Radio frequency receiving circuit and radio frequency front end module

Abstract

This application relates to the field of radio frequency (RF) technology, and more particularly to an RF receiving circuit and an RF front-end module. In the RF receiving circuit and RF front-end module provided in the embodiments of this application, a switching unit includes a first port, a second port, and a first switch connected between the first port and the second port. The first port is used to output RF signals of a first frequency band and / or RF signals of a second frequency band, and the second port is connected to a suppression unit. The first switch is configured to, when the switching unit outputs RF signals of the first frequency band, control the first switch to a first state to access the suppression unit. The suppression unit is used to suppress RF signals of a target frequency band. Through the above method, when receiving RF signals of the first frequency band, accessing the suppression unit to suppress RF signals of the target frequency band reduces interference from RF signals of the target frequency band to RF signals of the first frequency band, thereby improving the reception quality of RF signals of the first frequency band.

Description

Technical Field

[0001] This application relates to the field of radio frequency technology, and in particular to a radio frequency receiving circuit and a radio frequency front-end module. Background Technology

[0002] In the RF front-end module, a single receiving link is used to receive and process signals from the first and second frequency bands, which are similar in frequency. If the communication device connected to this receiving link is simultaneously transmitting RF signals from the target frequency band while receiving RF signals from the first frequency band, it will interfere with the reception of RF signals from the first frequency band.

[0003] Currently, the radio frequency signal of the target frequency band is suppressed by setting a filter structure on the receiving link. The passband of the filter structure includes the first frequency band and the second frequency band. When the target frequency band is close to the frequency of the second frequency band, the suppression effect of the filter structure on the radio frequency signal of the target frequency band is poor, which is not conducive to improving the quality of the radio frequency signal. Utility Model Content

[0004] In view of the above problems, this application provides an RF receiving circuit and an RF front-end module to solve the technical problem that the suppression effect on the target frequency band RF signal is poor, which is not conducive to improving the quality of RF signal.

[0005] In a first aspect, embodiments of this application provide a radio frequency receiving circuit, which includes a switching unit, a suppression unit, and a receiving link; The switching unit includes a first port, a second port, and a first switch connected between the first port and the second port. The first port is used to output a radio frequency signal of a first frequency band and / or a radio frequency signal of a second frequency band, and the second port is connected to the suppression unit. The input end of the receiving link is connected to the first port to receive radio frequency signals of the first frequency band and / or radio frequency signals of the second frequency band. The first switch is configured to control the first switch to a first state to access the suppression unit when the switching unit outputs a radio frequency signal of the first frequency band. The suppression unit is used to suppress the radio frequency signal of the target frequency band.

[0006] Optionally, the first switch is further configured to control the first switch to a second state so as not to connect to the suppression unit when the switching unit outputs the radio frequency signal of the second frequency band.

[0007] Optionally, the receiving link includes a first filter and a first low-noise amplifier connected to the first filter. The first filter is used to filter the radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band, and the first low-noise amplifier is used to amplify the filtered radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band.

[0008] Optionally, the input terminal of the first filter is connected to the first port, the output terminal of the first filter is connected to the input terminal of the first low-noise amplifier, one end of the suppression unit is connected to the second port, and the other end of the suppression unit is grounded; The first switch is configured to be turned on when the first port outputs a radio frequency signal of the first frequency band, and turned off when the first port outputs a radio frequency signal of the second frequency band.

[0009] Optionally, the suppression unit includes a first inductor and a first capacitor connected in series, the first inductor and the first capacitor being connected in series between the second port and the ground terminal.

[0010] Optionally, the suppression unit includes a first inductor and a first capacitor connected in series. The first capacitor and the first switch are integrated in a first chip and connected in series between the first port and the second port. The first inductor is disposed outside the first chip and connected between the second port and the ground terminal.

[0011] Optionally, the suppression unit includes a first inductor and a first capacitor connected in series. The switching unit and the first capacitor are integrated into a first chip. The switching unit also includes a third port. The first capacitor is connected between the third port and a ground terminal. The first inductor is disposed outside the first chip and connected between the second port and the third port.

[0012] Optionally, the suppression unit includes a second filter, the passband of which includes the target frequency band.

[0013] Optionally, the second filter is a surface acoustic wave filter or a bulk acoustic wave filter.

[0014] Optionally, the first end of the suppression unit is connected to the second port, and the second end of the suppression unit is connected to the first port and the input end of the receiving link; the first switch is configured to control the first switch to be in an off state when the switching unit outputs the radio frequency signal of the first frequency band. The first switch is also configured to control the first switch to be in an on state when the switching unit outputs the radio frequency signal of the second frequency band.

[0015] Optionally, the suppression unit includes a second inductor and a second capacitor connected in parallel, with the first end of the second inductor and the first end of the second capacitor connected to the second port, and the second end of the second inductor and the second end of the second capacitor connected to the first port and the input terminal of the receiving link.

[0016] Optionally, the switching unit and the second capacitor are integrated into the first chip; or, the switching unit is integrated into the first chip, and the second capacitor and the second inductor are disposed outside the first chip.

[0017] Optionally, the target frequency band, the first frequency band, and the second frequency band are different wireless communication frequency bands, and the frequency range of the target frequency band does not overlap with the frequency range of the first frequency band.

[0018] Optionally, the lower limit frequency of the lower frequency band in the first frequency band and the second frequency band is the first frequency, and the upper limit frequency of the higher frequency band in the first frequency band and the second frequency band is the second frequency, wherein the difference between the second frequency and the first frequency is less than or equal to 2000MHz.

[0019] Optionally, the upper limit frequency of the lower frequency band in the second frequency band and the target frequency band is the third frequency, and the lower limit frequency of the higher frequency band in the second frequency band and the target frequency band is the fourth frequency, wherein the difference between the fourth frequency and the third frequency is less than or equal to 160MHz; and / or, The center frequency of the lower frequency band in the second frequency band and the target frequency band is the fifth frequency, and the center frequency of the higher frequency band in the second frequency band and the target frequency band is the sixth frequency. The difference between the sixth frequency and the fifth frequency is less than or equal to 2100MHz.

[0020] Optionally, the lower frequency band in the first frequency band and the second frequency band is the N77 frequency band or the N78 frequency band, the higher frequency band in the first frequency band and the second frequency band is the N79 frequency band, and the target frequency band is at least one of the Wi-Fi frequency band, the B42 frequency band, the B41 frequency band, and the B3 frequency band.

[0021] Optionally, the first frequency band is the N77 or N78 band, the second frequency band is the N79 band, and the target frequency band is a Wi-Fi band; Alternatively, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band, the B42 band, or the B3 band.

[0022] Optionally, the switching unit further includes a second switch, the first end of which is used to connect to the antenna port, and the second end of which is connected to the first port or the second port.

[0023] Optionally, the first switch and the second switch are integrated within the first chip.

[0024] Secondly, embodiments of this application provide a radio frequency front-end module, including a substrate and a switching chip and a receiving link disposed on the substrate. The radio frequency front-end module further includes a suppression unit, which is used to suppress radio frequency signals in a target frequency band. The switch chip includes an antenna port, a first port, a second port, a first switch, and a second switch. The first switch is connected between the first port and the second port. One end of the second switch is connected to the antenna port, and the other end of the second switch is connected to the first port. The first port is connected to the input of the receiving link, one end of the suppression unit is connected to the second port, and the other end of the suppression unit is grounded; or, The suppression unit is connected in series between the first port and the input of the receiving link, and the input of the receiving link is also connected to the second port.

[0025] Optionally, the receiving link includes a first filter and a first low-noise amplifier connected to the first filter. The first filter is used to filter the radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band, and the first low-noise amplifier is used to amplify the filtered radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band.

[0026] Optionally, the first frequency band is the N77 or N78 band, the second frequency band is the N79 band, and the target frequency band is a Wi-Fi band; Alternatively, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band or the B42 band.

[0027] Optionally, the switch chip further includes a third switch and a fourth port, the third switch being connected between the antenna port and the fourth port, and the first port and the fourth port being respectively connected to different amplification units of the first low-noise amplifier.

[0028] Thirdly, embodiments of this application provide a radio frequency front-end module, including the radio frequency receiving circuit described above.

[0029] Fourthly, embodiments of this application provide a radio frequency front-end module applied to a communication device. In a first mode of the communication device, the radio frequency front-end module receives radio frequency signals of a first frequency band, and the communication device transmits radio frequency signals of a target frequency band. The radio frequency front-end module includes a switching chip, a first filter, and a first low-noise amplifier connected in sequence, and the switching chip includes a first switch; The radio frequency front-end module also includes a suppression unit, which is used to suppress radio frequency signals in the target frequency band; In the first mode of the communication device, the suppression unit is connected to the input terminal of the first filter via the first switch.

[0030] Optionally, in the second mode of the communication device, the radio frequency front-end module receives radio frequency signals of the second frequency band, and the communication device does not transmit radio frequency signals of the target frequency band. In the second mode of the communication device, the suppression unit is not connected to the input terminal of the first filter.

[0031] Optionally, the first frequency band is the N77 or N78 band, the second frequency band is the N79 band, and the target frequency band is a Wi-Fi band; Alternatively, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band or the B42 band.

[0032] In the RF receiving circuit and RF front-end module provided in this application embodiment, the switching unit includes a first port, a second port, and a first switch connected between the first port and the second port. The first port is used to output RF signals of a first frequency band and / or RF signals of a second frequency band, and the second port is connected to the suppression unit. The first switch is configured to control the first switch to a first state to access the suppression unit when the switching unit outputs RF signals of the first frequency band. The suppression unit is used to suppress RF signals of the target frequency band. In this way, when receiving RF signals of the first frequency band, the suppression unit is accessed to suppress RF signals of the target frequency band, thereby reducing the interference of RF signals of the target frequency band on RF signals of the first frequency band and improving the reception quality of RF signals of the first frequency band.

[0033] These or other aspects of this application will become more apparent in the following description of the embodiments. Attached Figure Description

[0034] Figure 1 A schematic diagram of the structure of a radio frequency receiving circuit provided in an embodiment of this application is shown.

[0035] Figure 2 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0036] Figure 3 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0037] Figure 4 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0038] Figure 5 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0039] Figure 6 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0040] Figure 7 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0041] Figure 8 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0042] Figure 9 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0043] Figure 10 A schematic diagram of another embodiment of the radio frequency receiving circuit provided in this application is shown.

[0044] Figure 11 A schematic diagram of the structure of a radio frequency front-end module provided in an embodiment of this application is shown.

[0045] Figure 12 A schematic diagram of another embodiment of the radio frequency front-end module provided in this application is shown.

[0046] Figure 13 A schematic diagram of another embodiment of the radio frequency front-end module provided in this application is shown.

[0047] Figure 14 for Figure 13 The diagram shows a structural schematic of one embodiment of the radio frequency front-end module.

[0048] Figure 15 for Figure 13 A schematic diagram of another embodiment of the radio frequency front-end module shown.

[0049] Figure 16 for Figure 13 A schematic diagram of another embodiment of the radio frequency front-end module shown.

[0050] Figure 17 for Figure 13 A schematic diagram of another embodiment of the radio frequency front-end module shown.

[0051] Figure 18 A schematic diagram of another embodiment of the radio frequency front-end module provided in this application is shown.

[0052] Figure 19 for Figure 18 The diagram shows a structural schematic of one embodiment of the radio frequency front-end module.

[0053] Figure 20 for Figure 18 A schematic diagram of another embodiment of the radio frequency front-end module shown.

[0054] Figure 21 A schematic diagram of another embodiment of the radio frequency front-end module provided in this application is shown.

[0055] Figure 22 A schematic diagram of the structure of a radio frequency front-end module provided in an embodiment of this application is shown.

[0056] Figure 23 A schematic diagram of the structure of a radio frequency front-end module provided in an embodiment of this application is shown. Detailed Implementation

[0057] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0058] To enable those skilled in the art to better understand the solutions of this application, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0059] In the embodiments of this application, 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 entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0060] 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 limitation, 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.

[0061] In the description of the embodiments of this application, the words "example" or "for example" are used to indicate exemplification, illustration, or description. Any embodiment or design described as "example" or "for example" in the embodiments of this application is not to be construed as being more preferred or having more advantages than another embodiment or design. The use of the words "example" or "for example" is intended to present relative concepts in a clear manner.

[0062] Furthermore, in the embodiments of this application, "multiple" refers to two or more. Therefore, in the embodiments of this application, "multiple" can also be understood as "at least two". "At least one" can be understood as one or more, such as one, two, or more. For example, including at least one means including one, two, or more, and is not limited to which ones are included. For example, including at least one of A, B, and C, then it could include A, B, C, A and B, A and C, B and C, or A and B and C.

[0063] It should be noted that in the embodiments of this application, "and / or" describes the relationship between associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. In addition, the character " / ", unless otherwise specified, generally indicates that the associated objects before and after it are in an "or" relationship.

[0064] It should be noted that in the embodiments of this application, "connection" can be understood as electrical connection. The connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through one or more other electrical components.

[0065] This application provides an RF receiving circuit 100 that can be applied to an RF front-end module. An RF front-end module is a component that integrates two or more discrete devices, such as RF switches, low-noise amplifiers, filters, duplexers, and power amplifiers, into a single independent module, thereby improving integration and hardware performance, and miniaturizing the size. Specifically, the RF front-end module used in the RF receiving circuit 100 of this application embodiment includes at least an RF switch and a low-noise amplifier to achieve the reception and amplification of RF signals. As one implementation, the RF front-end module may further include at least one filter or multiplexer to filter the received RF signal before amplification. Optionally, the RF front-end module may or may not include a power amplifier; this application does not impose any limitations on this.

[0066] The radio frequency (RF) front-end module can be applied to 4G and 5G communication devices such as smartphones, tablets, and smartwatches. Specifically, the RF receiving circuit 100 provided in this application embodiment can be applied in the RF front-end module to receive RF signals of a first frequency band and a second frequency band input from the antenna port. When receiving the RF signal of the first frequency band, the RF signal of the target frequency band is suppressed, and when receiving the RF signal of the second frequency band, the RF signal of the target frequency band is not suppressed.

[0067] One embodiment of this application provides a radio frequency receiving circuit 100. Please refer to [link to relevant documentation]. Figure 1 As shown, the radio frequency receiving circuit 100 of this embodiment includes: a switching unit 10, a suppression unit 20, and a receiving link 30.

[0068] The switching unit 10 includes a first port 11, a second port 12, and a first switch S1. The first switch S1 is connected between the first port 11 and the second port 12. The first port 11 is used to output a radio frequency signal of a first frequency band and / or a radio frequency signal of a second frequency band. The second port 12 is connected to the suppression unit 20. For example, the switching unit 10 can be integrated into a switching chip, i.e., the first switch S1 is integrated into the switching chip, which can improve the system integration.

[0069] In this configuration, the frequencies of the first and second frequency bands are similar, meaning they may not overlap. The upper limit frequency of the lower frequency band in the first and second frequency bands is very close to the lower limit frequency of the higher frequency band in the first and second frequency bands. The difference between the lower limit frequency of the higher frequency band and the upper limit frequency of the lower frequency band is less than or equal to a first preset frequency, for example, the first preset frequency value may be less than or equal to 1000MHz. Furthermore, the frequency range formed by the lower limit frequency of the lower frequency band in the first and second frequency bands and the upper limit frequency of the higher frequency band in the first and second frequency bands may be less than or equal to a second preset frequency value, for example, the second preset frequency value may be less than or equal to 2000MHz. For example, the first and second frequency bands may be two adjacent frequency bands, for example, the lower frequency band in the first and second frequency bands may be the N77 band and the higher frequency band may be the N79 band, or the lower frequency band in the first and second frequency bands may be the N78 band and the higher frequency band may be the N79 band.

[0070] The radio frequency signals of the first frequency band and the second frequency band are both output from the switching unit 10 and received by the receiving link 30.

[0071] The switching unit 10 may include an antenna end / common end, which is used to receive radio frequency signals. The antenna end / common end and the first port 11 are connected by a switching path, or the antenna end / common end and the second port 12 are connected by a switching path.

[0072] The suppression unit 20 is used to suppress the radio frequency signal of the target frequency band. For example, the radio frequency signal of the target frequency band can be the radio frequency signal transmitted by the communication device where the receiving link 30 is located. The target frequency band and the second frequency band have similar frequencies, meaning they may not overlap. The upper limit frequency of the lower frequency band in the target frequency band and the lower limit frequency of the higher frequency band in the target frequency band and the second frequency band are very close. The difference between the lower limit frequency of the higher frequency band and the upper limit frequency of the lower frequency band is less than or equal to a third preset frequency, for example, the third preset frequency value may be less than or equal to 1600MHz. Furthermore, the target frequency band and the first frequency band have different frequencies, meaning they may not overlap. The upper limit frequency of the lower frequency band in the target frequency band and the lower limit frequency of the higher frequency band in the target frequency band and the first frequency band are not close. The difference between the lower limit frequency of the higher frequency band and the upper limit frequency of the lower frequency band is greater than a fourth preset frequency, for example, the fourth preset frequency value may be greater than the third preset frequency value.

[0073] The input terminal 31 of the receiving link 30 is connected to the first port 11 to receive radio frequency signals of the first frequency band and / or radio frequency signals of the second frequency band.

[0074] In some modes / application scenarios, the first port 11 outputs a radio frequency signal of the first frequency band; in other modes / application scenarios, the first port 11 outputs a radio frequency signal of the second frequency band; in still other modes / application scenarios, for example, in carrier aggregation mode, the first port 11 outputs a radio frequency signal of the first frequency band and a radio frequency signal of the second frequency band.

[0075] The first switch S1 is configured to be in a first state to access the suppression unit 20 when the switching unit 10 outputs a radio frequency signal of the first frequency band. That is, when the switching unit 10 outputs a radio frequency signal of the first frequency band, the suppression unit 20 suppresses the radio frequency signal of the target frequency band.

[0076] In this embodiment, the radio frequency receiving circuit, when receiving radio frequency signals from the first frequency band, accesses a suppression unit to suppress radio frequency signals from the target frequency band, thereby reducing the interference of radio frequency signals from the target frequency band on radio frequency signals from the first frequency band, and thus improving the reception quality of radio frequency signals from the first frequency band.

[0077] In one implementation, the first switch S1 is further configured to control the first switch S1 to a second state so as not to connect to the suppression unit 20 when the switching unit 10 outputs a radio frequency signal of the second frequency band. For example, the first state is on and the second state is off, or the first state is off and the second state is on.

[0078] In this embodiment, when the switching unit outputs the second frequency band radio frequency signal, the suppression unit is not connected to avoid the suppression unit suppressing the second frequency band radio frequency signal with a relatively close frequency, thereby reducing the transmission loss of the second frequency band radio frequency signal and ensuring the transmission efficiency of the second frequency band radio frequency signal.

[0079] As one implementation, when the radio frequency receiving circuit 100 receives the radio frequency signal of the second frequency band, the communication device in which the radio frequency receiving circuit 100 is located does not transmit the radio frequency signal of the target frequency band, so as to avoid the radio frequency signal of the target frequency band interfering with the reception of the radio frequency signal of the second frequency band.

[0080] In some implementations, please refer to Figure 2 As shown, the receiving link 30 includes a first filter 32 and a first low-noise amplifier 33. The first low-noise amplifier 33 is connected to the first filter 32. The first filter 32 is used to filter radio frequency signals in a first frequency band and / or a second frequency band, and the first low-noise amplifier 33 is used to amplify the filtered radio frequency signals in the first frequency band and / or the second frequency band. Exemplarily, the first low-noise amplifier 33 may include at least one amplification unit that can amplify the radio frequency signal. The amplification unit may include at least two transistors, and the at least two transistors in the amplification unit may be connected to form a common-source common-gate amplifier circuit.

[0081] Specifically, when the switching unit outputs a radio frequency signal in the first frequency band, a transmission link is formed between the switching unit, the suppression unit, the first filter, and the first low-noise amplifier; when the switching unit outputs a radio frequency signal in the second frequency band, a transmission link is formed between the switching unit, the first filter, and the first low-noise amplifier.

[0082] The passband of the first filter 32 includes a first frequency band and a second frequency band. This means that the radio frequency (RF) signal from the first frequency band and / or the second frequency band output from the switching unit 10 can be transmitted to the input of the first low-noise amplifier 33 through the first filter 32. RF signals outside the passband of the first filter 32 are suppressed by the first filter 32. Although the first filter 32 has a certain suppression effect on out-of-band signals, in certain modes / application scenarios, the suppression effect of the first filter 32 on certain specific out-of-band frequency bands cannot meet the application requirements. For example, when the RF receiving circuit 100 receives the RF signal of the first frequency band, the communication device where the RF receiving circuit 100 is located transmits the RF signal of the target frequency band. Because the transmitted signal power is larger—that is, the power of the RF signal of the target frequency band is much greater than the power of the RF signal of the first frequency band—it will have a significant impact on the reception of the RF signal of the first frequency band. The suppression degree of the first filter 32 on the RF signal of the target frequency band is insufficient to meet the application requirements.

[0083] In this embodiment, the suppression unit 20 is located in front of the first filter. When the switching unit 10 outputs the radio frequency signal of the first frequency band, the suppression unit 20 first performs precise deep suppression of the radio frequency signal of the target frequency band, and then the first filter 32 performs filtering processing, which helps to improve the filtering effect of the first filter 32 and improve the quality of the radio frequency signal of the first frequency band received by the first low noise amplifier 33.

[0084] In related technologies, the suppression unit 20 is located after the first filter 32. That is, when the switching unit 10 outputs the first frequency band radio frequency signal, the first filter 32 first performs filtering processing, and then the suppression unit 20 suppresses the target frequency band radio frequency signal. The presence of the target frequency band radio frequency signal is not conducive to improving the filtering effect of the first filter 32. Furthermore, since the suppression unit 20 is located after the first filter 32, it is not conducive to integrating the first switch S1 into the switching unit 10. If the switch in the suppression unit 20 located after the first filter 32 is integrated into the switching unit before the first filter 32, the out-of-band noise of the first filter 32 (including the target frequency band radio frequency signal) will be coupled to the output of the first filter 32 through the switch, thereby weakening the filtering effect of the first filter 32 and failing to effectively suppress the target frequency band radio frequency signal.

[0085] In some implementations, please refer to [the relevant documentation]. Figure 3 As shown, the input terminal of the first filter 32 is connected to the first port 11, the output terminal of the first filter 32 is connected to the input terminal of the first low noise amplifier 33, one end of the suppression unit 20 is connected to the second port 12, and the other end of the suppression unit 20 is used for grounding.

[0086] In this configuration, the first state is on and the second state is off. The first switch S1 is configured to be on when the first port 11 outputs a radio frequency signal of the first frequency band, so that the suppression unit 20 is connected to the receiving link 30. The first switch S1 is configured to be off when the first port 11 outputs a radio frequency signal of the second frequency band, so that the suppression unit 20 is not connected to the receiving link 30.

[0087] In this embodiment, a first frequency band radio frequency signal and a second frequency band radio frequency signal are output through the first port 11, and a suppression unit is disposed between the second port and the ground terminal. When the first switch S1 is turned on, the target frequency band radio frequency signal is transmitted from the first port 11 through the turned-on first switch S1 to the suppression unit. The suppression unit presents a low impedance to the target frequency band radio frequency signal, so that the target frequency band radio frequency signal is grounded through the suppression unit, thereby achieving suppression of the target frequency band radio frequency signal.

[0088] In some implementations, please refer to Figure 4 As shown, the suppression unit 20 includes a first inductor L1 and a first capacitor C1 connected in series, and the first inductor L1 and the first capacitor C1 are connected in series between the second port 12 and the ground terminal.

[0089] In this embodiment, the resonant frequency of the suppression unit is within the frequency range of the target frequency band. The radio frequency signal of the target frequency band is shorted to ground by the first inductor and the first capacitor connected in series, thereby suppressing the radio frequency signal of the target frequency band, which helps to simplify the setting of the suppression unit.

[0090] In some implementations, please refer to Figure 5 As shown, the suppression unit 20 includes a first inductor L1 and a first capacitor C1 connected in series. The switching unit 10 and the first capacitor C1 are integrated within the first chip 10A. The switching unit 10 also includes a third port 13. The first capacitor C1 is connected between the third port 13 and the ground terminal. The first inductor L1 is disposed outside the first chip 10A and connected between the second port 12 and the third port. For example, the first chip 10A can be a switching chip.

[0091] In this embodiment, the switching unit and the first capacitor are integrated into the same chip, while the first inductor is disposed outside the first chip, which helps to save circuit area and thus achieve circuit miniaturization. For example, the first inductor can be disposed in at least one metal layer of the substrate. By wiring on the metal layer of the substrate to form the first inductor L1, the inductance of the first inductor L1 can be flexibly controlled, and it can have a higher Q value than SMD devices, thereby further reducing insertion loss; or, the first inductor L1 can be implemented using surface mount devices (SMD), which can effectively save area.

[0092] In some implementations, please refer to Figure 6 As shown, the suppression unit 20 includes a first inductor L1 and a first capacitor C1 connected in series. The first capacitor C1 and the first switch S1 are integrated in the first chip 10A, and the first capacitor C1 and the first switch S1 are connected in series between the first port 11 and the second port 12. The first inductor L1 is disposed outside the first chip 10A and connected between the second port 12 and the ground terminal.

[0093] In this embodiment, the first capacitor and the first switch are integrated into the same chip, while the first inductor is located outside the first chip. This saves circuit area and thus achieves circuit miniaturization. Compared to Figure 5 This implementation saves the third port 13, which can further reduce the area occupied by the radio frequency receiving circuit.

[0094] For example, the first inductor L1 can be disposed in at least one metal layer of the substrate. By wiring on the metal layer of the substrate to form the first inductor L1, the inductance of the first inductor L1 can be flexibly controlled, and it can have a higher Q value than SMD devices, thereby further reducing insertion loss; or, the first inductor L1 can be implemented using surface mount devices (SMDs). Using SMD devices can effectively save area.

[0095] For example, in Figures 4-6 In the various embodiments shown, the capacitance of the first capacitor C1 is greater than 0.8 pF. With the resonant frequencies of the first capacitor C1 and the first inductor L1 fixed (i.e., the product of the capacitance and inductance values ​​remains constant), different capacitance and inductance values ​​result in different suppression levels. When the inductance value is large and the capacitance value is small, the attenuation of the radio frequency signal in the target frequency band is small; conversely, when the capacitance value is large and the inductance value is small, the attenuation of the radio frequency signal in the target frequency band is high. This embodiment sets the capacitance of the first capacitor C1 to a large value greater than 0.8 pF, which can enhance the suppression level of the radio frequency signal in the target frequency band.

[0096] For example, the first chip 10A can be disposed and connected to the substrate in an inverted package manner, and the first port 11 and the second port 12 can be connected to the circuit board through a metal component, which can be a metal bump.

[0097] For example, the first chip 10A may not be packaged in an inverted manner, but may be set and connected to the substrate by wire bonding. In this case, the first port 11 and the second port 12 may be connected to the circuit board by bonding wires.

[0098] For example, such as Figure 6 As shown, the first inductor L1 can be connected to the third port 13 via a bonding wire. The parasitic inductance generated by the bonding wire can replace part of the inductance originally provided by the first inductor L1, which helps to reduce the inductance of the first inductor L1.

[0099] In some implementations, please refer to Figure 7 As shown, the suppression unit 20 includes a second filter, the passband of which includes the target frequency band.

[0100] In this embodiment, the radio frequency signal of the target frequency band is shorted to ground by a bandpass filter, thereby suppressing the radio frequency signal of the target frequency band and improving the suppression effect of the radio frequency signal of the target frequency band.

[0101] In some implementations, the second filter is a surface acoustic wave (SAW) filter or a bulk acoustic wave (BAW) filter.

[0102] As one implementation method, please refer to Figure 8 As shown, the first end of the suppression unit 20 is connected to the second port 12, and the second end of the suppression unit 20 is connected to the first port 11 and the input terminal 31 of the receiving link 30. The first switch S1 is configured to be turned off when the switching unit 10 outputs a radio frequency signal of the first frequency band, so that the suppression unit 20 can access the receiving link 30. The first switch S1 is also configured to be turned on when the switching unit 10 outputs a radio frequency signal of the second frequency band, so that the suppression unit 20 cannot access the receiving link 30.

[0103] In this embodiment, the first switch S1 is connected in parallel with the suppression unit 20. When the first switch S1 is on, the suppression unit 20 is short-circuited and thus not connected to the RF receiving circuit 100. When the first switch S1 is off, the suppression unit 20 is not short-circuited and thus connected to the RF receiving circuit 100 to suppress the RF signal of the target frequency band. The suppression unit 20 presents a high impedance to the RF signal of the target frequency band, making it difficult for the RF signal of the target frequency band to be transmitted from the second port 12 through the suppression unit 20 to the input terminal 31 of the receiving link 30, thereby achieving the suppression of the RF signal of the target frequency band.

[0104] For example, in the first mode, the switching unit 10 is used to output the radio frequency signal of the first frequency band. At this time, the first switch S1 is open, and the output path of the radio frequency signal of the first frequency band is the second port 12 - suppression unit 20 - input terminal 31 - first filter 32 - first low noise amplifier 33.

[0105] In this process, the radio frequency signal of the first frequency band first passes through the suppression unit 20 before entering the receiving link 30, and the radio frequency signal of the target frequency band is suppressed by the suppression unit 20; the radio frequency signal of the second frequency band enters the receiving link 30 directly without passing through the suppression unit 20, so as to avoid the suppression unit 20 affecting the radio frequency signal of the second frequency band.

[0106] In the second mode, the switching unit 10 is used to output the radio frequency signal of the second frequency band. At this time, the second switch S1 is turned on, and the output path of the radio frequency signal of the second frequency band is the first port 11 - input terminal 31 - first filter 32 - first low noise amplifier 33.

[0107] In this embodiment, the access state of the suppression unit 20 is changed by a switch S1 connected in parallel with the suppression unit 20. The suppression unit is located between the second port and the output of the receiving link, and no grounding point is required.

[0108] In some implementations, please refer to Figure 9 and Figure 10 As shown, the suppression unit 20 includes a second inductor L2 and a second capacitor C2 connected in parallel. The first end of the second inductor L2 and the first end of the second capacitor C2 are connected to the second port 12, and the second end of the second inductor L2 and the second end of the second capacitor C2 are connected to the first port 11 and the input terminal 31 of the receiving link 30.

[0109] In this embodiment, the resonant frequencies of the second inductor and the second capacitor are within the target frequency band. The second inductor and the second capacitor connected in parallel disconnect the radio frequency signal of the target frequency band. The radio frequency signal of the second frequency band can be suppressed by the suppression unit, which helps to simplify the setting of the suppression unit.

[0110] In some implementations, please refer to [the relevant documentation]. Figure 9 As shown, the switching unit 10 and the second capacitor C2 are integrated into the first chip 10A.

[0111] In this embodiment, the switching unit and the second capacitor are integrated into the same chip, and the second inductor can be placed outside the first chip, which helps to save circuit area and thus achieve circuit miniaturization.

[0112] For example, Figure 9 As shown, the second inductor L2 can be wound on the circuit board, or the second inductor L2 can be implemented using surface-mount devices (SMD). Compared to integrating the second inductor L2 into the chip, using an SMD inductor or a wire-wound inductor on the substrate as the second inductor L2 reduces costs.

[0113] For example, the second inductor L2 can be disposed in at least one metal layer of the substrate. By wiring on the metal layer of the substrate to form the second inductor L2, the inductance of the second inductor L2 can be flexibly controlled, and it can have a higher Q value than SMD devices, thereby further reducing insertion loss and helping to reduce manufacturing costs.

[0114] In some implementations, please refer to [the relevant documentation]. Figure 10 As shown, the switching unit 10 is integrated into the first chip 10A, and the second capacitor C2 and the second inductor L2 are disposed outside the first chip.

[0115] In this embodiment, the switching unit is integrated into the first chip, while the second capacitor and the second inductor are not integrated into the first chip, which simplifies the arrangement of the second capacitor and the second inductor.

[0116] For example, Figure 10 The second capacitor C2 shown can be implemented using SMD, and the second inductor L2 can be wound on the circuit board or implemented using SMD.

[0117] In some implementations, the target frequency band, the first frequency band, and the second frequency band are different wireless communication frequency bands, and the frequency range of the target frequency band does not overlap with the frequency range of the first frequency band.

[0118] In some implementations, the lower limit frequency of the lower frequency band in the first frequency band and the second frequency band is the first frequency, and the upper limit frequency of the higher frequency band in the first frequency band and the second frequency band is the second frequency, wherein the difference between the second frequency and the first frequency is less than or equal to 2000MHz.

[0119] In this embodiment, the frequencies of the first frequency band and the second frequency band are similar, and the same receiving link can be used to receive and process the radio frequency signals of the first frequency band and the second frequency band, so as to improve the quality of the received radio frequency signals.

[0120] For example, in the first frequency band and the second frequency band, one can be the N77 frequency band and the other can be the N79 frequency band.

[0121] For example, in the first frequency band and the second frequency band, one can be the N78 frequency band and the other can be the N79 frequency band.

[0122] In some implementations, the upper limit frequency of the lower frequency band in the second frequency band and the target frequency band is the third frequency, and the lower limit frequency of the higher frequency band in the second frequency band and the target frequency band is the fourth frequency, wherein the difference between the fourth frequency and the third frequency is less than or equal to 1600MHz. For example, the difference between the fourth frequency and the third frequency is less than or equal to 700MHz.

[0123] In this embodiment, the second frequency band and the target frequency band are similar. When the switching unit outputs the radio frequency signal of the second frequency band, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signal of the second frequency band with a similar frequency, thereby reducing the transmission loss of the radio frequency signal of the second frequency band and ensuring the transmission efficiency of the radio frequency signal of the second frequency band.

[0124] In some implementations, the center frequency of the lower frequency band in the second frequency band and the target frequency band is the fifth frequency, and the center frequency of the higher frequency band in the second frequency band and the target frequency band is the sixth frequency, wherein the difference between the sixth frequency and the fifth frequency is less than or equal to 2100MHz. For example, the difference between the sixth frequency and the fifth frequency is less than or equal to 1000MHz.

[0125] In this embodiment, the second frequency band and the target frequency band are similar. When the switching unit outputs the radio frequency signal of the second frequency band, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signal of the second frequency band with a similar frequency, thereby reducing the transmission loss of the radio frequency signal of the second frequency band and ensuring the transmission efficiency of the radio frequency signal of the second frequency band.

[0126] For example, the second frequency band is the N79 band and the target frequency band is the Wi-Fi band; for example, the second frequency band is the N77 band and the target frequency band is the B41 band.

[0127] In some implementations, the lower frequency band in the first and second frequency bands is the N77 or N78 band, the higher frequency band in the first and second frequency bands is the N79 band, and the target frequency band is at least one of the Wi-Fi band, the B42 band, and the B41 band.

[0128] In this embodiment, the N77 or N78 frequency band is close to the N79 frequency band, and the radio frequency signals of the N77 and N79 frequency bands can be processed through the same receiving link, or the radio frequency signals of the N78 and N79 frequency bands can be processed through the same receiving link; the Wi-Fi frequency band is close to the N79 frequency band, and the B42 and B41 frequency bands are close to the N77 or N78 frequency bands.

[0129] In certain specific modes, when receiving radio frequency signals from the N79 band, the communication device where the radio frequency receiving circuit 100 is located does not transmit radio frequency signals from the target band to avoid interference from the radio frequency signals from the target band to the radio frequency signals from the N79 band. In addition, the suppression unit is not connected to avoid the suppression unit from affecting the radio frequency signals from the N79 band.

[0130] In some implementations, the first frequency band is the N77 or N78 band, the second frequency band is the N79 band, and the target frequency band is the Wi-Fi band.

[0131] In this embodiment, by connecting a suppression unit when outputting radio frequency signals in the N77 or N78 bands to suppress the radio frequency signals in the Wi-Fi band, the reception quality of the radio frequency signals in the N77 or N78 bands can be improved. Furthermore, by not connecting a suppression unit when outputting radio frequency signals in the N79 band, the impact on the radio frequency signals in the N79 band can be avoided.

[0132] In certain modes, when receiving radio frequency signals from the N79 band, the communication device where the radio frequency receiving circuit 100 is located does not transmit radio frequency signals from the target band (e.g., the Wi-Fi band) to avoid interference from the target band's radio frequency signals to the N79 band's radio frequency signals. Furthermore, it does not connect to the suppression unit to avoid the suppression unit affecting the N79 band's radio frequency signals.

[0133] In some implementations, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band or the B42 band.

[0134] In this embodiment, the N77 or N78 frequency band is close to the N79 frequency band, so the radio frequency signals of the N77 and N79 frequency bands can be processed through the same receiving link, or the radio frequency signals of the N78 and N79 frequency bands can be processed through the same receiving link. The B41 or B42 frequency band is close to the N77 or N78 frequency band, so when receiving the radio frequency signal of the N79 frequency band, a suppression unit is connected to suppress the B41 or B42 frequency band, thereby reducing the frequency of the B41 frequency band. The interference of radio frequency signals from the B42 band to the radio frequency signals of the N79 band is reduced, thereby improving the reception quality of the radio frequency signals of the N79 band; and when receiving radio frequency signals from the N77 or N78 bands, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signals of the N77 or N78 bands with similar frequencies, thereby reducing the transmission loss of the radio frequency signals of the N77 or N78 bands and ensuring the transmission efficiency of the radio frequency signals of the N77 or N78 bands.

[0135] In certain modes, when receiving radio frequency signals from the N77 or N78 band, the communication device where the radio frequency receiving circuit 100 is located does not transmit radio frequency signals from the target band (e.g., the B41 or B42 band) to avoid interference from the target band's radio frequency signals to the N77 or N78 band's radio frequency signals. Furthermore, the suppression unit is not connected to avoid the suppression unit affecting the N77 or N78 band's radio frequency signals.

[0136] In some implementations, please refer to Figures 5 to 10 As shown, the switching unit 10 also includes a second switch S2. The first end of the second switch S2 is used to connect to the antenna port, and the second end of the second switch S2 is connected to the first port 11 or the second port 12.

[0137] Specifically, when the antenna port receives a radio frequency signal from the first frequency band or the second frequency band, the second switch S2 is turned on, so that the switching unit 10 outputs a radio frequency signal from the first frequency band or the second frequency band; when the antenna port receives a radio frequency signal from another frequency band, the second switch S2 is turned off, and the switching unit 10 and the receiving link 30 do not work.

[0138] In this embodiment, the RF signal of the corresponding frequency band of the output switching unit is generated by turning on the second switch, which helps to simplify the output structure of the RF signal.

[0139] In some implementations, please refer to [the relevant documentation]. Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the first switch S1 and the second switch S2 are integrated within the first chip 10A.

[0140] The first chip 10A can be a switching chip. For example, the first chip 10A may also include at least one other switching unit for outputting radio frequency signals in at least one frequency band. The other switching unit may be connected to the same antenna port as the second switch S2, or the other switching unit may be connected to other antenna ports of the first chip 10A; the other switching unit may be connected to other output ports of the first chip 10A; the other switching unit may be connected to other input terminals of the first low noise amplifier 33 through a corresponding filter for amplification by another amplification unit of the first low noise amplifier 33, or the other switching unit may be directly connected to other input terminals of the first low noise amplifier 33 without a filter for amplification by another amplification unit of the first low noise amplifier 33.

[0141] In this embodiment, integrating the first switch and the second switch into the first chip is beneficial for improving integration and reducing circuit area.

[0142] One embodiment of this application provides a radio frequency front-end module 200. Please refer to [link to relevant documentation]. Figure 11 and Figure 12 As shown, the RF front-end module 200 includes a substrate (not shown) and a switch chip 10B and a receiving link 30 disposed on the substrate. The RF front-end module 200 also includes a suppression unit 20, which is used to suppress RF signals in the target frequency band.

[0143] The switch chip 10B includes an antenna port 10a, a first port 11, a second port 12, a first switch S1, and a second switch S2. The first switch S1 is connected between the first port 11 and the second port 12. One end of the second switch S2 is connected to the antenna port 10a, and the other end of the second switch S2 is connected to the first port 11.

[0144] Among them, such as Figure 11 As shown, the first port 11 is connected to the input terminal 31 of the receiving link 30, one end of the suppression unit 20 is connected to the second port 12, and the other end of the suppression unit 20 is grounded; or, as... Figure 12 As shown, the suppression unit 20 is connected in series between the first port 11 and the input terminal 31 of the receiving link 30, and the input terminal 31 of the receiving link 30 is also connected to the second port 12.

[0145] Specifically, when the frequencies of the first and second frequency bands are similar (i.e., the first and second frequency bands do not overlap), the upper limit frequency of the lower frequency band in the first and second frequency bands is very close to the lower limit frequency of the higher frequency band in the first and second frequency bands. The difference between the lower limit frequency of the higher frequency band and the upper limit frequency of the lower frequency band is less than or equal to a first preset frequency. For example, the first preset frequency value can be less than or equal to 1000MHz. Furthermore, the frequency range (bandwidth) formed by the lower limit frequency of the lower frequency band in the first and second frequency bands and the upper limit frequency of the higher frequency band in the first and second frequency bands can be less than or equal to a second preset frequency value. For example, the second preset frequency value... The frequency value can be less than or equal to 2000MHz; for example, the first frequency band and the second frequency band can be two adjacent frequency bands. For example, the lower frequency band of the first frequency band and the higher frequency band of the second frequency band is the N77 frequency band and the higher frequency band is the N79 frequency band, or the lower frequency band of the first frequency band and the higher frequency band of the second frequency band is the N78 frequency band and the higher frequency band is the N79 frequency band. In this case, the radio frequency signal of the first frequency band and the radio frequency signal of the second frequency band can both be input from the antenna port 10a to the switch chip 10B and received by the receiving link 30. Specifically, the radio frequency signal of the first frequency band and the radio frequency signal of the second frequency band are output from the first port 11 or the second port 12 and received by the receiving link 30.

[0146] The radio frequency signal of the target frequency band can be the radio frequency signal transmitted by the communication device where the receiving link 30 is located. The frequency of the target frequency band is close to that of the second frequency band, that is, the target frequency band and the second frequency band do not overlap. The upper limit frequency of the lower frequency band of the target frequency band and the lower limit frequency of the higher frequency band of the target frequency band and the second frequency band are relatively close. The difference between the lower limit frequency of the higher frequency band and the upper limit frequency of the lower frequency band is less than or equal to a third preset frequency. For example, the value of the third preset frequency can be less than or equal to 1600MHz. Furthermore, the frequency of the target frequency band is not close to that of the first frequency band, that is, the target frequency band and the first frequency band do not overlap. The upper limit frequency of the lower frequency band of the target frequency band and the lower limit frequency of the target frequency band and the first frequency band are not close. The difference between the lower limit frequency of the higher frequency band and the upper limit frequency of the lower frequency band is greater than a fourth preset frequency. For example, the value of the fourth preset frequency can be greater than the value of the third preset frequency.

[0147] The second switch S2 is configured to turn on when the antenna port 10a receives a radio frequency signal from the first frequency band or the second frequency band, so as to output the radio frequency signal from the first frequency band or the second frequency band to the receiving link 30. When the switch chip 10B receives a radio frequency signal from another frequency band, the second switch S2 turns off.

[0148] The first switch S1 is configured such that when the antenna port 10a receives a radio frequency signal from the first frequency band, the first switch S1 is controlled to be in a first state to access the suppression unit 20. That is, when it is necessary to output a radio frequency signal from the first frequency band, the suppression unit 20 suppresses the radio frequency signal from the target frequency band. The following describes... Figure 11 and Figure 12 The access state of the suppression unit 20 is described in detail.

[0149] Please see Figure 11 As shown, the first state is on. When the antenna port 10a receives the radio frequency signal of the first frequency band, it controls the first switch S1 to be turned on to access the suppression unit 20, thereby suppressing the radio frequency signal of the target frequency band. The radio frequency signal of the first frequency band is output from the first port 11 to the input terminal 31 of the receiving link 30.

[0150] Please see Figure 12 As shown, the first state is off. When the antenna port 10a receives the radio frequency signal of the first frequency band, it controls the first switch S1 to turn off to access the suppression unit 20. After passing through the suppression unit 20, the radio frequency signal of the first frequency band is output from the first port 11 to the input terminal 31 of the receiving link 30, thereby suppressing the radio frequency signal of the target frequency band.

[0151] In this embodiment, the RF front-end module receives RF signals from the first frequency band and then uses a suppression unit to suppress RF signals from the target frequency band. This reduces interference from the target frequency band's RF signals to the first frequency band's RF signals, thereby improving the reception quality of the first frequency band's RF signals. Furthermore, since the suppression unit is located at the front end of the receiving link, the RF signals from the first frequency band are processed by the suppression unit before being transmitted to the receiving link, which helps to reduce the impact of the target frequency band's RF signals on the receiving link. At the same time, because the suppression unit is located at the front end of the receiving link, the difficulty of integrating the first switch into the switch chip is reduced. Moreover, when the first switch is integrated into the switch chip, the suppression unit's location at the front end of the receiving link can prevent the processing effect of the receiving link from deteriorating.

[0152] In one implementation, the first switch S1 is also configured to, when the antenna port 10a receives a radio frequency signal of the second frequency band, control the first switch S1 to a second state so as not to connect to the suppression unit 20. The following addresses... Figure 11 and Figure 12 The non-connection state of the suppression unit 20 is described in detail.

[0153] Please see Figure 11 As shown, the second state is off. When the antenna port 10a receives the radio frequency signal of the second frequency band, it controls the first switch S1 to turn off so as not to connect to the suppression unit 20. The suppression unit 20 does not work, and the radio frequency signal of the second frequency band is output from the first port 11 to the input terminal 31 of the receiving link 30.

[0154] Please see Figure 12 As shown, the first state is on. When the antenna port 10a receives the radio frequency signal of the second frequency band, the first switch S1 is turned on to prevent it from being connected to the suppression unit 20. The radio frequency signal of the second frequency band does not pass through the suppression unit 20. The radio frequency signal of the second frequency band is output from the second port 12 to the input terminal 31 of the receiving link 30.

[0155] In this embodiment, when receiving the radio frequency signal of the second frequency band, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signal of the second frequency band with a relatively close frequency, thereby reducing the transmission loss of the radio frequency signal of the second frequency band and ensuring the transmission efficiency of the radio frequency signal of the second frequency band.

[0156] As one implementation method, please refer to Figure 13 and Figure 14 As shown, the receiving link 30 includes a first filter 32 and a first low-noise amplifier 33. The first low-noise amplifier 33 is connected to the first filter 32. The first filter 32 is used to filter the radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band. The first low-noise amplifier 33 is used to amplify the filtered radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band.

[0157] The passband of the first filter 32 includes a first frequency band and a second frequency band, meaning that radio frequency signals in the first frequency band and / or the second frequency band can be transmitted to the input of the first low-noise amplifier 33 through the first filter 32. Radio frequency signals outside the passband of the first filter 32 are suppressed by the first filter 32. Although the first filter 32 has a certain suppression effect on out-of-band signals, in certain modes / application scenarios, the suppression effect of the first filter 32 on certain specific out-of-band frequency bands cannot meet the application requirements. For example, when the RF front-end module 200 receives the RF signal of the first frequency band, the communication device where the RF front-end module 200 is located transmits the RF signal of the target frequency band. Because the transmitted signal power is larger, that is, the power of the RF signal of the target frequency band is much greater than the power of the RF signal of the first frequency band, it will have a significant impact on the reception of the RF signal of the first frequency band. The suppression degree of the first filter 32 on the RF signal of the target frequency band is insufficient to meet the application requirements.

[0158] In this embodiment, the suppression unit 20 is located in front of the first filter. When receiving the radio frequency signal of the first frequency band, the suppression unit 20 first performs precise deep suppression on the radio frequency signal of the target frequency band, and then the first filter 32 performs filtering processing, which helps to improve the filtering effect of the first filter 32 and improve the quality of the radio frequency signal of the first frequency band received by the first low noise amplifier 33.

[0159] In related technologies, the suppression unit 20 is located after the first filter 32. That is, when receiving the radio frequency signal of the first frequency band, the first filter 32 performs filtering processing first, and then the suppression unit 20 performs precise deep suppression of the radio frequency signal of the target frequency band. The presence of the radio frequency signal of the target frequency band is not conducive to improving the filtering effect of the first filter 32. Furthermore, since the suppression unit 20 is located after the first filter 32, it is not conducive to integrating the first switch S1 into the switch chip 10B.

[0160] Please see Figure 13 As shown, when the antenna port 10a receives the radio frequency signal of the first frequency band, it controls the first switch S1 to be turned on to connect to the suppression unit 20. The radio frequency signal of the first frequency band is output from the first port 11 to the input terminal 31 of the receiving link 30, and passes through the first filter 32 and the first low noise amplifier 33 in sequence.

[0161] In some implementations, please refer to Figure 14 As shown, the suppression unit 20 includes a first inductor L1 and a first capacitor C1 connected in series, and the first inductor L1 and the first capacitor C1 are connected in series between the second port 12 and the ground terminal.

[0162] In this embodiment, the resonant frequency of the suppression unit is within the frequency range of the target frequency band. The radio frequency signal of the target frequency band is shorted to ground by the first inductor and the first capacitor connected in series, thereby suppressing the radio frequency signal of the target frequency band, which helps to simplify the setting of the suppression unit.

[0163] In some implementations, please refer to Figure 15 As shown, the suppression unit 20 includes a first inductor L1 and a first capacitor C1 connected in series. The first capacitor C1 is integrated into the switch chip 10B. The switch chip 10B also includes a third port 13. The first capacitor C1 is connected between the third port 13 and the ground terminal. The first inductor L1 is disposed outside the switch chip 10B and connected between the second port 12 and the third port.

[0164] In this embodiment, the first capacitor is integrated within the switching chip, while the first inductor is disposed outside the switching chip. This saves circuit area and thus achieves circuit miniaturization. For example, the first inductor can be disposed in at least one metal layer of the substrate. By wiring on the metal layer of the substrate to form the first inductor L1, the inductance of the first inductor L1 can be flexibly controlled, and it can have a higher Q value compared to SMD devices, thereby further reducing insertion loss. Alternatively, the first inductor L1 can be implemented using surface mount devices (SMDs), which effectively saves area.

[0165] In some implementations, please refer to Figure 16As shown, the suppression unit 20 includes a first inductor L1 and a first capacitor C1 connected in series. The first capacitor C1 and the first switch S1 are integrated in the switch chip 10B, and the first capacitor C1 and the first switch S1 are connected in series between the first port 11 and the second port 12. The first inductor L1 is disposed outside the switch chip 10B and connected between the second port 12 and the ground terminal.

[0166] In this embodiment, the first capacitor and the first switch are integrated within the switch chip, while the first inductor is located outside the switch chip. This saves circuit area and thus achieves circuit miniaturization. Compared to Figure 15 This implementation saves the third port 13, which can further reduce the area occupied by the radio frequency receiving circuit.

[0167] For example, the first inductor L1 can be disposed in at least one metal layer of the substrate. By wiring on the metal layer of the substrate to form the first inductor L1, the inductance of the first inductor L1 can be flexibly controlled, and it can have a higher Q value than SMD devices, thereby further reducing insertion loss; or, the first inductor L1 can be implemented using surface mount devices (SMDs). Using SMD devices can effectively save area.

[0168] For example, in Figures 14-16 In the various embodiments shown, the capacitance of the first capacitor C1 is greater than 0.8 pF. With the resonant frequencies of the first capacitor C1 and the first inductor L1 fixed (i.e., the product of the capacitance and inductance values ​​remains constant), different capacitance and inductance values ​​result in different suppression levels. When the inductance value is large and the capacitance value is small, the attenuation of the radio frequency signal in the target frequency band is small; conversely, when the capacitance value is large and the inductance value is small, the attenuation of the radio frequency signal in the target frequency band is high. This embodiment sets the capacitance of the first capacitor C1 to a large value greater than 0.8 pF, which can enhance the suppression level of the radio frequency signal in the target frequency band.

[0169] For example, the switch chip 10B can be disposed and connected to the substrate in an inverted package manner, and the first port 11 and the second port 12 can be connected to the circuit board through a metal component, which can be a metal bump.

[0170] For example, the switch chip 10B may not use an inverted package, but may be set and connected to the substrate by wire bonding. In this case, the first port 11 and the second port 12 may be connected to the circuit board by bonding wires.

[0171] For example, such as Figure 16As shown, the first inductor L1 can be connected to the third port 13 via a bonding wire. The parasitic inductance generated by the bonding wire can replace part of the inductance originally provided by the first inductor L1, which helps to reduce the inductance of the first inductor L1.

[0172] In some implementations, please refer to Figure 17 As shown, the suppression unit 20 includes a second filter, the passband of which includes the target frequency band.

[0173] In this embodiment, the radio frequency signal of the target frequency band is shorted to ground by a bandpass filter, thereby suppressing the radio frequency signal of the target frequency band and improving the suppression effect of the radio frequency signal of the target frequency band.

[0174] In some implementations, the second filter is a surface acoustic wave (SAW) filter or a bulk acoustic wave (BAW) filter.

[0175] Please see Figure 18 As shown, when the antenna port 10a receives the radio frequency signal of the first frequency band, it controls the first switch S1 to turn off to access the suppression unit 20. After passing through the suppression unit 20, the radio frequency signal of the first frequency band is output from the first port 11 to the input terminal 31 of the receiving link 30, and then passes through the first filter 32 and the first low noise amplifier 33 in sequence.

[0176] In this embodiment, when the first switch is integrated into the switch chip, the suppression unit is located at the front end of the receiving link, which can prevent the suppression effect of the first filter from deteriorating.

[0177] In some implementations, please refer to Figure 19 and Figure 20 As shown, the suppression unit 20 includes a second inductor L2 and a second capacitor C2 connected in parallel. The first end of the second inductor L2 and the first end of the second capacitor C2 are connected to the first port 11, and the second end of the second inductor L2 and the second end of the second capacitor C2 are connected to the second port 12 and the input terminal 31 of the receiving link 30.

[0178] In this embodiment, the resonant frequencies of the second inductor and the second capacitor are within the target frequency band. The second inductor and the second capacitor, which are connected in parallel, disconnect the radio frequency signal of the target frequency band. The radio frequency signal of the second frequency band can pass through the suppression unit, while the radio frequency signal of the target frequency band cannot pass through, thereby suppressing the radio frequency signal of the target frequency band. This simplifies the setting of the suppression unit.

[0179] In some implementations, please refer to [the relevant documentation]. Figure 19 As shown, the second capacitor C2 is integrated into the switch chip 10B.

[0180] In this embodiment, the second capacitor is integrated into the switching chip, while the second inductor can be placed outside the first chip, which helps to save circuit area and thus achieve circuit miniaturization.

[0181] For example, Figure 19 As shown, the second inductor L2 can be wound on the circuit board, or the second inductor L2 can be implemented using surface-mount devices (SMD). Compared to integrating the second inductor L2 into the chip, using an SMD inductor or a wire-wound inductor on the substrate as the second inductor L2 reduces costs.

[0182] For example, the second inductor L2 can be disposed in at least one metal layer of the substrate. By wiring on the metal layer of the substrate to form the second inductor L2, the inductance of the second inductor L2 can be flexibly controlled, and it can have a higher Q value than SMD devices, thereby further reducing insertion loss and helping to reduce manufacturing costs.

[0183] In some implementations, please refer to [the relevant documentation]. Figure 20 As shown, the second capacitor C2 and the second inductor L2 are located outside the switch chip 10B.

[0184] In this embodiment, neither the second capacitor nor the second inductor is integrated into the switching chip, which simplifies the configuration of the second capacitor and the second inductor.

[0185] For example, Figure 20 The second capacitor C2 shown can be implemented using SMD, and the second inductor L2 can be wound on the circuit board or implemented using SMD.

[0186] In some implementations, the lower limit frequency of the lower frequency band in the first frequency band and the second frequency band is the first frequency, and the upper limit frequency of the higher frequency band in the first frequency band and the second frequency band is the second frequency, wherein the difference between the second frequency and the first frequency is less than or equal to 2000MHz.

[0187] In this embodiment, the frequencies of the first frequency band and the second frequency band are similar, and the same receiving link can be used to receive and process the radio frequency signals of the first frequency band and the second frequency band, so as to reduce the number of devices in the radio frequency front-end module, reduce the area of ​​the radio frequency front-end module and reduce the cost.

[0188] For example, in the first frequency band and the second frequency band, one can be the N77 frequency band and the other can be the N79 frequency band.

[0189] For example, in the first frequency band and the second frequency band, one can be the N78 frequency band and the other can be the N79 frequency band.

[0190] In some implementations, the upper limit frequency of the lower frequency band in the second frequency band and the target frequency band is the third frequency, and the lower limit frequency of the higher frequency band in the second frequency band and the target frequency band is the fourth frequency, wherein the difference between the fourth frequency and the third frequency is less than or equal to 1600MHz. For example, the difference between the fourth frequency and the third frequency is less than or equal to 700MHz.

[0191] In this embodiment, the second frequency band and the target frequency band are similar. When receiving the radio frequency signal of the second frequency band, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signal of the second frequency band with a similar frequency, thereby reducing the transmission loss of the radio frequency signal of the second frequency band and ensuring the transmission efficiency of the radio frequency signal of the second frequency band.

[0192] In some implementations, the center frequency of the lower frequency band in the second frequency band and the target frequency band is the fifth frequency, and the center frequency of the higher frequency band in the second frequency band and the target frequency band is the sixth frequency, wherein the difference between the sixth frequency and the fifth frequency is less than or equal to 2100MHz. For example, the difference between the fourth frequency and the third frequency is less than or equal to 1000MHz.

[0193] In this embodiment, the second frequency band and the target frequency band are similar. When receiving the radio frequency signal of the second frequency band, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signal of the second frequency band with a similar frequency, thereby reducing the transmission loss of the radio frequency signal of the second frequency band and ensuring the transmission efficiency of the radio frequency signal of the second frequency band.

[0194] For example, the second frequency band is the N79 frequency band, and the target frequency band is the Wi-Fi frequency band; for example, the second frequency band is the N77 frequency band or the N78 frequency band, and the target frequency band is the B41 frequency band, the B42 frequency band, or the B3 frequency band.

[0195] In some implementations, the lower frequency band in the first and second frequency bands is the N77 or N78 band, the higher frequency band in the first and second frequency bands is the N79 band, and the target frequency band is at least one of the Wi-Fi band, the B42 band, and the B41 band.

[0196] In this embodiment, the N77 or N78 frequency band is close to the N79 frequency band, so the radio frequency signals of the N77 and N79 frequency bands can be processed through the same receiving link, or the radio frequency signals of the N78 and N79 frequency bands can be processed through the same receiving link. The Wi-Fi frequency band is close to the N79 frequency band, and the B42, B41, and B3 frequency bands are close to the N77 or N78 frequency band. When receiving radio frequency signals of the N77 or N78 frequency band, a suppression unit for suppressing the Wi-Fi frequency band is connected, which is beneficial to improving the reception quality of the radio frequency signals of the N77 or N78 frequency band. When receiving the N79 frequency band, the suppression unit for suppressing the Wi-Fi frequency band is not connected, which can avoid affecting the reception of the radio frequency signals of the N79 frequency band. Alternatively, when receiving RF signals in the N79 band, connecting a suppression unit for suppressing the B42, B41, or B3 bands can improve the reception quality of RF signals in the N79 band. When receiving RF signals in the N77 or N78 bands, not connecting a suppression unit for suppressing the B42, B41, or B3 bands can avoid affecting the reception of RF signals in the N77 or N78 bands.

[0197] In certain specific modes, when receiving radio frequency signals from the N79 band, the communication device where the radio frequency front-end module 200 is located does not transmit radio frequency signals from the target band to avoid interference from the radio frequency signals from the target band to the radio frequency signals from the N79 band. In addition, the suppression unit is not connected to avoid the suppression unit from affecting the radio frequency signals from the N79 band.

[0198] In some implementations, the first frequency band is the N77 or N78 band, the second frequency band is the N79 band, and the target frequency band is the Wi-Fi band.

[0199] In this embodiment, by connecting a suppression unit when outputting radio frequency signals in the N77 or N78 bands to suppress the radio frequency signals in the Wi-Fi band, the reception quality of the radio frequency signals in the N77 or N78 bands can be improved. Furthermore, by not connecting a suppression unit when outputting radio frequency signals in the N79 band, the impact on the radio frequency signals in the N79 band can be avoided.

[0200] In some implementations, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band, the B42 band, or the B3 band.

[0201] In this embodiment, the N77 or N78 frequency band is close to the N79 frequency band, so the radio frequency signals of the N77 and N79 frequency bands can be processed through the same receiving link, or the radio frequency signals of the N78 and N79 frequency bands can be processed through the same receiving link. The B41, B42, and B3 frequency bands are close to the N77 or N78 frequency band, so when receiving the radio frequency signal of the N79 frequency band, a suppression unit is connected to suppress the B41, B42, or B3 frequency bands, reducing the B4 frequency band signal. The interference of radio frequency signals from the B1, B42, or B3 bands on the radio frequency signals of the N79 band is reduced, thereby improving the reception quality of the radio frequency signals in the N79 band. Furthermore, when receiving radio frequency signals from the N77 or N78 bands, the suppression unit is not connected to avoid the suppression unit suppressing the radio frequency signals of the N77 or N78 bands with similar frequencies, thereby reducing the transmission loss of the radio frequency signals in the N77 or N78 bands and ensuring the transmission efficiency of the radio frequency signals in the N77 or N78 bands.

[0202] In some implementations, please refer to Figure 21 As shown, the switch chip 10B also includes a third switch S3 and a fourth port 14. The third switch S3 is connected between the antenna port 10a and the fourth port 14. The first port 11 and the fourth port 14 are respectively connected to different amplification units of the first low-noise amplifier 33.

[0203] The switching unit formed by the second switch S2 and either the first port 11 or the second port 12 is used to output a radio frequency signal in the first frequency band or the second frequency band. The switching unit formed by the third switch S3 and the fourth port 14 is used to output a radio frequency signal in at least one other frequency band. Accordingly, the first low-noise amplifier 33 may include at least two different amplification units, one of which corresponds to the first port 11 or the second port 12 and is used to amplify the radio frequency signal in the first frequency band and / or the radio frequency signal in the second frequency band; the other amplification unit corresponds to the fourth port 14 and is used to amplify the radio frequency signal in the frequency band corresponding to the third switch S3.

[0204] In some implementations, a third filter F3 may be provided between the fourth port 14 and the corresponding amplification unit. The third filter F3 is used to filter the radio frequency signal of the frequency band corresponding to the third switch S3, and the corresponding amplification unit is used to amplify the filtered radio frequency signal of the frequency band corresponding to the third switch S3.

[0205] When antenna port 10a receives a signal, the second switch S2 is turned on to output the radio frequency signal of the first frequency band or the radio frequency signal of the second frequency band; when antenna port 10a receives the radio frequency signal of the frequency band corresponding to the third switch S3, the third switch S3 is turned on to output the radio frequency signal of the frequency band corresponding to the third switch S3.

[0206] One embodiment of this application provides a radio frequency front-end module 300. Please refer to [link to relevant documentation]. Figure 22 As shown, the radio frequency front-end module 300 includes the radio frequency receiving circuit 100 described above.

[0207] In this embodiment, when receiving the radio frequency signal of the first frequency band, the access suppression unit suppresses the radio frequency signal of the target frequency band, thereby reducing the interference of the radio frequency signal of the target frequency band on the radio frequency signal of the first frequency band and improving the reception quality of the radio frequency signal of the first frequency band.

[0208] The radio frequency front-end module 300 of this embodiment is applied to a communication device. In the first working mode, the radio frequency front-end module 300 is used to receive radio frequency signals of the first frequency band, and the communication device is used to transmit radio frequency signals of the target frequency band. In the second operating mode, the RF front-end module 300 is used to receive RF signals in the second frequency band, and the communication device does not transmit RF signals in the target frequency band.

[0209] One embodiment of this application provides a radio frequency front-end module applied to a communication device. In a first mode of the communication device, the radio frequency front-end module receives radio frequency signals of a first frequency band, and the communication device transmits radio frequency signals of a target frequency band.

[0210] Please see Figure 23 As shown, the RF front-end module includes a switch chip 10B, a first filter 32, and a first low-noise amplifier 33 connected in sequence.

[0211] The radio frequency front-end module also includes a suppression unit 20, which is used to suppress radio frequency signals in the target frequency band.

[0212] In the first mode of the communication device, the suppression unit 20 is connected to the input terminal of the first filter 32 through the first switch S1.

[0213] In some implementations, in the second mode of the communication device, the radio frequency front-end module receives radio frequency signals of the second frequency band, and the communication device does not transmit radio frequency signals of the target frequency band. In the second mode of the communication device, the suppression unit 20 is not connected to the input terminal of the first filter 32.

[0214] The RF front-end module in this embodiment can adopt the structure of the RF front-end module 200 described above. For details, please refer to the description of the implementation method of the RF front-end module 200 described above, which will not be repeated here.

[0215] It should be noted that each switch in the embodiments of this application, such as any one of the first switch S1, the second switch S2, and the third switch S3, can be composed of at least one series-connected switch tube, or it can be composed of at least one series-connected switch tube and at least one parallel-connected switch tube connected together. The embodiments of this application do not impose special restrictions on the specific implementation of each switch. Here, a series-connected switch tube refers to a switch tube connected in series across the two ends of the switch, and a parallel-connected switch tube refers to a switch tube with one end grounded. Taking the first switch S1 as an example, the first switch S1 can be composed of at least one series-connected switch tube connected between the first port 11 and the second port 12. Alternatively, the first switch S1 may include at least one series-connected switch tube connected between the first port 11 and the second port 12, and at least one parallel-connected switch tube. The parallel-connected switch tube can be connected between the first port 11 and the ground terminal, or between the second port 12 and the ground terminal, or between the connection node of two adjacent series-connected switch tubes and the ground terminal.

[0216] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A radio frequency receiving circuit, characterized in that, The radio frequency receiving circuit includes a switching unit, a suppression unit, and a receiving link; The switching unit includes a first port, a second port, and a first switch connected between the first port and the second port. The first port is used to output a radio frequency signal of a first frequency band and / or a radio frequency signal of a second frequency band, and the second port is connected to the suppression unit. The input end of the receiving link is connected to the first port to receive radio frequency signals of the first frequency band and / or radio frequency signals of the second frequency band. The first switch is configured to control the first switch to a first state to access the suppression unit when the switching unit outputs a radio frequency signal of the first frequency band. The suppression unit is used to suppress the radio frequency signal of the target frequency band.

2. The radio frequency receiving circuit according to claim 1, characterized in that, The first switch is also configured to control the first switch to a second state so as not to connect to the suppression unit when the switching unit outputs the radio frequency signal of the second frequency band.

3. The radio frequency receiving circuit according to claim 2, characterized in that, The receiving link includes a first filter and a first low-noise amplifier connected to the first filter. The first filter is used to filter the radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band, and the first low-noise amplifier is used to amplify the filtered radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band.

4. The radio frequency receiving circuit according to claim 3, characterized in that, The input terminal of the first filter is connected to the first port, the output terminal of the first filter is connected to the input terminal of the first low-noise amplifier, one end of the suppression unit is connected to the second port, and the other end of the suppression unit is used for grounding; The first switch is configured to be turned on when the first port outputs a radio frequency signal of the first frequency band, and turned off when the first port outputs a radio frequency signal of the second frequency band.

5. The radio frequency receiving circuit according to claim 4, characterized in that, The suppression unit includes a first inductor and a first capacitor connected in series, with the first inductor and the first capacitor connected in series between the second port and the ground terminal.

6. The radio frequency receiving circuit according to claim 4, characterized in that, The suppression unit includes a first inductor and a first capacitor connected in series. The first capacitor and the first switch are integrated in a first chip and connected in series between the first port and the second port. The first inductor is disposed outside the first chip and connected between the second port and the ground terminal.

7. The radio frequency receiving circuit according to claim 4, characterized in that, The suppression unit includes a first inductor and a first capacitor connected in series. The switching unit and the first capacitor are integrated into a first chip. The switching unit also includes a third port. The first capacitor is connected between the third port and a ground terminal. The first inductor is disposed outside the first chip and connected between the second port and the third port.

8. The radio frequency receiving circuit according to claim 4, characterized in that, The suppression unit includes a second filter, the passband of which includes the target frequency band.

9. The radio frequency receiving circuit according to claim 8, characterized in that, The second filter is a surface acoustic wave filter or a bulk acoustic wave filter.

10. The radio frequency receiving circuit according to claim 2, characterized in that, The first end of the suppression unit is connected to the second port, and the second end of the suppression unit is connected to the first port and the input end of the receiving link; the first switch is configured to control the first switch to be in an off state when the switching unit outputs the radio frequency signal of the first frequency band. The first switch is also configured to control the first switch to be in an on state when the switching unit outputs the radio frequency signal of the second frequency band.

11. The radio frequency receiving circuit according to claim 10, characterized in that, The suppression unit includes a second inductor and a second capacitor connected in parallel. The first end of the second inductor and the first end of the second capacitor are connected to the second port, and the second end of the second inductor and the second end of the second capacitor are connected to the first port and the input terminal of the receiving link.

12. The radio frequency receiving circuit according to claim 11, characterized in that, The switching unit and the second capacitor are integrated within the first chip; or, the switching unit is integrated within the first chip, and the second capacitor and the second inductor are disposed outside the first chip.

13. The radio frequency receiving circuit according to any one of claims 1 to 12, characterized in that, The target frequency band, the first frequency band, and the second frequency band are different wireless communication frequency bands, and the frequency range of the target frequency band does not overlap with the frequency range of the first frequency band.

14. The radio frequency receiving circuit according to claim 13, characterized in that, The lower limit frequency of the lower frequency band in the first frequency band and the second frequency band is the first frequency, and the upper limit frequency of the higher frequency band in the first frequency band and the second frequency band is the second frequency. The difference between the second frequency and the first frequency is less than or equal to 2000MHz.

15. The radio frequency receiving circuit according to claim 14, characterized in that, The upper limit frequency of the lower frequency band in the second frequency band and the target frequency band is the third frequency, and the lower limit frequency of the higher frequency band in the second frequency band and the target frequency band is the fourth frequency, wherein the difference between the fourth frequency and the third frequency is less than or equal to 1600MHz; and / or, The center frequency of the lower frequency band in the second frequency band and the target frequency band is the fifth frequency, and the center frequency of the higher frequency band in the second frequency band and the target frequency band is the sixth frequency. The difference between the sixth frequency and the fifth frequency is less than or equal to 2100MHz.

16. The radio frequency receiving circuit according to claim 15, characterized in that, The lower frequency band in the first frequency band and the second frequency band is the N77 frequency band or the N78 frequency band, the higher frequency band in the first frequency band and the second frequency band is the N79 frequency band, and the target frequency band is at least one of the Wi-Fi frequency band, the B42 frequency band, the B41 frequency band, and the B3 frequency band.

17. The radio frequency receiving circuit according to claim 16, characterized in that, The first frequency band is either the N77 or N78 frequency band, the second frequency band is the N79 frequency band, and the target frequency band is a Wi-Fi frequency band; Alternatively, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band, the B42 band, or the B3 band.

18. The radio frequency receiving circuit according to any one of claims 1 to 10, characterized in that, The switching unit further includes a second switch, the first end of which is used to connect to the antenna port, and the second end of which is connected to either the first port or the second port.

19. The radio frequency receiving circuit according to claim 18, characterized in that, The first switch and the second switch are integrated within the first chip.

20. A radio frequency front-end module, characterized in that, The module includes a substrate and a switching chip and a receiving link disposed on the substrate. The radio frequency front-end module also includes a suppression unit, which is used to suppress radio frequency signals in the target frequency band. The switch chip includes an antenna port, a first port, a second port, a first switch, and a second switch. The first switch is connected between the first port and the second port. One end of the second switch is connected to the antenna port, and the other end of the second switch is connected to the first port. The first port is connected to the input of the receiving link, one end of the suppression unit is connected to the second port, and the other end of the suppression unit is grounded; or, The suppression unit is connected in series between the first port and the input of the receiving link, and the input of the receiving link is also connected to the second port.

21. The radio frequency front-end module according to claim 20, characterized in that, The receiving link includes a first filter and a first low-noise amplifier connected to the first filter. The first filter is used to filter the radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band, and the first low-noise amplifier is used to amplify the filtered radio frequency signal of the first frequency band and / or the radio frequency signal of the second frequency band.

22. The radio frequency front-end module according to claim 21, characterized in that, The first frequency band is either the N77 or N78 frequency band, the second frequency band is the N79 frequency band, and the target frequency band is a Wi-Fi frequency band; Alternatively, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band or the B42 band.

23. The radio frequency front-end module according to claim 21, characterized in that, The switching chip also includes a third switch and a fourth port. The third switch is connected between the antenna port and the fourth port. The first port and the fourth port are respectively connected to different amplification units of the first low-noise amplifier.

24. A radio frequency front-end module, characterized in that, Includes the radio frequency receiving circuit as described in any one of claims 1 to 19.

25. A radio frequency front-end module, used in communication equipment, characterized in that, In the first mode of the communication device, the radio frequency front-end module receives radio frequency signals of the first frequency band, and the communication device transmits radio frequency signals of the target frequency band; The radio frequency front-end module includes a switching chip, a first filter, and a first low-noise amplifier connected in sequence, and the switching chip includes a first switch; The radio frequency front-end module also includes a suppression unit, which is used to suppress radio frequency signals in the target frequency band; In the first mode of the communication device, the suppression unit is connected to the input terminal of the first filter via the first switch.

26. The radio frequency front-end module according to claim 25, characterized in that, In the second mode of the communication device, the radio frequency front-end module receives radio frequency signals of the second frequency band, and the communication device does not transmit radio frequency signals of the target frequency band. In the second mode of the communication device, the suppression unit is not connected to the input terminal of the first filter.

27. The radio frequency front-end module according to claim 26, characterized in that, The first frequency band is either the N77 or N78 frequency band, the second frequency band is the N79 frequency band, and the target frequency band is a Wi-Fi frequency band; Alternatively, the first frequency band is the N79 band, the second frequency band is the N77 band or the N78 band, and the target frequency band is the B41 band or the B42 band.

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