Radio frequency front-end module and electronic equipment

Abstract

The invention provides a radio frequency front-end module and electronic equipment. The radio frequency front-end module comprises a radio frequency power amplifier, a coupler, a filter, a switch, a first input / output end, a second input / output end and an antenna end, the radio frequency power amplifier comprises a transmitting end, and the coupler comprises a power detection end and a receiving end; the switch comprises a frequency band selection end, and the antenna end is electrically connected with the output end of the switch; the first input and output end is used for receiving a working state signal of an external network; and the second input / output end is used for outputting a working state signal of the radio frequency front-end module. The radio frequency power amplifier, the coupler, the filter and the switch are integrated into the radio frequency front-end module, so that an ultrahigh-frequency radio frequency identification product is optimized, the ultrahigh-frequency radio frequency identification product is simpler and more efficient, and the arrangement area of devices is reduced. The first input / output end and the second input / output end are introduced, so that the influence between the ultrahigh-frequency radio frequency identification product and the cellular network when the ultrahigh-frequency radio frequency identification product and the cellular network work at the same time is reduced.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a radio frequency front-end module and electronic equipment. Background Art

[0002] For the RF front-end circuit of UHF RFID products, the existing technical solution is to complete the RFID function through discrete devices. For electronic devices in multi-communication systems, since more scenarios need to be considered, the requirements for functions are higher. The technical solution of discrete devices is limited because each device is completely independent, each device realizes its own function, and there is a lack of status indication and management between devices.

[0003] On the other hand, with the further popularization of the application of UHF wireless RFID products, more and more applications are being used in some electronic devices that already have other communication systems. As an existing communication system, cellular networks have penetrated into all aspects of people's production and life, especially mobile terminal products. When UHF wireless RFID products are used in some electronic devices that already have other communication systems, it is necessary to focus on the coexistence between UHF wireless RFID products and other communication systems. From the spectrum point of view, the communication system that shares the same frequency range or a similar frequency range with UHF wireless RFID products is mainly the cellular network. Traditional cellular networks can be divided into low frequency, medium frequency and high frequency in terms of frequency. Among them, the frequency range of low frequency is 617MHZ~960MHZ, and the frequency range commonly used by UHF wireless RFID products includes two, one frequency range is 865MHZ~868MHZ, and the other frequency range is 902MHZ~928MHZ. The operating frequency of UHF wireless RFID products just falls into the low-frequency range of cellular networks. This will cause interference between the two when they work at the same time, and may even directly lead to communication interruption of one of them. How to solve the coexistence problem between UHF wireless RFID products and cellular networks and reduce the impact between UHF wireless RFID products and cellular networks is also critical. Summary of the invention

[0004] The present application provides a radio frequency front-end module and electronic equipment to optimize ultra-high frequency radio frequency identification products and reduce the impact between ultra-high frequency radio frequency identification products and cellular networks when they work simultaneously. The specific technical solution is as follows:

[0005] In a first aspect, the present application provides a radio frequency front-end module, the radio frequency front-end module comprising: a radio frequency power amplifier, a coupler, a filter, a switch, a first input and output terminal, a second input and output terminal, and an antenna terminal; the radio frequency power amplifier comprises a transmitting terminal, the coupler comprises a power detection terminal and a receiving terminal; the switch comprises 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 a working status signal from an external network;

[0007] The second input-output terminal is used to output a working status signal of the RF front-end module;

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

[0009] The RF power amplifier is used to receive a first transmission signal connected to the transmitting end, 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 transmit signal to the filter;

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

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

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

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

[0015] The filter is further used 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 further used to couple the second received signal to the receiving end.

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

[0018] In one possible design, when 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 and output terminal, a second input and 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 filter, wherein the passband of the surface acoustic wave filter of one channel is 865MHZ~868MHZ and the center frequency is 866MHZ, and the passband of the surface acoustic wave filter of the other channel is 902MHZ~928MHZ and the center frequency is 915MHZ.

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

[0021] In a possible design, the insertion loss of the surface acoustic wave filter does not exceed 2dB, the maximum standing wave ratio does not exceed 2dB, the mid-high frequency suppression is greater than 30dB, and the low frequency 700MHZ suppression is greater than 30dB.

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

[0023] In a second aspect, the present application provides an electronic device, the electronic device comprising: a radio frequency front-end module as claimed in any one of claims 1 to 7, and further comprising: a system-level chip, a transceiver, and a cellular network device;

[0024] The frequency band selection end is electrically connected to the first end of the system-level chip, the first input-output end is electrically connected to the second end of the system-level chip, and the second input-output end is electrically connected to the third end of the system-level chip;

[0025] The transmitting end is electrically connected to the first end of the transceiver, the power detecting end is electrically connected to the second end of the transceiver; 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 medium-high-frequency module, a combiner, and a second external antenna;

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

[0029] The first end of the medium and high frequency module is electrically connected to the sixth end of the transceiver, and the second end of the medium and high frequency module is electrically connected to the seventh end 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 medium and high frequency module, and the output end of the combiner is electrically connected to the second external antenna.

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

[0032] Beneficial effects of the embodiments of the present application:

[0033] In the embodiment of the present application, on the one hand, by integrating UHFRFID front-end devices such as RF power amplifier, coupler, filter, switch into a RF front-end module, the UHF wireless RFID product is optimized through modular processing, making the UHF wireless RFID product more concise and efficient, which is conducive to reducing the area of ​​device layout. On the other hand, by introducing the first input and output terminals and the second input and output terminals, the UHF wireless RFID product and the cellular network can coexist in the same electronic device, reducing the impact between the UHF wireless RFID product and the cellular network when they work at the same time.

[0034] The beneficial effects provided in the above-mentioned second aspect and various possible designs of the above-mentioned second aspect can refer to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other embodiments can also be obtained based on these drawings.

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

[0037] Figure 2 A schematic structural diagram of a radio frequency front-end module in which a filter is a single-channel surface acoustic wave filter provided in an embodiment of the present application;

[0038] Figure 3 An electronic device for coexisting an ultra-high frequency radio frequency identification product and a cellular network provided in an embodiment of the present application;

[0039] Figure 4 A status indication diagram of a system-on-chip (SOC) provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In this application, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c alone can represent: a, b, c, a and b, a and c, or a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0041] The directions or positional relationships indicated by terms such as "center", "longitudinal", "lateral", "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0042] The terms "connected" and "connected" should be understood in a broad sense. For example, the "connected" or "connected" of a circuit structure can refer to not only physical connection, but also electrical connection or signal connection. For example, it can be directly connected, that is, physically connected, or indirectly connected through at least one intermediate element, as long as the circuit is connected, or it can be the internal connection of two elements; signal connection can refer to signal connection through a circuit or through a media medium, such as radio waves. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] In order to optimize the technical solutions of discrete devices in related technologies, optimize UHF wireless RFID products, make UHF wireless RFID products more concise and efficient, and reduce the impact between UHF wireless RFID products and cellular networks when they work simultaneously, please refer to Figure 1 , Figure 1 A radio frequency front-end module is provided in an embodiment of the present 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 and output terminal GPIO IN, a second input and 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 a working status signal from an external network.

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

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

[0047] The RF power amplifier 100 is used to receive a first transmission signal connected to the transmitting terminal Tx_IN, amplify the first transmission signal to obtain a second transmission signal, and transmit the second transmission signal to the coupler.

[0048] The coupler 200 is used to couple the second transmit signal to the filter 300 .

[0049] The filter 300 is used to filter the second transmit signal to obtain a third transmit signal, and transmit the third transmit signal to the switch 400 .

[0050] The switch 400 is used to select a frequency band path according to the frequency band selection signal received by the frequency band selection terminal SPEC_SEL, and transmit the third transmission signal to the antenna terminal ANT.

[0051] The antenna terminal ANT 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 400 .

[0052] The switch 400 is further configured to select a frequency band path according to a frequency band selection signal inputted by the frequency band selection terminal SPEC_SEL, and transmit the first received signal to the filter.

[0053] The filter 300 is further configured to filter the first received signal to obtain a second received signal, and transmit the second received signal to the coupler.

[0054] The coupler 200 is further configured to couple the second received signal to output to the receiving end Rx_OUT.

[0055] The RF front-end circuit is one of the basic components used to implement wireless network communications. Figure 1 The RF front-end module of the ultra-high frequency wireless radio frequency identification product (i.e., UHF RFID) proposed in this application may include a RF power amplifier (i.e., PA), a coupler, a filter, and a switch. Compared with the technical solution of discrete devices proposed in the related art, this application integrates UHF RFID front-end devices such as a RF power amplifier 100 (i.e., PA), a coupler, a filter, and a switch into a RF front-end module. Through modular processing, the ultra-high frequency wireless radio frequency identification product is optimized, making the ultra-high frequency wireless radio frequency identification product more concise and efficient, which is conducive to reducing the area of ​​device layout.

[0056] The working process of the RF front-end module in the present application includes a signal transmission process and a signal receiving process. For the signal transmission process, the first transmission signal connected to the transmitting end is amplified by the RF power amplifier to obtain a second transmission signal, the second transmission signal is transmitted to the coupler, and the second transmission signal is transmitted to the input end of the filter through the direct path of the coupler. The filter filters the second transmission signal to obtain a third transmission signal, and transmits the third transmission signal to the switch. The switch selects the frequency band path according to the frequency band selection signal, and transmits the third transmission signal to the antenna end. The antenna end is connected to the first external antenna for transmitting the third transmission signal; for the signal receiving process, the process is opposite to the transmission process. First, the first reception signal is received by the first external antenna connected to the antenna end, and the first reception signal is transmitted to the switch. The switch selects the frequency band path according to the frequency band selection signal, and transmits the first reception signal to the filter. The filter filters the first reception signal to obtain the second reception signal, and the second reception signal is transmitted to the coupler. The second reception signal is coupled and output to the receiving end through the isolation path of the coupler, and the second reception signal can be transmitted to other circuits through the receiving end.

[0057] Taking into account the frequency range commonly used in ultra-high frequency wireless radio frequency identification products, that is, one frequency range is 865MHZ~868MHZ, and the other frequency range is 902MHZ~928MHZ, the RF front-end module proposed in this application creatively introduces filters and switches, and also introduces a band selection terminal SPEC_SEL for the switch. The band path selection can be performed according to the band selection signal connected to the band selection terminal, so that the RF front-end module in this application can adapt to the frequency range of ultra-high frequency wireless radio frequency identification products.

[0058] In order to solve the coexistence problem between UHF wireless RFID products and cellular networks and reduce the impact between the two when UHF wireless RFID products and cellular networks work at the same time, the RF front-end module in this application also introduces a first input and output terminal GPIO_IN and a second input and output terminal GPIO_OUT, the purpose of which is to indicate and control the working status of the UHF wireless RFID product, mainly for the coexistence scenarios in which UHF wireless RFID products are used in some electronic devices that already have other communication systems.

[0059] In a specific embodiment, when the UHF wireless radio frequency identification product and the cellular network coexist in the same electronic device, when the UHF wireless radio frequency identification product is working, the radio frequency power amplifier starts to work and has power output. At this time, the second input and output terminal GPIO_OUT outputs a high level to indicate the working state of the UHF wireless radio frequency identification product (i.e., the working state signal of the radio frequency front-end module). The second input and output terminal GPIO_OUT can be electrically connected to the system-on-chip (System onChip, SOC), so that the system-on-chip can obtain the working state of the UHF wireless radio frequency identification product, and then control the working state of the cellular network through the software control mechanism, for example, reducing the power of the cellular network or switching the frequency band of the cellular network. On the contrary, the first input and output terminal GPIO_IN can also be electrically connected to the system on chip (System on Chip, SOC). In this coexistence scenario, if the operating frequency band of the cellular network is a low frequency band of 800MHZ or 900MHZ, a high-level signal is output to the first input and output terminal GPIO_IN through the system-level chip. After the first input and output terminal GPIO_IN receives the working status signal of the external network, it can control the working status of the UHF wireless radio frequency identification product, for example, reduce the power of the UHF wireless radio frequency identification product or control the UHF wireless radio frequency identification product to stop working, etc. In this application, by introducing the first input and output terminal GPIO_IN and the second input and output terminal GPIO_OUT, when the UHF wireless radio frequency identification product and the cellular network coexist in the same electronic device, the impact between the two can be minimized.

[0060] In the embodiment of the present application, on the one hand, by integrating UHFRFID front-end devices such as RF power amplifier, coupler, filter, switch into a RF front-end module, the UHF wireless RFID product is optimized through modular processing, making the UHF wireless RFID product more concise and efficient, which is conducive to reducing the area of ​​device layout. On the other hand, by introducing the first input and output terminals and the second input and output terminals, the UHF wireless RFID product and the cellular network can coexist in the same electronic device, reducing the impact between the UHF wireless RFID product and the cellular network when they work at the same time.

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

[0062] Since the frequency ranges commonly used in UHF wireless radio frequency identification products include two, one frequency range is 865MHZ~868MHZ, and the other frequency range is 902MHZ~928MHZ, the RF front-end module proposed in this application creatively introduces filters and switches, and also introduces a frequency band selection terminal SPEC_SEL for the switch. When the filter 300 is a dual-channel surface acoustic wave filter (i.e., Dual SAW), the switch 400 is a single-pole double-throw switch (i.e., SPTD). The dual-channel surface acoustic wave filter corresponds to the two frequency ranges of the UHF wireless radio frequency identification product, and the single-pole double-throw switch is used to provide a corresponding frequency band path for each frequency range, which is beneficial for the frequency band selection signal connected to the frequency band selection terminal SPEC_SEL to select the frequency band path. For details, see Figure 1 , the frequency range of 865MHZ to 868MHZ is represented by the 866M channel, and the frequency range of 902MHZ to 928MHZ is represented by the 915M channel. According to the area or the required frequency band, one of the surface acoustic wave filters and the switch channel is selected, and the band channel is selected through the band selection signal connected to the band selection terminal SPEC_SEL. For example, when the band selection signal is at a low level, the switch is selected on the 866M channel, and when the band selection signal is at a high level, the switch is selected on the 915M channel.

[0063] In a 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 and output terminal, a second input and 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 the frequency ranges commonly used in UHF wireless radio frequency identification products include two, one frequency range is 865MHZ~868MHZ, and the other frequency range is 902MHZ~928MHZ, the RF front-end module proposed in this application creatively introduces filters and switches. In the above embodiment, the filter can be a dual-channel surface acoustic wave filter. In the embodiment of this application, the filter 300 can be a single-channel surface acoustic wave filter. At this time, since the filter is a single channel, there is no need to select the frequency band path, so the switch can be removed. See Figure 2 , Figure 2 A filter provided in an embodiment of the present application is a radio frequency front-end module in which the filter is a single-channel surface acoustic wave filter, wherein: Figure 2The frequency range of the single-channel surface acoustic wave filter in (a) is 865MHZ to 868MHZ (i.e. 866M). Figure 2 The frequency range of the single-channel surface acoustic wave filter in (b) is 902MHZ~928MHZ (i.e. 915M), such as Figure 2 As shown in (a) and (b), when the filter is a single-channel surface acoustic wave filter, the RF front-end module 1000 includes: an RF power amplifier 100, a coupler 200, a filter 300, a first input and output terminal GPIO_IN, a second input and 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 is removed, the output terminal of the filter is electrically connected to the antenna terminal.

[0065] During use, users can choose the RF front-end module according to their needs. They can choose a single-channel SAW filter with a frequency range of 865MHZ to 868MHZ, a single-channel SAW filter with a frequency range of 902MHZ to 928MHZ, or a dual-channel SAW filter. For convenience, the packaging of the RF front-end modules of different filters can be designed as pin to pin, that is, pin compatible, so that even if the user chooses filters with different frequency ranges, they can be flexibly replaced on the circuit board.

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

[0067] The passbands of the two channels in the dual-channel surface acoustic wave filter correspond to the frequency range commonly used in ultra-high frequency wireless radio frequency identification products, that is, one frequency range is 865MHZ to 868MHZ, and the other frequency range is 902MHZ to 928MHZ.

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

[0069] In a possible embodiment, the insertion loss of the surface acoustic wave filter does not exceed 2 dB, the maximum standing wave ratio does not exceed 2 dB, the mid-high frequency suppression is greater than 30 dB, and the low frequency 700 MHZ suppression is greater than 30 dB.

[0070] For single-channel SAW filters and dual-channel SAW filters, the insertion loss in the passband of the SAW filter does not exceed 2dB, and the maximum VSWR does not exceed 2dB. At the same time, the suppression of intermediate and high frequencies is greater than 30dB, and the suppression of the low frequency 700MHZ is also greater than 30dB. In this way, when UHF wireless RFID products coexist with cellular networks, the transmission signal of the UHF wireless RFID products passes through the filter, which has little effect on the intermediate frequency, high frequency and low frequency 700MHZ signals of the cellular network; in addition, when the UHF wireless RFID products receive signals, the received signals will also pass through the filter. When the cellular network works at the intermediate frequency, high frequency and low frequency 700MHZ, the impact on the UHF wireless RFID products will not be great. Therefore, setting the parameters of the surface acoustic wave filter so that the insertion loss does not exceed 2dB, the maximum standing wave ratio does not exceed 2dB, the intermediate and high frequency suppression is greater than 30dB, and the low frequency 700MHZ suppression is greater than 30dB is beneficial for the coexistence of UHF wireless RFID products and cellular networks.

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

[0072] The present application also provides an electronic device, see Figure 3 , Figure 3 An electronic device in which an ultra-high frequency radio frequency identification product and a cellular network coexist is provided in an embodiment of the present application, such as Figure 3 As shown, the electronic device includes: the above-mentioned RF front-end module 1000, and also includes: a system-on-chip SOC, a transceiver TRC and a cellular network device.

[0073] The band selection terminal SPEC_SEL is electrically connected to the first terminal GPIO_1 of the system chip SOC, the first input and output terminal GPIO_IN is electrically connected to the second terminal GPIO_2 of the system chip SOC, and the second input and output terminal GPIO_OUT is electrically connected to the third terminal GPIO_3 of the system chip SOC.

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

[0075] The cellular network device is electrically connected to the transceiver TRC.

[0076] like Figure 3As shown, in the embodiment of the present application, 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. The transceiver is electrically connected to the RF front-end module to realize the two-way transmission of the communication signal. During the communication process, the transmitter converts the information into electromagnetic waves and sends it out through the external antenna, and the receiver converts the received electromagnetic waves into understandable information. This is the prior art, and the specific working process of the transceiver and the RF front-end module in this application will not be repeated.

[0077] On the other hand, Figure 3 As shown, in the embodiment of the present application, the band selection terminal SPEC_SEL, the first input and output terminal GPIO_IN, and the second input and 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-level chip SOC, respectively. The system-level chip SOC controls the switch to select the band path according to the band selection signal, and controls the working state of the cellular network device and the UHF wireless radio frequency identification product through the system-level chip SOC, so that when the UHF wireless radio frequency identification product and the cellular network coexist in the same electronic device, the impact between the UHF wireless radio frequency identification product and the cellular network when they work at the same time is reduced.

[0078] In a specific embodiment, see Figure 4 , Figure 4 A state indication diagram of a system-on-chip (SOC) provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, for the frequency band selection end SPEC_SEL of the RF front-end module, the first end GPIO_1 of the system-on-chip SOC is an output port, which controls the frequency band channel selection in the RF front-end module, that is, the selection of the frequency band of the ultra-high frequency wireless radio frequency identification product UHF RFID. For example, when GPIO_1 is at a low level, the frequency band of UHF RFID is 865MHZ~868MHZ (i.e. 866M), and when GPIO_1 is at a high level, the frequency band of UHF RFID is 902MHZ~928MHZ (i.e. 915M).

[0079] See also Figure 4, the second terminal GPIO_2 of the system-level chip SOC is in output mode, which is used to provide the low-frequency working state of the cellular network device. For example, when the cellular network device works at a low frequency (800MHZ or 900MHZ), GPIO_2 is a high level, and when the cellular network device does not work at a low frequency (800MHZ or 900MHZ), GPIO_2 is a low level. The third terminal GPIO_3 of the system-level chip SOC is in input mode, which is used to provide the working state of the ultra-high frequency wireless radio frequency identification product UHF RFID. When the UHF RFID works, GPIO_OUT and GPIO_3 are high levels, and when the UHF RFID does not work, GPIO_OUT and GPIO_3 are low levels.

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

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

[0082] A first end of the medium-high frequency module MHB Module is electrically connected to the sixth end MHB_TX of the transceiver TRC, and a second end of the medium-high frequency module MHB Module is electrically connected to the seventh end MHB_RX of the transceiver TRC.

[0083] The first end of the combiner is electrically connected to the third end of the low frequency module LB Module, the second end of the combiner is electrically connected to the third end of the medium and high frequency module MHB Module, and the output end 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~960MHZ, and the passband of the medium- and high-frequency module MHB Module is 1427MHZ~2690MHZ.

[0085] Finally, it should be noted that the above embodiments are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A radio frequency front-end module, characterized in that: The RF front-end module includes: a 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; The first input / output terminal is used to receive a working status signal from an external network; The second input-output terminal is used to output a working status signal of the RF front-end module; The power detection end is used to detect the transmission power; The RF power amplifier is used to receive the first transmission signal connected to the transmitting end, 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 transmit signal to the filter; The filter is used to filter the second transmission signal to obtain a third transmission signal, and transmit the third transmission signal to the switch; The switch is used to select a frequency band path according to the frequency band selection signal received by the frequency band selection end, and transmit the third transmission signal to the antenna end; The antenna end is connected to the first external antenna, and is used to transmit the third transmission signal; and is also used to receive the first reception signal, and transmit the first reception signal to the switch; The switch is further used to select a frequency band path according to the frequency band selection signal received by the frequency band selection terminal, and transmit the first received signal to the filter; The filter is further used to filter the first received signal to obtain a second received signal, and transmit the second received signal to the coupler; The coupler is further used to couple the second received signal to the receiving end.

2. The RF front-end module according to claim 1, characterized in that: When the filter is a dual-channel surface acoustic wave filter, the switch is a single-pole double-throw switch.

3. The RF 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 and output terminal, a second input and 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 RF front-end module according to claim 2, characterized in that: The filter is a dual-channel surface acoustic wave filter, wherein the passband of the surface acoustic wave filter of one channel is 865MHZ-868MHZ and the center frequency is 866MHZ, and the passband of the surface acoustic wave filter of the other channel is 902MHZ-928MHZ and the center frequency is 915MHZ.

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

6. The RF front-end module according to any one of claims 2 to 5, characterized in that: The insertion loss of the surface acoustic wave filter does not exceed 2dB, the maximum standing wave ratio does not exceed 2dB, the mid-high frequency suppression is greater than 30dB, and the low frequency 700MHZ suppression is greater than 30dB.

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

8. An electronic device, characterized in that: The electronic device comprises: the radio frequency front-end module according to any one of claims 1 to 7, and further comprises: a system-level chip, a transceiver and a cellular network device; The frequency band selection end is electrically connected to the first end of the system-level chip, the first input-output end is electrically connected to the second end of the system-level chip, and the second input-output end is electrically connected to the third end of the system-level chip; The transmitting end is electrically connected to the first end of the transceiver, the power detecting end is electrically connected to the second end of the transceiver; 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 device includes: a low-frequency module, a medium- and high-frequency module, a combiner, and a second external antenna; The first end of the low-frequency module is electrically connected to the fourth end of the transceiver, and the second end of the low-frequency module is electrically connected to the fifth end of the transceiver; The first end of the medium and high frequency module is electrically connected to the sixth end of the transceiver, and the second end of the medium and high frequency module is electrically connected to the seventh end 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 medium and 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 medium and high frequency module is 1427MHZ to 2690MHZ.

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