A radio frequency front-end module and electronic device

Abstract

This application provides a radio frequency (RF) front-end module and electronic device. The RF front-end module includes: an RF power amplifier, a coupler, a filter, a switch, a first input / output terminal, a second input / output terminal, and an antenna terminal. The RF power amplifier includes a transmitting terminal, and the coupler includes a power detection terminal and a receiving terminal. The switch includes a frequency band selection terminal, and the antenna terminal is electrically connected to the output terminal of the switch. The first input / output terminal is used to receive the operating status signal of an external network; the second input / output terminal is used to output the operating status signal of the RF front-end module. By integrating the RF power amplifier, coupler, filter, and switch into a single RF front-end module, the UHF wireless RFID product is optimized, making it simpler and more efficient, and reducing the footprint of the components. The introduction of the first and second input / output terminals reduces the interference between the UHF wireless RFID product and the cellular network when they operate simultaneously.

Description

Technical Field

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

[0002] For the radio frequency front-end circuits of Ultra High Frequency Radio Frequency Identification (UHF RFID) products, existing technologies use discrete components to perform the RFID function. However, for electronic devices with multiple communication systems, the functional requirements are higher due to the need to consider various scenarios. The discrete component approach is limited because each component operates independently, performing its own function without status indication or inter-component management.

[0003] On the other hand, with the further popularization of UHF RFID products, they are increasingly being used in electronic devices with existing communication systems. Cellular networks, as an existing communication system, have penetrated into all aspects of people's lives and work, especially mobile terminal products. When UHF RFID products are used in electronic devices with existing communication systems, the coexistence between UHF RFID products and other communication systems needs to be carefully considered. From a spectrum perspective, the communication systems that share the same or similar frequency range with UHF RFID products are mainly cellular networks. Traditional cellular networks can be divided into low-frequency, mid-frequency, and high-frequency ranges. The low-frequency range is 617MHz to 960MHz, while UHF RFID products generally use two frequency ranges: 865MHz to 868MHz and 902MHz to 928MHz. The operating frequency of UHF RFID products happens to fall within the low-frequency range of cellular networks. This can cause interference between the two when they work simultaneously, and may even directly lead to the interruption of communication for one of them. Therefore, it is crucial to solve the coexistence problem between UHF RFID products and cellular networks and reduce their impact. Summary of the Invention

[0004] This application provides a radio frequency front-end module and electronic device to optimize UHF RFID products and reduce the interference between UHF RFID products and cellular networks when they operate simultaneously. The specific technical solution is as follows:

[0005] In a first aspect, this application provides a radio frequency (RF) front-end module, which includes: an RF power amplifier, a coupler, a filter, a switch, a first input / output terminal, a second input / output terminal, and an antenna terminal; the RF power amplifier includes a transmitting terminal, the coupler includes a power detection terminal and a receiving terminal; the switch includes a frequency band selection terminal, and the antenna terminal is electrically connected to the output terminal of the switch;

[0006] The first input / output terminal is used to receive the operating status signal from the external network;

[0007] The second input / output terminal is used to output the operating status signal of the radio frequency front-end module;

[0008] The power detection terminal is used to detect the transmission power;

[0009] The radio frequency power amplifier is used to receive the first transmission signal connected to the transmitter, amplify the first transmission signal to obtain a second transmission signal, and transmit the second transmission signal to the coupler;

[0010] The coupler is used to couple the second transmitted signal to the filter;

[0011] The filter is used to filter the second transmitted signal to obtain a third transmitted signal, and transmit the third transmitted signal to the switch;

[0012] The switch is used to select a frequency band path according to the frequency band selection signal accessed by the frequency band selection terminal, and to transmit the third transmission signal to the antenna terminal;

[0013] The antenna end is connected to the first external antenna and is used to transmit the third transmission signal; it is also used to receive the first reception signal and transmit the first reception signal to the switch;

[0014] The switch is also used to select a frequency band path according to the frequency band selection signal accessed by the frequency band selection terminal, and to transmit the first received signal to the filter;

[0015] The filter is further configured to filter the first received signal to obtain a second received signal, and transmit the second received signal to the coupler;

[0016] The coupler is also used to couple the second received signal to the receiving end.

[0017] In one possible design, where the filter is a dual-channel surface acoustic wave filter, the switch is a single-pole double-throw switch.

[0018] In one possible design, where the filter is a single-channel surface acoustic wave filter, the RF front-end module includes: an RF power amplifier, a coupler, a filter, a first input / output terminal, a second input / output terminal, and an antenna terminal; the RF power amplifier includes a transmitting terminal, the coupler includes a power detection terminal and a receiving terminal, and the output terminal of the filter is electrically connected to the antenna terminal.

[0019] In one possible design, the filter is a dual-channel surface acoustic wave (SAW) filter, wherein one channel of the SAW filter has a passband of 865MHz to 868MHz and a center frequency of 866MHz, and the other channel of the SAW filter has a passband of 902MHz to 928MHz and a center frequency of 915MHz.

[0020] In one possible design, the center frequency of the single-channel surface acoustic wave filter is 866MHz or 915MHz.

[0021] In one possible design, the surface acoustic wave filter has an insertion loss of no more than 2dB, a maximum standing wave ratio of no more than 2dB, a mid-to-high frequency suppression of more than 30dB, and a low-frequency suppression of more than 30dB at 700MHz.

[0022] In one possible design, the RF front-end module further includes a power supply.

[0023] Secondly, this application provides an electronic device, which includes: a radio frequency front-end module, and further includes: a system-on-a-chip, a transceiver, and a cellular network device;

[0024] The frequency band selection terminal is electrically connected to the first terminal of the system-on-a-chip, the first input / output terminal is electrically connected to the second terminal of the system-on-a-chip, and the second input / output terminal is electrically connected to the third terminal of the system-on-a-chip.

[0025] The transmitting end is electrically connected to the first end of the transceiver, the power detection end is electrically connected to the second end of the transceiver, and the receiving end is electrically connected to the third end of the transceiver.

[0026] The cellular network device is electrically connected to the transceiver.

[0027] In one possible design, the cellular network device includes: a low-frequency module and a mid-to-high-frequency module, a combiner, and a second external antenna;

[0028] The first terminal of the low-frequency module is electrically connected to the fourth terminal of the transceiver, and the second terminal of the low-frequency module is electrically connected to the fifth terminal of the transceiver.

[0029] The first terminal of the medium-high frequency module is electrically connected to the sixth terminal of the transceiver, and the second terminal of the medium-high frequency module is electrically connected to the seventh terminal of the transceiver.

[0030] The first end of the combiner is electrically connected to the third end of the low-frequency module, the second end of the combiner is electrically connected to the third end of the mid-high frequency module, and the output end of the combiner is electrically connected to the second external antenna.

[0031] In one possible design, the passband of the low-frequency module is 500MHz to 960MHz, and the passband of the mid-to-high frequency module is 1427MHz to 2690MHz.

[0032] The beneficial effects of the embodiments of this application are as follows:

[0033] In this embodiment, on the one hand, by integrating UHF RFID front-end devices such as RF power amplifiers, couplers, filters, and switches into a single RF front-end module, the UHF RFID product is optimized through modular processing, making it simpler and more efficient, and reducing the area required for device deployment. On the other hand, by introducing a first input / output terminal and a second input / output terminal, the interference between the UHF RFID product and the cellular network when they coexist in the same electronic device is reduced.

[0034] The beneficial effects provided in the second aspect and its various possible designs can be found in the first aspect and its various possible implementations, and will not be repeated here. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other embodiments can be obtained based on these drawings.

[0036] Figure 1 This is a schematic diagram of the structure of a radio frequency front-end module provided in an embodiment of this application;

[0037] Figure 2 A schematic diagram of the structure of an RF front-end module for a single-channel surface acoustic wave filter provided in this application embodiment;

[0038] Figure 3 An electronic device that allows for the coexistence of an ultra-high frequency radio frequency identification product and a cellular network, as provided in this application embodiment;

[0039] Figure 4 This is a status indicator diagram of a system-on-a-chip (SOC) provided in an embodiment of this application. Detailed Implementation

[0040] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c alone can mean: a alone, b alone, c alone, a combination of a and b, a combination of a and c, a combination of b and c, or a, b, and c, where a, b, and c can be single or multiple. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] The terms “center,” “longitudinal,” “lateral,” “up,” “down,” “left,” “right,” “front,” and “rear,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0042] The terms "connected" and "connected" should be interpreted broadly. For example, in circuit structures, "connected" or "connected" can refer not only to physical connections but also to electrical or signal connections. This could be a direct connection (physical connection) or an indirect connection via at least one intermediate component, as long as the circuit is connected. It could also refer to the internal connection between two components. Similarly, a signal connection can refer to a connection via a circuit or a medium, such as radio waves. Those skilled in the art will understand the specific meaning of these terms in this application based on the specific circumstances.

[0043] To optimize the technical solutions for discrete components in related technologies, improve UHF RFID products, make UHF RFID products simpler and more efficient, and reduce the interference between UHF RFID products and cellular networks when they operate simultaneously, please refer to [link to relevant documentation]. Figure 1 , Figure 1 An RF front-end module provided in the embodiments of this application, such as Figure 1As shown, the RF front-end module 1000 includes: an RF power amplifier 100, a coupler 200, a filter 300, a switch 400, a first input / output terminal GPIO IN, a second input / output terminal GPIO OUT, and an antenna terminal ANT; the RF power amplifier 100 includes a transmitting terminal Tx_IN, the coupler 200 includes a power detection terminal FBRx and a receiving terminal Rx_OUT; the switch 400 includes a frequency band selection terminal SPEC_SEL, and the antenna terminal ANT is electrically connected to the output terminal of the switch 400.

[0044] The first input / output terminal, GPIO_IN, is used to receive the operating status signal from the external network.

[0045] The second input / output terminal, GPIO_OUT, is used to output the operating status signal of the RF front-end module.

[0046] The power detection terminal FBRx is used to detect the transmit power.

[0047] The radio frequency power amplifier 100 is used to receive the first transmission signal connected to the transmitter Tx_IN, amplify the first transmission signal to obtain the second transmission signal, and transmit the second transmission signal to the coupler.

[0048] Coupler 200 is used to couple the second transmitted signal to filter 300.

[0049] Filter 300 is used to filter the second transmitted signal to obtain the third transmitted signal, and then transmit the third transmitted signal to switch 400.

[0050] Switch 400 is used to select the frequency band path according to the frequency band selection signal accessed by the frequency band selection terminal SPEC_SEL, and transmit the third transmit signal to the antenna terminal ANT.

[0051] The antenna ANT is connected to the first external antenna and is used to transmit the third transmit signal; it is also used to receive the first receive signal and transmit the first receive signal to the switch 400.

[0052] Switch 400 is also used to select a frequency band path based on the frequency band selection signal accessed by the frequency band selection terminal SPEC_SEL, and to transmit the first received signal to the filter.

[0053] The filter 300 is also used to filter the first received signal to obtain the second received signal, and to transmit the second received signal to the coupler.

[0054] Coupler 200 is also used to couple the second received signal to the receiver Rx_OUT.

[0055] Radio frequency (RF) front-end circuitry is one of the fundamental components used to implement wireless network communication. See also... Figure 1 The radio frequency front-end module of the ultra-high frequency radio frequency identification product (i.e., UHF RFID) proposed in this application may include a radio frequency power amplifier (i.e., PA), a coupler, a filter, and a switch. Compared with the discrete device technical solutions proposed in related technologies, this application integrates the radio frequency power amplifier 100 (i.e., PA), coupler, filter, switch, and other UHF RFID front-end devices into a radio frequency front-end module. Through modular processing, the ultra-high frequency radio frequency identification product is optimized, making the ultra-high frequency radio frequency identification product simpler and more efficient, and helping to reduce the area of ​​device deployment.

[0056] The operation of the RF front-end module in this application includes a signal transmission process and a signal reception process. For the signal transmission process, the first transmission signal input to the transmitter is amplified by an RF power amplifier to obtain a second transmission signal. The second transmission signal is then transmitted to a coupler, and through the coupler's direct path, it is transmitted to the input of a filter. The filter filters the second transmission signal to obtain a third transmission signal, which is then transmitted to a switch. The switch selects a frequency band path based on a frequency band selection signal and transmits the third transmission signal to the antenna. The antenna is connected to a first external antenna for transmitting the third transmission signal. For the signal reception process, the process is the reverse of the transmission process. First, a first received signal is received through the first external antenna connected to the antenna and transmitted to the switch. The switch selects a frequency band path based on a frequency band selection signal and transmits the first received signal to a filter. The filter filters the first received signal to obtain a second received signal, which is then transmitted to the coupler. Through the coupler's isolation path, the second received signal is coupled and output to the receiver. The receiver can then transmit the second received signal to other circuits.

[0057] Considering the frequency ranges commonly used in UHF RFID products, namely 865MHz to 868MHz and 902MHz to 928MHz, the RF front-end module proposed in this application creatively introduces filters and switches. It also introduces a band selection terminal, SPEC_SEL, for the switch, which can select the band path based on the band selection signal input to the band selection terminal, thus enabling the RF front-end module in this application to adapt to the frequency range of UHF RFID products.

[0058] To address the coexistence issue between UHF RFID products and cellular networks and reduce the impact between them when they operate simultaneously, the RF front-end module in this application introduces a first input / output terminal GPIO_IN and a second input / output terminal GPIO_OUT. The purpose of these terminals is to indicate and control the operating status of the UHF RFID product, primarily for scenarios where the UHF RFID product is used in coexisting electronic devices with other existing communication systems.

[0059] In one specific embodiment, when an UHF RFID product and a cellular network coexist in the same electronic device, when the UHF RFID product is working, the RF power amplifier starts to work and outputs power. At this time, the second input / output terminal GPIO_OUT outputs a high level to indicate the working status of the UHF RFID product (i.e., the working status signal of the RF front-end module). The second input / output terminal GPIO_OUT can be electrically connected to a system-on-chip (SOC). In this way, the SOC can obtain the working status of the UHF RFID product and then control the working status of the cellular network through a software control mechanism, such as reducing the power of the cellular network or switching the frequency band of the cellular network. Conversely, the first input / output terminal GPIO_IN can also be electrically connected to a system-on-chip (SOC). In this coexistence scenario, if the cellular network operates in a low-frequency band of 800MHz or 900MHz, the SOC outputs a high-level signal to the first input / output terminal GPIO_IN. After receiving the operating status signal from the external network, the first input / output terminal GPIO_IN can control the operating status of the UHF RFID product, for example, by reducing the power of the UHF RFID product or controlling it to stop working. By introducing the first input / output terminal GPIO_IN and the second input / output terminal GPIO_OUT, this application minimizes the impact between the UHF RFID product and the cellular network when they coexist in the same electronic device.

[0060] In this embodiment, on the one hand, by integrating UHF RFID front-end devices such as RF power amplifiers, couplers, filters, and switches into a single RF front-end module, the UHF RFID product is optimized through modular processing, making it simpler and more efficient, and reducing the area required for device deployment. On the other hand, by introducing a first input / output terminal and a second input / output terminal, the interference between the UHF RFID product and the cellular network when they coexist in the same electronic device is reduced.

[0061] In one possible embodiment, when filter 300 is a dual-channel surface acoustic wave filter, switch 400 is a single-pole double-throw switch.

[0062] Since UHF RFID products generally use two frequency ranges: 865MHz–868MHz and 902MHz–928MHz, the RF front-end module proposed in this application creatively introduces filters and switches. It also introduces a band selection terminal (SPEC_SEL) for the switches. With filter 300 being a dual-channel surface acoustic wave (SAW) filter, switch 400 is a single-pole double-throw (SPTD) switch. The dual-channel SAW filter corresponds to the two frequency ranges of the UHF RFID product, and the SPTD switch provides a corresponding band path for each frequency range, facilitating band path selection via the band selection signal input to the SPEC_SEL. For details, see [link to details]. Figure 1 The 866M path represents the frequency range of 865MHz to 868MHz, and the 915M path represents the frequency range of 902MHz to 928MHz. Depending on the region or the required frequency band, one of the surface acoustic wave filters and the switch path is selected. The frequency band path is selected through the frequency band selection signal connected to the SPEC_SEL terminal. For example, when the frequency band selection signal is low, the switch is selected on the 866M path, and when the frequency band selection signal is high, the switch is selected on the 915M path.

[0063] In one possible embodiment, when the filter 300 is a single-channel surface acoustic wave filter, the RF front-end module 1000 includes: an RF power amplifier, a coupler, a filter, a first input / output terminal, a second input / output terminal, and an antenna terminal; the RF power amplifier includes a transmitting terminal, the coupler includes a power detection terminal and a receiving terminal, and the output terminal of the filter is electrically connected to the antenna terminal.

[0064] Since UHF radio frequency identification (RFID) products generally use two frequency ranges: one from 865MHz to 868MHz and the other from 902MHz to 928MHz, the RF front-end module proposed in this application creatively introduces a filter and a switch. In the above embodiments, the filter can be a dual-channel surface acoustic wave (SAW) filter. In this embodiment, the filter 300 can be a single-channel SAW filter. In this case, since the filter is single-channel, there is no need for frequency band path selection, so the switch can be omitted. See also Figure 2 , Figure 2 This application provides an embodiment of an RF front-end module for a single-channel surface acoustic wave (SAW) filter, wherein... Figure 2The frequency range of the single-channel surface acoustic wave filter in (a) is 865MHz to 868MHz (i.e., 866MHz). Figure 2 In (b) of the diagram, the frequency range of the single-channel surface acoustic wave filter is 902MHz to 928MHz (i.e., 915MHz), such as... Figure 2 As shown in (a) and (b), when the filter is a single-channel surface acoustic wave (SAW) filter, the RF front-end module 1000 includes: an RF power amplifier 100, a coupler 200, a filter 300, a first input / output terminal GPIO_IN, a second input / output terminal GPIO_OUT, and an antenna terminal ANT; the RF power amplifier includes a transmitting terminal Tx_IN, the coupler includes a power detection terminal FBRx and a receiving terminal Rx_OUT, and the output terminal of the filter 300 is electrically connected to the antenna terminal ANT. In this application, since the switch has been removed, the output terminal of the filter is electrically connected to the antenna terminal.

[0065] Users can select the appropriate RF front-end module as needed. They can choose a single-channel Surface Acoustic Wave (SAW) filter with a frequency range of 865MHz–868MHz, a single-channel SAW filter with a frequency range of 902MHz–928MHz, or a dual-channel SAW filter. For convenience, the RF front-end modules of different filters can be packaged pin-to-pin, meaning they are pin-compatible, allowing for flexible replacement on the circuit board even if the user selects filters with different frequency ranges.

[0066] In one possible embodiment, the filter is a dual-channel surface acoustic wave (SAW) filter, wherein one channel of the SAW filter has a passband of 865MHz to 868MHz and a center frequency of 866MHz, and the other channel of the SAW filter has a passband of 902MHz to 928MHz and a center frequency of 915MHz.

[0067] The passbands of the two channels in the dual-channel surface acoustic wave filter correspond to the frequency ranges commonly used in UHF radio frequency identification products, namely one frequency range of 865MHz to 868MHz and the other frequency range of 902MHz to 928MHz.

[0068] In one possible embodiment, the center frequency of the single-channel surface acoustic wave filter is 866MHz or 915MHz.

[0069] In one possible embodiment, the surface acoustic wave filter has an insertion loss of no more than 2dB, a maximum standing wave ratio of no more than 2dB, mid-to-high frequency suppression of more than 30dB, and low-frequency suppression of 700MHz of more than 30dB.

[0070] For both single-channel and dual-channel surface acoustic wave (SAW) filters, the insertion loss in the passband of the SAW filter should not exceed 2dB, the maximum standing wave ratio (VSWR) should not exceed 2dB, and the suppression of intermediate and high frequencies should be greater than 30dB, as should the suppression of low frequencies up to 700MHz. Thus, when UHF RFID products coexist with cellular networks, the transmitted signals of the UHF RFID products, after passing through filters, have little impact on the 700MHz signals of the cellular network at intermediate, high, and low frequencies. Similarly, when the UHF RFID products receive signals, the received signals also pass through filters. Therefore, when the cellular network operates at 700MHz at intermediate, high, and low frequencies, the impact on the UHF RFID products is also minimal. Consequently, setting the parameters of the surface acoustic wave (SAW) filter to have an insertion loss not exceeding 2dB, a maximum standing wave ratio not exceeding 2dB, mid-to-high frequency suppression greater than 30dB, and low-frequency (700MHz) suppression greater than 30dB is beneficial for the coexistence of UHF RFID products and cellular networks.

[0071] In one possible embodiment, the RF front-end module 1000 further includes a power supply terminal PWR. The power supply terminal PWR is electrically connected to the power supply circuit inside the RF front-end module and is used to supply power to the devices inside the RF front-end module.

[0072] This application also provides an electronic device, see [link to relevant documentation] Figure 3 , Figure 3 An electronic device that allows for the coexistence of an ultra-high frequency radio frequency identification product and a cellular network, as provided in this application embodiment, is as follows: Figure 3 As shown, the electronic device includes: the aforementioned radio frequency front-end module 1000, and also includes: a system-on-a-chip (SOC), a transceiver (TRC), and cellular network equipment.

[0073] The frequency band selection terminal SPEC_SEL is electrically connected to the first terminal GPIO_1 of the system-on-a-chip (SoC), the first input / output terminal GPIO_IN is electrically connected to the second terminal GPIO_2 of the SoC, and the second input / output terminal GPIO_OUT is electrically connected to the third terminal GPIO_3 of the SoC.

[0074] The transmitter Tx_IN is electrically connected to the first terminal RFID_TX of the transceiver TRC, and the power detection terminal FBRx is electrically connected to the second terminal RFID_FBRx of the transceiver TRC; the receiver Rx_OUT is electrically connected to the third terminal RFID_RX of the transceiver TRC.

[0075] Cellular network equipment is electrically connected to the transceiver TRC.

[0076] like Figure 3As shown, in this embodiment, the transmitting end Tx_IN, the power detection end FBRx, and the receiving end Rx_OUT of the RF front-end module are electrically connected to the first end RFID_TX, the second end RFID_FBRx, and the third end RFID_RX of the transceiver TRC, respectively. Through the electrical connection between the transceiver and the RF front-end module, bidirectional transmission of communication signals is achieved. During communication, the transmitter converts information into electromagnetic waves and transmits them through an external antenna, while the receiver converts the received electromagnetic waves into understandable information. This is prior art, and the specific working process of the transceiver and the RF front-end module will not be elaborated further in this application.

[0077] On the other hand, such as Figure 3 As shown, in this embodiment, the frequency band selection terminal SPEC_SEL, the first input / output terminal GPIO_IN, and the second input / output terminal GPIO_OUT of the RF front-end module are electrically connected to the first terminal GPIO_1, the second terminal GPIO_2, and the third terminal GPIO_3 of the system-on-a-chip (SOC), respectively. The SOC controls the frequency band path selection based on the frequency band selection signal, and also controls the operating status of the cellular network equipment and the UHF RFID product. This reduces the interference between the UHF RFID product and the cellular network when they coexist in the same electronic device.

[0078] In one specific embodiment, see Figure 4 , Figure 4 A status indicator diagram of a system-on-a-chip (SOC) provided in this application embodiment, such as... Figure 4 As shown, for the frequency band selection terminal SPEC_SEL of the RF front-end module, the first terminal GPIO_1 of the system-on-a-chip (SOC) is an output port that controls the frequency band selection in the RF front-end module, i.e., the frequency band selection of the UHF RFID product. For example, when GPIO_1 is low, the frequency band of UHF RFID is 865MHz~868MHz (i.e., 866M), and when GPIO_1 is high, the frequency band of UHF RFID is 902MHz~928MHz (i.e., 915M).

[0079] See Figure 4The second terminal of the system-on-a-chip (SoC), GPIO_2, is in output mode and is used to provide the low-frequency operating status of cellular network devices. For example, when the cellular network device is operating at a low frequency (800MHz or 900MHz), GPIO_2 is high; when the cellular network device is not operating at a low frequency (800MHz or 900MHz), GPIO_2 is low. The third terminal of the SoC, GPIO_3, is in input mode and is used to provide the operating status of UHF RFID products. When UHF RFID is operating, GPIO_OUT and GPIO_3 are high; when UHF RFID is not operating, GPIO_OUT and GPIO_3 are low.

[0080] In one possible embodiment, see Figure 3 The cellular network equipment includes: a low-frequency module (LB Module) and a mid-to-high-frequency module (MHB Module), a combiner, and a second external antenna.

[0081] The first terminal of the low-frequency module LB Module is electrically connected to the fourth terminal LB_TX of the transceiver TRC, and the second terminal of the low-frequency module LB Module is electrically connected to the fifth terminal LB_RX of the transceiver TRC.

[0082] The first terminal of the MHB Module is electrically connected to the sixth terminal MHB_TX of the transceiver TRC, and the second terminal of the MHB Module is electrically connected to the seventh terminal MHB_RX of the transceiver TRC.

[0083] The first terminal of the combiner is electrically connected to the third terminal of the low-frequency module LB Module, the second terminal of the combiner is electrically connected to the third terminal of the mid-to-high frequency module MHB Module, and the output terminal of the combiner is electrically connected to the second external antenna.

[0084] In one possible embodiment, see Figure 3 The passband of the low-frequency module (LB Module) is 500MHz to 960MHz, and the passband of the mid-to-high frequency module (MHB Module) is 1427MHz to 2690MHz.

[0085] Finally, it should be noted that the above embodiments are merely specific implementations of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be covered 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, The radio frequency front-end module includes: a radio frequency power amplifier, a coupler, a filter, a switch, a first input / output terminal, a second input / output terminal, and an antenna terminal; the radio frequency power amplifier includes a transmitting terminal, the coupler includes a power detection terminal and a receiving terminal; the switch includes a frequency band selection terminal, and the antenna terminal is electrically connected to the output terminal of the switch; The first input / output terminal is used to receive the operating status signal of an external network; The second input / output terminal is used to output the operating status signal of the radio frequency front-end module; The power detection terminal is used to detect the transmission power; The radio frequency power amplifier is used to receive the first transmission signal connected to the transmitter, amplify the first transmission signal to obtain a second transmission signal, and transmit the second transmission signal to the coupler; The coupler is used to couple the second transmitted signal to the filter; The filter is used to filter the second transmitted signal to obtain a third transmitted signal, and transmit the third transmitted signal to the switch; The switch is used to select a frequency band path according to the frequency band selection signal accessed by the frequency band selection terminal, and to transmit the third transmission signal to the antenna terminal; The antenna end is connected to the first external antenna and is used to transmit the third transmission signal; it is also used to receive the first reception signal and transmit the first reception signal to the switch; The switch is also used to select a frequency band path according to the frequency band selection signal accessed by the frequency band selection terminal, and to transmit the first received signal to the filter; The filter is further configured to filter the first received signal to obtain a second received signal, and transmit the second received signal to the coupler; The coupler is also used to couple the second received signal to the receiving end.

2. The radio frequency front-end module according to claim 1, characterized in that, In the case where the filter is a dual-channel surface acoustic wave filter, the switch is a single-pole double-throw switch.

3. The radio frequency front-end module according to claim 1, characterized in that, In the case where the filter is a single-channel surface acoustic wave filter, the RF front-end module includes: an RF power amplifier, a coupler, a filter, a first input / output terminal, a second input / output terminal, and an antenna terminal; the RF power amplifier includes a transmitting terminal, the coupler includes a power detection terminal and a receiving terminal, and the output terminal of the filter is electrically connected to the antenna terminal.

4. The radio frequency front-end module according to claim 2, characterized in that, The filter is a dual-channel surface acoustic wave (SAW) filter, wherein one channel of the SAW filter has a passband of 865MHz to 868MHz and a center frequency of 866MHz, and the other channel of the SAW filter has a passband of 902MHz to 928MHz and a center frequency of 915MHz.

5. The radio frequency front-end module according to claim 3, characterized in that, The center frequency of the single-channel surface acoustic wave filter is 866MHz or 915MHz.

6. The radio frequency front-end module according to any one of claims 2-5, characterized in that, The surface acoustic wave filter has an insertion loss of no more than 2dB, a maximum standing wave ratio of no more than 2dB, a mid-to-high frequency suppression of more than 30dB, and a low-frequency suppression of more than 30dB at 700MHz.

7. The radio frequency front-end module according to claim 1, characterized in that, The radio frequency front-end module also includes a power supply terminal.

8. An electronic device, characterized in that, The electronic device includes: a radio frequency front-end module as described in any one of claims 1-7, and further includes: a system-on-a-chip, a transceiver, and a cellular network device; The frequency band selection terminal is electrically connected to the first terminal of the system-on-a-chip, the first input / output terminal is electrically connected to the second terminal of the system-on-a-chip, and the second input / output terminal is electrically connected to the third terminal of the system-on-a-chip. The transmitting end is electrically connected to the first end of the transceiver, the power detection end is electrically connected to the second end of the transceiver, and the receiving end is electrically connected to the third end of the transceiver. The cellular network device is electrically connected to the transceiver.

9. The electronic device according to claim 8, characterized in that, The cellular network equipment includes: a low-frequency module and a medium-to-high-frequency module, a combiner, and a second external antenna; The first terminal of the low-frequency module is electrically connected to the fourth terminal of the transceiver, and the second terminal of the low-frequency module is electrically connected to the fifth terminal of the transceiver. The first terminal of the medium-high frequency module is electrically connected to the sixth terminal of the transceiver, and the second terminal of the medium-high frequency module is electrically connected to the seventh terminal of the transceiver. The first end of the combiner is electrically connected to the third end of the low-frequency module, the second end of the combiner is electrically connected to the third end of the mid-high frequency module, and the output end of the combiner is electrically connected to the second external antenna.

10. The electronic device according to claim 9, characterized in that, The passband of the low-frequency module is 500MHz to 960MHz, and the passband of the mid-to-high frequency module is 1427MHz to 2690MHz.

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