Power amplifier and electronic device

Abstract

The application provides a power amplifier and an electronic device, the power amplifier meets: a difference between a load impedance of a main amplifier and a load impedance of a first peak value amplifier is less than a predetermined threshold, and the load impedance of the main amplifier and the load impedance of the first peak value amplifier are both greater than a load impedance of a second peak value amplifier; a transmission line between an output end of the main amplifier and an output end of the first peak value amplifier is a first transmission line, a transmission line between the output end of the first peak value amplifier and an output end of the second peak value amplifier is a second transmission line, and a characteristic impedance of the first transmission line is greater than a characteristic impedance of the second transmission line. In different states of the main amplifier, the actual load impedance of the main amplifier remains unchanged, avoiding the problem that in the prior art, the actual load impedance of the main amplifier is changed due to active load traction, different load impedances cause the amplifier to present different phases, and then cause additional phase distortion, and ensuring that the performance of the amplifier is good.

Description

Technical Field

[0001] This application relates to the field of amplifiers, and more specifically, to a power amplifier and electronic device. Background Technology

[0002] Doherty power amplifiers, as a common power amplifier architecture, can provide high-efficiency amplification for modulated signals with high peak-to-average power ratio. The traditional Doherty amplifier relies on active load pulling. The function of active load pulling is to use the gradually increasing output current generated by the peak amplifier to modulate the main amplifier as the input power increases, so that the load impedance of the main amplifier gradually decreases, thereby achieving high-efficiency amplification in the backoff state and full-power output in the saturation state. However, active load pulling changes the load impedance of the main amplifier, and different load impedances will cause the amplifier to present different phases, thus introducing additional phase distortion.

[0003] For example Figure 1 Taking the two-channel amplifier shown as an example, it mainly includes a main amplifier 10, a first peak amplifier 20, a first combiner 50, a combining point 60, a load 70, a power divider 80, a phase shifting network 90, and an output matching network 100. The equivalent model of its main amplifier 10 is as follows: Figure 2 As shown, the transistor consists of a voltage-controlled current source g m V gs Input capacitor Cin, output capacitor Cout, and input resistance r g The signal source consists of a voltage source V. S and its internal resistance Z S The input is a parallel load Y. L The input capacitance Cin and the output capacitance Cout also take into account the gate-to-drain capacitance C under the influence of the Miller effect. gd Finally, the voltage phase at the load end is derived as follows:

[0004] It can be seen that, in addition to the nonlinear parameters of the transistor itself, C gs / C gd / g m In addition, the output phase also depends on the load impedance G. L As mentioned earlier, the function of active load traction is to modulate the load impedance, and therefore it has a significant impact on phase distortion.

[0005] Therefore, there is an urgent need for a way to avoid phase distortion caused by active load traction.

[0006] The information disclosed above in the background section is only intended to enhance the understanding of the background art of the art described herein. Therefore, the background art may contain certain information that does not constitute prior art known to those skilled in the art in this country. Summary of the Invention

[0007] The main objective of this application is to provide a power amplifier and electronic device to solve the phase distortion problem caused by active load pulling in the prior art.

[0008] According to one aspect of the present invention, a power amplifier is provided, the power amplifier including a main amplifier, a first peak amplifier, and a second peak amplifier connected in parallel, wherein the difference between the load impedance of the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier; the transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is a first transmission line, the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is a second transmission line, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line.

[0009] Optionally, the main amplifier controls the load at maximum efficiency, and both the first peak amplifier and the second peak amplifier control the load at maximum power.

[0010] Optionally, the load impedances of the main amplifier, the first peak amplifier, and the second peak amplifier satisfy a ratio of 2:2:1.

[0011] Optionally, the characteristic impedance of the first transmission line is twice the characteristic impedance of the second transmission line.

[0012] Optionally, the characteristic impedance of the first transmission line is equal to the load impedance of the main amplifier.

[0013] Optionally, the power amplifier further includes a first combiner, a second combiner, and a combining point. The input terminal of the first combiner is connected to the output terminal of the main amplifier and the output terminal of the first peak amplifier, respectively. The input terminal of the second combiner is connected to the output terminal of the first combiner and the output terminal of the second peak amplifier, respectively. The input terminal of the combining point is connected to the output terminal of the second combiner. The output terminal of the combining point is used to connect a load. The load impedance of the main amplifier is four times the load impedance of the combining point.

[0014] Optionally, the load impedance of the main amplifier is equal to the optimal load resistance of the main amplifier.

[0015] Optionally, the main amplifier, the first peak amplifier, and the second peak amplifier each include one of a Si-based transistor device and a GaN-based transistor device.

[0016] Optionally, the power amplifier further includes a power divider, the output of which is connected to the input of the main amplifier, the input of the first peak amplifier, and the input of the second peak amplifier, respectively. The power divider is used to distribute the input signal to be amplified.

[0017] According to another aspect of this application, an electronic device is also provided, the electronic device comprising any of the power amplifiers described herein.

[0018] Applying the technical solution of this application, in the power amplifier, the difference between the load impedance of the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier; the transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is a first transmission line, the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is a second transmission line, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line. Compared to the phase distortion problem caused by active load pulling in the prior art, the power amplifier of this application uses the first transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier, and the second transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier. Since the difference in load impedance between the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line, the actual load impedance of the main amplifier remains constant under different states. This avoids the problem in the prior art where the actual load impedance of the main amplifier changes due to active load pulling, and different load impedances cause the amplifier to exhibit different phases, thus causing additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art and ensures better amplifier performance. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0020] Figure 1 A circuit diagram of a two-channel amplifier according to this application is shown;

[0021] Figure 2 A schematic diagram of the equivalent model of the two amplifiers according to this application is shown;

[0022] Figure 3 A circuit diagram of a three-channel amplifier according to this application is shown;

[0023] Figure 4 A schematic diagram of the equivalent model of the three-channel amplifier according to this application in the fallback state is shown;

[0024] Figure 5 A schematic diagram of the equivalent model of the three-channel amplifier according to this application in saturation state is shown;

[0025] Figure 6 A schematic diagram showing the variation trend of load impedance and output power of the three-channel amplifier according to this application is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Main amplifier; 20. First peak amplifier; 30. Second peak amplifier; 40. First combiner; 50. Second combiner; 60. Combining point; 70. Load; 80. Power divider; 90. Phase shifting network; 100. Output matching network. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Furthermore, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0032] As mentioned in the background section, there is a phase distortion problem in the prior art due to active load pulling. In order to solve the above problem, a typical embodiment of this application provides a power amplifier and electronic device.

[0033] According to a typical embodiment of this application, a power amplifier is provided, such as... Figure 3 As shown, the power amplifier includes a main amplifier 10, a first peak amplifier 20, and a second peak amplifier 30 connected in parallel. The difference between the load impedance of the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier. The transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is a first transmission line, and the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is a second transmission line. The characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line.

[0034] In the aforementioned power amplifier, the difference between the load impedance of the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier; the transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is a first transmission line, and the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is a second transmission line, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line. Compared to the phase distortion problem caused by active load pulling in the prior art, the power amplifier of this application uses a first transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier, and a second transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier. Since the difference in load impedance between the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line, the actual load impedance of the main amplifier remains constant under different states. This avoids the problem in the prior art where active load pulling changes the actual load impedance of the main amplifier, causing different phases and resulting in additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art and ensures better amplifier performance.

[0035] Specifically, the aforementioned main amplifier mainly includes a back-off state and a saturation state.

[0036] According to a specific embodiment of this application, the main amplifier controls the load at maximum efficiency, and both the first peak amplifier and the second peak amplifier control the load at maximum power. Because the main amplifier controls the load at maximum efficiency, it ensures that the main amplifier provides high-efficiency amplification in the backoff state. Furthermore, because the first peak amplifier and the second peak amplifier control the load at maximum power, they reduce power leakage in the backoff state.

[0037] To further ensure the better performance of the amplifier, according to another specific embodiment of this application, the load impedances of the main amplifier, the first peak amplifier, and the second peak amplifier satisfy a ratio of 2:2:1. Since the load impedances of the main amplifier, the first peak amplifier, and the second peak amplifier satisfy a ratio of 2:2:1, it is further ensured that the actual load impedance of the main amplifier remains constant under different states. This avoids the problem in the prior art where the actual load impedance of the main amplifier is changed by active load pulling, and different load impedances cause the amplifier to exhibit different phases, thus causing additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art, further ensuring the better performance of the amplifier.

[0038] Of course, the relationship between the load impedances of the main amplifier, the first peak amplifier, and the second peak amplifier is not limited to 2:2:1; it can also be 2:1.9:1, or 1.9:2:1, etc.

[0039] According to another specific embodiment of this application, the characteristic impedance of the first transmission line is twice the characteristic impedance of the second transmission line. Since the characteristic impedance of the first transmission line is twice that of the second transmission line, it further ensures that the actual load impedance of the main amplifier remains constant under different states. This avoids the problem in the prior art where the actual load impedance of the main amplifier changes due to active load pulling, and different load impedances cause the amplifier to exhibit different phases, thus causing additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art, further ensuring better performance of the amplifier.

[0040] According to a specific embodiment of this application, the characteristic impedance of the first transmission line is equal to the load impedance of the main amplifier. Since the characteristic impedance of the first transmission line is equal to the load impedance of the main amplifier, and the characteristic impedance of the first transmission line is twice the characteristic impedance of the second transmission line, it further ensures that the actual load impedance of the main amplifier remains constant under different states. This avoids the problem in the prior art where the actual load impedance of the main amplifier is changed by active load pulling, and different load impedances cause the amplifier to exhibit different phases, thus causing additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art, further ensuring better performance of the amplifier.

[0041] Specifically, Figure 4 as well as Figure 5 for Figure 3The equivalent schematic diagram of the combiner network shown in the circuit diagram is as follows, wherein, Figure 4 This is the equivalent principle diagram in the rollback state. Figure 5 The equivalent principle diagram under saturation is shown below. Figure 4 As shown, in the back-off state, both the first peak amplifier and the second peak amplifier are in the off state, so the main amplifier 10 is directly connected to the characteristic impedance Z of the first transmission line. TL1 The characteristic impedance Z of the second transmission line mentioned above. TL2 and the impedance Z at the aforementioned junction point 60 L Connected, since the load impedances of the first main amplifier, the first peak amplifier, and the second peak amplifier satisfy 2:2:1, and the characteristic impedance of the first transmission line is twice the characteristic impedance of the second transmission line, and the load impedance of the main amplifier is equal to the characteristic impedance of the first transmission line, then Z satisfies... M_MXE =Z TL1 =0.5*Z TL2 Among them, Z M_MXE Given the load impedance of the aforementioned main amplifier, Z is calculated. L =0.25*Z M_MXE ,like Figure 5 As shown, in the saturation state, the first peak amplifier 20 and the second peak amplifier 30 are turned on, and due to Z... P1_MXP =Z TL1 =Z M_MXE Z P2_MXP =Z TL2 =Z P1_MXP / / Z M_MXE Among them, Z P1_MXP Z is the load impedance of the first peak amplifier 20 mentioned above. P2_MXP Given the load impedance of the second peak amplifier 30 mentioned above, Z can be calculated. L =0.5*Z P2_MXP =0.25*Z M_MXE Therefore, the aforementioned combiner network can achieve impedance matching in both the back-off and saturation states, and ensures that the load impedance of the main amplifier 10 is always Z. M_MXE Active load modulation was not performed.

[0042] In addition, such as Figure 6 As shown in the figure, the load impedance of the main amplifier, the first peak amplifier, and the second peak amplifier varies with the output power, where Z... M Z is the load impedance of the aforementioned main amplifier. P1 Z is the load impedance of the first peak amplifier mentioned above. P2Let be the load impedance of the second peak amplifier. It can be seen that the load impedance of the main amplifier remains constant throughout the entire power range. Both the first peak amplifier and the second peak amplifier gradually return to their respective impedance values ​​from the open circuit state. The load impedance of the main amplifier and the load impedance of the first peak amplifier eventually become the same. Furthermore, the load impedances of the main amplifier and the first peak amplifier are both twice the load impedance of the second peak amplifier.

[0043] According to another specific embodiment of this application, such as Figure 3 As shown, the power amplifier further includes a first combiner 40, a second combiner 50, and a combining point 60. The input terminal of the first combiner 40 is connected to the output terminal of the main amplifier 10 and the output terminal of the first peak amplifier 20, respectively. The input terminal of the second combiner 50 is connected to the output terminal of the first combiner 40 and the output terminal of the second peak amplifier 30, respectively. The input terminal of the combining point 60 is connected to the output terminal of the second combiner 50, and the output terminal of the combining point 60 is used to connect the load 70. The load impedance of the main amplifier 10 is four times the load impedance of the combining point 60. Because the load impedance of the main amplifier is four times the load impedance of the combining point, the value of the main amplifier remains unchanged regardless of whether it is in saturation or backoff state. The combiner network achieves impedance matching in both backoff and saturation states, further ensuring the good performance of the amplifier.

[0044] In one specific embodiment, the power amplifier described above in this application, through appropriate selection of amplifier size and combiner network design, ensures that the load impedance of the main amplifier is constant, thereby avoiding phase distortion caused by active load pull.

[0045] According to another specific embodiment of this application, the load impedance of the main amplifier is equal to the optimal load resistance of the main amplifier. Since the load impedance of the main amplifier is equal to the optimal load resistance, the load impedance of the main amplifier is guaranteed to be constant. This avoids the problem in the prior art where the actual load impedance of the main amplifier is altered by an active load, and different load impedances cause the amplifier to exhibit different phases, leading to additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art and ensures better performance of the amplifier.

[0046] According to a specific embodiment of this application, the main amplifier, the first peak amplifier, and the second peak amplifier all include one of Si-based transistor devices and GaN-based transistor devices.

[0047] According to another specific embodiment of this application, such as Figure 3 As shown, the power amplifier also includes a power divider 80. The output of the power divider 80 is connected to the input of the main amplifier 10, the input of the first peak amplifier 20, and the input of the second peak amplifier 30, respectively. The power divider 80 is used to distribute the input signal to be amplified. Since the power amplifier also includes the power divider, and the output of the power divider is connected to the input of the main amplifier, the input of the first peak amplifier, and the input of the second peak amplifier, it is ensured that the RF input signal to be amplified can be divided into three signals to be amplified and sent to the main amplifier, the first peak amplifier, and the second peak amplifier, thus ensuring that the power amplifier can achieve its performance.

[0048] Specifically, such as Figure 3 As shown, the power amplifier further includes a phase-shifting network 90 and an output matching network 100. The phase-shifting network 90 includes a first phase-shifting network and a second phase-shifting network. The input terminal of the first phase-shifting network is connected to the output terminal of the power divider 80, and the output terminal of the first phase-shifting network is connected to the input terminal of the first peak amplifier 20. The input terminal of the second phase-shifting network is connected to the output terminal of the power divider 80, and the output terminal of the second phase-shifting network is connected to the input terminal of the second peak amplifier 30. The input terminal of the output matching network 100 is connected to the output terminal of the second combiner 50, and the output matching network 100 is located on the side of the combining point 60 closer to the load 70. The output terminal of the output matching network 100 is connected to the input terminal of the load. The first phase-shifting network is used to ensure that the signal output by the first peak amplifier is phase-aligned with the signals output by the other two amplifiers at the combining point. The second phase-shifting network is used to ensure that the signal output by the second peak amplifier is phase-aligned with the signals output by the other two amplifiers at the combining point. The output matching network is used to transmit the signal output by the second combiner to the load.

[0049] According to embodiments of this application, an electronic device is also provided, which includes any of the power amplifiers described above.

[0050] The aforementioned electronic device includes any of the aforementioned power amplifiers. Compared to the phase distortion problem caused by active load pulling in the prior art, in the electronic device of this application, the transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is the first transmission line, and the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is the second transmission line. Since the difference between the load impedance of the main amplifier and the first peak amplifier is less than the predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line, the actual load impedance of the main amplifier remains unchanged under different states. This avoids the problem in the prior art where the actual load impedance of the main amplifier changes due to active load pulling, and different load impedances cause the amplifier to exhibit different phases, thus causing additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art and ensures better performance of the amplifier.

[0051] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0052] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0053] 1) In the power amplifier described above in this application, the difference between the load impedance of the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier; the transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is a first transmission line, the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is a second transmission line, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line. Compared to the phase distortion problem caused by active load pulling in the prior art, the power amplifier of this application uses a first transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier, and a second transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier. Since the difference in load impedance between the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line, the actual load impedance of the main amplifier remains constant under different states. This avoids the problem in the prior art where active load pulling changes the actual load impedance of the main amplifier, causing different phases and resulting in additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art and ensures better amplifier performance.

[0054] 2) The electronic device described in this application includes any of the aforementioned power amplifiers. Compared to the phase distortion problem caused by active load pulling in the prior art, in the electronic device of this application, the transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is the first transmission line, and the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is the second transmission line. Since the difference between the load impedance of the main amplifier and the first peak amplifier is less than the predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier, and the characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line, the actual load impedance of the main amplifier remains unchanged under different states. This avoids the problem in the prior art where the actual load impedance of the main amplifier changes due to active load pulling, and different load impedances cause the amplifier to exhibit different phases, thus causing additional phase distortion. This solves the phase distortion problem caused by active load pulling in the prior art and ensures better performance of the amplifier.

[0055] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A power amplifier, comprising a main amplifier, a first peak amplifier, and a second peak amplifier connected in parallel, characterized in that, include: The difference between the load impedance of the main amplifier and the first peak amplifier is less than a predetermined threshold, and both the load impedance of the main amplifier and the load impedance of the first peak amplifier are greater than the load impedance of the second peak amplifier. The transmission line between the output terminal of the main amplifier and the output terminal of the first peak amplifier is a first transmission line, and the transmission line between the output terminal of the first peak amplifier and the output terminal of the second peak amplifier is a second transmission line. The characteristic impedance of the first transmission line is greater than the characteristic impedance of the second transmission line. The power amplifier further includes a power divider, a first combiner, a second combiner, and a combining point. The output terminal of the power divider is connected to the input terminal of the main amplifier, the input terminal of the first peak amplifier, and the input terminal of the second peak amplifier, respectively. The power divider is used to distribute the input signal to be amplified. The input terminal of the first combiner is connected to the output terminal of the main amplifier and the output terminal of the first peak amplifier, respectively. The input terminal of the second combiner is connected to the output terminal of the first combiner and the output terminal of the second peak amplifier, respectively. The input terminal of the combining point is connected to the output terminal of the second combiner, and the output terminal of the combining point is used to connect to the load.

2. The power amplifier according to claim 1, characterized in that, The main amplifier controls the load at maximum efficiency, and both the first peak amplifier and the second peak amplifier control the load at maximum power.

3. The power amplifier according to claim 1, characterized in that, The load impedances of the main amplifier, the first peak amplifier, and the second peak amplifier satisfy a ratio of 2:2:

1.

4. The power amplifier according to claim 1, characterized in that, The characteristic impedance of the first transmission line is twice the characteristic impedance of the second transmission line.

5. The power amplifier according to claim 1, characterized in that, The characteristic impedance of the first transmission line is equal to the load impedance of the main amplifier.

6. The power amplifier according to claim 1, characterized in that, The load impedance of the main amplifier is four times the load impedance of the junction point.

7. The power amplifier according to claim 1, characterized in that, The load impedance of the main amplifier is equal to the optimal load resistance of the main amplifier.

8. The power amplifier according to claim 1, characterized in that, The main amplifier, the first peak amplifier, and the second peak amplifier all include one of Si-based transistor devices and GaN-based transistor devices.

9. An electronic device, characterized in that, The electronic device includes the power amplifier according to any one of claims 1 to 8.

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