circuit is realized, which improves the output power and efficiency of the last-stage.
Patent Information
- Application Number
- CN202311290561.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-28
- Publication Date
- 2025-03-28
AI Technical Summary
The last-stage cyclists in the broadband power amplifier architecture have problems such as large size, high insertion loss and high cost, which affect the final-stage efficiency and output power, making it difficult for product indicators to meet the design requirements.
A bridge coupler is used instead of the last-stage ring, and the output end of the power amplifier is connected through the input end of the bridge coupler, and the amplified RF signal is evenly divided into two output RF signals, and one output RF signal is output through the two output ends to match the load-assisted isolation reflected signal.
Good reverse isolation characteristics are achieved, instead of the one- and two-way power splitter, the defects of the last stage cyclometer are avoided, the size and cost of the power amplifier circuit are significantly reduced, and the output power and final stage efficiency are improved.
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Figure CN119727628A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of power electronics technology, and in particular to power amplifier circuits and electronic equipment. Background Art
[0002] In wireless systems, final-stage circulators are widely used to achieve functions such as transmit-receive separation, improve transmit-receive isolation, protect the transmitting source, and protect the power amplifier.
[0003] At present, the final-stage circulator in the broadband power amplifier architecture has problems such as large size, high insertion loss, and high cost, which will greatly affect the final-stage efficiency and output power, making it difficult for product indicators to meet design requirements. Summary of the invention
[0004] The main purpose of the embodiments of the present application is to provide a power amplifier circuit and an electronic device, aiming to solve the problems of large size, high insertion loss and high cost in the broadband power amplifier architecture containing a final-stage circulator in the related art.
[0005] To achieve the above object, an embodiment of the present application provides a power amplifier circuit, the power amplifier circuit comprising:
[0006] A power amplifier, wherein an input end of the power amplifier receives an input radio frequency signal, and the power amplifier is used to amplify the power of the input radio frequency signal and output an amplified radio frequency signal;
[0007] A bridge coupler, wherein the input end of the bridge coupler is connected to the output end of the power amplifier, and the bridge coupler is used to evenly divide the amplified radio frequency signal input by the power amplifier into two output radio frequency signals, and output one output radio frequency signal through two output ends respectively;
[0008] A matching load, one end of which is connected to the isolation end of the bridge coupler, and the other end of which is grounded, and the matching load is used to assist the bridge coupler in isolating part of the radio frequency signal that may be reflected.
[0009] In addition, to achieve the above-mentioned purpose, an embodiment of the present application further provides an electronic device, which includes the power amplifier circuit as described above.
[0010] The embodiment of the present application proposes a power amplifier circuit and an electronic device, which overcomes the problems of large size, high insertion loss and high cost of the final stage circulator used in the broadband power amplifier architecture in the related art. The power amplifier circuit includes: a power amplifier, the input end of the power amplifier receives the input RF signal, the power amplifier is used to power amplify the input RF signal and output the amplified RF signal; a bridge coupler, the input end of the bridge coupler is connected to the output end of the power amplifier, the two output ends of the bridge coupler respectively output one output RF signal, and the bridge coupler is used to evenly divide the amplified RF signal into two output RF signals; a matching load, one end of the matching load is connected to the isolation end of the bridge coupler, and the other end of the matching load is grounded, and the matching load is used to assist the bridge coupler in isolating part of the RF signal that may be reflected. The embodiment of the present application uses a bridge coupler to replace the final stage circulator, which ensures good reverse isolation characteristics, and at the same time plays the role of replacing the one-to-two power divider, avoiding the various defects of the final stage circulator, significantly reducing the size and cost of the power amplifier circuit, and improving the final stage output power and final stage efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.
[0012] Figure 1 A schematic diagram of the structure of a power amplifier using a circulator in an FDD architecture in the related art;
[0013] Figure 2 A schematic diagram of the structure of a power amplifier using a circulator in a TDD architecture in the related art;
[0014] Figure 3 A schematic diagram of the structure of a power amplifier circuit provided in an embodiment of the present application;
[0015] Figure 4 A schematic diagram of the structure of another power amplifier circuit provided in an embodiment of the present application;
[0016] Figure 5 A schematic diagram of a detailed structure of a first filtering structure and a second filtering structure involved in another power amplifier circuit provided in an embodiment of the present application;
[0017] Figure 6 A schematic diagram of another detailed structure of the first filter structure and the second filter structure involved in another power amplifier circuit provided in an embodiment of the present application;
[0018] Figure 7 for Figure 6 A structural schematic diagram of the first filter 401 and the first phase shifter 402 being swapped in position;
[0019] Figure 8 A schematic diagram of another detailed structure of a first filtering structure and a second filtering structure involved in another power amplifier circuit provided in an embodiment of the present application;
[0020] Fig. 9 for Figure 8 A schematic diagram of a structure in which the second filter 501 and the second phase shifter 502 are swapped in position;
[0021] Fig.10 A schematic diagram of the structure of another power amplifier circuit provided in an embodiment of the present application;
[0022] Fig.11 for Fig.10 A schematic diagram of a structure in which the filter and the adjustable phase shifter are simultaneously exchanged in position;
[0023] Fig.12 A schematic diagram of the structure of another power amplifier circuit provided in an embodiment of the present application;
[0024] Fig.13 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application.
[0025] The realization of the purpose, functional features and advantages of the embodiments of the present application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.
[0026] Description of Figure Numbers:
[0027] DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the embodiments of the present application.
[0029] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0030] In addition, in the embodiments of the present application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. In addition, the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, including scheme A, or scheme B, or a scheme that satisfies both A and B.
[0031] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.
[0032] It should also be understood that the references to "one embodiment" or "some embodiments" described in the specification of the embodiments of the present application mean that one or more embodiments of the embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Thus, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.
[0033] In wireless systems, final stage circulators are widely used to achieve functions such as transmission and reception separation, improving transmission and reception isolation, protecting the transmission source, and protecting the power amplifier. The block diagram of a power amplifier with a final stage circulator in a traditional FDD (Frequency Division Duplexing) architecture is shown in the figure. Figure 1 As shown in the figure, the block diagram of the power amplifier with the final circulator in the traditional TDD (Time Division Duplexing) architecture is as follows Figure 2As shown in the figure, Pin is the input signal, PA (Power Amplifier) is the power amplifier, Circulator is the circulator, Load is the load, Filter is the filter, LNA (Low Noise Amplifier) is the low noise amplifier, Power Divider is the power divider ( Figure 1 and Figure 2 In the figure, there are two power dividers (one-to-two power dividers), and Pout1 and Pout2 are two output signals. However, the current broadband circulators have problems such as large size, high insertion loss, and high cost, which makes it difficult for product indicators to meet design requirements and has a great impact on the final stage efficiency and output power.
[0034] Based on this, the embodiments of the present application provide a power amplifier circuit and an electronic device. By adopting a bridge coupler to replace the final-stage circulator, good reverse isolation characteristics are ensured, and at the same time, it replaces the one-to-two power divider, avoiding the various defects of the final-stage circulator, significantly reducing the size and cost of the power amplifier circuit, and improving the final-stage output power and final-stage efficiency.
[0035] The power amplifier circuit and electronic device provided in the embodiments of the present application are specifically described through the following embodiments. First, the power amplifier circuit in the embodiments of the present application is described.
[0036] The present application embodiment provides a power amplifier circuit, referring to Figure 3 , Figure 3 A schematic diagram of a power amplifier circuit provided in an embodiment of the present application is provided, wherein the power amplifier circuit comprises:
[0037] Power amplifier 10;
[0038] A bridge coupler 20, wherein the input end of the bridge coupler 20 is connected to the output end of the power amplifier 10, and the bridge coupler 20 is used to evenly divide the amplified RF signal input by the power amplifier 10 into two output RF signals, and output one output RF signal through two output ends respectively;
[0039] The matching load 30 has one end connected to the isolation end of the bridge coupler 20 and the other end grounded.
[0040] It should be noted that, in the present embodiment, the input end of the power amplifier 10 is connected to the input RF signal, and the power amplifier 10 is used to amplify the power of the input RF signal and output the amplified RF signal; in the present embodiment, the bridge coupler 20 is used to replace the final-stage circulator to ensure good reverse isolation characteristics, and at the same time replaces the one-to-two power divider. After the amplified RF signal input by the power amplifier 10 is fed into the input end of the bridge coupler 20, it is evenly divided into two output RF signals, and one output RF signal is output through the two output ends of the bridge coupler 20 respectively; the matching load 30 can be a resistor used to assist the bridge coupler 20 in isolating the reflected signal. If the standing waves at the two output ends are not good, a part of the signal is reflected. From the phase relationship of the signal, it can be seen that the reflected signal will not be output at the original output end, but will be consumed by the resistor at the isolation end, thereby achieving the effect of reverse isolation of the device connection end face.
[0041] As an example, the power amplifier 10 in this embodiment may be a power amplifier with a single-input or dual-input architecture, or a power amplifier with a Doherty or LMBA architecture, etc. This embodiment does not specifically limit its implementation method.
[0042] As an example, the power amplifier circuit provided in this embodiment may be applied to a high-power broadband RRU (Remote Radio Unit) base station.
[0043] Reference Figure 4 In some feasible embodiments, the two output ends of the bridge coupler 20 include a through port and a coupled port; the power amplifier circuit further includes:
[0044] A first filtering structure 40, wherein an input end of the first filtering structure 40 is connected to the through port, and the first filtering structure 40 is used to filter an output RF signal outputted from the through port and output a first RF signal;
[0045] The second filtering structure 50 has an input end connected to the coupling port, and the second filtering structure 50 is used to filter another output RF signal output from the coupling port and output a second RF signal.
[0046] Reference Figure 5 , in some feasible embodiments, the first filtering structure 40 includes a first filter 401, and the input end of the first filter 401 is connected to the through port;
[0047] The second filtering structure 50 comprises a second filter 501 , and an input end of the second filter 501 is connected to the coupling port.
[0048] It should be noted that, in the present embodiment, the first filtering structure 40 and the second filtering structure 50 both include filters for filtering the output RF signals, and may also include phase shifters for adjusting the signal directions between the antenna elements to be consistent; wherein, the filter is a necessary component, and the phase shifter is not a necessary component. As an example, the phase shifter can be removed and the signal reflection problem caused by the deterioration of standing waves at the antenna port can be solved by other means such as changing the antenna installation direction.
[0049] It should be noted that although the number of filters in this embodiment is doubled compared to the traditional solution using a circulator in the related art, in low-power devices, the size and cost of the filter are much smaller than the size and cost of the circulator. Therefore, the power amplifier circuit without a circulator proposed in this embodiment is more cost-effective than the circuit architecture with a circulator in the related art.
[0050] Reference Figure 6 In some feasible embodiments, the first filtering structure 40 includes a first filter 401 and a first phase shifter 402, the phase of the first phase shifter 402 is -270°, wherein the input end of the first filter 401 is connected to the through port, the output end of the first filter 401 is connected to the input end of the first phase shifter 402, or the input end of the first phase shifter 402 is connected to the through port, and the output end of the first phase shifter 402 is connected to the input end of the first filter 401;
[0051] The second filtering structure 50 comprises a second filter 501 , and an input end of the second filter 501 is connected to the coupling port.
[0052] As an example, in this embodiment, the first filtering structure 40 includes a phase shifter and the second filtering structure 50 does not include a phase shifter. In order to ensure that the signal directions between the antenna elements are consistent, the phase of the first phase shifter 402 needs to be -270°. The first filter 401 and the first phase shifter 402 are connected in series on the through port, and the installation positions of the two devices can be interchanged, such as Figure 6 and Figure 7 shown.
[0053] Reference Figure 8 , in some feasible embodiments, the first filtering structure 40 includes a first filter 401, and the input end of the first filter 401 is connected to the through port;
[0054] The second filtering structure 50 includes a second filter 501 and a second phase shifter 502, the phase of the second phase shifter 502 is -90°, wherein the input end of the second filter 501 is connected to the coupling port, and the output end of the second filter 501 is connected to the input end of the second phase shifter 502, or, the input end of the second phase shifter 502 is connected to the coupling port, and the output end of the second phase shifter 502 is connected to the input end of the second filter 501.
[0055] As an example, in this embodiment, the first filtering structure 40 does not include a phase shifter and the second filtering structure 50 includes a phase shifter. In order to ensure that the signal directions between the antenna elements are consistent, the phase of the second phase shifter 502 needs to be -90°. The second filter 501 and the second phase shifter 502 are connected in series on the coupling port, and the installation positions of the two devices can be interchanged, such as Figure 8 and Fig. 9 shown.
[0056] Reference Fig.10 In some feasible embodiments, the first filtering structure 40 includes a first filter 401 and a first adjustable phase shifter 412. When the transmitting function is realized, the phase of the first adjustable phase shifter 412 is 0°, and when the receiving function is realized, the phase of the first adjustable phase shifter 412 is -90°;
[0057] The second filtering structure 50 includes a second filter 501 and a second adjustable phase shifter 512. When the transmitting function is realized, the phase of the second adjustable phase shifter 512 is -90°, and when the receiving function is realized, the phase of the second adjustable phase shifter 512 is 0°.
[0058] The power amplifier circuit further includes:
[0059] A radio frequency switch 60, which is disposed between the bridge coupler 20 and the matching load 30, wherein an input end of the radio frequency switch 60 is connected to an isolation end of the bridge coupler 20, and a first output end of the radio frequency switch 60 is connected to one end of the matching load 30;
[0060] A low noise amplifier LNA, one end of the low noise amplifier LNA is connected to the second output end of the RF switch 60 .
[0061] It should be noted that the power amplifier circuit in this embodiment can realize the transmitting function and the receiving function. When realizing the transmitting function (TX, Transmit), the RF signal is input from the power amplifier 10, and is evenly divided into two output RF signals through the bridge coupler 20, and then output respectively through the first filtering structure 40 and the second filtering structure 50. At this time, the phases of the first adjustable phase shifter 412 and the second adjustable phase shifter 512 are 0° and -90° respectively. At the same time, the input end of the RF switch 60 is connected to the first output end, so that the isolation end of the bridge coupler 20 is connected to the matching load 30, and the matching load 30 plays a role. The function of matching and absorbing reflected RF signals; when implementing the receiving function (RX, Receive), the RF signal is input from the first filter structure 40 and the second filter structure 50, at which time the phases of the first adjustable phase shifter 412 and the second adjustable phase shifter 512 are -90° and 0° respectively, and the input end of the RF switch 60 is turned on with the second output end, so that the isolation end of the bridge coupler 20 is connected to the low noise amplifier LNA, and the input RF signal reaches the isolation end through the through port and the coupling port of the bridge coupler 20, and the low noise amplifier LNA is used to amplify the received RF signal and output it to an external device. This embodiment corresponds to the TDD power amplifier architecture of the power amplifier circuit, and an RF switch 60 is added between the isolation end of the bridge coupler 20 and the matching load 30. When the TDD function design needs to be implemented, the isolation end of the bridge coupler 20 is connected to the low noise amplifier LNA after being connected to the RF switch 60, and the low noise amplifier LNA is used to amplify the received signal.
[0062] As an example, the first adjustable phase shifter 412 and the second adjustable phase shifter 512 in this embodiment can be an adjustable device consisting of two phase shifters plus a switch, or can be an adjustable device formed by a phase shifter with a built-in switching function module. In addition, any implementation method that can enable the phase shifter to have a phase switching function is included in the scope of the adjustable phase shifter, and this embodiment does not limit this.
[0063] As an example, the first adjustable phase shifter 412 and the second adjustable phase shifter 512 in this embodiment are not necessary devices. They are introduced to ensure that the signal directions between the antenna elements are consistent. By changing the antenna installation direction and other means, the two adjustable phase shifters can also be removed and the signal reflection problem caused by the deterioration of standing waves at the antenna port can be solved.
[0064] In some feasible embodiments, the input end of the first filter 401 is connected to the through port, the output end of the first filter 401 is connected to the input end of the first adjustable phase shifter 412, the input end of the second filter 501 is connected to the coupling port, and the output end of the second filter 501 is connected to the input end of the second adjustable phase shifter 512; or, the input end of the first adjustable phase shifter 412 is connected to the through port, the output end of the first adjustable phase shifter 412 is connected to the input end of the first filter 401, the input end of the second adjustable phase shifter 512 is connected to the coupling port, and the output end of the second adjustable phase shifter 512 is connected to the input end of the second filter 501.
[0065] As an example, in this embodiment, an orthogonal hybrid bridge coupler QHBC is used to replace the final circulator to ensure good reverse isolation characteristics of the device connection end face, and at the same time replaces the one-to-two power divider; the signal output by the PA is fed into the input end of the bridge coupler 20, and the two output ends of the bridge coupler 20 are respectively connected to the filter and the adjustable phase shifter for output, and the positions of the filter and the adjustable phase shifter can be swapped at the same time, such as Fig.10 and Fig.11 shown.
[0066] In some feasible embodiments, the output end of the first filtering structure 40 is connected to the output end of the second filtering structure 50, and the first RF signal and the second RF signal are combined and output.
[0067] It should be noted that when the above-mentioned power amplifier circuit is applied to a single-element antenna scenario, the signals at the two output ends of the bridge coupler 20 are combined and output after passing through the first filtering structure 40 and the second filtering structure 50 respectively, which can be regarded as the FDD power amplifier architecture of the power amplifier circuit.
[0068] Reference Fig.12 In some feasible embodiments, the power amplifier circuit further includes:
[0069] A first power distributor 70, wherein an input end of the first power distributor 70 is connected to the through port, and an output end of the first power distributor 70 is connected to a plurality of groups of the first filtering structures 40;
[0070] A second power distributor 80, wherein an input end of the second power distributor 80 is connected to the coupling port, and an output end of the second power distributor 80 is connected to a plurality of groups of the second filtering structures 50;
[0071] The first power distributor 70 and the second power distributor 80 are of the same model.
[0072] It should be noted that the power amplifier circuit proposed in this embodiment can be applied to broadband multi-band working scenarios. Since the bridge coupler 20 evenly divides the amplified RF signal input by the power amplifier 10 into two output RF signals, the two output ends of the bridge coupler 20 need to be connected to power dividers of the same model to ensure the consistency of each output sub-signal. Similarly, the number of first filter structures 40 connected to the first power divider 70 is the same as the number of second filter structures 50 connected to the second power divider 80.
[0073] As an example, in this embodiment, the power divider can be in the form of a one-to-two power divider, a one-to-four power divider, or a one-to-eight power divider, etc., and this embodiment does not make any specific limitation to this.
[0074] This embodiment proposes a power amplifier circuit, which can use the electrical characteristics of reverse isolation of the input port of the bridge coupler to replace the final-stage circulator, reduce the insertion loss introduced by the final-stage circulator, improve the final-stage output power and final-stage efficiency, while reducing the size and cost, and reducing the impact on DPD (Digital Pre-Distortion).
[0075] In addition, the present application also provides an electronic device, referring to Fig.13 The electronic device 01 includes the power amplifier circuit 02 proposed in the above embodiment.
[0076] Those skilled in the art will understand that Fig.13 The structure shown in the figure does not constitute a limitation on the electronic device 01, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.
[0077] The electronic device proposed in this embodiment and the power amplifier circuit proposed in the above embodiments belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to any of the above embodiments, and this embodiment has the same beneficial effects as the above power amplifier circuit embodiments.
[0078] It should be noted that the technical solutions of the various embodiments of the embodiments of the present application can be combined with each other, but it must be based on the fact that it can be implemented by technical personnel in this field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present application.
[0079] The above are only preferred embodiments of the embodiments of the present application, and are not intended to limit the patent scope of the embodiments of the present application. Any equivalent structure or equivalent process transformation made using the description and drawings of the embodiments of the present application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the embodiments of the present application.
Claims
1. A power amplifier circuit, characterized in that: The power amplifier circuit comprises: Power amplifier; A bridge coupler, wherein the input end of the bridge coupler is connected to the output end of the power amplifier, and the bridge coupler is used to evenly divide the amplified radio frequency signal input by the power amplifier into two output radio frequency signals, and output one output radio frequency signal through two output ends respectively; A matching load, one end of the matching load is connected to the isolation end of the bridge coupler, and the other end of the matching load is grounded.
2. The power amplifier circuit according to claim 1, characterized in that: The two output ends include: a through port and a coupling port; the power amplifier circuit also includes: a first filtering structure, wherein an input end of the first filtering structure is connected to the through port, and the first filtering structure is used to filter the output RF signal output by the through port and output a first RF signal; A second filtering structure, wherein the input end of the second filtering structure is connected to the coupling port, and the second filtering structure is used to filter the other output RF signal output by the coupling port and output a second RF signal.
3. The power amplifier circuit according to claim 2, characterized in that: The first filtering structure comprises a first filter, wherein an input end of the first filter is connected to the through port; The second filtering structure includes a second filter, and an input end of the second filter is connected to the coupling port.
4. The power amplifier circuit according to claim 2, characterized in that: The first filtering structure includes a first filter and a first phase shifter, the phase of the first phase shifter is -270°, wherein the input end of the first filter is connected to the through port, the output end of the first filter is connected to the input end of the first phase shifter, or the input end of the first phase shifter is connected to the through port, and the output end of the first phase shifter is connected to the input end of the first filter; The second filtering structure includes a second filter, and an input end of the second filter is connected to the coupling port.
5. The power amplifier circuit according to claim 2, characterized in that: The first filtering structure comprises a first filter, wherein an input end of the first filter is connected to the through port; The second filtering structure includes a second filter and a second phase shifter, the phase of the second phase shifter is -90°, wherein the input end of the second filter is connected to the coupling port, and the output end of the second filter is connected to the input end of the second phase shifter, or the input end of the second phase shifter is connected to the coupling port, and the output end of the second phase shifter is connected to the input end of the second filter.
6. The power amplifier circuit according to claim 2, characterized in that: The first filtering structure includes a first filter and a first adjustable phase shifter. When the transmitting function is realized, the phase of the first adjustable phase shifter is 0°, and when the receiving function is realized, the phase of the first adjustable phase shifter is -90°; The second filtering structure includes a second filter and a second adjustable phase shifter. When the transmitting function is realized, the phase of the second adjustable phase shifter is -90°, and when the receiving function is realized, the phase of the second adjustable phase shifter is 0°; The power amplifier circuit also includes: A radio frequency switch, wherein the radio frequency switch is arranged between the bridge coupler and the matching load, the input end of the radio frequency switch is connected to the isolation end of the bridge coupler, and the first output end of the radio frequency switch is connected to one end of the matching load; A low noise amplifier, one end of which is connected to the second output end of the radio frequency switch.
7. The power amplifier circuit according to claim 6, characterized in that: The input end of the first filter is connected to the through port, the output end of the first filter is connected to the input end of the first adjustable phase shifter, the input end of the second filter is connected to the coupling port, and the output end of the second filter is connected to the input end of the second adjustable phase shifter; or, The input end of the first adjustable phase shifter is connected to the through port, the output end of the first adjustable phase shifter is connected to the input end of the first filter, the input end of the second adjustable phase shifter is connected to the coupling port, and the output end of the second adjustable phase shifter is connected to the input end of the second filter.
8. The power amplifier circuit according to any one of claims 3 to 7, characterized in that: The output end of the first filtering structure is connected to the output end of the second filtering structure, and the first radio frequency signal and the second radio frequency signal are combined and output.
9. The power amplifier circuit according to any one of claims 3 to 7, characterized in that: The power amplifier circuit also includes: A first power distributor, wherein an input end of the first power distributor is connected to the through port, and an output end of the first power distributor is connected to a plurality of groups of the first filtering structures; A second power distributor, wherein an input end of the second power distributor is connected to the coupling port, and an output end of the second power distributor is connected to a plurality of groups of the second filtering structures; The first power distributor and the second power distributor are of the same model.
10. An electronic device, characterized in that: The electronic device comprises the power amplifier circuit according to any one of claims 1 to 9.