Power amplification circuit and electronic device

Abstract

Embodiments of the present application belong to the technical field of power and electronics, and disclose a power amplification circuit and an electronic device. The power amplification circuit comprises: a power amplifier, an input end of the power amplifier receiving an input radio frequency signal, and the power amplifier being configured to perform power amplification on the input radio frequency signal and output the amplified radio frequency signal; a bridge coupler, an input end of the bridge coupler being connected to an output end of the power amplifier, and the bridge coupler being configured to evenly divide the amplified radio frequency signal input from the power amplifier into two output radio frequency signals, and respectively output the two output radio frequency signals via two output ends; a matched load, one end of the matched load being connected to an isolation end of the bridge coupler, the other end of the matched load being connected to ground, and the matched load being configured to assist the bridge coupler in isolating a reflected radio frequency signal.

Description

Power amplifier circuits and electronic equipment

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311290561.5 filed on September 28, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] 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

[0004] In wireless systems, final-stage circulators are widely used to achieve functions such as transmit-receive separation, improve transmit-receive isolation, protect the transmitter, and protect the power amplifier.

[0005] At present, the final-stage circulator in the broadband power amplifier architecture has problems such as large size, high insertion loss, and high cost. This will greatly affect the final-stage efficiency and output power, making it difficult for product indicators to meet design requirements.

[0006] Summary of the Invention

[0007] The main purpose of the embodiments of the present application is to provide a power amplifier circuit and an electronic device.

[0008] To achieve the above-mentioned objectives, an embodiment of the present application provides a power amplifier circuit, which includes: a power amplifier, wherein the input end of the power amplifier receives an input RF signal, and the power amplifier is used to power amplify the input RF signal and output the amplified RF signal; 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 RF signal input by the power amplifier into two output RF signals, and output one output RF signal through two output ends respectively; a matching load, wherein 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.

[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. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. 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.

[0011] FIG1 is a schematic diagram of the structure of a power amplifier using a circulator in an FDD architecture in the related art;

[0012] FIG2 is a schematic diagram of the structure of a power amplifier using a circulator in a TDD architecture in the related art;

[0013] FIG3 is a schematic structural diagram of a power amplifier circuit provided in an embodiment of the present application;

[0014] FIG4 is a schematic structural diagram of another power amplifier circuit provided in an embodiment of the present application;

[0015] FIG5 is 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;

[0016] FIG6 is a schematic diagram of another detailed structure of the first filtering structure and the second filtering structure involved in another power amplifier circuit provided in an embodiment of the present application;

[0017] FIG7 is a schematic structural diagram of the first filter 401 and the first phase shifter 402 in FIG6 in which positions are swapped;

[0018] FIG8 is 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;

[0019] FIG9 is a schematic structural diagram of the second filter 501 and the second phase shifter 502 in FIG8 in which positions are swapped;

[0020] FIG10 is a schematic structural diagram of another power amplifier circuit provided in an embodiment of the present application;

[0021] FIG11 is a schematic structural diagram of the simultaneous exchange of positions of the filter and the adjustable phase shifter in FIG10 ;

[0022] FIG12 is a schematic structural diagram of another power amplifier circuit provided in an embodiment of the present application;

[0023] FIG13 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.

[0024] The realization of the objectives, 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.

[0025] Description of Figure Numbers: DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the embodiments of this application.

[0027] 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 various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] 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 suggesting their relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of such 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 throughout the text is to include three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which both A and B are satisfied.

[0029] In the embodiments of the present application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal connection between two elements or the interaction between two elements, unless otherwise specified. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0030] References to "one embodiment" or "some embodiments" in the description 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. Therefore, the phrases "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. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0031] In wireless systems, final-stage circulators are widely used to achieve transmit-receive separation, improve transmit-receive isolation, and protect transmitters and power amplifiers. Figure 1 shows a block diagram of a power amplifier with a final-stage circulator in a traditional FDD (Frequency Division Duplexing) architecture, and Figure 2 shows a block diagram of a power amplifier with a final-stage circulator in a traditional TDD (Time Division Duplexing) architecture. Pin represents the input signal, PA represents the power amplifier, Circulator represents the circulator, Load represents the load, Filter represents the filter, LNA represents the low-noise amplifier, Power Divider represents the power divider (a one-to-two power divider in both Figures 1 and 2), and Pout1 and Pout2 represent the two output signals. However, current broadband circulators suffer from large size, high insertion loss, and high cost, making it difficult to meet design specifications and significantly impacting final-stage efficiency and output power.

[0032] Based on this, the embodiments of the present application provide a power amplifier circuit and electronic device, which ensures good reverse isolation characteristics by adopting a bridge coupler to replace the final-stage circulator, while also replacing the one-to-two power splitter, 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.

[0033] 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.

[0034] An embodiment of the present application provides a power amplifier circuit. Referring to Figure 3, Figure 3 is a structural schematic diagram of a power amplifier circuit provided by an embodiment of the present application, and the power amplifier circuit includes: a power amplifier 10; 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 the two output ends respectively; a matching load 30, wherein one end of the matching load 30 is connected to the isolation end of the bridge coupler 20, and the other end of the matching load 30 is grounded.

[0035] In this embodiment, the input end of the power amplifier 10 is connected to the input RF signal, and the power amplifier 10 is used to power amplify the input RF signal and output the amplified RF signal; in this embodiment, the bridge coupler 20 is used to replace the final circulator to ensure good reverse isolation characteristics, and at the same time replaces the one-to-two power splitter. 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 wave at the two output ends is not good, the signal will be partially 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.

[0036] 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. This embodiment does not specifically limit its implementation method.

[0037] 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.

[0038] 4 , in some feasible embodiments, the two output ends of the bridge coupler 20 include a through port and a coupled port; the above-mentioned power amplification circuit further includes: a first filtering structure 40, the input end of the first filtering structure 40 is connected to the through port, and the first filtering structure 40 is used to filter the output RF signal of one path output by the through port and output a first RF signal; a second filtering structure 50, the input end of the second filtering structure 50 is connected to the coupled port, and the second filtering structure 50 is used to filter the other output RF signal of the coupled port and output a second RF signal.

[0039] 5 , in some feasible embodiments, the first filtering structure 40 includes a first filter 401 , the input end of which is connected to the through port; the second filtering structure 50 includes a second filter 501 , the input end of which is connected to the coupling port.

[0040] In this embodiment, the first filtering structure 40 and the second filtering structure 50 both include filters for filtering the output RF signal, 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 the standing wave at the antenna port can be solved by other means such as changing the antenna installation direction.

[0041] Although the number of filters in this embodiment is doubled compared to the conventional solution using a circulator in the related art, in low-power devices, the size and cost of the filter are much smaller than those of the circulator. Therefore, the power amplifier circuit with a de-circulator proposed in this embodiment is more cost-effective than the circuit architecture with a circulator in the related art.

[0042] 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, and 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; the second filtering structure 50 includes a second filter 501, and the input end of the second filter 501 is connected to the coupling port.

[0043] 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 direction between each antenna element is 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, as shown in Figures 6 and 7.

[0044] 8 , in some feasible embodiments, the first filtering structure 40 includes a first filter 401 , wherein the input end of the first filter 401 is connected to the through port;

[0045] 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.

[0046] 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 direction between each antenna element is 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, as shown in Figures 8 and 9.

[0047] 10 , in some feasible embodiments, the first filtering structure 40 includes a first filter 401 and a first adjustable phase shifter 412. When the transmission function is realized, the phase of the first adjustable phase shifter 412 is 0°, and when the reception function is realized, the phase of the first adjustable phase shifter 412 is -90°; the second filtering structure 50 includes a second filter 501 and a second adjustable phase shifter 512. When the transmission function is realized, the phase of the second adjustable phase shifter 512 is -90°, and when the reception function is realized, the phase of the second adjustable phase shifter 512 is 0°; the above-mentioned power amplifier circuit also includes: a radio frequency switch 60, which is arranged between the bridge coupler 20 and the matching load 30, the input end of the radio frequency switch 60 is connected to the isolation end of the bridge coupler 20, and the first output end of the radio frequency switch 60 is connected to one end of the matching load 30; and a low noise amplifier LNA, one end of the low noise amplifier LNA is connected to the second output end of the radio frequency switch 60.

[0048] The power amplifier circuit in this embodiment can realize the transmitting function and the receiving function. When realizing the transmitting function (TX, Transmit), the radio frequency signal is input from the power amplifier 10, and is evenly divided into two output radio frequency 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 radio frequency 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 matching and absorption role. The function of receiving the reflected RF signal; 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 this time, the phases of the first adjustable phase shifter 412 and the second adjustable phase shifter 512 are -90° and 0° respectively. The input end and the second output end of the RF switch 60 are turned on, so that the isolation end of the bridge coupler 20 is connected to the low-noise amplifier LNA. The input RF signal reaches the isolation end through the through port and the coupling port of the bridge coupler 20. 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. 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. The low-noise amplifier LNA is used to amplify the received signal.

[0049] As an example, the first adjustable phase shifter 412 and the second adjustable phase shifter 512 in this embodiment can be adjustable devices consisting of two phase shifters and a switch, or can be adjustable devices 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.

[0050] As an example, the first adjustable phase shifter 412 and the second adjustable phase shifter 512 in this embodiment are not necessary components. They are introduced to ensure that the signal directions between the antenna elements are consistent. By changing the antenna installation direction or 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.

[0051] 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.

[0052] As an example, in this embodiment, an orthogonal hybrid bridge coupler QHBC is used to replace the final-stage circulator to ensure good reverse isolation characteristics of the device connection end face, and at the same time replaces the one-to-two power splitter; 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, as shown in Figures 10 and 11.

[0053] 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.

[0054] When the power amplifier circuit is applied to a monopole antenna scenario, the signals at the two output ends of the bridge coupler 20 are respectively combined and output after passing through the first filtering structure 40 and the second filtering structure 50 , which can be regarded as the FDD power amplifier architecture of the power amplifier circuit.

[0055] Referring to Figure 12, in some feasible embodiments, the power amplification circuit further includes: a first power divider 70, the input end of the first power divider 70 is connected to the through port, and the output end of the first power divider 70 is connected to multiple groups of the first filtering structure 40; a second power divider 80, the input end of the second power divider 80 is connected to the coupling port, and the output end of the second power divider 80 is connected to multiple groups of the second filtering structure 50; wherein, the first power divider 70 and the second power divider 80 are of the same model.

[0056] 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 the output sub-signals. 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.

[0057] As an example, in this embodiment, the power divider may 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., which is not specifically limited in this embodiment.

[0058] This embodiment proposes a power amplifier circuit that can replace the final-stage circulator by utilizing the electrical characteristics of reverse isolation of the input port of a bridge coupler, thereby reducing the insertion loss introduced by the final-stage circulator, improving the final-stage output power and final-stage efficiency, while reducing size and cost, and reducing the impact on DPD (Digital Pre-Distortion).

[0059] In addition, an embodiment of the present application further provides an electronic device. Referring to FIG. 13 , the electronic device 01 includes the power amplifier circuit 02 proposed in the above embodiment.

[0060] Those skilled in the art will understand that the structure shown in FIG13 does not constitute a limitation on the electronic device 01 , and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0061] The electronic device proposed in this embodiment and the power amplifier circuit proposed in the above embodiments belong to the same inventive concept. 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.

[0062] The technical solutions of the various embodiments of the present application can be combined with each other, but they must be based on the fact that they 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 a combination of technical solutions does not exist and is not within the scope of protection required by the embodiments of the present application.

[0063] The above are only optional embodiments of the embodiments of the present application, and do not limit the patent scope of the embodiments of the present application. Any equivalent structure or equivalent process transformation made using the contents of 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, wherein: 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, wherein: 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, wherein: 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, wherein: 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, the input end of the second filter is connected to the Coupled port.

5. The power amplifier circuit according to claim 2, wherein: 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, wherein: 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, 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 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 second filter. The input terminal.

8. The power amplifier circuit according to any one of claims 3 to 7, wherein: 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, wherein: 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, wherein: The electronic device comprises the power amplifier circuit according to any one of claims 1 to 9.

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