Lumped in-phase power synthesis circuit and power amplifier

Abstract

The present invention relates to the field of wireless communication technology, and provides a lumped in-phase power synthesis circuit and a power amplifier, comprising a first signal input terminal, a second signal input terminal, an input impedance matching circuit, a first harmonic suppression circuit, a second harmonic suppression circuit, a first low-pass filter circuit, a second low-pass filter circuit, a high-pass filter circuit and a signal synthesis output terminal; the input impedance matching circuit is used to provide power supply and impedance matching; the first harmonic suppression circuit is used to filter the second harmonic of the signal output from the first terminal of the input impedance matching circuit; the second harmonic suppression circuit is used to filter the second harmonic of the signal output from the second terminal of the input impedance matching circuit; the first low-pass filter circuit is used to filter the signal output from the first terminal of the input impedance matching circuit. The lumped in-phase power synthesis circuit of the present invention has impedance transformation characteristics, and has the advantages of low cost, high isolation and high integration.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communication, and in particular to a lumped in-phase power synthesis circuit and a power amplifier. Background Art

[0002] In wireless communication systems, with the rapid development of 5G networks and Internet of Things (IoT) technologies, higher requirements are placed on the linear power of RF front-end modules. However, it is difficult for single-ended power amplifiers to output higher power, so power synthesis technology is needed. RF front-end modules in existing cellular communications usually use differential phase synthesis and 90° balanced phase synthesis.

[0003] At present, the differential structure usually adds bulky baluns at the input and output of the power amplifier, which increases the cost of chips and modules. In addition, the differential baluns used in 5G communications are generally poorly balanced, which is manifested as poor stability and isolation of the power amplifier. The 90° balanced phase synthesis used in the 5G communication RF front end often adopts a transformer-based 90° synthesis solution. Similar to the aforementioned differential synthesis, a large 90° coupler based on a transformer architecture is added to the input and output of the power amplifier. At the same time, the 90° coupler does not have the impedance transformation characteristic, and an impedance change circuit needs to be added separately, so it occupies a large area of ​​the chip and module; at the same time, it leads to higher costs. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the present invention proposes a lumped in-phase power synthesis circuit to solve the problem of high cost of the existing lumped in-phase power synthesis circuit.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, an embodiment of the present invention provides a lumped in-phase power synthesis circuit, including an input impedance matching circuit, a first harmonic suppression circuit, a second harmonic suppression circuit, a first low-pass filter circuit, a second low-pass filter circuit, and a high-pass filter circuit;

[0007] The first end of the input impedance matching circuit serves as the first signal input end of the lumped in-phase power synthesis circuit, and the second end of the input impedance matching circuit serves as the second signal input end of the lumped in-phase power synthesis circuit; the first end of the first harmonic suppression circuit is connected to the first end of the input impedance matching circuit; the second end of the first harmonic suppression circuit is grounded, the first end of the second harmonic suppression circuit is connected to the second end of the input impedance matching circuit, and the second end of the second harmonic suppression circuit is grounded; the input impedance matching circuit is used to provide power supply and impedance matching; the first harmonic suppression circuit is used to filter out the second harmonic of the signal output from the first end of the input impedance matching circuit; the second harmonic suppression circuit is used to filter out the second harmonic of the signal output from the second end of the input impedance matching circuit;

[0008] The input end of the first low-pass filter circuit is connected to the first end of the first harmonic suppression circuit, and the output end of the first low-pass filter circuit is connected to the first input end of the high-pass filter circuit; the input end of the second low-pass filter circuit is connected to the first end of the second harmonic suppression circuit, and the output end of the second low-pass filter circuit is connected to the second input end of the high-pass filter circuit, and the output end of the high-pass filter circuit serves as the signal synthesis output end of the lumped in-phase power synthesis circuit; the first low-pass filter circuit is used to filter the signal output from the first end of the input impedance matching circuit; the second low-pass filter circuit is used to filter the signal output from the second end of the input impedance matching circuit; the high-pass filter circuit is used to synthesize the signals respectively output by the first low-pass filter circuit and the second low-pass filter circuit and output them after filtering.

[0009] Preferably, the input impedance matching circuit includes a voltage source, a first inductor and a second inductor; the negative electrode of the voltage source is grounded, the positive electrode of the voltage source is respectively connected to the first end of the first inductor and the first end of the second inductor, the second end of the first inductor serves as the first end of the input impedance matching circuit; the second end of the second inductor serves as the second end of the input impedance matching circuit.

[0010] Preferably, the first harmonic suppression circuit includes a first capacitor and a third inductor; the first end of the first capacitor serves as the second end of the first harmonic suppression circuit, the second end of the first capacitor is connected to the first end of the third inductor, and the second end of the third inductor serves as the first end of the first harmonic suppression circuit;

[0011] The second harmonic suppression circuit includes a second capacitor and a fourth inductor; the first end of the second capacitor serves as the second end of the second harmonic suppression circuit, the second end of the second capacitor is connected to the first end of the fourth inductor, and the second end of the fourth inductor serves as the first end of the second harmonic suppression circuit.

[0012] Preferably, the first low-pass filter circuit includes a fifth inductor and a third capacitor; the first end of the fifth inductor serves as the input end of the first low-pass filter circuit, the second end of the fifth inductor is connected to the first end of the third capacitor and serves as the output end of the first low-pass filter circuit, and the second end of the third capacitor is grounded;

[0013] The second low-pass filter circuit includes a sixth inductor and a fourth capacitor; the first end of the sixth inductor serves as the input end of the second low-pass filter circuit, the second end of the sixth inductor is connected to the first end of the fourth capacitor and serves as the output end of the second low-pass filter circuit, and the second end of the fourth capacitor is grounded.

[0014] Preferably, the lumped in-phase power synthesis circuit further includes a seventh inductor and an eighth inductor; the second end of the third capacitor is connected in series with the seventh inductor and then grounded, and the second end of the fourth capacitor is connected in series with the eighth inductor and then grounded.

[0015] Preferably, the high-pass filter circuit includes a ninth inductor, a fifth capacitor and a sixth capacitor; the first end of the fifth capacitor serves as the first input end of the high-pass filter circuit, the first end of the sixth capacitor serves as the second input end of the high-pass filter circuit, the second end of the fifth capacitor is respectively connected to the first end of the ninth inductor and the second end of the sixth capacitor and serves as the output end of the high-pass filter circuit, and the second end of the ninth inductor is grounded.

[0016] Preferably, the lumped in-phase power synthesis circuit further includes a tenth inductor; a first end of the tenth inductor is respectively connected to the second end of the third capacitor and the second end of the fourth capacitor, and a second end of the tenth inductor is grounded.

[0017] Preferably, the lumped in-phase power synthesis circuit also includes a first resistor; the first end of the first resistor is connected to the output end of the first low-pass filter circuit, and the second end of the first resistor is connected to the output end of the second low-pass filter circuit.

[0018] In a second aspect, an embodiment of the present invention provides a power amplifier, the power amplifier comprising a signal source, a first amplifier, a second amplifier, and the lumped in-phase power synthesis circuit as described above;

[0019] The first end of the signal source is grounded, and the second end of the signal source outputs a radio frequency signal to the input end of the first amplifier and the input end of the second amplifier respectively. The output end of the first amplifier is connected to the first signal input end, and the output end of the second amplifier is connected to the second signal input end.

[0020] Compared with the related art, in the embodiments of the present invention, by directly connecting the signal source to the first amplifier and the second amplifier, compared with differential synthesis and 90° synthesis, the input end of the amplifier does not need to add any power distribution network, thereby simplifying the input end and reducing chip area and cost. At the same time, the output ends of the first amplifier and the second amplifier realize power synthesis output after passing through the in-phase power synthesis circuit; in addition, the first end of the input impedance matching circuit is used as the first signal input end of the lumped in-phase power synthesis circuit, and the second end of the input impedance matching circuit is used as the second signal input end of the lumped in-phase power synthesis circuit; the input impedance matching circuit is used to provide power supply and impedance matching; the first harmonic suppression circuit is used to filter the second harmonic of the signal output from the first end of the input impedance matching circuit; the second harmonic suppression circuit is used to filter the second harmonic of the signal output from the second end of the input impedance matching circuit; the first low-pass filter circuit is used to filter the signal output from the first end of the input impedance matching circuit; the second low-pass filter circuit is used to filter the signal output from the second end of the input impedance matching circuit; the high-pass filter circuit is used to synthesize the signals respectively output from the first low-pass filter circuit and the second low-pass filter circuit and output them after filtering; through corresponding impedance, filtering and resonance processing, the power amplifier has impedance transformation characteristics, and at the same time has the advantages of low cost, high isolation and high integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings. The above and other aspects of the present invention will become clearer and easier to understand through the detailed description made in conjunction with the following drawings. In the accompanying drawings:

[0022] Figure 1 A circuit diagram of a lumped in-phase power synthesis circuit provided in Embodiment 1 of the present invention;

[0023] Figure 2 A circuit diagram of a lumped in-phase power synthesis circuit provided in Embodiment 2 of the present invention;

[0024] Figure 3 A circuit diagram of a lumped in-phase power synthesis circuit provided in Embodiment 3 of the present invention;

[0025] Figure 4 A circuit diagram of a lumped in-phase power synthesis circuit provided in Embodiment 4 of the present invention;

[0026] Figure 5This is a circuit structure block diagram of a power amplifier provided in Embodiment 5 of the present invention.

[0027] Among them, 100, a lumped in-phase power synthesis circuit, 1, an input impedance matching circuit, 2, a first harmonic suppression circuit, 3, a second harmonic suppression circuit, 4, a first low-pass filter circuit, 5, a second low-pass filter circuit, 6, a high-pass filter circuit, 200, a power amplifier. DETAILED DESCRIPTION

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present application; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1

[0032] See also Figure 1 As shown, an embodiment of the present invention provides a lumped in-phase power synthesis circuit 100, including an input impedance matching circuit 1, a first harmonic suppression circuit 2, a second harmonic suppression circuit 3, a first low-pass filter circuit 4, a second low-pass filter circuit 5 and a high-pass filter circuit 6.

[0033] The first end of the input impedance matching circuit 1 serves as the first signal input end Input1 of the lumped in-phase power synthesis circuit 100, and the second end of the input impedance matching circuit 1 serves as the second signal input end Input2 of the lumped in-phase power synthesis circuit 100. The first end of the first harmonic suppression circuit 2 is connected to the first end of the input impedance matching circuit 1, and the first end of the second harmonic suppression circuit 3 is connected to the second end of the input impedance matching circuit 1; the input impedance matching circuit 1 is used to provide power supply and impedance matching. The first harmonic suppression circuit 2 is used to filter the second harmonic of the signal output from the first end of the input impedance matching circuit 1. The second harmonic suppression circuit 3 is used to filter the second harmonic of the signal output from the second end of the input impedance matching circuit 1.

[0034] The input end of the first low-pass filter circuit 4 is connected to the first end of the first harmonic suppression circuit 2; the output end of the first low-pass filter circuit 4 is connected to the first input end of the high-pass filter circuit 6. The input end of the second low-pass filter circuit 5 is connected to the first end of the second harmonic suppression circuit 3; the output end of the second low-pass filter circuit 5 is connected to the second input end of the high-pass filter circuit 6. The output end of the high-pass filter circuit 6 serves as the signal synthesis output end Output of the lumped in-phase power synthesis circuit. The first low-pass filter circuit 4 is used to filter the signal output from the first end of the input impedance matching circuit 1. The second low-pass filter circuit 5 is used to filter the signal output from the second end of the input impedance matching circuit 1. The high-pass filter circuit 6 is used to synthesize the signals output from the first low-pass filter circuit 4 and the second low-pass filter circuit 5 respectively and output them after filtering. Through the corresponding impedance, filtering and resonance processing, the lumped in-phase power synthesis circuit 100 has impedance transformation characteristics, and has the effects of low cost, high isolation and high integration, and at the same time enables the power amplifier 200 to achieve in-phase power synthesis.

[0035] In this embodiment, the input impedance matching circuit 1 includes a voltage source SRC2, a first inductor L1 and a second inductor L2. The negative electrode of the voltage source SRC2 is grounded, and the positive electrode of the voltage source SRC2 is respectively connected to the first end of the first inductor L1 and the first end of the second inductor L2, and the second end of the first inductor L1 is respectively used as the first end of the input impedance matching circuit 1. The second end of the second inductor L2 is respectively used as the second end of the input impedance matching circuit 1. Specifically, the second end of the first inductor L1 is respectively connected to the first signal input terminal Input1 and the first end of the first harmonic suppression circuit 2. The second end of the second inductor L2 is respectively connected to the second signal input terminal Input2 and the first end of the second harmonic suppression circuit 3. The first inductor L1 and the second inductor L2 both participate in impedance matching, and they also act as choke inductors to achieve isolation between the DC power supply of the voltage source SRC2 and the radio frequency signal. The voltage source SRC2 is used to power the entire circuit, and the first inductor L1 and the second inductor L2 are used to perform impedance matching on the input signal and then output it.

[0036] In this embodiment, the first harmonic suppression circuit 2 includes a first capacitor C1 and a third inductor L3. The first end of the first capacitor C1 serves as the second end of the first harmonic suppression circuit 2 and is grounded, the second end of the first capacitor C1 is connected to the first end of the third inductor L3, and the second end of the third inductor L3 serves as the first end of the first harmonic suppression circuit 2. The first capacitor C1 and the third inductor L3 are used to filter out the second harmonic, and the first capacitor C1 and the third inductor L3 can also perform impedance matching. Thus, the matching signal output by the input impedance matching circuit 1 is subjected to secondary impedance matching, which is used to control the second harmonic impedance value of the amplifier load impedance, and meet the second harmonic impedance requirements of the power amplifier 200.

[0037] Specifically, the second harmonic suppression circuit 3 includes a second capacitor C2 and a fourth inductor L4. The first end of the second capacitor C2 serves as the second end of the second harmonic suppression circuit 3 and is grounded, the second end of the second capacitor C2 is connected to the first end of the fourth inductor L4, and the second end of the fourth inductor L4 serves as the first end of the second harmonic suppression circuit 3. The second capacitor C2 and the fourth inductor L4 are used to filter out the second harmonic, and the second capacitor C2 and the fourth inductor L4 can also perform impedance matching. Thus, the matching signal output by the input impedance matching circuit 1 is subjected to secondary impedance matching, which is used to control the second harmonic impedance value of the amplifier load impedance, and meet the requirements of the power amplifier 200 for the second harmonic impedance.

[0038] In this embodiment, the first low-pass filter circuit 4 includes a fifth inductor L5 and a third capacitor C3. The first end of the fifth inductor L5 serves as the input end of the first low-pass filter circuit 4, the second end of the fifth inductor L5 is connected to the first end of the third capacitor C3 and serves as the output end of the first low-pass filter circuit 4, and the second end of the third capacitor C3 is grounded. The fifth inductor L5 and the third capacitor C3 are connected to remove the high-frequency components in the signal and allow the low-frequency signal to pass. Its working principle is based on the different frequency responses of the fifth inductor L5 and the third capacitor C3 to the signal. By removing the signal above a certain frequency, the low-frequency signal is passed to achieve the effect of low-pass filtering. The connection between the fifth inductor L5 and the third capacitor C3 can also perform impedance transformation on the signal passing through, thereby improving the impedance matching performance of each part of the overall circuit.

[0039] The second low-pass filter circuit 5 includes a sixth inductor L6 and a fourth capacitor C4. The first end of the sixth inductor L6 serves as the input end of the second low-pass filter circuit 5, the second end of the sixth inductor L6 is connected to the first end of the fourth capacitor C4 and serves as the output end of the second low-pass filter circuit 5, and the second end of the fourth capacitor C4 is grounded. The connection between the sixth inductor L6 and the fourth capacitor C4 is to remove the high-frequency component in the signal, allowing the low-frequency signal to pass through, thereby achieving the effect of low-pass filtering. The connection between the sixth inductor L6 and the fourth capacitor C4 can also perform impedance transformation on the signal passing through, thereby improving the impedance matching performance of each part of the overall circuit.

[0040] The second end of the fourth capacitor C4 is connected in series with the eighth inductor L8 and then grounded. The eighth inductor L8 and the fourth capacitor C4 are connected in series to form a second or third harmonic suppression branch, respectively, to further suppress the output harmonics of the power amplifier 200. The eighth inductor L8 and the fourth capacitor C4 are connected to each other to perform impedance transformation on the passing signal.

[0041] In this embodiment, the high-pass filter circuit 6 includes a ninth inductor L9, a fifth capacitor C5 and a sixth capacitor C6. The first end of the fifth capacitor C5 serves as the first input end of the high-pass filter circuit 6, and the first end of the sixth capacitor C6 serves as the second input end of the high-pass filter circuit 6. The second end of the fifth capacitor C5 is respectively connected to the first end of the ninth inductor L9 and the second end of the sixth capacitor C6 and serves as the output end of the high-pass filter circuit 6, and the second end of the ninth inductor L9 is grounded. The high-pass filter branch is formed by the ninth inductor L9, the fifth capacitor C5 and the sixth capacitor C6, and the second harmonic and the third harmonic can be effectively filtered out. The value of the ninth inductor L9 is about one-half smaller than the original two inductors in parallel, so the module integration is further improved. And the capacitor Q value is generally much higher than the inductor Q value. After simplifying the inductor, the loss of the entire power synthesis circuit is reduced. At the same time, through the connection of the ninth inductor L9, the fifth capacitor C5 and the sixth capacitor C6, the impedance transformation of the signal passing through can be performed and output to the signal synthesis output terminal Output.

[0042] Embodiment 2

[0043] like Figure 2 As shown, this embodiment is basically the same as the above-mentioned embodiment 1, except that: the lumped in-phase power synthesis circuit 100 further includes a seventh inductor L7 and an eighth inductor L8. The second end of the third capacitor C3 is connected in series with the seventh inductor L7 and then grounded; the seventh inductor L7 and the third capacitor C3 are connected in series to form a second or third harmonic suppression branch, respectively, to further suppress the output harmonics of the power amplifier 200. At the same time, the seventh inductor L7 is connected to the third capacitor C3 to perform impedance transformation on the signal passing through.

[0044] Embodiment 3

[0045] like Figure 3 As shown, this embodiment is basically the same as the above-mentioned embodiment 1, except that: the lumped in-phase power synthesis circuit 100 also includes a tenth inductor L10; the first end of the tenth inductor L10 is respectively connected to the second end of the third capacitor C3 and the second end of the fourth capacitor C4, and the second end of the tenth inductor L10 is grounded. Since the signal input by the first signal input terminal Input1 and the second signal input terminal Input2 is an in-phase signal, by removing the grounding terminals of the seventh inductor L7 and the eighth inductor L8, the seventh inductor L7 and the eighth inductor L8 are combined to form a single tenth inductor L10, which saves costs. The third capacitor C3 and the fourth capacitor C4 are connected respectively through the tenth inductor L10 for impedance matching; at the same time, the impedance transformation adjustment can be performed on the signal passing through, so that the impedance transformation adjustment of the overall circuit is convenient.

[0046] Embodiment 4

[0047] like Figure 4 As shown, this embodiment is basically the same as the above-mentioned embodiment 1, except that: the lumped in-phase power synthesis circuit 100 also includes a first resistor R1. The first end of the first resistor R1 is connected to the output end of the first low-pass filter circuit 4, and the second end of the first resistor R1 is connected to the output end of the second low-pass filter circuit 5. By adding the first resistor R1 in parallel between the two paths, it is used to absorb the signal leaked between the two paths, thereby achieving higher isolation. Specifically, the first end of the first resistor R1 is connected to the second end of the fifth inductor L5, and the second end of the first resistor R1 is connected to the second end of the sixth inductor L6.

[0048] Embodiment 5

[0049] like Figure 5 As shown, an embodiment of the present invention provides a power amplifier 200, which includes a signal source SRC1, a first amplifier AMP1, a second amplifier AMP2, and a lumped in-phase power synthesis circuit 100 as described in any one of the first to fourth embodiments above.

[0050] The first end of the signal source SRC1 is grounded, and the second end of the signal source SRC1 outputs the RF signal to the input end of the first amplifier AMP1 and the input end of the second amplifier AMP2 respectively. The output end of the first amplifier AMP1 is connected to the first signal input end Input1, and the output end of the second amplifier AMP2 is connected to the second signal input end Input2. By directly connecting the signal source SRC1 to the first amplifier AMP1 and the second amplifier AMP2, compared with differential synthesis and 90° synthesis, the input end of the amplifier does not need to add any power distribution network, thereby simplifying the input end and reducing the chip area and cost. At the same time, the output ends of the first amplifier AMP1 and the second amplifier AMP2 pass through the lumped in-phase power synthesis circuit 100 to achieve power synthesis output.

[0051] It should be noted that the various embodiments described above with reference to the accompanying drawings are only used to illustrate the present invention rather than to limit the scope of the present invention. Those skilled in the art should understand that any modification or equivalent substitution of the present invention without departing from the spirit and scope of the present invention should be included within the scope of the present invention. In addition, unless otherwise indicated by the context, words appearing in the singular include the plural form, and vice versa. In addition, unless otherwise specified, all or part of any embodiment may be used in combination with all or part of any other embodiment.

Claims

1. A lumped in-phase power synthesis circuit, characterized in that: It includes an input impedance matching circuit, a first harmonic suppression circuit, a second harmonic suppression circuit, a first low-pass filter circuit, a second low-pass filter circuit and a high-pass filter circuit; The first end of the input impedance matching circuit serves as the first signal input end of the lumped in-phase power synthesis circuit, and the second end of the input impedance matching circuit serves as the second signal input end of the lumped in-phase power synthesis circuit; the first end of the first harmonic suppression circuit is connected to the first end of the input impedance matching circuit; the second end of the first harmonic suppression circuit is grounded, the first end of the second harmonic suppression circuit is connected to the second end of the input impedance matching circuit, and the second end of the second harmonic suppression circuit is grounded; the input impedance matching circuit is used to provide power supply and impedance matching; the first harmonic suppression circuit is used to filter out the second harmonic of the signal output from the first end of the input impedance matching circuit; the second harmonic suppression circuit is used to filter out the second harmonic of the signal output from the second end of the input impedance matching circuit; The input end of the first low-pass filter circuit is connected to the first end of the first harmonic suppression circuit, and the output end of the first low-pass filter circuit is connected to the first input end of the high-pass filter circuit; the input end of the second low-pass filter circuit is connected to the first end of the second harmonic suppression circuit, and the output end of the second low-pass filter circuit is connected to the second input end of the high-pass filter circuit, and the output end of the high-pass filter circuit serves as the signal synthesis output end of the lumped in-phase power synthesis circuit; the first low-pass filter circuit is used to filter the signal output from the first end of the input impedance matching circuit; the second low-pass filter circuit is used to filter the signal output from the second end of the input impedance matching circuit; the high-pass filter circuit is used to synthesize the signals respectively output from the first low-pass filter circuit and the second low-pass filter circuit and output them after filtering; The input impedance matching circuit includes a voltage source, a first inductor and a second inductor; the negative electrode of the voltage source is grounded, the positive electrode of the voltage source is respectively connected to the first end of the first inductor and the first end of the second inductor, the second end of the first inductor serves as the first end of the input impedance matching circuit; the second end of the second inductor serves as the second end of the input impedance matching circuit.

2. The lumped in-phase power synthesis circuit according to claim 1, characterized in that: The first harmonic suppression circuit includes a first capacitor and a third inductor; the first end of the first capacitor serves as the second end of the first harmonic suppression circuit, the second end of the first capacitor is connected to the first end of the third inductor, and the second end of the third inductor serves as the first end of the first harmonic suppression circuit; The second harmonic suppression circuit includes a second capacitor and a fourth inductor; the first end of the second capacitor serves as the second end of the second harmonic suppression circuit, the second end of the second capacitor is connected to the first end of the fourth inductor, and the second end of the fourth inductor serves as the first end of the second harmonic suppression circuit.

3. The lumped in-phase power synthesis circuit according to claim 2, characterized in that: The first low-pass filter circuit includes a fifth inductor and a third capacitor; the first end of the fifth inductor serves as an input end of the first low-pass filter circuit, the second end of the fifth inductor is connected to the first end of the third capacitor and serves as an output end of the first low-pass filter circuit, and the second end of the third capacitor is grounded; The second low-pass filter circuit includes a sixth inductor and a fourth capacitor; the first end of the sixth inductor serves as the input end of the second low-pass filter circuit, the second end of the sixth inductor is connected to the first end of the fourth capacitor and serves as the output end of the second low-pass filter circuit, and the second end of the fourth capacitor is grounded.

4. The lumped in-phase power synthesis circuit according to claim 3, characterized in that: The lumped in-phase power synthesis circuit also includes a seventh inductor and an eighth inductor; the second end of the third capacitor is connected in series with the seventh inductor and then grounded, and the second end of the fourth capacitor is connected in series with the eighth inductor and then grounded.

5. The lumped in-phase power synthesis circuit according to claim 3, characterized in that: The high-pass filter circuit includes a ninth inductor, a fifth capacitor and a sixth capacitor; the first end of the fifth capacitor serves as the first input end of the high-pass filter circuit, the first end of the sixth capacitor serves as the second input end of the high-pass filter circuit, the second end of the fifth capacitor is respectively connected to the first end of the ninth inductor and the second end of the sixth capacitor and serves as the output end of the high-pass filter circuit, and the second end of the ninth inductor is grounded.

6. The lumped in-phase power synthesis circuit according to claim 3, characterized in that: The lumped in-phase power synthesis circuit further includes a tenth inductor; a first end of the tenth inductor is respectively connected to the second end of the third capacitor and the second end of the fourth capacitor, and a second end of the tenth inductor is grounded.

7. According to the lumped in-phase power synthesis circuit of claim 1, the lumped in-phase power synthesis circuit also includes a first resistor; the first end of the first resistor is connected to the output end of the first low-pass filter circuit, and the second end of the first resistor is connected to the output end of the second low-pass filter circuit.

8. A power amplifier, characterized in that: The power amplifier comprises a signal source, a first amplifier, a second amplifier and a lumped in-phase power synthesis circuit as claimed in any one of claims 1 to 7; The first end of the signal source is grounded, and the second end of the signal source outputs a radio frequency signal to the input end of the first amplifier and the input end of the second amplifier respectively. The output end of the first amplifier is connected to the first signal input end, and the output end of the second amplifier is connected to the second signal input end.

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