Multiband matching circuit, radio frequency front end module, chip and electronic device

Abstract

The utility model provides a kind of multi-band matching circuit, radio frequency front end module, chip and electronic equipment.Multi-band matching circuit includes the first output load line with the first inductor and the first matching sub-network of series connection and the second output load line with the second inductor and the second matching sub-network of series connection, the input port of first output load line and second output load line respectively receives signal different in operating frequency band, the output port of first output load line and second output load line is respectively coupled the input port of two different frequency bands of antenna switch;First inductor and second inductor exist the coupling relationship of negative coupling coefficient.The utility model can significantly improve the isolation of output matching network, significantly reduce energy leakage;Further, the utility model does not change the composition of matching circuit element, without increasing any hardware cost;And will not increase the layout area of radio frequency front end module.

Description

Technical Field

[0001] This utility model relates to the field of power amplifier technology, and in particular to a multi-band matching circuit, radio frequency front-end module, chip and electronic equipment. Background Technology

[0002] A multi-mode, multi-band (MMMB) power amplifier is a high-performance wireless communication electronic component that supports multiple wireless communication standards and frequency bands, such as 4G / 5G LTE, WiFi (2.4GHz / 5GHz), and Bluetooth. Its main function is to efficiently switch and operate between different frequency bands, providing wide spectrum coverage. It is suitable for devices such as smartphones, wireless routers, and mobile base stations. Taking mobile terminals as an example, according to the 3GPP protocol, several commonly used communication frequency bands are shown in Table 1 below:

[0003] Table 1: Some Common Communication Frequency Bands

[0004] Due to the need for miniaturization, current products on the market typically integrate power amplifiers (PAs) of different frequency bands onto the same substrate to form an MMMB (Multi-Mechanical Module). (See [link to relevant documentation]). Figure 1 , Figure 1 This is a schematic diagram of the output topology of a multimode multi-frequency power amplifier. (See diagram below.) Figure 1 As shown, the MB output load line (MB_Loadline) of the intermediate frequency (IF) power amplifier MB_PA is connected to the IF input port MB_IN of the antenna switch 150 (ASW), and the HB output load line of the high-frequency (HF) power amplifier HB_PA is connected to the HF input port HB_IN of the antenna switch 150. The antenna switch 150 has multiple output ports MB1, MB2, ..., MBn and HB1, HB2, ..., HBm for the IF and HF bands respectively, for more specific frequency band applications. When the IF power amplifier MB_PA is working, the high-frequency power amplifier HB_PA is not working, and vice versa. For example, in MMMB products using wire bonding (WB) packaging technology, power amplifiers of different frequency bands share the same antenna switch, and therefore their output load lines will couple due to their close proximity; similarly, for flip-chip packages, coupling will also occur when different PA output traces are close together. For example, when the intermediate frequency power amplifier MB_PA is working, a signal may enter the output load line of the high frequency power amplifier HB_PA, causing interference to its receiver. Conversely, when the high frequency power amplifier HB_PA is working, a signal may enter the output load line of the intermediate frequency power amplifier MB_PA, causing interference to its receiver.

[0005] It should be noted that the information disclosed in the background section of this utility model is intended only to enhance the understanding of the general background of this utility model, and should not be regarded as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] This invention addresses one or more problems in the prior art by providing a multi-band matching circuit, an RF front-end module, a chip, and electronic equipment. This invention can significantly improve the isolation of the output matching network and significantly reduce energy leakage. Furthermore, this invention does not change the composition of the matching circuit components, does not increase any hardware costs, and does not increase the layout area of ​​the RF front-end module.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a multi-band matching circuit, comprising a first output load line and a second output load line. The first output load line includes a first inductor and a first matching sub-network connected in series. The second output load line includes a second inductor and a second matching sub-network connected in series. The input ports of the first and second output load lines are respectively used to receive output signals from a first power amplifier and a second power amplifier operating at different frequency bands. The output ports of the first and second output load lines are respectively used to couple to the input ports of two different frequency bands of an antenna switch. The first inductor and the second inductor have a negative coupling coefficient to reduce energy leakage of the output signal caused by coupling between the first and second output load lines.

[0008] Optionally, the first inductor and the second inductor have a negative coupling coefficient coupling relationship, including: the coils of the first inductor and the coils of the second inductor have the same winding direction, and are close to each other in the layout without overlapping.

[0009] Optionally, the absolute value of the coupling coefficient between the first inductor and the second inductor is less than a preset value.

[0010] Optionally, the first matching sub-network includes a first RC circuit and a first coupling line, and the second matching sub-network includes a second RC circuit and a second coupling line, wherein the first coupling line and the second coupling line are coupled; the first terminal of the first RC circuit receives the output signal of the first power amplifier, the second terminal of the first RC circuit is coupled to the first terminal of the first inductor, the second terminal of the first inductor is coupled to the first terminal of the first coupling line, and the second terminal of the first coupling line is used to couple to the first input port of the antenna switch; the first terminal of the second RC circuit receives the output signal of the second power amplifier, the second terminal of the second RC circuit is coupled to the first terminal of the second inductor, the second terminal of the second inductor is coupled to the first terminal of the second coupling line, and the second terminal of the second coupling line is used to couple to the second input port of the antenna switch.

[0011] Optionally, when the first power amplifier is operating, the first induced current generated by the first inductor in the second inductor is in the opposite direction to the first coupling current coupled from the first coupling line to the second coupling line; when the second power amplifier is operating, the second induced current generated by the second inductor in the first inductor is in the opposite direction to the second coupling current coupled from the second coupling line to the first coupling line.

[0012] Optionally, the coupling coefficients of the first inductor and the second inductor are related to the coupling coefficients between the first coupling line and the second coupling line, such that the absolute value of the difference between the first induced current and the first coupling current, and the absolute value of the difference between the second induced current and the second coupling current, are less than a preset error threshold.

[0013] To achieve the above objectives, this utility model also provides a radio frequency front-end module, which includes a first power amplifier and a second power amplifier with different operating frequency bands, an antenna switch, and a multi-band matching circuit as described above; the two input terminals of the multi-band matching circuit are respectively coupled to the first power amplifier and the second power amplifier, and the two output terminals of the multi-band matching circuit are respectively coupled to the two input ports of the antenna switch with different frequency bands.

[0014] Optionally, the first power amplifier and the second power amplifier do not operate simultaneously.

[0015] To achieve the above objectives, the present invention also provides a chip, characterized in that it integrates the multi-band matching circuit described in any one of the above claims or the radio frequency front-end module described in any one of the above claims.

[0016] To achieve the above objectives, the present invention also provides an electronic device, which includes the multi-band matching circuit described in any of the above claims, or the radio frequency front-end module described in any of the above claims, or the chip described in the above claims.

[0017] Compared with the prior art, the multi-band matching circuit, RF front-end module, chip and electronic equipment provided by this utility model have the following advantages:

[0018] The multi-band matching circuit provided by this utility model adopts a design method in which the coupling relationship between the first inductor and the second inductor is designed with a negative coupling coefficient. This fully utilizes the unavoidable coupling relationship between the first output load line and the second output load line, which can effectively reduce the energy leakage of the output signal caused by the coupling between the first output load line and the second output load line, thereby significantly improving the isolation between the first output load line and the second output load line. Furthermore, this utility model does not change the composition of the matching circuit components, does not increase any hardware costs, and does not increase the layout area of ​​the RF front-end module.

[0019] Furthermore, since the RF front-end module, chip, and electronic device provided by this utility model belong to the same inventive concept as the multi-band matching circuit provided by this utility model, the RF front-end module, chip, and electronic device provided by this utility model at least have all the advantages of the multi-band matching circuit provided by this utility model. For details on the beneficial effects of the RF front-end module, chip, and electronic device provided by this utility model, please refer to the above description of the beneficial effects of the multi-band matching circuit provided by this utility model, which will not be repeated here. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the output topology of a multimode multifrequency power amplifier.

[0021] Figure 2 This is a schematic diagram of the output network of two power amplifiers operating in different frequency bands in the prior art.

[0022] Figure 3 In order to be in Figure 2 Based on this, a schematic diagram of the coupling effect of the inductor is marked.

[0023] Figure 4 A schematic diagram illustrating the variation of leakage energy with coupling coefficient K1 in the prior art is given.

[0024] Figure 5 This is a schematic diagram of the structure of the multi-band matching circuit provided in Embodiment 1 of this utility model.

[0025] Figure 6This is a schematic diagram of the layout of the coil of the first inductor and the second inductor coil in a specific example of the multi-band matching circuit provided in Embodiment 1 of this utility model.

[0026] Figure 7 This is a schematic diagram showing the variation of energy leakage with coupling coefficient K1 in a specific example of the multi-band matching circuit provided in Embodiment 1 of this utility model.

[0027] Figure 8 This is a schematic diagram of the topology of a specific example of the multi-band matching circuit provided in Embodiment 1 of this utility model.

[0028] Figure 9 This is a schematic diagram showing the variation of energy leakage with coupling coefficient K1 between the multi-band matching circuit provided in Embodiment 1 of this utility model and the load output line in the prior art.

[0029] Figure 10 This is a structural block diagram of the radio frequency front-end module provided in Embodiment 2 of this utility model. Detailed Implementation

[0030] The following detailed description, in conjunction with the accompanying drawings, provides a further detailed explanation of the multi-band matching circuit, RF front-end module, chip, and electronic device proposed in this utility model. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, intended only to facilitate and clearly illustrate the embodiments of this utility model. Please refer to the drawings to make the objectives, features, and advantages of this utility model more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for illustrative purposes and to enable those skilled in the art to understand and read them, and are not intended to limit the implementation conditions of this utility model. Any modifications to the structure, changes in proportions, or adjustments to the size, provided they produce the same or similar effects and achieve the same objectives as this utility model, should still fall within the scope of the technical content disclosed in this utility model. Specific design features of this utility model disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the specific application and usage environment. Furthermore, in the embodiments described below, the same reference numerals are sometimes used across different figures to denote the same parts or parts having the same function, and their repeated descriptions are omitted. In this specification, similar reference numerals and letters are used to denote similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0031] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The singular forms “a,” “an,” and “the” include plural objects. The term “or” is generally used to mean “and / or,” the term “several” is generally used to mean “at least one,” and the term “at least two” is generally used to mean “two or more.” Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0032] It should be understood that when a component is referred to as "connected," "connected to," or "coupled to" other components, it may be directly connected to other components, or there may be intermediary components. Conversely, when a component is referred to as "directly connected" or "directly connected to" other components, there are no intermediary components.

[0033] To facilitate understanding of this utility model, before describing the specific embodiments of the multi-band matching circuit, RF front-end module, chip, and electronic equipment provided by this utility model, the main research process for proposing this utility model is briefly described as follows:

[0034] Please see Figure 2 , Figure 2 This is a schematic diagram of the output network of two power amplifiers operating in different frequency bands, as described in the prior art. Figure 2 It can be seen that when two power amplifiers ( Figure 2(Not shown, but schematically illustrated using input ports 111 and 112) When the output load lines 130 and 140 are not coupled, taking the signal from input port 112 through output load line 140 to output port 122 and then through antenna switch 150 to the load of the corresponding power amplifier as an example, there is no energy (power) leakage during the signal transmission through output load line 140. However, although theoretically the energy entering from input port 112 will not leak to output port 121, coupling is unavoidable in actual circuits. First, the inductors Lo2 and Lo2' of the output load lines 130 and 140 of the two power amplifiers are weakly coupled; second, their respective coupling lines TL1 and TL1' (output coupling networks) are also coupled. Therefore, energy leakage will occur during the energy transmission from input port 112 to output port 122.

[0035] Please see Figure 3 , Figure 3 In order to be in Figure 2 Based on this, a schematic diagram of the coupling effect of the inductor is marked. Figure 3 In the above, the coupling coefficient K1 between inductors Lo2 and Lo2' has a range of -1≤K1≤1. The larger the absolute value of the coupling coefficient K1, the stronger the coupling effect. Figure 3 The coupling effect between output load lines 130 and 140 is illustrated using coupled lines TL1 and TL1' (output coupling network), and the coupling coefficient is denoted as K2. Taking the example of energy output from input port 112 to output port 122, since the energy output from input port 112 to output port 122 will leak to output port 121, with a fixed coupling coefficient K2, the larger the coupling coefficient K1, the more energy is leaked. For an example, please refer to [link to example]. Figure 4 , Figure 4 A schematic diagram illustrating the variation of leaked energy with coupling coefficient K1 in the prior art is given, wherein, Figure 4 The values ​​in the table are the data after normalizing the energy by assuming K1=0 (i.e., K1=0 represents no coupling). From Figure 4 It can be seen that as the coupling effect strengthens (i.e., the coupling coefficient K1 increases), the leaked energy shows an upward trend.

[0036] In existing technologies, the method of minimizing the coupling coefficient K1 is often used to reduce energy leakage. However, due to the limitations of layout area and antenna switch design, the coupling coefficient K1 cannot be reduced indefinitely. In practical applications, reducing the coupling coefficient often leads to an increase in layout area.

[0037] To address the aforementioned issues, the core idea of ​​this invention is to provide a multi-band matching circuit, an RF front-end module, a chip, and electronic equipment. By utilizing the unavoidable coupling relationship between output load lines (output coupling networks), this invention can significantly improve the isolation of the output matching network and significantly reduce energy leakage. Furthermore, this invention does not change the composition of the matching circuit components, does not increase any hardware costs, and does not increase the layout area of ​​the RF front-end module.

[0038] It should be noted that the multi-band matching circuit provided by this utility model can be used in the RF front-end module and electronic device provided by this utility model. The multi-band matching circuit, RF front-end module, and chip provided by this utility model can be used in the electronic device provided by this utility model. It should also be noted that the electronic device provided by this utility model includes, but is not limited to, electronic devices that can be used in mobile environments and support one or more communication standards, including but not limited to GSM, EDGE, TD-SCDMA, TDD-LTE, and FDD-LTE. For example, the electronic devices described herein include, but are not limited to, mobile phones, laptops, tablets, and in-vehicle computers. Furthermore, the multi-band matching circuit provided by this utility model is also applicable to other RF integrated circuit applications, such as communication base stations.

[0039] Example 1

[0040] This embodiment provides a multi-band matching circuit. For an example, please refer to [link to example circuit]. Figure 5 , Figure 5 This is a schematic diagram of the multi-band matching circuit provided in this embodiment. Figure 5 As shown, the multi-band matching circuit provided in this embodiment includes a first output load line 210 and a second output load line 220. The first output load line 210 includes a first inductor 211 and a first matching sub-network 212 connected in series. The second output load line 220 includes a second inductor 221 and a second matching sub-network 222 connected in series. The input port 111 of the first output load line 210 and the input port 112 of the second output load line 220 are respectively used to receive signals from first power amplifiers with different operating frequency bands. Figure 5 (not shown in the image) and second power amplifier ( Figure 5 The output signal (not shown in the image) is used to couple the output port 121 of the first output load line 210 and the output port 122 of the second output load line 220 to the input ports of the antenna switch 150 at two different frequency bands. Figure 5(Not shown in the diagram, output ports 121 and 122 are used for illustration); the first inductor 211 and the second inductor 221 have a negative coupling coefficient to reduce the energy leakage of the output signal caused by the coupling between the first output load line 210 and the second output load line 220.

[0041] Therefore, the multi-band matching circuit provided by this utility model adopts a design method that sets the coupling relationship between the first inductor 211 and the second inductor 221 as a negative coupling coefficient. This fully utilizes the unavoidable coupling relationship between the first output load line 210 and the second output load line 220, effectively reducing the energy leakage of the output signal caused by the coupling between the first output load line 210 and the second output load line 220, thereby significantly improving the isolation between the first output load line 210 and the second output load line 220. Furthermore, this utility model does not change the composition of the matching circuit components, does not increase any hardware costs, and does not increase the layout area of ​​the RF front-end module.

[0042] It should be noted that the present invention does not limit the frequency band of the signals output by the first power amplifier and the second power amplifier. For example, in some exemplary embodiments, the first power amplifier may output an intermediate frequency signal and the second power amplifier may output a high frequency signal.

[0043] For example, please see Figure 6 , Figure 6 The diagram shows the layout of the coils of the first inductor and the second inductor in a specific example of the multi-band matching circuit provided in this embodiment. Figure 6 As shown, the first inductor 211 and the second inductor 221 have a negative coupling coefficient, meaning that the coils of the first inductor 211 and the second inductor 221 have the same winding direction and are close to each other without overlapping in the layout. Therefore, this invention, by employing a design where the coils of the first inductor 211 and the second inductor 221 have the same winding direction and are close to each other without overlapping in the layout, can improve isolation without changing the composition of the matching circuit components, effectively avoiding the problem in the prior art where increasing the layout area is necessary to reduce coupling.

[0044] It should be noted that those skilled in the art should understand that although the coupling relationship between the first inductor 211 and the second inductor 221 with a negative coupling coefficient is achieved by the design method in which the coils of the first inductor 211 and the second inductor 221 have the same winding direction and are close to each other in the layout without overlapping, it is obviously not a limitation of this utility model. In other embodiments, the technical effect of reverse winding direction can also be achieved by using methods including but not limited to the method of the coils of the first inductor 211 and the second inductor 221 having the same winding direction but one of the first inductor 211 and the second inductor 221 being reversed.

[0045] For example, please see Figure 7 , Figure 7 This is a schematic diagram illustrating the variation of energy leakage with coupling coefficient K1 in a specific example of the multi-band matching circuit provided in this embodiment. Figure 7 As shown, with the increase of the coupling coefficient K1, there exists an optimal coupling coefficient K1 that minimizes energy leakage, for example... Figure 7 In the example shown, energy leakage is minimized when K1 = 0.25 dB. Understandably, this invention does not limit the specific value of the negative coupling coefficient between the first inductor 211 and the second inductor 221. Preferably, the absolute value of the coupling coefficient between the first inductor 211 and the second inductor 221 is less than a preset value. For example, in some exemplary embodiments, the preset value may be 0.025; in other exemplary embodiments, the preset value may be 0.3; the specific value should be determined based on the device parameters and design objectives of the multi-band matching circuit.

[0046] For example, please see Figure 8 , Figure 8 This is a schematic diagram of the topology of one specific example of the multi-band matching circuit provided in this embodiment. For example... Figure 8 As shown, in some exemplary embodiments, the first matching sub-network 212 includes a first RC circuit 2121 and a first coupling line 2122, and the second matching sub-network 222 includes a second RC circuit 2221 and a second coupling line 2222. The first coupling line 2122 and the second coupling line 2222 are coupled. The first terminal of the first RC circuit 2121 receives the output signal of the first power amplifier, the second terminal of the first RC circuit 2121 is coupled to the first terminal of the first inductor 211, the second terminal of the first inductor 211 is coupled to the first terminal of the first coupling line 2122, and the second terminal of the first coupling line 2122 is used to couple to the first input port of the antenna switch 150. Figure 5(Not shown, using output port 121 for illustration) The first terminal of the second RC circuit 2221 receives the output signal of the second power amplifier. The second terminal of the second RC circuit 2221 is coupled to the first terminal of the second inductor 221. The second terminal of the second inductor 221 is coupled to the first terminal of the second coupling line 2222. The second terminal of the second coupling line 2222 is used to couple to the second input port of the antenna switch 150. Figure 5 (Not specified in the diagram; use output port 122 for illustration).

[0047] It should be noted that those skilled in the art should understand that the design of the first matching sub-network 212 using the first RC circuit 2121 and the first coupling line 2122, and the second matching sub-network 222 using the second RC circuit 2221 and the second coupling line 2222, are merely illustrative examples of preferred embodiments and not limitations of this invention. This invention does not limit the specific implementation of the first matching sub-network 212 and the second matching sub-network 222, as long as impedance matching between the power amplifier and the corresponding load can be achieved. For related content on matching networks, please refer to the relevant technical adaptations known to those skilled in the art; due to space limitations, this article will not elaborate further.

[0048] For example, please continue to see Figure 8 ,like Figure 8As shown, in some exemplary embodiments, the first RC circuit 2121 employs a load matching network design for a single-ended Class F power amplifier. The first RC circuit 2121 includes a third inductor Chok_L1, a fourth inductor Trap_L1, a fifth inductor Lo1, a sixth inductor Trap_L2, a first capacitor Trap_C1, a second capacitor Co1, and a third capacitor Co2. The first terminal of the third inductor Chok_L1 is grounded, and the second terminal of the third inductor Chok_L1, the first terminal of the first capacitor Trap_C1, and the first terminal of the second capacitor Co1 are coupled together. The second terminal of the first capacitor Trap_C1... The first terminal of the fourth inductor Trap_L1 is coupled to the ground. The second terminal of the fourth inductor Trap_L1 is grounded. The second terminal of the second capacitor Co1, the first terminal of the fifth inductor Lo1, and the same-name terminal of the first inductor 211 are coupled to the ground. The opposite-name terminal of the first inductor 211, the first terminal of the third capacitor Co2, and the first terminal of the first coupling line 2122 are coupled to the ground. The second terminal of the third capacitor Co2 is coupled to the first terminal of the sixth inductor Trap_L2. The second terminal of the sixth inductor Trap_L2 is grounded. The second terminal of the first coupling line 2122 is coupled to the first input port of the antenna switch 150. Therefore, by using inductors and capacitors to implement the first RC circuit 2121, the impedance between the power amplifier and the load can be effectively adjusted, reducing power loss and signal distortion caused by impedance mismatch, achieving maximum power transmission and minimum signal reflection loss.

[0049] Since the second RC circuit 2221 has the same topology as the first RC circuit 2121, for more detailed information about the second RC circuit 2221, please refer to the above-mentioned description of the first RC circuit 2121 for an adaptive understanding. It will not be elaborated here.

[0050] For example, when the first power amplifier is operating, the first induced current induced by the first inductor 211 in the second inductor 221 is in the opposite direction to the first coupling current coupled from the first coupling line 2122 to the second coupling line 2222; when the second power amplifier is operating, the second induced current induced by the second inductor 221 in the first inductor 211 is in the opposite direction to the second coupling current coupled from the second coupling line 2222 to the first coupling line 2122.

[0051] Please continue reading Figure 8Taking the transmission of a signal from input port 111 through the first output load line 210 to output port 121 as an example, the working principle of the multi-band matching circuit provided by this utility model is briefly explained:

[0052] When a signal is transmitted from input port 111 to output port 121 via first output load line 210, a non-uniformly changing current I1 in the first inductor 211 generates a changing magnetic field outside the coil of the first inductor 211. This magnetic field induces a first induced current I2 in the coil of the second inductor 221. Since the coils of the first inductor 211 and the second inductor 221 have the same but non-overlapping winding direction, the direction of the first induced current I2 in the second inductor 221 is opposite to the direction of the current I1 in the first inductor 211. Since the current I1 in the first inductor 211 is coupled to the first coupling current I3 in the second output load line 22 via the first coupling line 2122 through the output coupling network, the first coupling current I3 is in the same direction. Therefore, two oppositely oriented first induced currents I2 and I3 will be generated on the coil of the second inductor 221. By controlling the coupling coefficient between the first inductor 211 and the second inductor 221, the magnitude of the first induced current I2 can be controlled, thereby making the first induced current I2 and the first coupling current I3 the same magnitude, canceling each other out and reducing the magnitude of the output signal coupled from the first inductor 211 to the second output load line 220 where the second inductor 221 is located. Please refer to... Figure 9 , Figure 9 This is a schematic diagram showing how the energy leakage of the multi-band matching circuit provided in this embodiment varies with the coupling coefficient K1 compared to the load output line in the prior art. Figure 9 In the diagram, the dashed line represents the variation of leaked energy with the coupling coefficient K1 in the prior art; the solid line represents the variation of leaked energy with the coupling coefficient K1 using the present invention. Figure 9 It can be seen that, from Figure 9 It can be seen that this invention can significantly improve isolation and reduce energy leakage.

[0053] For example, in some exemplary embodiments, the coupling coefficients of the first inductor 211 and the second inductor 221 are coupled to the coupling coefficients between the first coupling line 2122 and the second coupling line 2222, such that the absolute value of the difference between the first induced current and the first coupled current, and the absolute value of the difference between the second induced current and the second coupled current, are less than a preset error threshold.

[0054] Understandably, this invention does not impose excessive limitations on the specific value of the preset error threshold. Preferably, the smaller the preset error threshold, the less energy leakage and the better the isolation effect. Please continue to see... Figure 9 ,like Figure 9 As shown, in this example, the isolation effect is optimal when the coupling coefficient between the first inductor 211 and the second inductor 221 is 0.25dB.

[0055] Example 2

[0056] This embodiment provides a radio frequency front-end module. For example, please refer to [link to example]. Figure 10 , Figure 10 This is a structural block diagram of the radio frequency front-end module provided in this embodiment. Figure 10 As can be seen, the RF front-end module includes a first power amplifier PA1 and a second power amplifier PA2 with different operating frequency bands, an antenna switch 150, and a multi-band matching circuit 200 as described in any embodiment of this document; the two input terminals of the multi-band matching circuit 200 are respectively coupled to the first power amplifier PA1 and the second power amplifier PA2, and the two output terminals of the multi-band matching circuit 200 are respectively coupled to the two input ports of the antenna switch 150 with different frequency bands.

[0057] Since the RF front-end module provided by this utility model and the multi-band matching circuit provided by this utility model belong to the same utility model concept, the RF front-end module provided by this utility model has at least all the advantages of the multi-band matching circuit provided by this utility model. For details on the beneficial effects of the RF front-end module provided by this utility model, please refer to the above description of the beneficial effects of the multi-band matching circuit provided by this utility model. It will not be repeated here.

[0058] Due to space limitations, for other content of the RF front-end module not mentioned in this article, please refer to the relevant technical adaptations known to those skilled in the art; this article will not elaborate on them.

[0059] For example, the first power amplifier PA1 and the second power amplifier PA2 do not operate simultaneously. This allows for better reduction of signal crosstalk.

[0060] It should be understood that the fact that the first power amplifier PA1 and the second power amplifier PA2 do not work simultaneously is merely an illustrative example of a preferred embodiment and not a limitation. This invention is still applicable to two coupled circuits that work simultaneously, and to the case where the first power amplifier PA1 and the second power amplifier PA2 work simultaneously.

[0061] Example 3

[0062] This embodiment provides a chip. In some embodiments, the chip integrates the multi-band matching circuit described in any embodiment of Embodiment 1 of this document; in other embodiments, the chip integrates the radio frequency front-end module described in Embodiment 2 of this document.

[0063] Example 4

[0064] This embodiment provides an electronic device. In some embodiments, the electronic device includes the multi-band matching circuit described in any embodiment of Embodiment 1 of this document; in other embodiments, the electronic device includes the radio frequency front-end module described in any embodiment of Embodiment 2 of this document; and in still other embodiments, the electronic device includes the chip described in Embodiment 3 of this document.

[0065] More specifically, the electronic device provided in this embodiment, in addition to a processor and memory for implementing basic functions such as communication, may further include display components, communication components, sensor components, power supply components, multimedia components, and input / output interfaces, depending on actual needs. The display components, memory, communication components, sensor components, power supply components, multimedia components, and input / output interfaces are all connected to the processor. The memory may be static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, etc. The processor may be a central processing unit (CPU), graphics processing unit (GPU), field-programmable gate array (FPGA), application-specific integrated circuit (ASIC), digital signal processing (DSP) chip, etc. Other communication components, sensor components, power supply components, multimedia components, etc., can be implemented using general-purpose components; due to space limitations, they will not be described in detail here. For more detailed information, please refer to the relevant technical adaptation understanding known to those skilled in the art.

[0066] It should be noted that the functional modules in the various embodiments of this article can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0067] Compared with the prior art, the multi-band matching circuit, RF front-end module, chip and electronic equipment provided by this utility model have the following advantages:

[0068] The multi-band matching circuit provided by this utility model adopts a design method in which the coupling relationship between the first inductor and the second inductor is designed with a negative coupling coefficient. This fully utilizes the unavoidable coupling relationship between the first output load line and the second output load line, which can effectively reduce the energy leakage of the output signal caused by the coupling between the first output load line and the second output load line, thereby significantly improving the isolation between the first output load line and the second output load line. Furthermore, this utility model does not change the composition of the matching circuit components, does not increase any hardware costs, and does not increase the layout area of ​​the RF front-end module.

[0069] The above description is merely a description of preferred embodiments of the multi-band matching circuit, RF front-end module, chip, and electronic equipment provided by this utility model, and is not intended to limit the scope of this utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of this utility model. Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A multi-band matching circuit, characterized in that, The multi-band matching circuit includes a first output load line and a second output load line. The first output load line includes a first inductor and a first matching sub-network connected in series. The second output load line includes a second inductor and a second matching sub-network connected in series. The input ports of the first and second output load lines are respectively used to receive the output signals of a first power amplifier and a second power amplifier with different operating frequency bands. The output ports of the first and second output load lines are respectively used to couple the input ports of two different frequency bands of an antenna switch. The first inductor and the second inductor have a negative coupling coefficient to reduce the energy leakage of the output signal caused by the coupling between the first and second output load lines.

2. The multi-band matching circuit according to claim 1, characterized in that, The first inductor and the second inductor have a negative coupling coefficient coupling relationship, including: the coils of the first inductor and the coils of the second inductor have the same winding direction, and are close to each other in the layout without overlapping.

3. The multi-band matching circuit according to claim 1, characterized in that, The absolute value of the coupling coefficient between the first inductor and the second inductor is less than a preset value.

4. The multi-band matching circuit according to claim 1, characterized in that, The first matching sub-network includes a first RC circuit and a first coupling line, and the second matching sub-network includes a second RC circuit and a second coupling line. The first coupling line and the second coupling line are coupled. The first terminal of the first RC circuit receives the output signal of the first power amplifier, the second terminal of the first RC circuit is coupled to the first terminal of the first inductor, the second terminal of the first inductor is coupled to the first terminal of the first coupling line, and the second terminal of the first coupling line is used to couple to the first input port of the antenna switch. The first terminal of the second RC circuit receives the output signal of the second power amplifier, the second terminal of the second RC circuit is coupled to the first terminal of the second inductor, the second terminal of the second inductor is coupled to the first terminal of the second coupling line, and the second terminal of the second coupling line is used to couple to the second input port of the antenna switch.

5. The multi-band matching circuit according to claim 4, characterized in that, When the first power amplifier is working, the first induced current generated by the first inductor in the second inductor is in the opposite direction to the first coupling current coupled from the first coupling line to the second coupling line; when the second power amplifier is working, the second induced current generated by the second inductor in the first inductor is in the opposite direction to the second coupling current coupled from the second coupling line to the first coupling line.

6. The multi-band matching circuit according to claim 5, characterized in that, The coupling coefficients of the first inductor and the second inductor are related to the coupling coefficients between the first coupling line and the second coupling line, such that the absolute value of the difference between the first induced current and the first coupling current, and the absolute value of the difference between the second induced current and the second coupling current, are less than a preset error threshold.

7. A radio frequency front-end module, characterized in that, The device includes a first power amplifier and a second power amplifier with different operating frequency bands, an antenna switch, and a multi-band matching circuit as described in any one of claims 1 to 6; the two input terminals of the multi-band matching circuit are respectively coupled to the first power amplifier and the second power amplifier, and the two output terminals of the multi-band matching circuit are respectively coupled to the two input ports of the antenna switch at different frequency bands.

8. The radio frequency front-end module according to claim 7, characterized in that, The first power amplifier and the second power amplifier do not operate simultaneously.

9. A chip, characterized in that, It integrates a multi-band matching circuit as described in any one of claims 1 to 6 or a radio frequency front-end module as described in any one of claims 7 to 8.

10. An electronic device, characterized in that, It includes the multi-band matching circuit as described in any one of claims 1 to 6, or the radio frequency front-end module as described in any one of claims 7 to 8, or the chip as described in claim 9.

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