Radio-frequency front-end module, radio-frequency transceiving apparatus, and electronic device

Abstract

The present application relates to the technical field of radio frequencies. Provided are a radio-frequency front-end module, a radio-frequency transceiving apparatus, and an electronic device. The present application aims to mitigate the degradation of radio-frequency performance of an electronic device that is caused by insufficient antenna isolation and to address radiated spurious emissions from a radio-frequency transceiving apparatus. The radio-frequency module comprises a first radio-frequency channel and a second radio-frequency channel, the first radio-frequency channel comprising a radio-frequency processing device, a filter circuit, and a first antenna, wherein the radio-frequency processing device is coupled to the first antenna by means of the filter circuit; and the second radio-frequency channel comprising a second antenna. The filter circuit is used for suppressing, when the first antenna receives a signal transmitted by the second antenna, the signal transmitted by the second antenna from being transmitted to the radio-frequency processing device, or for suppressing, when the signal transmitted by the second antenna is transmitted to the radio-frequency processing device and the signal transmitted by the second antenna is distorted and generates harmonics, the harmonics from being transmitted from the radio-frequency processing device to the first antenna.

Description

A radio frequency front-end module, a radio frequency transceiver and electronic equipment

[0001] This application claims priority to two Chinese patent applications filed on October 17, 2024, with application number 202411450773.X and entitled "A Radio Frequency Module and Electronic Device", and another filed on October 17, 2024, with application number 202411450837.6 and entitled "A Radio Frequency Front-End Module, Radio Frequency Transceiver and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of radio frequency, and more particularly to a radio frequency front-end module, a radio frequency transceiver device, and an electronic device. Background Technology

[0003] In modern communication systems, to meet the requirements of electronic equipment communication performance and antenna structure adaptation, the spacing between different antenna locations is small, resulting in poor isolation between antennas. When antenna isolation is poor, nonlinear devices in the RF path of an antenna may be excited by signals emitted from adjacent antenna RF paths, leading to excessive harmonics in the electronic equipment. RF switches are common components in RF front-end modules, used to switch between transmitting and receiving different RF signals, and are widely used in RF transceivers such as mobile phones, base stations, and satellite communications. If the isolation of the RF switch is poor, RF signal leakage will occur. When the leaked RF signal is transmitted to the nonlinear devices in the RF front-end module, the nonlinear devices will cause waveform distortion of the leaked RF signal, thereby generating harmonics. Excessive harmonics will affect the RF performance of the electronic equipment. Summary of the Invention

[0004] This application provides an RF front-end module, an RF transceiver, and an electronic device to improve the problem of reduced RF performance of electronic devices due to antenna isolation and to improve the radiated spurious problem of the RF transceiver when the RF switch isolation is poor.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, this application provides a radio frequency (RF) front-end module, including a first RF channel and a second RF channel. The first RF channel includes an RF processing device, a filtering circuit, and a first antenna. The RF processing device is coupled to the first antenna through the filtering circuit. The second RF channel includes a second antenna. The filtering circuit is used to suppress the transmission of the signal transmitted by the second antenna to the RF processing device when the first antenna receives the signal transmitted by the second antenna, or to suppress the transmission of harmonics from the RF processing device to the first antenna when the signal transmitted by the second antenna is transmitted to the RF processing device and the signal transmitted by the second antenna is distorted and generates harmonics.

[0007] In the above technical solution, the influence of the signal transmitted by the second RF channel on the RF processing device in the first RF channel is reduced by the filtering circuit, so that the radiation value of the RF processing device meets the design requirements, thereby improving the impact of excessive radiation value on the RF performance of electronic equipment.

[0008] In one possible implementation of the first aspect, the radio frequency processing device is a nonlinear device.

[0009] In another possible implementation of the first aspect, the isolation between the first antenna and the second antenna is less than the isolation threshold.

[0010] In another possible implementation of the first aspect, the operating frequency band of the first radio frequency channel does not overlap with the operating frequency band of the second radio frequency channel.

[0011] In another possible implementation of the first aspect, the fact that the operating frequency band of the first radio frequency channel does not overlap with the operating frequency band of the second radio frequency channel includes: the maximum frequency of the frequency band of the signal transmitted by the second radio frequency channel is less than the minimum frequency of the frequency band of the signal received by the first radio frequency channel, or the minimum frequency of the frequency band of the signal transmitted by the second radio frequency channel is greater than the maximum frequency of the frequency band of the signal received by the first radio frequency channel.

[0012] In another possible implementation of the first aspect, the filtering circuit includes a first filtering circuit, through which the radio frequency processing device is coupled to the first antenna;

[0013] The first filtering circuit is configured to suppress the transmission of the signal transmitted by the second antenna to the radio frequency processing device when the first antenna receives the signal transmitted by the second antenna.

[0014] In the above technical solution, when the frequency band of the signal received by the first radio frequency channel does not overlap with the frequency band of the signal transmitted by the second radio frequency channel, by suppressing the interference signal from entering the nonlinear device along the radio frequency channel, the nonlinear device in the first radio frequency channel can be prevented from being excited without changing the transmission power of the second radio frequency channel, thereby reducing the impact on the radio frequency performance of the electronic device.

[0015] In another possible implementation of the first aspect, the operating frequency band of the first radio frequency channel coincides with the operating frequency band of the second radio frequency channel.

[0016] In another possible implementation of the first aspect, the overlap of the operating frequency band of the first radio frequency channel with the operating frequency band of the second radio frequency channel includes: the operating frequency band of the first radio frequency channel partially overlaps with the operating frequency band of the second radio frequency channel, or the operating frequency band of the first radio frequency channel and the operating frequency band of the second radio frequency channel have a complete coverage relationship.

[0017] In another possible implementation of the first aspect, the filtering circuit includes a second filtering circuit, through which the radio frequency processing device is coupled to the first antenna;

[0018] The second filter circuit is configured to suppress the transmission of harmonics from the radio frequency processing device to the first antenna when the signal transmitted by the second antenna is transmitted to the radio frequency processing device and harmonics are generated by the distortion of the signal transmitted by the second antenna.

[0019] In the above technical solution, when the frequency band of the radio frequency signal transmitted by the radio frequency channel does not overlap with the frequency band of the radio frequency signal transmitted by the adjacent radio frequency channel, the harmonic propagation in the radio frequency channel is suppressed, and the harmonics are prevented from being radiated through the first antenna, thereby further reducing the impact on the radio frequency performance of the electronic device.

[0020] In another possible implementation of the first aspect, the filtering circuit includes a first filtering circuit and a second filtering circuit. The radio frequency processing device is coupled to the first antenna in sequence through the first filtering circuit and the second filtering circuit. The first filtering circuit is configured to suppress the transmission of the signal transmitted by the second antenna to the radio frequency processing device when the first antenna receives the signal transmitted by the second antenna. The second filtering circuit is configured to suppress the transmission of harmonics from the radio frequency processing device to the first antenna when the signal transmitted by the second antenna is transmitted to the radio frequency processing device and the signal transmitted by the second antenna is distorted and generates harmonics.

[0021] In another possible implementation of the first aspect, the RF front-end module further includes a shield, and the RF processing device is disposed within the shield.

[0022] Secondly, a radio frequency (RF) front-end module is provided. This RF front-end module includes an RF switch, an RF processing device, and a filtering circuit. The RF switch includes a first RF terminal, a second RF terminal, and an antenna terminal. The first and second RF terminals are respectively coupled to corresponding RF processing devices, and the antenna terminal is used to couple an antenna. The RF switch is configured to: control the transmission of a first RF signal between the first RF terminal and the antenna terminal; or, control the transmission of a second RF signal between the second RF terminal and the antenna terminal. The first RF processing device is coupled to the second RF terminal through the filtering circuit. The first RF processing device is a non-linear device. The filtering circuit is used to suppress the transmission of the first RF signal to the first RF processing device when the first RF signal is transmitted to the second RF terminal; or, when the first RF signal is transmitted to the first RF processing device and harmonics are generated due to distortion, it suppresses the harmonics of the first RF signal transmitted from the first RF processing device to the second RF terminal.

[0023] This application's embodiments suppress the transmission of signals in a specific frequency band by setting up a filtering circuit, causing a significant attenuation of the signal strength after passing through the filtering circuit. When the first radio frequency (RF) signal leaks to the second RF terminal, the filtering circuit suppresses the transmission of the first RF signal to the first RF processing device, thereby effectively reducing harmonics generated by the first RF signal exciting the first RF processing device and lowering harmonic radiation. When the first RF signal leaks to the first RF processing device and has already excited the nonlinear device to generate harmonics, the filtering circuit suppresses the transmission of harmonics of the first RF signal from the first RF processing device to the second RF terminal, thereby lowering harmonic radiation. This application's embodiments improve the radiated spurious emissions problem of the RF transceiver by setting a filtering circuit between the nonlinear device and the RF terminal of the RF switch.

[0024] In some possible implementations, the filtering circuit includes a first filtering circuit, through which the first radio frequency (RF) processing device is coupled to a second RF terminal. When the first RF signal is transmitted to the second RF terminal, the end of the first filtering circuit connected to the second RF terminal can detect the leaked first RF signal. The first filtering circuit is used to suppress the transmission of the first RF signal to the first RF processing device, thereby reducing the signal strength of the first RF signal at the end of the first filtering circuit connected to the first RF processing device, to the point that the leaked first RF signal may not even be detected. This reduces the harmonics generated by the first RF signal transmitted to the first RF processing device, thereby reducing the harmonic transmission of the first RF signal to the antenna, reducing harmonic radiation, and improving the radiated spurious emissions problem of the RF transceiver.

[0025] In some possible implementations, the frequency bands of the first radio frequency signal and the second radio frequency signal do not overlap. This allows the first filter circuit to suppress the transmission of the first radio frequency signal leaking to the second radio frequency terminal to the first radio frequency processing device, without affecting the transmission of the second radio frequency signal between the second radio frequency terminal and the first radio frequency processing device, thus ensuring that the second radio frequency signal can be transmitted and received through the second radio frequency terminal.

[0026] In some possible implementations, the filtering circuit includes a second filtering circuit, through which the first RF processing device is coupled to a second RF terminal. When a first RF signal is transmitted to the first RF processing device (a nonlinear device), the first RF processing device distorts the first RF signal, generating harmonics. The second filtering circuit is used to suppress the harmonics of the first RF signal transmitted from the first RF processing device to the second RF terminal. This reduces or even eliminates the transmission of harmonics of the first RF signal to the antenna, reducing harmonic radiation on the antenna and thus improving the radiated spurious emissions problem of the RF transceiver.

[0027] In some possible implementations, the frequency bands of the harmonics of the first radio frequency signal do not overlap with the frequency bands of the second radio frequency signal. This allows the second filter circuit to suppress only the harmonics of the first radio frequency signal transmitted from the first radio frequency processing device to the second radio frequency terminal, while also ensuring that the second radio frequency signal can be transmitted between the second radio frequency terminal and the first radio frequency processing device.

[0028] In some possible implementations, the filtering circuit includes a first filtering circuit and a second filtering circuit, and the first radio frequency (RF) processing device is coupled to a second RF terminal through the first and second filtering circuits. The first filtering circuit is configured to suppress the transmission of the first RF signal to the first RF processing device when the first RF signal is transmitted to the second RF terminal. The second filtering circuit is configured to suppress the harmonics of the first RF signal transmitted from the first RF processing device to the second RF terminal when the first RF signal is transmitted to the first RF processing device and harmonics are generated due to distortion. By simultaneously providing the first and second filtering circuits, this application reduces harmonics generated when the first RF signal is transmitted to the first RF processing device. Furthermore, the second filtering circuit suppresses the transmission of harmonics of the first RF signal to the second RF terminal. This significantly reduces harmonic radiation generated on the antenna and effectively improves the radiated spurious emissions problem of the RF transceiver.

[0029] In some possible implementations, a grounding circuit is also included, which is coupled to the second radio frequency terminal. By outputting the first radio frequency signal transmitted to the second radio frequency terminal to ground through the grounding circuit, the transmission of the first radio frequency signal to the first radio frequency processing device can be avoided.

[0030] In some possible implementations, the grounding circuit is configured to transmit the first radio frequency (RF) signal to ground by grounding the second RF terminal when the first RF signal is transmitted to the second RF terminal. This reduces harmonics generated when the first RF signal is transmitted to the first RF processing device, thereby reducing harmonic transmission of the first RF signal to the antenna, reducing harmonic radiation, and improving the radiated spurious problem of the RF transceiver.

[0031] In some possible implementations, a shielding enclosure is also included, within which the first radio frequency processing device is disposed. The shielding enclosure can shield the harmonic radiation generated on the first radio frequency processing device (i.e., the nonlinear device), thereby reducing the interference of harmonic radiation on other devices inside the electronic device and further improving the radiated spurious problem of the radio frequency transceiver.

[0032] Thirdly, a radio frequency transceiver is provided. This radio frequency transceiver includes a modem, a radio frequency chip, an antenna, and a radio frequency front-end module as described in the first aspect; wherein the modem is sequentially connected to the antenna via the radio frequency chip, the radio frequency front-end module, and so on.

[0033] Fourthly, an electronic device is provided. This electronic device includes a processor and the radio frequency transceiver device described in the second aspect above, the processor being coupled to the radio frequency transceiver device.

[0034] It should be understood that the technical effects of the third and fourth aspects can be referred to the technical effects of the first or second aspects and any of their embodiments, and will not be repeated here. Attached Figure Description

[0035] Figure 1 is a schematic diagram of the structure of the electronic device provided in an embodiment of this application;

[0036] Figure 2 is a schematic diagram of the structure of the radio frequency transceiver provided in the embodiment of this application;

[0037] Figure 3 is a schematic diagram of the structure of a radio frequency front-end module provided in an embodiment of this application;

[0038] Figure 4 is a schematic diagram of another radio frequency front-end module provided in an embodiment of this application;

[0039] Figure 5 is a schematic diagram of the structure of the radio frequency front-end module in the related technology provided in the embodiments of this application;

[0040] Figure 6 is a schematic diagram of another radio frequency front-end module provided in an embodiment of this application;

[0041] Figure 7 is a schematic diagram of another radio frequency front-end module provided in an embodiment of this application;

[0042] Figure 8 is a schematic diagram showing the relationship between the operating frequency bands of a first radio frequency channel and a second radio frequency channel provided in an embodiment of this application;

[0043] Figure 9 is a circuit diagram of a filter circuit provided in an embodiment of this application;

[0044] Figure 10 is a circuit diagram of another filtering circuit provided in an embodiment of this application;

[0045] Figure 11 is a schematic diagram of another radio frequency front-end module provided in an embodiment of this application;

[0046] Figure 12 is a schematic diagram showing the relationship between the operating frequency bands of the first radio frequency channel and the second radio frequency channel provided in another embodiment of this application;

[0047] Figure 13 is a schematic diagram of another radio frequency front-end module provided in an embodiment of this application;

[0048] Figure 14 is a schematic diagram of another radio frequency front-end module provided in an embodiment of this application;

[0049] Figure 15 is a schematic diagram of a general radio frequency switch provided in an embodiment of this application;

[0050] Figure 16 is a schematic diagram of radiated stray radiation when the isolation of the radio frequency switch provided in the embodiment of this application is poor;

[0051] Figure 17 is a schematic diagram of the structure of the first type of radio frequency front-end module provided in the embodiment of this application;

[0052] Figure 18 is a schematic diagram of signal transmission in the first type of radio frequency front-end module provided in this application, where the first filter circuit suppresses leakage of the first radio frequency signal and transmits it to the nonlinear device.

[0053] Figure 19 is a schematic diagram of signal transmission in the second filter circuit of the first type of radio frequency front-end module provided in the embodiment of this application, which suppresses the transmission of harmonics to the radio frequency switch.

[0054] Figure 20 is a schematic diagram of the structure of the second type of radio frequency front-end module provided in the embodiment of this application;

[0055] Figure 21 is a schematic diagram of the structure of the third type of radio frequency front-end module provided in the embodiment of this application;

[0056] Figure 22 is a structural schematic diagram of the fourth type of radio frequency front-end module provided in the embodiments of this application;

[0057] Figure 23 is a schematic diagram of signal transmission in the grounding circuit of the fourth type of radio frequency front-end module provided in the embodiment of this application, in which the leaked first radio frequency information is transmitted to ground. Detailed Implementation

[0058] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0059] The terms "first" and "second" used in the embodiments of this application are only used to distinguish features of the same type and should not be construed as indicating relative importance, quantity, order, etc.

[0060] The terms "exemplary" or "for example" used in the embodiments of this application are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0061] The terms "coupling" and "connection" used in the embodiments of this application should be interpreted broadly. For example, they can refer to a physical direct connection or an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors or other electronic devices.

[0062] This application provides an electronic device, which can be fixed or mobile. Additionally, this electronic device may also be referred to as user equipment (UE), terminal, terminal device, mobile station (MS), mobile terminal (MT), access terminal device, vehicle-mounted terminal device, industrial control terminal device, mobile station, remote station, remote terminal device, mobile device, wireless communication device, terminal agent, or terminal device, etc. For example, the electronic device may be a mobile phone, tablet, desktop computer, laptop computer, all-in-one computer, vehicle terminal, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, wearable device, terminal device in future mobile communication networks, or terminal device in future evolved public land mobile network (PLMN), etc.

[0063] Taking a mobile phone as an example, Figure 1 shows a possible structure of the electronic device. The electronic device 100 may include a processor 110, an external memory interface 130, an internal memory 140, a universal serial bus (USB) interface (hereinafter referred to as USB interface 150), a power management module 160, a battery 161, a wireless charging coil 162, a radio frequency transceiver 120, an audio module 170, a sensor module 180, buttons 191, a motor 192, an indicator 193, a camera 194, a display screen 195, and a subscriber identification module (SIM) card interface (hereinafter referred to as SIM card interface 196), etc.

[0064] The sensor module 180 may include pressure sensors, gyroscope sensors, barometric pressure sensors, magnetic sensors, accelerometers, distance sensors, proximity sensors, fingerprint sensors, temperature sensors, touch sensors, ambient light sensors, bone conduction sensors, etc.

[0065] It is understood that the interface connection relationships between the modules illustrated in the embodiments of this application are merely illustrative and do not constitute a specific limitation on the electronic device 100. In other embodiments of this application, the electronic device 100 may include more or fewer components than illustrated, or combine some components, or split some components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0066] In some examples, processor 110 may include one or more processing units; wherein, processing units may include field-programmable gate arrays (FPGAs), central processing units (CPUs), application processors (APs), network processors (NPs), digital signal processors (DSPs), microcontroller units (MCUs), programmable logic devices (PLDs), graphics processing units (GPUs), image signal processors (ISPs), controllers, video codecs, baseband processors, and neural-network processing units (NPUs), etc. In some examples, different processing units may be independent devices; for example, processor 110 may be a baseband processor. In some examples, processor 110 may also be a system-on-a-chip (SoC) integrating multiple processing units.

[0067] The processor 110 may also include a memory for storing computer instructions and data. In some embodiments, the memory in the processor 110 is a cache. This memory can store computer instructions or data that the processor 110 has just used or that are used repeatedly. If the processor 110 needs to use the same computer instructions or data again, it can retrieve them directly from the memory. This avoids repeated accesses, reduces the waiting time of the processor 110, and thus improves the efficiency of the system.

[0068] The external storage interface 130 can be used to connect an external memory card, such as a micro SanDisk (Micro SD) card, to expand the storage capacity of the electronic device 100. The external memory card communicates with the processor 110 through the external storage interface 130 to perform data storage functions. For example, music, video, and other files can be saved on the external memory card.

[0069] Internal memory 140 can be used to store computer executable program code, which includes computer instructions. Processor 110 executes various functional applications and data processing of electronic device 100 by running the computer instructions stored in internal memory 140. In addition, internal memory 140 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, universal flash storage (UFS), etc.

[0070] The memory involved in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0071] The audio module 170 may include a speaker, receiver, microphone, and headphone jack. The electronic device 100 can implement audio functions, such as music playback and recording, through the audio module 170 and processor 110.

[0072] Audio module 170 is used to convert digital audio information into analog audio signal output, and also to convert analog audio input into digital audio signal. In some embodiments, audio module 170 may be located in processor 110, or some functional modules of audio module 170 may be located in processor 110. A speaker, also called a "loudspeaker," is used to convert audio electrical signals into sound signals. A receiver, also called a "handpiece," is used to convert audio electrical signals into sound signals. A microphone, also called a "microphone," is used to convert sound signals into electrical signals. Electronic device 100 may be equipped with at least one microphone. A headphone jack is used to connect wired headphones. The headphone jack may be a USB interface 150, or a 3.5mm Open Mobile Terminal Platform (OMTP) standard interface, or a Cellular Telecommunications Industry Association of the USA (CTIA) standard interface.

[0073] Buttons 191 include a power button, volume buttons, etc. Buttons 191 can be mechanical buttons or touch-sensitive buttons. The electronic device 100 can receive input from buttons 191 and generate key signal inputs related to user settings and function control. Motor 192 can generate vibration alerts. Motor 192 can be used for incoming call vibration alerts or for touch vibration feedback. Indicator 193 can be an indicator light, used to indicate charging status, battery level changes, messages, missed calls, notifications, etc. SIM card interface 196 is used to connect a SIM card. The SIM card can be inserted into or removed from the SIM card interface 196 to achieve contact and separation with the electronic device 100. The electronic device 100 can support one or N SIM card interfaces 196, where N is a positive integer greater than 1. SIM card interfaces 196 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. In some embodiments, the electronic device 100 employs an embedded SIM (eSIM) card, which can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

[0074] Electronic device 100 can perform shooting functions through an ISP, camera 194, video codec, GPU, display 195, and processor 110. The ISP is used to process data fed back by the camera 194. In some embodiments, the ISP can be set in the camera 194. The camera 194 is used to capture still images or videos. In some embodiments, electronic device 100 may include one or N cameras 194, where N is a positive integer greater than 1.

[0075] Electronic device 100 can implement display functions through a GPU, a display screen 195, and a processor 110. The GPU is a microprocessor 110 for image processing, connected to the display screen 195 and the processor 110. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs, which execute computer instructions to generate or modify display information.

[0076] The display screen 195 is used to display images, videos, etc. The display screen 195 includes a display panel. In some embodiments, the electronic device 100 may include one or more display screens 195. In other embodiments, the touchscreen in the display screen 195 may be a foldable screen.

[0077] Battery 161 may include one or more cells, and multiple cells may be connected in series, parallel or other ways to supply power to the load.

[0078] The power management module 160 receives charging input from a charger. The charger can be a wireless charger, such as a wireless charging dock or other electronic devices with reverse wireless charging capabilities. The power management module 160 can receive wireless charging input via the wireless charging coil 162 of the electronic device 100. The charger can also be a wired charger; for example, the power management module 160 can receive charging input from a wired charger via a USB interface 150.

[0079] The processor 110 is coupled to the radio frequency transceiver 120 to realize the 2G / 3G / 4G / 5G mobile communication and wireless communication functions of the electronic device 100. The wireless communication may include Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time-Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), Wireless Local Area Networks (WLAN), Bluetooth (BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Infrared (IR), Near Field Communication (NFC), etc.

[0080] Figure 2 shows a schematic diagram of a radio frequency transceiver device. As shown in Figure 2, the radio frequency transceiver device 120 includes a modem 210, a radio frequency integrated circuit (RFIC) 220, a radio frequency front-end (RFFE) module 230, and an antenna (ANT) 240; wherein, the modem 210 is coupled to the RFIC 220, the RFIC 220 is coupled to the RFFE module 230, and the RFFE module 230 is coupled to the antenna 240.

[0081] As shown in Figure 3, the RF front-end module 230 may include multiple RF processing devices, such as a power amplifier (PA) 310, a surface acoustic wave (SAW) filter (not shown in Figure 3), a low noise amplifier (LNA) 320, a duplexer 330, and an RF switch 340. The RF transmitting and receiving ends of the transmitting RF chip 220 are coupled to the RF end of the RF switch 340 via one or more RF devices (e.g., a power amplifier, a low noise amplifier, or a SAW filter) for amplifying and / or filtering the RF signal. The antenna 240 is coupled to the antenna end of the RF switch 340. The RF front-end module 230 includes a transmitting port TX1, receiving ports RX1 and RX2, and RF ports RF1 and RF2.

[0082] To enable electronic devices to meet communication requirements in various application scenarios, the aforementioned RF front-end module 230 can include multiple RF channels depending on the operating frequency band. As an example, referring to Figure 4, the RF front-end module 230 may include a first RF channel and a second RF channel. The first RF channel may include a low-noise amplifier 320, an RF switch 340, and other RF processing devices, as well as an antenna 2402. The second RF channel may include a power amplifier 310, a duplexer 330, an RF switch 340, and other RF processing devices, as well as an antenna 2401. The first RF channel is used to transmit signals in the first frequency band F1, and the second RF channel is used to receive signals in the second frequency band F2. The RF front-end module 230 also includes a receive port RX3. It should be noted that the number and frequency bands of the RF front-end module 230 can be adjusted according to actual needs; this embodiment does not limit the specific structure of the RF front-end module 230.

[0083] When there are many RF channels in an RF front-end module, in order to meet the communication performance and structural adaptation requirements of the RF front-end module, the antennas may be placed very close together, thus reducing the isolation between the antennas. In this case, the energy of the transmitting RF channel may couple to adjacent RF channels through the antenna. Adjacent RF channels refer to RF channels whose antenna isolation is less than the isolation threshold, generating interference signals on adjacent RF channels. As an example, if the signal transmitted by RF channel A couples to adjacent RF channel B through the antenna, and its signal strength is greater than the preset maximum interference signal strength, then it can be determined that the isolation between the antennas of RF channel A and RF channel B is less than the isolation threshold.

[0084] If nonlinear devices exist in adjacent RF channels, they will excite harmonics in those devices, which will then radiate with the antenna, degrading the RF performance of the electronic device. Nonlinear devices refer to electronic components with a nonlinear current-voltage relationship. For example, low-noise amplifiers include nonlinear components (e.g., diodes or field-effect transistors).

[0085] As an example, continuing to refer to Figure 4, when the first and second radio frequency channels are adjacent, as shown by the dotted line, the fundamental signal emitted by the second radio frequency channel is coupled to the first radio frequency channel through antenna 2402 and excites the nonlinear device (low-noise amplifier 320). As shown by the dotted line, the low-noise amplifier 320 generates harmonic radiation, and the higher-order harmonics generated after the low-noise amplifier 320 is excited are conducted to antenna 2402, generating antenna radiation.

[0086] Figure 5 illustrates a schematic diagram of an RF front-end module for suppressing inter-antenna interference in related technologies. It includes a first RF channel and a second RF channel, both of which include RF front-end devices. The first RF channel transmits and receives RF signals in a first frequency band, while the second RF channel transmits and receives RF signals in a second frequency band. To prevent the signal received by the first RF channel from interfering with the signal received by the second RF channel, a first path and a second path are provided between the RF front-end and the first RF channel, and these two paths can be switched via a switch. The first path includes a filter circuit and a notch network, while the second path is a straight-through path. When the first and second RF channels do not operate simultaneously, the first RF channel can switch to the second path, i.e., the straight-through path. Since the transmitted RF signal does not have a filter circuit and a notch network, it will not cause power attenuation of the RF signal in the first frequency band. When the first and second RF channels operate simultaneously, the first RF channel is switched to the first path to suppress harmonics generated after the nonlinear devices in the first RF channel are excited, thereby reducing interference to the second RF channel. It should be noted that the RF front-end module may also include more devices, but these are not shown in Figure 5.

[0087] In the above scheme, when the first radio frequency channel transmits signals and the second radio frequency channel receives signals simultaneously, switching the radio frequency channel where the first radio frequency channel is located to the first path equipped with a filter circuit and a notch network can reduce the interference of the first radio frequency channel to the second radio frequency channel. However, this will also cause the power of the transmitted signal of the radio frequency channel where the first radio frequency channel is located to be attenuated, affecting the communication quality. In addition, the addition of switching switches, filter circuits, notch networks and other devices also makes the structure of the scheme complex and increases the cost.

[0088] To address the aforementioned issues, this application provides a radio frequency (RF) front-end module, including a first RF channel and a second RF channel. The first RF channel includes an RF processing device, a filtering circuit, and a first antenna. The RF processing device is coupled to the first antenna via the filtering circuit. The second RF channel includes a second antenna, and the isolation between the first antenna and the second antenna is less than an isolation threshold, meaning the first and second RF channels are adjacent RF channels. Multiple RF processing devices can be used, and the RF processor may include nonlinear devices. The filtering circuit is disposed between the nonlinear devices and the first antenna.

[0089] As an example, referring to Figure 6, the RF front-end module includes a first RF channel and a second RF channel. The first RF channel may include a low-noise amplifier 320, an RF switch 340, and other RF processing devices, as well as an antenna 2402. The low-noise amplifier 320 is a non-linear device. The second RF channel may include a power amplifier 310, a duplexer 330, an RF switch 340, and other RF processing devices, as well as an antenna 2401. A filter circuit 350 is provided between the low-noise amplifier 320 and the antenna 2402. The filter circuit 350 is used to suppress the propagation of interference signals between the antenna 2402 and the low-noise amplifier 320. It should be noted that the RF front-end module also includes an RF chip 220 and a modem (not shown in Figure 6). The RF chip 220 and the modem can be connected in various ways. This embodiment does not limit the specific structure of the RF front-end module.

[0090] The filtering circuit suppresses interference signals propagated between the first antenna and the nonlinear device in two ways. Firstly, when the operating frequency bands of the first and second RF channels do not overlap, it suppresses the fundamental signal propagated from the first antenna to the nonlinear device. The operating frequency band of the first RF channel can be the signal frequency band that matches the receiving frequency band of the first antenna when the first RF channel receives a signal, and the operating frequency band of the second RF channel can be the signal frequency band that matches the transmitting frequency band of the second antenna when the second RF channel transmits a signal. Secondly, when the operating frequency bands of the first and second RF channels overlap, it suppresses harmonics propagated from the nonlinear device to the first antenna.

[0091] In one possible implementation, when the operating frequency bands of the first RF channel and the second RF channel do not overlap, the filtering circuit on the first RF channel may include a first filtering circuit. Referring to Figure 7, a first filtering circuit 351 is provided between the antenna 2402 and the low-noise amplifier 320, as shown by the dotted line. The first filtering circuit 351 can be used to suppress interference signals from being conducted from the antenna 2402 to the low-noise amplifier 320, thereby preventing the low-noise amplifier 320 in the first RF channel from being excited by interference signals emitted by the second RF channel.

[0092] For example, the first filter circuit can be any one of a high-pass filter circuit, a low-pass filter circuit, a band-stop filter circuit, and a band-pass filter circuit. In different application scenarios, the corresponding first filter circuit can be selected according to the correspondence between the frequency bands of the signals transmitted by the first RF channel and the second RF channel.

[0093] When the maximum frequency of the signal transmitted by the second RF channel is less than the minimum frequency of the signal received by the first RF channel, in order to isolate the interference of the low-frequency signal to the high-frequency signal, the first filter circuit on the first RF channel can be configured as any one of a high-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit, thereby preventing the interference signal generated by the RF signal transmitted by the second RF channel from entering the nonlinear device of the first RF channel, and the second RF channel does not need to adjust the transmission power, so it will not affect the normal operation of the second RF channel.

[0094] As an example, the frequency band of the signal transmitted by the second radio frequency channel can be the B40 band, with a frequency range of 2.3GHz to 2.39GHz and a center frequency of 2.35GHz. The frequency band of the signal received by the first radio frequency channel can be the N77 band, with a frequency range of 3.3GHz to 4.2GHz and a center frequency of 3.75GHz. Since the frequency band of the signal transmitted by the second radio frequency channel is smaller than the frequency band of the signal received by the first radio frequency channel, the first filter circuit on the first radio frequency channel can be set as any one of a high-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit.

[0095] When the minimum frequency of the signal transmitted by the second RF channel is greater than the maximum frequency of the signal received by the first RF channel, it means that the second RF channel is processing a higher frequency signal, while the first RF channel is processing a lower frequency signal. To isolate the interference of high-frequency signals on low-frequency signals, the first filter circuit on the first RF channel can be configured as any one of a low-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit.

[0096] As an example, the frequency band of the signal transmitted by the second RF channel can be the B40 band, and the frequency band of the signal received by the first RF channel can be the G1800 band, with a frequency range of 1710MHz to 1880MHz and a center frequency of 1747.4MHz. The frequency band of the signal transmitted by the second RF channel is greater than the frequency band of the signal received by the first RF channel. Therefore, the first filter circuit on the first RF channel can be set as any one of a low-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit.

[0097] When the minimum frequency of the signal transmitted by the second RF channel is greater than the maximum frequency of the lower frequency band of the signal received by the first RF channel, and the maximum frequency of the signal transmitted by the second RF channel is less than the minimum frequency of the higher frequency band of the signal received by the first RF channel, and there are no overlapping frequency bands, the first filter circuit on the first RF channel can be configured as either a band-pass filter circuit or a band-stop filter circuit.

[0098] As an example, referring to Figure 8, the frequency band of the signal transmitted by the second radio frequency channel can be the B40 band, with a frequency range of 2.3GHz to 2.39GHz and a center frequency of 2.35GHz. The frequency band of the signal received by the first radio frequency channel can include the G1800 band and the N77 band. The frequency range of the G1800 band is 1710MHz to 1880MHz, and the frequency range of the N77 band is 3.3GHz to 4.2GHz with a center frequency of 3.75GHz. The frequency band of the signal transmitted by the second radio frequency channel does not overlap with the frequency band of the signal received by the first radio frequency channel.

[0099] The frequency band of the signal transmitted by the second radio frequency channel is located between the frequency bands of the signal received by the first radio frequency channel. Therefore, the first filter circuit on the first radio frequency channel can be set as either a band-pass filter circuit or a band-stop filter circuit.

[0100] If multiple adjacent radio frequency channels of the first radio frequency channel interfere with the first radio frequency channel, and the frequency bands of the signals transmitted by the multiple adjacent radio frequency channels do not overlap with the frequency bands of the signals received by the first radio frequency channel, then multiple filtering circuits can be set on the first radio frequency channel, with each filtering circuit used to filter out the interference generated by an adjacent radio frequency channel.

[0101] The specific number and combination of the first filter circuit can be set according to actual needs. High-pass filter circuit, low-pass filter circuit, band-stop filter circuit and band-pass filter circuit can all be implemented in various ways. This embodiment does not limit them.

[0102] As an example, referring to the first filter circuit 351 shown in Figure 9, the first filter circuit 351 can be a notch filter circuit. The first terminal of the notch filter circuit is coupled to the nonlinear device, and the second terminal of the notch filter circuit is coupled to the antenna. The notch filter circuit includes a first terminal, a second terminal, a first capacitor C1, and a first inductor L1. Both the first and second terminals of the notch filter circuit are coupled to the first terminal of the first capacitor C1, and the second terminal of the first capacitor C1 is coupled to the first terminal of the first inductor L1. The second terminal of the first inductor L1 is grounded to GND.

[0103] As an example, referring to the first filter circuit 351 shown in Figure 10, the first filter circuit 351 can also be a low-pass filter circuit. The low-pass filter circuit includes a first terminal, a second terminal, a second capacitor C2, a second inductor L2, and a third inductor L3. The first terminal of the low-pass filter circuit is coupled to a nonlinear device, and the second terminal is coupled to an antenna. The low-pass filter circuit includes a second capacitor C2, a second inductor L2, and a third inductor L3. The first terminal of the second capacitor C2 is coupled to the first terminal of the second inductor L2, serving as the first terminal of the low-pass filter circuit, and the second terminal of the second capacitor C2 is grounded to GND. The second terminal of the second inductor L2 is coupled to the first terminal of the third inductor L3, serving as the second terminal of the low-pass filter circuit, and the second terminal of the third inductor L3 is grounded to GND.

[0104] The RF front-end module provided in this application embodiment can prevent the nonlinear devices in the first RF channel from being excited without changing the transmission power of the second RF channel when the frequency band of the signal received by the first RF channel does not overlap with the frequency band of the signal transmitted by the second RF channel. This reduces the radiation of the RF front-end module. Furthermore, the structure of the first filter circuit is simple, which greatly reduces the overall circuit implementation cost.

[0105] The foregoing example illustrates the case where the operating frequency bands of the first RF channel and the second RF channel do not overlap. In another possible implementation, when the operating frequency bands of the first RF channel and the second RF channel overlap, the filtering circuit may include a second filtering circuit. The second filtering circuit can be used to suppress harmonics transmitted from nonlinear devices to the antenna in the first RF channel.

[0106] As an example, referring to Figure 11, a second filter circuit 352 is provided between the antenna 2402 and the low-noise amplifier 320, as shown by the dashed line. The second filter circuit 352 can be used to suppress harmonics from the low-noise amplifier 320 to the antenna 2402.

[0107] It should be noted that the overlap between the operating frequency band of the first radio frequency channel and the operating frequency band of the second radio frequency channel can include both partial overlap and complete coverage.

[0108] As an example, when the maximum frequency of the signal transmitted by the second RF channel is less than the maximum frequency of the signal received by the first RF channel, but greater than the minimum frequency of the signal received by the first RF channel, and the minimum frequency of the signal transmitted by the second RF channel is less than the minimum frequency of the signal received by the first RF channel, the operating frequency bands of the first and second RF channels partially overlap.

[0109] When the maximum frequency of the signal transmitted by the second RF channel is less than the maximum frequency of the signal received by the first RF channel, and the minimum frequency of the signal transmitted by the second RF channel is greater than the minimum frequency of the signal received by the first RF channel, the operating frequency band of the second RF channel is completely covered by the operating frequency band of the first RF channel.

[0110] When setting the second filter circuit, it can be set according to the relative relationship between the frequency band of the signal received by the first radio frequency channel and the frequency band of the harmonics generated after the nonlinear device in the first radio frequency channel is excited. In one feasible implementation, the second filter circuit can be any one of a high-pass filter circuit, a low-pass filter circuit, a band-stop filter circuit, and a band-pass filter circuit.

[0111] When the maximum frequency of the harmonics generated by the nonlinear device in the first RF channel after being excited is less than the minimum frequency of the signal received by the first RF channel, the second filter circuit on the first RF channel can be configured as a high-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit to isolate the interference of low-frequency signals to high-frequency signals. This prevents the harmonics generated by the nonlinear device in the first RF channel after being excited by interference signals from radiating through the antenna of the first RF channel without affecting the normal operation of the first RF channel.

[0112] When the minimum frequency of the harmonic band generated by the nonlinear device in the first radio frequency channel after being excited is greater than the maximum frequency of the signal band received by the first radio frequency channel, in order to isolate the interference of low-frequency signals to high-frequency signals, the second filter circuit on the first radio frequency channel can be configured as any one of a low-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit, thereby preventing the harmonics generated by the nonlinear device in the first radio frequency channel after being excited by the interference signal from being radiated through the antenna of the first radio frequency channel.

[0113] When the maximum frequency of the harmonic band generated by the nonlinear device in the first RF channel after being excited is less than the maximum frequency of the signal band received by the first RF channel, and when the minimum frequency of the harmonic band generated by the nonlinear device in the first RF channel after being excited is greater than the minimum frequency of the signal band received by the first RF channel, in order to isolate the interference of low-frequency signals to high-frequency signals, the second filter circuit on the first RF channel can be configured as either a band-pass filter circuit or a band-stop filter circuit, thereby preventing the harmonics generated by the nonlinear device in the first RF channel after being excited by the interference signal from being radiated through the antenna of the first RF channel.

[0114] As an example, referring to Figure 12, the frequency band of the signal transmitted by the second RF channel can be the B42 band, with a frequency range of 3.4 GHz to 3.6 GHz and a center frequency of 3.5 GHz. The frequency band of the signal received by the first RF channel can be the N77 band, with a frequency range of 3.3 GHz to 4.2 GHz and a center frequency of 3.74 GHz. That is, the frequency bands of the signals transmitted by the second RF channel and the signals received by the first RF channel overlap. The second harmonic generated by the nonlinear device in the first RF channel after being excited by the interference signal has a frequency band of 6.8 GHz to 7.2 GHz. The minimum frequency of the second harmonic band (6.8 GHz) is greater than the maximum frequency of the signal band received by the first RF channel (4.2 GHz). Therefore, the second filter circuit on the first RF channel can be set as any one of a low-pass filter circuit, a band-pass filter circuit, or a band-stop filter circuit.

[0115] If signals emitted by multiple adjacent RF channels interfere with the first RF channel, and the frequency bands of the signals emitted by the multiple adjacent RF channels overlap with the frequency bands of the signals received by the first RF channel, then the impact of the signals emitted by the adjacent RF channels on the first RF channel can be reduced by setting a corresponding second filter circuit for each adjacent RF channel. Alternatively, a corresponding second filter circuit can be set for each harmonic.

[0116] It should be noted that the implementation of the second filter circuit can be the same as that of the first filter circuit, so the embodiments of this application will not be described in detail.

[0117] The RF front-end module provided in this application reduces the radiation of the entire RF front-end module by suppressing the propagation of harmonics in the RF channel and preventing harmonics from radiating through the antenna when the frequency band of the signal transmitted by the RF channel does not overlap with the frequency band of the signal transmitted by the adjacent RF channel.

[0118] In any radio frequency (RF) channel, a portion of the frequency band of the RF signal processed may overlap with the frequency band of the signal transmitted by an adjacent RF channel, while another portion may not overlap. Therefore, to achieve better suppression, interference signals and harmonics can be suppressed simultaneously during propagation in the RF channel.

[0119] In one feasible implementation, referring to FIG13, a second filter circuit 352 and a first filter circuit 351 are provided between the antenna 2402 and the low noise amplifier 320, as shown by the dotted line. The first filter circuit 351 can be used to suppress interference signals from the antenna 2402 to the low noise amplifier 320, as shown by the dotted line. The second filter circuit 352 can be used to suppress harmonics from the low noise amplifier 320 to the antenna 2402.

[0120] When the first filter circuit and the second filter circuit are set up simultaneously, the number and combination of the first filter circuit and the second filter circuit can be set according to actual needs, and the embodiments of this application do not limit this.

[0121] In the above embodiments, the radiation of the radio frequency front-end module is reduced by suppressing the propagation process of interference signals and harmonics in the radio frequency channel. In order to achieve a better reduction in radiation, the self-radiation of nonlinear devices can also be suppressed.

[0122] In one feasible implementation, as shown in FIG14, the RF front-end module provided in this application embodiment may further include a shielding cover, and the nonlinear device (low-noise amplifier 320) in the first RF channel may be partially or entirely disposed within the shielding cover. This can shield the harmonic radiation generated on the nonlinear device and improve the radiated spurious problem of the electronic device.

[0123] Figure 15 shows a schematic diagram of a general-purpose radio frequency (RF) switch. As shown in Figure 15, the RF switch 340 includes a first transistor 341 and a second transistor 342. The first terminal of the first transistor 341 is coupled to the first RF terminal RF1 of the RF switch 340, and the first terminal of the second transistor 342 is coupled to the second RF terminal RF2 of the RF switch 340. The second terminals of both the first transistor 341 and the second transistor 342 are coupled to the antenna terminal ANT of the RF switch 340. Taking a transmission scenario as an example, the RF switch 340 can selectively activate the first RF terminal RF1 and the antenna terminal ANT to transmit and receive a first RF signal, or selectively activate the second RF terminal RF2 and the antenna terminal ANT to transmit and receive a second RF signal.

[0124] For example, the RF switch 340 can transmit and receive a first RF signal by controlling the first transistor 341 to turn on and the second transistor 342 to turn off, thereby connecting the first RF terminal RF1 and the antenna terminal ANT. The path for transmitting and receiving the first RF signal through the first RF terminal RF1 can be called the first path. However, due to the parasitic capacitance on the second transistor 342, the characteristic of capacitance to block DC and pass AC results in poor isolation of the RF signal by the RF switch 340. Therefore, when transmitting the first RF signal through the first path, the first RF signal can leak to the second RF terminal RF2 of the RF switch 340 through the parasitic capacitance of the second transistor 342. Similarly, the RF switch 340 can transmit and receive a second RF signal by controlling the second transistor 342 to turn on and the first transistor 341 to turn off, thereby connecting the second RF terminal RF2 and the antenna terminal ANT. The path for transmitting and receiving the second RF signal through the second RF terminal RF2 can be called the second path. However, due to the parasitic capacitance on the first transistor 341, when the second radio frequency signal is transmitted through the second path, the second radio frequency signal can leak to the first radio frequency terminal RF1 of the radio frequency switch 340 through the parasitic capacitance of the first transistor 341.

[0125] As shown in Figure 16, in some examples, when the first path transmits the first radio frequency (RF) signal, due to the poor isolation of the RF switch 340, the leaked RF signal will be transmitted to the second path. Since the components of the first RF processing device in the RF front-end module 230 include nonlinear elements, these first RF processing devices can be called nonlinear devices. For example, the components of the low-noise amplifier 320B on the second path include nonlinear elements such as diodes or field-effect transistors. The low-noise amplifier 320B is a nonlinear device, where a nonlinear element refers to a component (or material) that does not apply to Ohm's law; that is, a component (or material) whose current through a device is not proportional to the voltage applied across the device can be called a nonlinear element (or material). When the leaked RF signal is applied to the low-noise amplifier 320B (nonlinear device) on the second path, the leaked RF signal will excite the nonlinear device, resulting in waveform distortion. The distorted RF signal can be decomposed into the first RF signal (i.e., the fundamental frequency) and the harmonics of the first RF signal, where the frequency of the harmonics is higher than the frequency of the first RF signal. On the one hand, harmonics can generate harmonic radiation on nonlinear devices. On the other hand, harmonics may also be transmitted to antenna 240, generating harmonic radiation on antenna 240. The harmonic radiation is not within the expected operating frequency range of RF transceiver 120, which can easily lead to spurious radiation problems in RF transceiver 120.

[0126] To improve the radiated spurious emissions problem caused by poor isolation of the RF switch, the RF front-end module provided in this application further includes a filtering circuit. The first RF processing device (i.e., a nonlinear device) in the RF processing device is coupled to the second RF terminal through the filtering circuit. The filtering circuit can suppress the transmission of signals in a specific frequency band. Suppressing the transmission of signals in a specific frequency band means that the signal strength (e.g., amplitude, power) of the specific frequency band signal will be greatly attenuated after passing through the filtering circuit, thus weakening or even filtering out the specific frequency band signal. In the case of leakage of the first RF signal to the second RF terminal, the filtering circuit is used to suppress the transmission of the first RF signal to the first RF processing device, thereby reducing the generation of harmonics. Alternatively, in the case of leakage of the first RF signal to the first RF processing device, causing distortion of the first RF signal and generating harmonics, the filtering circuit is used to suppress the harmonics of the first RF signal transmitted from the first RF processing device to the second RF terminal. This improves the radiated spurious emissions problem of the RF transceiver. As mentioned above, the nonlinear device includes devices with nonlinear elements in its structure; for example, the power amplifier, low-noise amplifier, or surface acoustic wave filter in the RF front-end module are all nonlinear devices.

[0127] As shown in Figure 17, the low-noise amplifier 320A (nonlinear device) and power amplifier 310 on the first path can be coupled to the first terminal of the corresponding filter circuit 350 via a duplexer 330. The second terminal of the filter circuit 350 is coupled to the first RF terminal RF1 of the RF switch 340. Another low-noise amplifier 320B (nonlinear device) on the second path can be directly coupled to the first terminal of another corresponding filter circuit 350. The second terminal of the filter circuit 350 is coupled to the second RF terminal RF2 of the RF switch 340.

[0128] The leakage of radio frequency (RF) signals from RF switch 340 to nonlinear devices can excite these devices and generate harmonics. This embodiment illustrates an example where the first RF signal leaks into the transmission path of the second RF signal. As shown in Figure 18, in some implementations, the frequency band (also called the frequency range) of the first RF signal does not overlap with that of the second RF signal. Filter circuit 350 may include a first filter circuit 351. The low-noise amplifier 320B (nonlinear device) on the second path is coupled to the first terminal of the corresponding first filter circuit 351, and the second terminal of the first filter circuit 351 is coupled to the second RF terminal RF2 of RF switch 340. In the case of leakage of the first RF signal to the second RF terminal RF2, the first filter circuit 351 on the second path (i.e., coupled to the second RF terminal RF2 of RF switch 340) can suppress the leakage of the first RF signal to the low-noise amplifier 320. In other words, for the first filter circuit 351 on the second path, the second terminal of the first filter circuit 351 (i.e., the terminal connected to the second RF terminal RF2) can detect the leaked first RF signal, while the signal strength of the first RF signal at the first terminal of the first filter circuit 351 (i.e., the terminal connected to the low-noise amplifier 320B) is reduced, and the leaked first RF signal may not even be detected. This effectively reduces the harmonics generated by the leaked first RF signal exciting the low-noise amplifier 320B, thereby reducing the harmonic transmission of the first RF signal to the antenna 240, reducing harmonic radiation, and improving the radiated spurious problem of the RF transceiver 120.

[0129] In some embodiments, the first filter circuit 351 may be a band-stop filter circuit. For example, the stopband of the band-stop filter circuit on the second path includes the frequency band of the first radio frequency signal but not the frequency band of the second radio frequency signal. That is, the band-stop filter circuit on the second path only suppresses the transmission of the first radio frequency signal leaking to the second radio frequency terminal RF2 to the low-noise amplifier 320B on the second path, without affecting the transmission of the second radio frequency signal between the second radio frequency terminal RF2 and the low-noise amplifier 320B on the second path, ensuring that the second radio frequency signal can be transmitted and received through the second radio frequency terminal RF2.

[0130] It should be understood that when the first filter circuit 351 on the first path (i.e., coupled to the first RF terminal RF1 of the RF switch 340) is a band-stop filter circuit, the stopband of the band-stop filter circuit includes the frequency band of the second RF signal but does not include the frequency band of the first RF signal. That is, the band-stop filter circuit only suppresses the transmission of the second RF signal leaking to the first RF terminal RF1 to the low-noise amplifier 320A on the first path, without affecting the transmission of the first RF signal between the first RF terminal RF1 and the low-noise amplifier 320A on the first path, ensuring that the first RF signal can be transmitted and received through the first RF terminal RF1.

[0131] Specifically, the band-stop filter circuit can be shown in Figure 9, so it will not be described in detail here.

[0132] In other embodiments, the first filter circuit 351 may also be a bandpass filter circuit. For example, the passband of the bandpass filter circuit on the second path includes the frequency band of the second radio frequency signal but excludes the frequency band of the first radio frequency signal. That is, the bandpass filter on the second path only allows the second radio frequency signal to transmit between the second radio frequency terminal RF2 and the low-noise amplifier 320B on the second path, while suppressing the first radio frequency signal leaking to the second radio frequency terminal RF2 from transmitting to the low-noise amplifier 320B on the second path.

[0133] It should be understood that in other embodiments, the first filter circuit 351 may also employ other forms of filter circuits, which are not limited here in the embodiments of this application. As an example, the first path is used to transmit and receive a first radio frequency signal in the B40 band; wherein, the B40 band ranges from 2.3 GHz to 2.39 GHz, and the center frequency is 2.35 GHz. The second path is used to receive a second radio frequency signal in the N77 band; wherein, the N77 band ranges from 3.3 GHz to 4.2 GHz, and the center frequency is 3.75 GHz. The frequency band of the first radio frequency signal is lower than that of the second radio frequency signal. Therefore, the first filter circuit 351 on the second path can be a high-pass filter circuit, which allows the higher frequency second radio frequency signal to pass through. When the first radio frequency signal leaks to the second radio frequency terminal RF2 of the radio frequency switch 340, the high-pass filter circuit can suppress the lower frequency first radio frequency signal from passing through, thereby suppressing the transmission of the leaked first radio frequency signal to the low-noise amplifier 320B on the second path. Conversely, the first filter circuit 351 on the first path can be a low-pass filter circuit, which allows the lower frequency first radio frequency signal to pass through. When the second radio frequency signal leaks to the first radio frequency terminal RF1 of the radio frequency switch 340, the low-pass filter circuit can suppress the passage of the higher frequency second radio frequency signal, thereby suppressing the transmission of the leaked second radio frequency signal to the low noise amplifier 320A on the first path.

[0134] In some examples, the frequency bands of the first radio frequency (RF) signal transmitted and received on the first path and the second RF signal on the second path may overlap. If a first filter circuit 351 for filtering the first RF signal is provided on the second path, although the first filter circuit 351 can suppress the transmission of the leaked first RF signal to the nonlinear device on the second path, it will also suppress the transmission of the second RF signal between the nonlinear device and the second RF terminal RF2, affecting the transmission and reception of the second RF signal on the second path. Therefore, as shown in FIG19, in some embodiments, the filter circuit 350 includes a second filter circuit 352. The low-noise amplifier 320B (nonlinear device) on the second path is coupled to the first terminal of the corresponding second filter circuit 352, and the second terminal of the second filter circuit 352 is coupled to the second RF terminal RF2 of the RF switch 340. When the first RF signal leaking to the second RF terminal RF2 is transmitted to the low-noise amplifier 320B coupled to the second RF terminal RF2, harmonics of the first RF signal will be generated. The second filter circuit 352 on the second path (i.e., coupled to the second RF terminal RF2 of the RF switch 340) is used to suppress harmonics of the first RF signal transmitted from the low-noise amplifier 320B to the second RF terminal RF2. In other words, the leaked first RF signal can be detected at both ends of the second filter circuit 352 on the second path. The end of the second filter circuit 352 connected to the low-noise amplifier 320B can detect harmonics of the first RF signal, while the end of the second filter circuit 352 connected to the second RF terminal RF2 has reduced signal strength of the harmonics of the first RF signal, or even makes them undetectable. This reduces or even eliminates the transmission of harmonics of the first RF signal to the antenna 240, thereby reducing harmonic radiation on the antenna 240 and improving the radiated spurious emissions problem of the RF transceiver 120.

[0135] For example, since the frequency of the Nth harmonic of the first radio frequency signal is N times the frequency of the first radio frequency signal, when the frequency band of the first radio frequency signal coincides with the frequency band of the second radio frequency signal, the frequency of the harmonic of the first radio frequency signal is usually greater than the frequency of the second radio frequency signal; that is, the frequency band of the harmonic of the first radio frequency signal does not coincide with the frequency band of the second radio frequency signal. Therefore, in some embodiments, the second filter circuit 352 can be a low-pass filter circuit. For example, the low-pass filter circuit on the second path can effectively suppress the transmission of the first radio frequency signal harmonic (higher frequency) to the second radio frequency terminal RF2 by the low-noise amplifier 320B, while also ensuring that the second radio frequency signal (lower frequency) can be transmitted between the second radio frequency terminal RF2 and the low-noise amplifier 320B on the second path.

[0136] Specifically, the low-pass filter circuit can be shown in Figure 10, so it will not be described in detail here.

[0137] It should be understood that in other embodiments, the second filter circuit 352 may also adopt other forms of filter circuits; for example, bandpass filter circuits or bandstop filter circuits, etc., which are not limited here in the embodiments of this application.

[0138] In some embodiments, two filter circuits 350 can be provided, namely a first filter circuit 351 and a second filter circuit 352. As shown in FIG20, on the second path, the low-noise amplifier 320B is coupled to the second RF terminal RF2 in sequence through the first filter circuit 351 and the second filter circuit 352. Firstly, the first filter circuit 351 suppresses the transmission of the first RF signal leaking to the second RF terminal RF2 to the low-noise amplifier 320B on the second path, reducing the generation of harmonics in the first RF signal. Secondly, the second filter circuit 352 suppresses the harmonics of the first RF signal transmitted from the low-noise amplifier 320B on the second path to the second RF terminal RF2. This significantly reduces harmonic radiation generated on the antenna 240, effectively improving the radiated spurious emission problem of the RF transceiver 120.

[0139] Furthermore, although not shown in this application, those skilled in the art should understand that any RF terminal of the RF switch 340 may receive RF signals leaked from multiple other RF terminals (the frequency bands of the multiple leaked RF signals may be different). Therefore, multiple filter circuits can be provided between any RF terminal of the RF switch 340 and the corresponding coupled nonlinear device. These multiple filter circuits can be multiple first filter circuits 351, multiple second filter circuits 352, or any combination of multiple first filter circuits 351 and multiple second filter circuits 352.

[0140] Furthermore, as shown in Figure 21, the radio frequency front-end provided in this embodiment may also include a shielding cover 360, with some or all of the nonlinear devices disposed within the shielding cover 360. This can shield the harmonic radiation generated on the nonlinear devices, thereby reducing the interference of harmonic radiation on other devices inside the electronic device 100 and further improving the radiated spurious problem of the radio frequency transceiver 120.

[0141] As shown in Figure 22, in some embodiments, the RF front end further includes multiple grounding circuits 370, and the RF terminal of the RF switch 340 is coupled to each of the multiple grounding circuits 370 in a one-to-one correspondence. Specifically, the grounding circuit 370 includes a grounding transistor, the first terminal of which is coupled to the RF terminal of the RF switch 340, and the second terminal of which is grounded to GND. It should be understood that in other embodiments, the grounding transistor may also be integrated into the RF switch 340.

[0142] As shown in Figure 23, in some examples, when the first path transmits the first radio frequency signal through the first radio frequency terminal RF1 of the radio frequency switch 340, if the isolation of the radio frequency switch 340 is poor, the first radio frequency signal will leak to the second radio frequency terminal RF2 of the radio frequency switch 340. When the first path transmits the first radio frequency signal through the first radio frequency terminal RF1 of the radio frequency switch 340, and the second path does not receive the radio frequency signal, the embodiments of this application can transmit the leaked first radio frequency signal to ground GND by turning on the ground transistor coupled to the second radio frequency terminal RF2 of the radio frequency switch 340, thereby also suppressing the transmission of the leaked first radio frequency signal to the low noise amplifier 320B on the second path. Similarly, in other examples, when the second path transmits the second radio frequency signal through the second radio frequency terminal RF2 of the radio frequency switch 340, and the first path does not transmit or receive radio frequency signals, the embodiments of this application can transmit the leaked second radio frequency signal to ground GND by turning on the grounding transistor coupled to the first radio frequency terminal RF1 of the radio frequency switch 340, thereby also suppressing the transmission of the leaked second radio frequency signal to the low noise amplifier 320A on the first path.

[0143] In other words, the embodiments of this application can transmit the leaked radio frequency signal to ground GND through the grounding transistor, thereby preventing the leaked radio frequency signal from being transmitted to the nonlinear device, avoiding the harmonics generated by the nonlinear device due to the leaked radio frequency signal, thereby reducing harmonic radiation and improving the radiation spurious problem of the radio frequency transceiver 120.

[0144] This application also provides an electronic device 100, which includes a processor 110 and a radio frequency transceiver 120. The radio frequency front-end module 230 in the radio frequency transceiver 120 is a solution from any one of the various embodiments provided in this application, or a combination of several embodiments.

[0145] It should be understood that in the embodiments of this application, some or all of the components of the radio frequency front-end module may be integrated as a whole; or, the various components of the radio frequency front-end module may be set separately, and this application does not impose any restrictions on this.

[0146] In the embodiments provided in this application, it should be understood that the disclosed RF front-end module, RF transceiver, and electronic device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces; the indirect coupling or communication connection between devices or modules may be electrical, mechanical, or other forms.

[0147] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A radio frequency front-end module, characterized in that, include: A first radio frequency channel, the first radio frequency channel including a radio frequency processing device, a filter circuit and a shield, the radio frequency processing device being electrically connected to the filter circuit, the filter circuit being configured to be electrically connected to a first antenna, the radio frequency processing device being a non-linear device, and the radio frequency processing device being disposed inside the shield; A second radio frequency channel, configured to be electrically connected to a second radio frequency channel; The filtering circuit includes a first filtering circuit and a second filtering circuit. The radio frequency processing device is electrically connected to the first filtering circuit, the first filtering circuit is electrically connected to the second filtering circuit, and the second filtering circuit is configured to be electrically connected to the first antenna. The first filtering circuit is used to suppress the transmission of the signal transmitted by the second antenna to the radio frequency processing device when the first antenna receives the signal transmitted by the second antenna. The second filtering circuit is used to suppress the transmission of harmonics from the radio frequency processing device to the first antenna when the signal transmitted by the second antenna is transmitted to the radio frequency processing device and the signal transmitted by the second antenna is distorted and generates harmonics.

2. The radio frequency front-end module of claim 1, wherein, The isolation between the first antenna and the second antenna is less than the isolation threshold.

3. The radio frequency front-end module of claim 1, wherein, The operating frequency band of the first radio frequency channel does not overlap with the operating frequency band of the second radio frequency channel.

4. The radio frequency front-end module of claim 3, wherein, The operating frequency bands of the first radio frequency channel and the second radio frequency channel do not overlap, including: The maximum frequency of the signal transmitted by the second radio frequency channel is less than the minimum frequency of the signal received by the first radio frequency channel. Alternatively, the minimum frequency of the signal transmitted by the second radio frequency channel is greater than the maximum frequency of the signal received by the first radio frequency channel.

5. The radio frequency front end module of claim 1, wherein, The operating frequency band of the first radio frequency channel overlaps with that of the second radio frequency channel.

6. The radio frequency front-end module of claim 1, wherein, The operating frequency bands of the first radio frequency channel and the second radio frequency channel overlap in the following aspects: The operating frequency band of the first radio frequency channel partially overlaps with that of the second radio frequency channel. Alternatively, the operating frequency bands of the first RF channel and the second RF channel may have a complete coverage relationship.

7. A radio frequency front-end module, characterized in that, This includes RF switches, RF processing devices, filtering circuits, and shielding; among which, The radio frequency switch includes a first radio frequency terminal, a second radio frequency terminal, and an antenna terminal. The first radio frequency terminal and the second radio frequency terminal are respectively coupled to the corresponding radio frequency processing device, and the antenna terminal is used to couple an antenna. The radio frequency switch is configured to: control the transmission of a first radio frequency signal between the first radio frequency terminal and the antenna terminal; or, control the transmission of a second radio frequency signal between the second radio frequency terminal and the antenna terminal. The first radio frequency processing device in the radio frequency processing device is coupled to the second radio frequency terminal through the filtering circuit. The first radio frequency processing device is a nonlinear device and is disposed inside the shielding cover. The filtering circuit includes a first filtering circuit and a second filtering circuit. The first radio frequency processing device is coupled to the second radio frequency terminal through the first filtering circuit and the second filtering circuit. The first filtering circuit is used to suppress the transmission of the first radio frequency signal to the first radio frequency processing device when the first radio frequency signal is transmitted to the second radio frequency terminal; The second filtering circuit is used to suppress the harmonics of the first radio frequency signal transmitted from the first radio frequency processing device to the second radio frequency terminal when the first radio frequency signal is transmitted to the first radio frequency processing device and the first radio frequency signal is distorted to generate harmonics.

8. The radio frequency front-end module of claim 7, wherein, The frequency band of the first radio frequency signal does not overlap with the frequency band of the second radio frequency signal.

9. The radio frequency front end module of claim 7, wherein, The frequency band of the harmonics of the first radio frequency signal does not overlap with the frequency band of the second radio frequency signal.

10. The radio frequency front-end module of any one of claims 7-9, wherein the first and second filters are implemented as a single filter. It also includes a grounding circuit, which is coupled to the second radio frequency terminal.

11. The radio frequency front end module of claim 10, wherein, The grounding circuit is configured to transmit the first radio frequency signal to ground by grounding the second radio frequency terminal when the first radio frequency signal is transmitted to the second radio frequency terminal.

12. A radio frequency transceiver apparatus, characterized by It includes a modem, a radio frequency chip, an antenna, and a radio frequency front-end module as described in any one of claims 1-6 or 7-11; wherein the modem is connected to the antenna in sequence through the radio frequency chip and the radio frequency front-end module.

13. An electronic device, comprising: It includes a processor and the radio frequency transceiver device as described in claim 12, wherein the processor is coupled to the radio frequency transceiver device.

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