CN116938278A

CN116938278A - Radio frequency front-end device and signal processing method

Info

Publication number: CN116938278A
Application number: CN202210326365.8A
Authority: CN
Inventors: 张鹏; 宋吉伟; 同希希
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2023-10-24
Also published as: WO2023185307A1

Abstract

The embodiment of the application provides a radio frequency front-end device and a radio frequency front-end method. The device comprises a low-noise amplifier, a first radio frequency switch and a first filter, wherein the output end of the low-noise amplifier is connected with the first filter. The first radio frequency switch is used for conducting the receiving circuit. The low noise amplifier is used for amplifying the received signal. The first filter is used for filtering the amplified received signal. The device disclosed by the application rearranges the filter, namely, the filter in the receiving circuit is arranged at the output end of the low-noise amplifier, so that the equivalent noise coefficient of the system is reduced, the receiving sensitivity of the system in the high-frequency coexistence is further improved, even the effect of zero desensitization is achieved, and the system performance is improved.

Description

Radio frequency front-end device and signal processing method

Technical Field

The embodiment of the application relates to the field of radio frequency, and more particularly relates to a radio frequency front-end device and a signal processing method.

Background

With the rapid development of communication technology, wireless local area networks (Wireless Local Area Network, WLAN) are widely used, and in particular wireless fidelity (wireless fidelity, wiFi) signals are being introduced into more and more smart devices.

Currently, the system architecture of the WiFi dual-band product supports 2.4GHz+5GHz frequency band simultaneous operation, and the system architecture of the WiFi tri-band product supports 2.4GHz+5GHz+6GHz frequency band simultaneous operation. Because the interval between the high frequency of 5GHz and the low frequency of 6GHz is smaller, the two may interfere with each other when transmitting signals. For example, the transmission of a 6GHz signal will generate strong interference, so that the 5GHz band is blocked from being received, which further results in deterioration of the system receiving sensitivity.

Therefore, how to solve the degradation of the reception sensitivity caused by the co-existence interference of the frequency band is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a radio frequency front-end device and a signal processing method, which can improve the receiving sensitivity in the high-frequency coexistence and improve the system performance.

In a first aspect, a radio frequency front end device is provided. The radio frequency front-end device comprises a low-noise amplifier, a first radio frequency switch and a first filter, wherein the output end of the low-noise amplifier is connected with the first filter. The first radio frequency switch is used for conducting the receiving circuit. The low noise amplifier is used for amplifying the received signal with low noise. The first filter is used for filtering the amplified received signal.

It should be appreciated that the radio frequency front end devices provided above are suitable for use in a receiving circuit.

According to the device disclosed by the application, the filter is rearranged, namely the filter in the receiving circuit is arranged at the output end of the low-noise amplifier, so that the equivalent Noise Figure (NF) of the system is reduced, the receiving sensitivity of the system in high-frequency coexistence is further improved, even the effect of zero desensitization is achieved, and the system performance is improved.

It should be noted that, the low noise amplifier, the first rf switch and the first filter may be separate chip structures to form a distributed rf front-end device (for example, a Front End Module (FEM)), or may be a combined chip structure, and integrated rf front-end devices may be formed by a system-in-chip package (system in a package, SIP) or board-level integration. The radio frequency integration level is higher by simplifying the system architecture, so that the system design cost is reduced, and the system performance is improved.

In addition, the filters and the radio frequency switch are functional modules, and the number thereof is not particularly limited in the present application. For example, to ensure a better out-of-band rejection, the first filter may be implemented by one or more filters in series, with the rf switch being similar.

It should be understood that the low noise amplifier, the power amplifier, the double pole double throw switch, the radio frequency switch and other modules in the radio frequency front end device disclosed by the application are not limited to the devices. For example, PA is not limited to the power amplifier device itself. The detector or the coupler and other devices can be added in the transmitting circuit, and the power amplification devices for improving the power detection function or other detection functions can be represented by using a power amplification module and also belong to the system structure protected by the application.

In addition, it is within the scope of the present application for the device circuitry to be used for matching in a module (e.g., low noise amplifier, power amplifier, double pole double throw switch, radio frequency switch, etc.). Illustratively, a capacitive or inductive device may be integrated in the low noise amplifier module, which may be generally considered to have certain filtering characteristics, and may be part of the low noise amplifier module in the present application.

With reference to the first aspect, in certain implementations of the first aspect, the receiving circuit is turned on when a first port of the first radio frequency switch is connected to a second port of the first radio frequency switch. The first port of the first radio frequency switch is connected with the antenna port and is used for inputting a received signal. The second port of the first radio frequency switch is connected with the input end of the low noise amplifier, the output end of the low noise amplifier is connected with the first port of the first filter, and the second port of the first filter is connected with the radio frequency integrated circuit and is used for outputting the received signal after filtering.

It should be noted that the filter and the radio frequency switch are functional modules, and the number of the functional modules is not particularly limited in the present application. For example, the out-of-band rejection of one filter may be insufficient, which may be achieved by two or more filters in series, with a similar rf switch.

In the device disclosed by the application, under the condition that the receiving circuit is conducted, a receiving signal sequentially passes through the antenna, the first radio frequency switch, the low-noise amplifier and the first filter and is transmitted to the radio frequency integrated circuit. The first filter is arranged at the output end of the low-noise amplifier, so that the insertion loss of the filter has little influence on the system NF, and the condition of deterioration of the system receiving sensitivity can be relieved.

With reference to the first aspect, in certain implementations of the first aspect, the apparatus further includes a power amplifier and a second filter. The first radio frequency switch is also used for conducting the transmitting circuit. When the first port of the first radio frequency switch is connected with the third port of the first radio frequency switch, the transmitting circuit is conducted. The output end of the power amplifier is connected with a first port of the second filter, a second port of the second filter is connected with a third port of the first radio frequency switch, and the first port of the first radio frequency switch is connected with the antenna port. Wherein the power amplifier is used for amplifying the transmitting signal. The second filter is used for filtering the amplified transmission signal. The antenna port is used for outputting the transmission signal after the filtering processing.

It should be appreciated that the radio frequency front end devices provided above are also applicable to transmit circuits.

In the device disclosed by the application, under the condition that the transmitting circuit is conducted, a transmitting signal is transmitted through the power amplifier, the second filter, the first radio frequency switch and the communication antenna in sequence. The second filter is arranged at the output end of the power amplifier, so that the effect of reducing the NF of the system can be achieved, and the receiving sensitivity of the system is improved.

In summary, by re-arranging and combining the plurality of filters (e.g., the first filter and the second filter), i.e., the first filter of the receiving circuit is placed at the output of the low noise amplifier and the second filter of the transmitting circuit is placed at the output of the power amplifier, the receiving sensitivity in the high frequency coexistence is improved, improving the system performance.

It should be noted that, the power amplifier in the apparatus disclosed in the present application is not limited to the power amplifier device itself. In the transmitting circuit, a detector, a coupler or other devices can be added according to the system requirement, and the power amplifier devices with the power detection function or other detection functions also belong to the radio frequency front-end device protected by the application and can be collectively called as a power amplifier module.

With reference to the first aspect, in certain implementations of the first aspect, the apparatus further includes a second radio frequency switch and a third radio frequency switch. When the first port of the first radio frequency switch is connected with the second port of the first radio frequency switch, the receiving circuit is conducted. The first port of the second radio frequency switch is connected with the second port of the second radio frequency switch, and the first port of the third radio frequency switch is connected with the second port of the third radio frequency switch. The first port of the first radio frequency switch is connected with the antenna port and is used for inputting a received signal. The second port of the first radio frequency switch is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the second port of the second radio frequency switch, the first port of the second radio frequency switch is connected with the first port of the first filter, the second port of the first filter is connected with the first port of the third radio frequency switch, and the second port of the third radio frequency switch is connected with the radio frequency integrated circuit and is used for outputting the received signal after filtering.

It will be appreciated that the device performs a function similar to two filters by controlling the internal logic. Specifically, the second radio frequency switch and the third radio frequency switch are utilized to enable the transmitting circuit and the receiving circuit to multiplex the first filter to form a complete radio frequency front-end device.

In the device disclosed by the application, under the condition that the receiving circuit is conducted, a receiving signal is transmitted to the radio frequency integrated circuit through the antenna, the first radio frequency switch, the low-noise amplifier, the second radio frequency switch, the first filter and the third radio frequency switch in sequence. The first filter is arranged at the output end of the low-noise amplifier, so that the insertion loss of the filter has little influence on the system NF, and the condition of deterioration of the system receiving sensitivity can be relieved. Meanwhile, the number of filters is reduced, and the design cost can be reduced.

With reference to the first aspect, in certain implementations of the first aspect, the first radio frequency switch is further configured to turn on the transmitting circuit. When the first port of the first radio frequency switch is connected with the third port of the first radio frequency switch, the transmitting circuit is conducted. The first port of the second radio frequency switch is connected with the third port of the second radio frequency switch, and the first port of the third radio frequency switch is connected with the third port of the third radio frequency switch. The output end of the power amplifier is connected with a third port of a third radio frequency switch, a first port of the third radio frequency switch is connected with a second port of the first filter, the first port of the first filter is connected with a first port of the second radio frequency switch, the third port of the second radio frequency switch is connected with a third port of the first radio frequency switch, and the first port of the first radio frequency switch is connected with an antenna port. Wherein the power amplifier is used for amplifying the transmitting signal. The first filter is also used for performing filter processing on the amplified transmission signal. The antenna port is used for outputting the transmission signal after the filtering processing.

In the device disclosed by the application, under the condition that the transmitting circuit is conducted, a transmitting signal is transmitted through the power amplifier, the third radio frequency switch, the first filter, the second radio frequency switch, the first radio frequency switch and the communication antenna in sequence. The first filter is arranged at the output end of the power amplifier, so that the effect of reducing the NF of the system can be achieved, and the receiving sensitivity of the system is improved.

In summary, by re-arranging the filters and re-combining the plurality of radio frequency switches (e.g., the first radio frequency switch, the second radio frequency switch, and the third radio frequency switch), multiplexing the first filter at the receiving circuit and the transmitting circuit is achieved, not only can the receiving sensitivity be improved when high frequencies coexist, but also the design cost of the system can be reduced while considering the cost problem of the filters.

With reference to the first aspect, in certain implementations of the first aspect, the apparatus further includes a double pole double throw switch. When the first port and the second port of the double-pole double-throw switch are connected, the third port and the fourth port of the double-pole double-throw switch are connected, the first port and the third port of the double-pole double-throw switch are disconnected, the second port and the fourth port of the double-pole double-throw switch are disconnected, and when the first port and the second port of the first radio frequency switch are connected, the receiving circuit is conducted. The first port of the double pole double throw switch is connected with the antenna port for inputting the received signal. The second port of the double-pole double-throw switch is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the fourth port of the double-pole double-throw switch, the third port of the double-pole double-throw switch is connected with the first port of the first filter, and the second port of the first filter is connected with the first port of the first radio frequency switch. The second port of the first radio frequency switch is connected with the radio frequency integrated circuit and is used for outputting the received signal after the filtering processing.

In the device disclosed by the application, under the condition that a receiving circuit is conducted, a receiving signal is transmitted to a radio frequency integrated circuit through a double-pole double-throw switch, a low noise amplifier, the double-pole double-throw switch, a first filter and a first radio frequency switch in sequence. The first filter is arranged at the output end of the low-noise amplifier, so that the insertion loss of the filter has little influence on the system NF, and the condition of deterioration of the system receiving sensitivity can be relieved. Meanwhile, the circuit functions of the first radio frequency switch and the second radio frequency switch are combined by utilizing the double-pole double-throw switch, so that the structure architecture is simplified. And the third radio frequency switch and the double-pole double-throw switch are utilized to enable the transmitting circuit and the receiving circuit to multiplex the first filter to form a complete radio frequency front-end device. The number of filters is reduced, and the design cost of the system is reduced.

With reference to the first aspect, in certain implementations of the first aspect, the first radio frequency switch is further configured to turn on the transmitting circuit. When the first port and the third port of the double-pole double-throw switch are connected, the first port and the second port of the double-pole double-throw switch are disconnected, the third port and the fourth port of the double-pole double-throw switch are disconnected, and the first port and the third port of the first radio frequency switch are connected, the transmitting circuit is conducted. The output end of the power amplifier is connected with a third port of the first radio frequency switch, a first port of the first radio frequency switch is connected with a second port of the first filter, the first port of the first filter is connected with a third port of the double-pole double-throw switch, and the first port of the double-pole double-throw switch is connected with an antenna port. Wherein the power amplifier is used for amplifying the transmitting signal. The first filter is also used for filtering the amplified transmission signal. The antenna port is used for outputting the transmission signal after the filtering processing.

In the device disclosed by the application, under the condition that a transmitting circuit is conducted, a transmitting signal is transmitted through the power amplifier, the first radio frequency switch, the first filter, the double-pole double-throw switch and the communication antenna in sequence. The first filter is arranged at the output end of the power amplifier, so that the effect of reducing the NF of the system can be achieved, and the receiving sensitivity of the system is improved.

In a word, to the filter re-layout, and to the radio frequency switch and double-pole double-throw switch recombination, not only can retrench the system architecture, realize multiplexing first filter at receiving circuit and transmitting circuit, can also promote the receiving sensitivity when high frequency coexists, reduce the design cost of system.

In a second aspect, a signal processing method is provided. The method comprises the following steps: the radio frequency front-end device receives the first electric signal, amplifies the first electric signal, and filters the amplified first electric signal.

With reference to the second aspect, in some implementations of the second aspect, the radio frequency front end device amplifies the second electrical signal, filters the amplified second electrical signal, and transmits the filtered second electrical signal.

In the method disclosed by the application, in a receiving circuit, the received first electric signal is amplified and filtered in sequence. And in the transmitting circuit, amplifying and filtering the second electric signal to be transmitted in sequence. The method can avoid the problems of receiving sensitivity deterioration and the like caused by mutual interference between the first electric signal and the second electric signal, thereby reducing the system NF and improving the system performance.

In a third aspect, a radio frequency front-end device is provided, comprising a transceiver, a processor for controlling the transceiver to transceive signals, and a memory for storing a computer program, the processor being adapted to invoke and run the computer program from the memory, such that the radio frequency front-end device performs the method of the second aspect or any of the possible implementations of the second aspect.

Optionally, the processor is one or more and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

Optionally, the radio frequency front end device further comprises a transmitter (transmitter) and a receiver (receiver).

In a fourth aspect, a radio frequency front end system is provided. The system comprises: a communication antenna, a radio frequency integrated circuit, and a radio frequency front end device in the first aspect or any one of the possible implementations of the first aspect.

In a fifth aspect, a computer-readable storage medium is provided. The computer readable medium stores program code for execution by a device, the program code comprising instructions for performing the method provided in the second aspect described above.

In a sixth aspect, a computer program product comprising instructions is provided. The computer program product, when run on a computer, causes the computer to perform the method provided in the second aspect described above.

In a seventh aspect, a chip is provided that includes a processor and a communication interface. The processor reads the instructions stored on the memory through the communication interface and performs the method provided in the second aspect.

Optionally, as an implementation, the chip may further include a memory. The memory has instructions stored therein, the processor being configured to execute the instructions stored thereon, the processor, when executed, being configured to perform the method provided in the second aspect described above.

Drawings

Fig. 1 is a schematic diagram of the internal structure of the rf front-end module FEM.

Fig. 2 is a schematic diagram of WiFi spectrum.

Fig. 3 is a schematic diagram of dual frequency operation interference between WiFi 5GHz and 6 GHz.

Fig. 4 is a schematic diagram of a structure in which 5GHz and 6GHz bands coexist in a conventional WiFi three frequency system.

Fig. 5 is a schematic structural diagram of a 5GHz band receiving end of a WiFi three frequency system according to an embodiment of the application.

Fig. 6 is a schematic structural diagram of a radio frequency front end device according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of another rf front-end device according to an embodiment of the present application.

Fig. 8 is a schematic structural diagram of another rf front-end device according to an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a double pole double throw switch according to an embodiment of the present application.

Fig. 10 is a schematic flow chart of a signal processing method according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of a radio frequency front end system according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

In general, a radio frequency front end system includes a communication antenna, a FEM, a radio frequency transceiver module, and a baseband signal processor. The FEM is a core component of a wireless communication device, and is a basic component for converting a wireless electromagnetic wave signal and a digital signal into each other.

Fig. 1 is a schematic diagram of the internal 100 structure of the FEM. As shown in fig. 1, the rf front-end module may be functionally divided into a Transmit (TX) end and a Receive (RX) end. The radio frequency front end mode components may be divided into a Power Amplifier (PA), a low frequency noise amplifier (Low noise amplifier, LNA), a Switch (SW), and the like according to constituent devices.

Specifically, the PA is used to amplify the transmit signal input from the TX. The LNA is used for low noise amplification of a received signal input from an antenna hardware interface (antenna hardware interface, ANT). It should be appreciated that the LNA has a bypass (bypass) mode and an LNA mode. SW is used for ANT selection to turn on the transmitting circuit or the receiving circuit, i.e. for switching between the receiving circuit and the transmitting circuit.

The output end of the PA is connected with the port 3 of the SW, the port 1 of the SW is connected with the ANT, and the port 2 of the SW is connected with the input end of the LNA. When transmitting signals, SW selects the upper radio frequency path (i.e. through), i.e. port 1 and port 3 of SW are connected. At this time, the complete path of the transmitted signal is: TX→PA→SW→ANT. Upon receiving the signal, SW selects the following radio frequency path, i.e. port 1 and port 2 of SW are connected. At this time, the complete path of the received signal is: ant→sw→lna→rx.

It should be appreciated that the WiFi circuitry includes a WiFi chip, FEM and ANT. With the continuous integration of radio frequency devices, conventional discrete devices such as LNA, PA, SW, etc. are gradually integrated into one FEM device. For dual-frequency systems (e.g., supporting the 2.4ghz+5ghz band), the WiFi chip and FEM may constitute board-level circuitry and radiate and receive signals through the ANT.

With the rapid development of communication technology, wiFi 6 based on 2.4GHz and 5GHz frequency bands is widely used. Meanwhile, in the certification road sign of the WiFi alliance (WFA), the 6G band characteristic, i.e., wiFi 6E, is clearly defined. Compared with WiFi 6, wiFi 6E is mainly different in that a 6GHz frequency band is added on the basis of the original frequency band.

Fig. 2 is a schematic diagram of WiFi spectrum. As shown in fig. 2, the 2.4GHz band corresponds to 2400MHz to 2483.5MHz, and the supported channel bandwidths include 20MHz and 40MHz. The 5GHz band corresponds to 5150MHz to 5850MHz or 5895MHz (new spectrum), and the supported channel bandwidths include 20MHz, 40MHz, 80MHz and 160MHz. The 6GHz band newly added by the WiFi 6E corresponds to 5925MHz to 7125MHz, and compared with the 5GHz band, the frequency band also supports 320MHz channel bandwidth.

By way of example, when using a system supporting WiFi 6E, frequency bands of 2.4GHz and 5GHz may be allocated to devices that are not high in performance requirements, while frequency bands of 6GHz may be allocated to devices that are high in performance requirements, thereby meeting the requirements of different devices.

Considering that the WiFi 5GHz high frequency signal and the WiFi 6GHz low frequency signal have only 110MHz intervals in frequency, when the two frequency bands of one system work simultaneously, if no precautions are taken, the problem of coexistence interference between the WiFi 5GHz and WiFi 6GHz signals may occur.

Fig. 3 is a schematic diagram of the mutual interference between WiFi 5GHz and 6GHz dual frequency operation. As shown in fig. 3, the TX center frequency point of 5825MHz,WiFi 6GHz for WiFi 5GHz is 5945MHz,WiFi 6GHz and the antenna isolation of 5GHz is 15dB. Taking WiFi 6GHz operating in a transmitting mode and WiFi 5GHz operating in a receiving mode as an example, the interference signal generated during WiFi 6GHz transmitting is too strong, so that WiFi 5GHz receiving is blocked, and the sensitivity of the receiving signal is deteriorated. In addition, the out-of-band noise floor (i.e., the dashed line portion) of the WiFi 6GHz transmission system falls well within the receiver band of WiFi 5GHz, also resulting in a deterioration in sensitivity of the WiFi 5GHz received signal.

Table 1 shows the relationship between WiFi 5GHz RX sensitivity and WiFi 6GHz TX signal interference. As shown in table 1, when no interference signal is generated at WiFi 6GHz, the receiving sensitivity corresponding to a WiFi 5GHz RX center frequency point of 5825MHz is-79 dBm. When the WiFi 6GHz interference signal is (power is-30 dBm, frequency is 5955 MHz), the WiFi 5GHz receiving sensitivity is-53 dBm, and the sensitivity worsens by more than 20dBm.

TABLE 1

It should be appreciated that the receive sensitivity is generally dependent on out-of-band background noise, demodulation signal-to-noise ratio, and system equivalent noise figure NF. Under the condition that the magnitudes of the out-of-band noise and the demodulation signal-to-noise ratio are unchanged, the receiving sensitivity and the system NF are in negative correlation. That is, the larger the NF, the worse the system performance, and the lower the reception sensitivity. Therefore, the embodiment of the application can further determine the receiving sensitivity of the signal by calculating the equivalent noise coefficient of the system.

Illustratively, a cascade circuitry includes N stages of circuits, each stage having NF and gain (G), the equivalent noise figure of the system satisfies:

wherein NF is _total Is the equivalent noise figure of the cascaded circuitry. NF1 is the first stage circuitG1 is the gain of the first stage circuit. NF2 is the equivalent noise figure of the second stage circuit, and G2 is the gain of the second stage circuit. NF3 is the equivalent noise figure of the third stage circuit and G3 is the gain of the third stage circuit. By analogy, NFn is the equivalent noise figure of the nth stage circuit and Gn is the gain of the nth stage circuit.

By way of example, table 2 is a result of parameter analysis of various devices in a 5GHz band RX circuit in a dual-frequency system, taking a conventional WiFi dual-frequency system (e.g., supporting the 2.4ghz+5ghz band). Wherein the RX circuit comprises SW, LNA and radio frequency integrated circuit (radio frequency integrated circuit, RFIC) devices. The complete path of the received signal is: ant→sw→lna→rfic.

Specifically, as shown in Table 2, the NF of SW is 1dB and G is-1 dB. The NF of LNA is 1dB and G is 15dB. The NF of RFIC is 4dB and G is 40dB. The NF of the whole system is 2.16dB, and the gain G is 54dB.

TABLE 2

Currently, conventional WiFi tri-band systems (e.g., supporting the 2.4ghz+5ghz+6ghz band) include FEM, filters, and antennas. The filter is arranged between the FEM and the antenna and is used for filtering the transmitted signal and the received signal, so that unnecessary frequency components are greatly attenuated, specific frequency components in the signal pass through, and the anti-interference performance and the signal-to-noise ratio of the signal are improved.

Fig. 4 is a schematic diagram of a structure in which 5GHz and 6GHz bands of a conventional three-frequency system coexist. It should be appreciated that the 5GHz and 6GHz bands employ the same circuit architecture. As shown in fig. 4 (a), the FEM and filter of the three-frequency system are distributed. As shown in fig. 4 (b), the filters of the three-frequency system are integrated into the FEM to form a new FEM.

Taking WiFi 5GHz as an example in a transmitting state, TX signals are amplified by FEM and then pass through a filter, so that out-of-band spurious signals are suppressed, namely spurious signals of a main signal in a 6GHz frequency band are weakened by the filter. Based on the interference mechanism described in fig. 3 above, the WiFi 6GHz receive circuit has less interference.

Similarly, for WiFi 6GHz to operate in a transmit state, the receive circuitry of WiFi 5GHz is less interfering.

Specifically, fig. 4 (c) shows a schematic diagram of the internal structure of the new FEM in fig. 4 (b). In contrast to the FEM shown in fig. 1, the interior of the new FEM also comprises a filter. The filter is placed between SW and ANT for suppressing out-of-band spurious signals of the received signal. The function of other devices can be seen in fig. 1, and will not be described here again.

Illustratively, when transmitting signals, SW selects the upper radio frequency path (i.e., through), i.e., port 1 and port 3 of SW are connected. At this time, the complete path of the transmitted signal is: TX, PA, SW, filter, ANT. Upon receiving the signal, SW selects the following radio frequency path, i.e. port 1 and port 2 of SW are connected. At this time, the complete path of the received signal is: ant→filter→sw→lna→rx.

Illustratively, taking a conventional WiFi tri-band system (e.g., supporting 2.4ghz+5ghz+6ghz) as an example, table 3 is a result of parameter analysis of each device in the 5GHz band RX circuit in the tri-band system. Wherein the RX circuit comprises a filter (filter), SW, LNA and RFIC devices. The complete path of the received signal is: ant→filter→sw→lna→rfic.

Specifically, as shown in Table 3, the NF of the filter was 3dB and G was-3 dB. The NF of SW is 1dB and G is-1 dB. The NF of LNA is 1dB and G is 15dB. The NF of RFIC is 4dB and G is 40dB. The NF of the whole system is 5.16dB, and the gain G is 51dB.

TABLE 3 Table 3

From the data in tables 2 and 3, it can be seen that NF and G of the conventional three-frequency system (2.4ghz+5ghz+6ghz) are reduced by 3dB compared with the conventional two-frequency system (2.4ghz+5ghz), thereby causing degradation of the system by more than 3dB in receiving sensitivity. This is because the filter is placed at the common end of the transmit and receive circuits, and especially for RX, the system NF needs to add a filter insertion loss, which is typically around 3dB.

Therefore, there is a need to solve the problem of reduced system receiving sensitivity caused by coexistence of 5GHz and 6GHz bands in a three-frequency system.

In view of this, the present application provides a radio frequency front end device and a signal processing method, which realize the effect of zero desensitization of the receiving sensitivity by re-arranging the filters and re-combining one or more filters or radio frequency switches, thereby improving the system performance. Meanwhile, the device disclosed by the application reduces the number of filters and simplifies the system architecture, so that the system design cost is reduced and the system performance is improved.

In order to facilitate understanding of the embodiments of the present application, the following description is made:

in various embodiments of the application, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.

In embodiments of the present application, "plurality" may refer to two or more.

It should be understood that the "first", "second" and various numerical numbers in the embodiments shown below are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. The sequence numbers of the processes below do not mean the sequence of execution, and the execution sequence of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present application.

In the embodiment of the application, the descriptions of "when … …", "in the case of … …" and the like all refer to that the device will perform corresponding processing under some objective condition, and are not limited in time, nor do the device require a judging action in implementation, nor are other limitations meant to exist.

The technical scheme provided by the application will be described in detail below with reference to the accompanying drawings.

Fig. 5 is a schematic diagram of a 5GHz band RX circuit 500 of a WiFi three frequency system according to an embodiment of the application. As shown in fig. 5, the RX circuit includes a first radio frequency switch, a low noise amplifier, and a first filter.

Optionally, the RX circuit further comprises a communication antenna and a radio frequency integrated circuit.

The communication antenna is connected with a first port of the first radio frequency switch, a second port of the first radio frequency switch is connected with a receiving end of the low noise amplifier, an output end of the low noise amplifier is connected with a first port of the first filter, and a second port of the first filter is connected with the radio frequency integrated circuit. I.e. the complete path of the received signal is: communication antenna- & gtfirst radio frequency switch- & gtlow noise amplifier- & gtfirst filter- & gtradio frequency integrated circuit.

Specifically, the first radio frequency switch is used for conducting the receiving circuit. The low noise amplifier is used for amplifying the received signal with low noise. The first filter is used for suppressing spurious signals outside the band and filtering the amplified received signals.

Table 4 shows the results of the parameter analysis for each device of the RX circuit. As shown in Table 4, the NF of the first RF switch SW is 1dB and G is-1 dB. The NF of the low noise amplifier LNA is 1dB and G is 15dB. The NF of the first filter (filter) was 3dB and G was-3 dB. The NF of the radio frequency integrated circuit RFIC is 4dB and g is 40dB. The overall system NF was 2.42dB and G was 51B.

TABLE 4 Table 4

By comparison, the NF (2.42) of the radio frequency front end device disclosed by the application is slightly larger than the NF (2.16) of the dual-frequency system and is far smaller than the NF (5.16) of the three-frequency system. That is, the system performance realized by the radio frequency front-end device is similar to that of a dual-frequency system and is obviously superior to that of a three-frequency system. The receive sensitivity of the rf front-end device is reduced by only 0.26dB relative to the dual-frequency system.

One possible implementation way, when the gain G of the low noise amplifier is increased to 20dB, the corresponding overall system NF can reach 2.13dB, which is even slightly better than 2.16dB of the conventional dual-frequency system, so as to better improve the receiving sensitivity and improve the system performance.

Fig. 6 is a schematic structural diagram of a radio frequency front-end device 600 according to an embodiment of the present application. As shown in fig. 6, the apparatus includes: ANT (i.e., one example of a communication antenna), PA (i.e., one example of a power amplifier), filter (e.g., filter 0 and filter 1), LNA (i.e., one example of a low noise amplifier), and SW (i.e., one example of a first radio frequency switch).

Optionally, the radio frequency front end device further comprises an ANT and an RFIC.

The SW is used for conducting the transmitting circuit and also used for conducting the receiving circuit. I.e. SW is used for switching between the receiving circuit and the transmitting circuit.

When port 1 of SW is connected to port 2, the receiving circuit is turned on. At this time, the ANT is connected to the port 1 of the SW for inputting a reception signal. Port 2 of SW is connected to the input of the LNA, which is used for low noise amplification of the received signal. The output of the LNA is connected to port 1 of filter 0 (i.e., an example of the first filter), i.e., filter 0 is located at the output of the LNA, for filtering the amplified received signal. Port 2 of filter 0 is used to output the filtered signal #2 (i.e., an example of the received signal) to the RFIC. Then the complete path of the received signal #2 is ant→sw→lna→filter 0→rx.

When port 1 of SW is connected to port 3, the transmit circuit is on. At this time, the output of the PA is connected to port 1 of filter 1 (i.e., one example of the second filter), i.e., filter 1 is located at the output of the PA. The PA is used to amplify the signal #1 (i.e., an example of a transmission signal), and the filter 1 is used to filter the amplified transmission signal #1. Port 2 of the filter 1 is connected to port 3 of the SW, and port 1 of the SW is connected to the ANT, and outputs the filtered transmission signal #1. Then the complete path of the transmit signal #1 is tx→pa→filter 1→sw→ant.

Filter 0 and filter 1 may be dielectric filters or baw filters, for example, and the application is not limited thereto. It will be appreciated that the size of the dielectric filter is relatively large, typically around 10mm in length, while the size of the baw filter is relatively small, typically within 2mm in length.

It should be noted that, the filter 0 and the filter 1 are independent devices, and a filter with a suitable specification may be selected according to the actual requirement (for example, the in-band interpolation loss and the out-of-band suppression degree) of the TX circuit or the RX circuit where the filter is located.

Specifically, taking a 5GHz band RX structure as an example, an electrical signal received by an ANT sequentially passes through SW, LNA and filter 1 and then enters an RFIC. Referring to equation (1) and table 4, the system NF does not drop substantially because the filter 0 is placed at the output of the LNA, rather than at the very front of the signal reception. The calculation of the overall system NF needs to be divided by the gain of the active device (i.e., LNA) closer to the ANT, so the in-band interpolation loss of filter 0 has little impact on the system NF. Meanwhile, the TX end is also provided with an independent filter 1, and the specification of the filter 1 can be determined according to the spurious requirements of a transmitting circuit and the signal strength requirements of a different-frequency receiving side (for example, 6 GHz), so that the receiving sensitivity and the system performance of the system are improved.

Similarly, the 6GHz band RX structure is similar to the 5GHz band RX structure, and the effect of reducing the system NF can be achieved. For brevity, no further description is provided herein.

It should be understood that the above filters and the radio frequency switch are functional modules, and the number thereof is not particularly limited by the present application. For example, when the out-of-band rejection effect of one filter is poor, it can be achieved by connecting two or more filters in series, and the rf switch is similar.

Note that SW in the structure disclosed in the present application refers to a radio frequency switch having a function of selecting a path. It should be understood that SW with a function of 1-2 in this implementation is only exemplary, and should not constitute any limitation on the technical solution of the present application. For example, a 1-select 3, or 1-select 4, or 1-select n radio frequency switch that can also implement the 1-select 2 function is also a system structure protected by the present application.

It should be further noted that the PA in the radio frequency front-end device disclosed in the present application is not limited to the power amplifier device itself. The detector or the coupler and other devices can be added in the transmitting circuit, and the power amplification devices for improving the power detection function or other detection functions can be represented by using a power amplification module and also belong to the system structure protected by the application.

Fig. 7 is a schematic structural diagram of another rf front-end device 700 according to an embodiment of the present application. As shown in fig. 7, the apparatus includes: ANT (i.e., one example of a communication antenna), PA (i.e., one example of a power amplifier), filter (i.e., one example of a first filter), LNA (i.e., one example of a low noise amplifier), and SW (e.g., SW0, SW1, and SW 2), the filter being located between SW1 and SW 2. With respect to the configuration shown in fig. 6, the transmit and receive circuits are multiplexed with filters using SW1 and SW2 switches to form a complete radio frequency front-end device (e.g., FEM).

When port 1 of SW0 (i.e., one example of the first radio frequency switch) is connected to port 2, port 1 of SW1 (i.e., one example of the second radio frequency switch) is connected to port 2, port 1 of SW2 (i.e., one example of the third radio frequency switch) is connected to port 2, the receiving circuit is turned on. At this time, the ANT is connected to the port 1 of SW0 for inputting a reception signal. Port 2 of SW0 is connected to the input of the LNA, which is used for low noise amplification of the received signal. The output end of the LNA is connected with the port 2 of the SW1, the port 1 of the SW1 is connected with the port 1 of the filter, namely the filter is positioned at the output end of the LNA and is used for filtering the amplified received signal. Port 2 of the filter is connected to port 1 of SW2, and port 2 of SW2 is used to output the filtered signal #b (i.e., an example of the received signal) to the RFIC. Then, the complete path of the received signal #b is ant→sw0→lna→sw1→filter→sw2→rx.

When port 1 of SW0 is connected to port 3, port 1 of SW1 is connected to port 3, and port 1 of SW2 is connected to port 3, the transmitting circuit is turned on. At this time, the output terminal of the PA is connected to the port 3 of the SW2, and the PA is used to amplify the signal #1 (i.e., an example of the transmission signal). Port 1 of SW2 is connected to port 2 of the filter and port 1 of the filter is connected to port 1 of SW1, i.e. the filter is at the output of the PA and between SW1 and SW 2. The filter 1 is configured to filter the amplified signal #a. Port 3 of SW1 is connected to port 3 of SW0, and port 1 of SW0 is connected to ANT, and outputs a filtered signal #a. Then, the complete path of the transmit signal #a is tx→pa→sw2→filter→sw1→sw0→ant.

Specifically, taking a 5GHz band RX structure as an example, an electrical signal received by an ANT sequentially passes through SW0, LNA, SW1, a filter and SW2 and then enters an RFIC. Referring to equation (1) and table 4, the system NF is not substantially degraded because the filter is placed at the output of the LNA and its in-band insertion loss has little effect on the system NF. At the same time, SW is cheaper than a filter, multiplexing of the filter is achieved by adding switches (e.g., SW1 and SW 2), and thus system design cost is reduced. It will be appreciated that this is mainly achieved by controlling the internal logic, i.e. when in TX state the filter is at the output of the PA, port 1 and port 3 of SW0 are connected, port 1 and port 3 of SW1 are connected, and port 1 and port 3 of SW2 are connected. When in the RX state, the filters are at the output of the LNA, port 2 of SW0 is connected to port 1, port 1 of SW1 is connected to port 2, and port 1 of SW2 is connected to port 2 to achieve a function similar to two filters.

In the implementation mode, the SW0 and the SW1 are utilized to enable the transmitting circuit and the receiving circuit to multiplex the filters, so that the number of the filters is reduced, and the design cost is reduced.

Fig. 8 is a schematic structural diagram of yet another rf front-end device 800 according to an embodiment of the present application. As shown in fig. 8, the apparatus includes: ANT (i.e., one example of a communication antenna), PA (i.e., one example of a power amplifier), filter (i.e., one example of a first filter), LNA (i.e., one example of a low noise amplifier), SW0 (i.e., one example of a first radio frequency switch), and double-pole double-throw (DPDT), the filter being located between SW0 and DPDT. With respect to the configuration shown in fig. 7, the circuit functions of SW0 and SW1 are combined, and the transmit circuit and the receive circuit are multiplexed with the filter using SW and DPDT to form a complete radio frequency front end device (e.g., FEM).

Fig. 9 is a schematic structural diagram of a DPDT circuit architecture according to an embodiment of the present application. As shown in fig. 9, the DPDT includes ports 1, 2, 3 and 4, and the circuit logic of the DPDT includes the following two cases.

One possible implementation, when in TX state, is port 1 and port 3 connected, port 2 and port 4 connected, port 1 and port 2 disconnected, and port 3 and port 4 disconnected. When in RX state, port 1 and port 2 are connected, port 3 and port 4 are connected, port 1 and port 3 are disconnected, and port 2 and port 4 are disconnected.

In another possible implementation, when in TX state, port 1 and port 3 are on, port 2 and port 4 are off, port 1 and port 2 are off, and port 3 and port 4 are off. When in RX state, port 1 and port 2 are connected, port 3 and port 4 are connected, port 1 and port 3 are disconnected, and port 2 and port 4 are disconnected.

It should be noted that the main difference between the above two circuit logics is: when in TX state, port 2 and port 4 are in communication. For example, port 2 and port 4 are connected, and since the LNA is in bypass (bypass) state, there is no effect on the connection of port 1 and port 3. Alternatively, port 2 and port 4 are disconnected, at which time whether the LNA bypass state has no effect on the communication between port 1 and port 3. Thus, whether port 2 and port 4 are in communication has no effect on TX.

It should be noted that, in the structure disclosed in the present application, DPDT refers to a radio frequency switch having a function of selecting a channel. It should be understood that the DPDT with 2-2 function in this implementation is only exemplary, and should not constitute any limitation on the technical solution of the present application. For example, a 2-by-3, or 2-by-4, or 2-by-n, or 3-by-2, or 4-by-2, or n-by-2 multiple pole multiple throw switch, which can also implement the 2-by-2 function, is also a system structure protected by the present application.

When the DPDT selects the RX logic described in fig. 9, i.e., port 1 and port 2 of the DPDT are connected, port 3 and port 4 are connected, port 1 and port 3 are disconnected, and port 2 and port 4 are disconnected. And when port 1 of SW is connected to port 2, the receiving circuit is turned on. At this time, ANT is connected to port 1 of the DPDT and is used for inputting a reception signal. Port 2 of the DPDT is connected to the input of the LNA, which is used to low noise amplify the received signal. The output end of the LNA is connected with a port 4 of the DPDT, and a port 3 of the DPDT is connected with a port 1 of the filter, namely the filter is positioned at the output end of the LNA and is used for filtering the amplified received signal. Port 2 of the filter is connected to port 1 of the SW, and port 2 of the SW is used to output the filtered signal #b (i.e., an example of the received signal) to the RFIC. Then the complete path of the received signal #b is: ant→dpdt (port 1 and port 2 are connected) →lna→dpdt (port 3 and port 4 are connected) →filter→sw0→rx.

When the DPDT selects the TX logic described in fig. 9, i.e. port 1 of the DPDT is connected to port 3, port 1 of the DPDT is disconnected from port 2, and port 3 of the DPDT is disconnected from port 4. And when port 1 of SW is connected with port 3, the transmit circuit is turned on. At this time, the output terminal of the PA is connected to the port 3 of the SW, and the PA is used to amplify the signal #a (i.e., an example of the transmission signal). Port 1 of SW is connected to port 2 of the filter, i.e. the filter is at the output of the PA and between SW and DPDT. The filter is used for filtering the amplified signal #A. Port 1 of the filter is connected to port 3 of the DPDT, and port 1 of the DPDT is connected to the ANT, and outputs the filtered signal #a. Then the complete path of the transmit signal #a is: TX→PA→SW0→Filter→DPDT (port 1 and port 3 are in communication) →ANT.

Specifically, taking a 5GHz band RX structure as an example, an electrical signal received by the ANT sequentially passes through the DPDT (port 1 and port 2 are communicated), the LNA, the DPDT (port 3 and port 4 are communicated), the filter and the SW, and then enters the RFIC. Referring to equation (1) and table 4, the system NF is not substantially degraded because the filter is placed at the output of the LNA and its in-band insertion loss has little effect on the system NF. Meanwhile, SW is cheaper than a filter, and partial switches are combined (i.e., SW0 and SW1 are combined into DPDT) on the basis of the structure shown in fig. 7, so as to achieve the effect of simplifying the rf front-end architecture. Multiplexing of the filter is achieved through the radio frequency switch SW and the DPDT, and therefore system design cost is reduced. It will be appreciated that this is mainly achieved by controlling the internal logic, i.e. when in TX state the filter is at the output of the PA, port 1 and port 3 of SW are connected and port 1 and port 3 of DPDT are in communication. I.e. when in RX state, the filters are at the output of the LNA, port 1 and port 2 of the DPDT are in communication, port 3 and port 4 are in communication, and port 1 and port 2 of the SW are connected to achieve a function similar to two filters.

In the implementation mode, the SW and the DPDT are utilized to enable the transmitting circuit and the receiving circuit to multiplex the filter, so that the system architecture is simplified, and the design cost is reduced.

It should be noted that the FEM shown in fig. 6 to 8 is only an exemplary illustration, and should not be construed as limiting the technical solution of the present application. It should be appreciated that the FEM may be an integrated radio frequency front end chip structure. Alternatively, each device (e.g., PA, SW, LNA, filter, etc.) in the FEM is an independent chip structure, i.e., the FEM is a distributed radio frequency front end structure.

In summary, the system structure disclosed by the application can improve the receiving sensitivity of the high frequency part (e.g. 5GHz and 6 GHz) of the system (e.g. 2.4GHz+5GHz+6GHz), especially solve the signal interference caused by the coexistence of the 5GHz and 6GHz frequency bands, improve the frequency band coexistence capability, reduce the system sensitivity deterioration, improve the system performance and the like.

Further, by highly integrating the rf front-end, particularly the integration of a miniaturized filter, 30% of the rf area can be saved, thereby reducing the chip and circuit area and hardware cost.

Finally, the system structure disclosed by the application can realize the consistency of radio frequency performance, simplifies chip system design and board-level wiring by a board-level integration scheme behind a chip packaging technology, reduces the number of pins of a chip, and further reduces radio frequency interference. Meanwhile, due to the simplified radio frequency front end design, consistency among channels and multiple input multiple output (multiple input multiple output, MIMO) performance can be improved.

It should be noted that, the structure disclosed in the present application is exemplified by a three-frequency system of 2.4ghz+5ghz+6ghz, and should not be construed as limiting the technical solution of the present application. The structure disclosed by the application is also applicable to other three-frequency systems, such as a system with coexistence of 2.4G+5GL (5150-5350 MHz) +5GH (5470-5850 MHz) frequency bands.

Fig. 10 is a flowchart of a signal processing method 1000 according to an embodiment of the present application, which specifically includes the following steps.

The signal processing method is applicable to a receiving circuit and a transmitting circuit. Steps S1010 to S1030 are applicable to the receiving circuit, and steps S1040 to S1060 are applicable to the transmitting circuit.

S1010, the radio frequency front-end device receives a first electrical signal.

It should be appreciated that the first electrical signal may be in the form of a current or a voltage. The frequency of the first electrical signal may be an operating frequency of WiFi. For example, 2.4GHz, 5GHz or 6GHz, which is not particularly limited by the application.

S1020, the radio frequency front end device amplifies the first electrical signal.

Illustratively, the voltage or current of the first electrical signal is amplified.

S1030, the radio frequency front-end device performs filtering processing on the amplified first electric signal.

S1040, the radio frequency front-end device amplifies the second electrical signal.

It should be appreciated that the second electrical signal may be in the form of a current or a voltage. The frequency of the first electrical signal may be an operating frequency of WiFi. For example, 2.4GHz, 5GHz or 6GHz, which is not particularly limited in the present application

Illustratively, the voltage or current of the second electrical signal is amplified.

S1050, the radio frequency front-end device performs filtering processing on the amplified second electric signal.

S1060, the radio frequency front end device transmits the filtered second electric signal.

In the method disclosed by the application, in a receiving circuit, the received first electric signal is amplified and filtered in sequence. And in the transmitting circuit, amplifying and filtering the second electric signal to be transmitted in sequence. According to the method, the equivalent noise coefficient of the system can be reduced by amplifying and then filtering the first electric signal and the second electric signal, so that the problems of receiving sensitivity deterioration and the like caused by mutual interference between receiving and transmitting signals are avoided, and the system performance is remarkably improved.

It should be appreciated that any of the implementations of the apparatus 600-800 described above may be used to perform the radio frequency front end method described in fig. 10.

Fig. 11 is a schematic structural diagram of a rf front-end system 1100 according to an embodiment of the present application. As shown in fig. 11, the system includes a radio frequency integrated circuit RFIC, a radio frequency front end device FEM, and a communication antenna ANT.

The RFIC is used for converting an electric signal to be transmitted or a received electric signal subjected to filtering processing into a signal frequency in a radio frequency range. The FEM is configured to perform the signal processing method described in fig. 10, and detailed implementation is not repeated. The layout and functions of the modules such as PA, LNA, and filter in the FEM can be seen in fig. 5 to 8, and will not be described here again. The ANT is used for receiving the first electric signal and transmitting the second electric signal after amplification and filtering.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone system, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or a part of the technical solution in the form of a software system stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A radio frequency front end device, characterized in that the device comprises a low noise amplifier, a first radio frequency switch and a first filter, the output end of the low noise amplifier is connected with the first filter, wherein:

the first radio frequency switch is used for conducting the receiving circuit;

the low noise amplifier is used for amplifying the received signal with low noise;

the first filter is configured to perform filtering processing on the amplified received signal.

2. The apparatus of claim 1, wherein the device comprises a plurality of sensors,

when the first port of the first radio frequency switch is connected with the second port of the first radio frequency switch, the receiving circuit is conducted;

the first port of the first radio frequency switch is connected with an antenna port and is used for inputting the received signal;

the second port of the first radio frequency switch is connected with the input end of the low noise amplifier, the output end of the low noise amplifier is connected with the first port of the first filter, and the second port of the first filter is connected with the radio frequency integrated circuit and is used for outputting the received signal after filtering.

3. The apparatus of claim 1 or 2, further comprising a power amplifier and a second filter, the first radio frequency switch further configured to turn on a transmit circuit;

When the first port of the first radio frequency switch is connected with the third port of the first radio frequency switch, the transmitting circuit is conducted;

the output end of the power amplifier is connected with the first port of the second filter, the second port of the second filter is connected with the third port of the first radio frequency switch, and the first port of the first radio frequency switch is connected with the antenna port, wherein:

the power amplifier is used for amplifying the transmitting signal;

the second filter is used for filtering the amplified transmitting signal;

and the antenna port is used for outputting the transmission signal after the filtering processing.

4. The apparatus of claim 1, further comprising a second radio frequency switch and a third radio frequency switch,

the first port of the second radio frequency switch is connected with the second port of the second radio frequency switch, the first port of the third radio frequency switch is connected with the second port of the third radio frequency switch, the first port of the first radio frequency switch is connected with an antenna port for inputting the receiving signal, the second port of the first radio frequency switch is connected with the input end of the low noise amplifier, the output end of the low noise amplifier is connected with the second port of the second radio frequency switch, the first port of the second radio frequency switch is connected with the first port of the first filter, the second port of the first filter is connected with the first port of the third radio frequency switch, and the second port of the third radio frequency switch is connected with a radio frequency integrated circuit for outputting the receiving signal after filtering.

5. The apparatus of claim 1 or 4, wherein the first radio frequency switch is further configured to turn on a transmit circuit;

the first port of the second radio frequency switch is connected with the third port of the second radio frequency switch, the first port of the third radio frequency switch is connected with the third port of the third radio frequency switch, the output end of the power amplifier is connected with the third port of the third radio frequency switch, the first port of the third radio frequency switch is connected with the second port of the first filter, the first port of the first filter is connected with the first port of the second radio frequency switch, the third port of the second radio frequency switch is connected with the third port of the first radio frequency switch, the first port of the first radio frequency switch is connected with the antenna port, wherein:

the power amplifier is used for amplifying the transmitting signal;

the first filter is further used for performing filter processing on the amplified transmitting signal;

6. The device of claim 1, further comprising a double pole double throw switch,

when a first port and a second port of the double-pole double-throw switch are connected, a third port and a fourth port of the double-pole double-throw switch are connected, the first port and the third port of the double-pole double-throw switch are disconnected, the second port and the fourth port of the double-pole double-throw switch are disconnected, and when the first port and the second port of the first radio frequency switch are connected, the receiving circuit is conducted;

the first port of the double-pole double-throw switch is connected with an antenna port and is used for inputting the received signal;

the second port of the double-pole double-throw switch is connected with the input end of the low-noise amplifier, the output end of the low-noise amplifier is connected with the fourth port of the double-pole double-throw switch, the third port of the double-pole double-throw switch is connected with the first port of the first filter, the second port of the first filter is connected with the first port of the first radio frequency switch, and the second port of the first radio frequency switch is connected with the radio frequency integrated circuit and is used for outputting the received signal after filtering.

7. The apparatus of claim 6, wherein the first radio frequency switch is further configured to turn on a transmit circuit;

when a first port and a third port of the double-pole double-throw switch are connected, the first port and the second port of the double-pole double-throw switch are disconnected, the third port and the fourth port of the double-pole double-throw switch are disconnected, and when the first port of the first radio frequency switch is connected with the third port of the first radio frequency switch, the transmitting circuit is conducted;

the output end of the power amplifier is connected with the third port of the first radio frequency switch, the first port of the first radio frequency switch is connected with the second port of the first filter, the first port of the first filter is connected with the third port of the double pole double throw switch, and the first port of the double pole double throw switch is connected with an antenna port, wherein:

the power amplifier is used for amplifying the transmitting signal;

the first filter is further used for filtering the amplified transmitting signal;

8. A signal processing method, comprising:

The radio frequency front-end device receives a first electric signal;

the radio frequency front-end device amplifies the first electric signal;

the radio frequency front-end device carries out filtering processing on the amplified first electric signal.

9. The method of claim 8, wherein the method further comprises:

the radio frequency front-end device amplifies the second electric signal;

the radio frequency front-end device carries out filtering treatment on the amplified second electric signal;

the radio frequency front-end device transmits the second electric signal after the filtering processing.

10. A radio frequency front end system, comprising: communication antenna, radio frequency integrated circuit and radio frequency front end device according to any of claims 1 to 7.