Receiving circuit, radio frequency system and communication equipment

Abstract

The invention relates to a receiving circuit, a radio frequency system and communication equipment, and the receiving circuit comprises a first low-noise amplification unit and a filtering unit. Wherein the input end of the first low-noise amplification unit is used for being connected with an antenna, the output end of the first low-noise amplification unit is connected with the first end of the filtering unit, and the second end of the filtering unit is used for being connected with a receiving module or a radio frequency transceiver; the first low-noise amplification unit is used for carrying out amplification processing on a radio frequency signal received by the antenna; the filtering unit is used for filtering the amplified radio frequency signal, the first low-noise amplification unit is arranged at the front end of the receiving circuit, that is, the filtering unit is arranged at the output end of the first low-noise amplification unit, and the gain of the first low-noise amplification unit is adjusted, so that the radio frequency signal is amplified. In this way, the insertion loss of a part of receiving links can be compensated for.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of radio frequency technology, and particularly relates to a receiving circuit, a radio frequency system and a communication device. BACKGROUND

[0002] With the rapid development of mobile terminals, users have higher and higher requirements on the communication quality of radio frequency systems, especially on the receiving performance of receiving circuits.

[0003] In the related technical solution, the receiving circuit can include multiple radio frequency devices (such as low noise amplifiers, receiving filters, etc.) and radio frequency wires for connecting the radio frequency devices. The insertion loss of the radio frequency devices and the radio frequency wires is relatively large, which seriously affects the receiving performance of the receiving circuit. SUMMARY

[0004] Embodiments of the present application provide a receiving circuit, a radio frequency system and a communication device, which can compensate for the insertion loss of a receiving link and improve the receiving performance.

[0005] The first aspect provides a receiving circuit, comprising: a first low noise amplification unit and a filtering unit; wherein,

[0006] The input end of the first low noise amplification unit is used to be connected with an antenna, the output end of the first low noise amplification unit is connected with the first end of the filtering unit, and the second end of the filtering unit is used to be connected with a receiving module or a radio frequency transceiver;

[0007] The first low noise amplification unit is used to amplify and process a radio frequency signal received by the antenna;

[0008] The filtering unit is used to filter process the radio frequency signal after the amplification processing.

[0009] In the embodiment of the present application, the receiving circuit includes a first low-noise amplification unit and a filtering unit, wherein the input end of the first low-noise amplification unit is connected with the antenna, that is, the first low-noise amplification unit is arranged at the front end of the receiving circuit, and the filtering unit is arranged at the output end of the first low-noise amplification unit, that is, the filtering unit is arranged at the rear end of the receiving circuit. By arranging the first low-noise amplification unit at the front end of the receiving circuit, that is, arranging the filtering unit at the output end of the first low-noise amplification unit, the gain of the first low-noise amplification unit is adjusted to enhance the amplification processing of the radio frequency signal received by the antenna by the first low-noise amplification unit, so that the insertion loss (or loss) of part of the receiving link (or rear end link) can be compensated. The rear end link is the link between the output end of the first low-noise amplification unit and the radio frequency transceiver. Compared with the technical solution in the related art in which the low-noise amplifier is arranged at the rear end, the receiving circuit provided in the embodiment of the present application not only can support the receiving amplification and filtering processing of the radio frequency signal, but also can compensate the insertion loss caused by the filtering unit itself, and can compensate the insertion loss caused by the radio frequency wiring between the output end of the first low-noise amplification unit and the filtering unit, and thus can compensate the insertion loss of the rear end link, so as to improve the receiving performance of the receiving circuit.

[0010] The second aspect provides a radio frequency system, comprising:

[0011] a plurality of radio frequency front-end modules, each of the radio frequency front-end modules being configured to support at least receiving processing of a radio frequency signal, and each of the radio frequency front-end modules supporting a different frequency band of the radio frequency signal;

[0012] a distribution unit, a plurality of signal ends of the distribution unit being connected with the radio frequency front-end modules respectively, and a common end of the distribution unit being configured to be connected with an antenna and configured to distribute a signal received by the antenna into the radio frequency signals;

[0013] at least one second low-noise amplification unit, the second low-noise amplification unit being arranged on a first branch or a second branch, the first branch being a branch between the common end of the distribution unit and the antenna, and the second branch being a branch between any one of the radio frequency front-end modules and the signal end of the distribution unit.

[0014] The second low-noise amplification unit in the radio frequency system described above is arranged on the first branch or the second branch, that is, the second low-noise amplification unit is arranged at the front end of the radio frequency system. By adjusting the gain of the second low-noise amplification unit, the insertion loss of part of the receiving link (or rear end link) can be compensated, and the receiving performance can be improved.

[0015] The third aspect provides a radio frequency system, comprising: at least one of the foregoing receiving circuits; and at least one of a radio frequency transceiver and a receiving module.

[0016] The radio frequency system includes a receiving circuit. The first low-noise amplification unit is arranged at the front end of the receiving circuit, that is, the filtering unit is arranged at the output end of the first low-noise amplification unit, and the gain of the first low-noise amplification unit is adjusted to enhance the amplification processing of the radio frequency signal received by the antenna, so as to compensate for the insertion loss of the receiving link (or the rear-end link). Compared with the technical solution in the related art in which the low-noise amplifier is arranged at the rear end, the radio frequency system provided in the embodiment of the present application can not only support the receiving amplification and filtering processing of the radio frequency signal, but also compensate for the insertion loss caused by the filtering unit and the insertion loss caused by the radio frequency wire between the output end of the first low-noise amplification unit and the filtering unit, and further compensate for the insertion loss of the rear-end link, so as to improve the receiving performance of the radio frequency system.

[0017] The fourth aspect provides a communication device, comprising the radio frequency system.

[0018] The communication device includes the receiving circuit or the radio frequency system arranged at the second low-noise amplification unit, which can compensate for the insertion loss of the receiving link (or the rear-end link) and improve the receiving performance. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0021] Figure 1 One of the structural block diagrams of the radio frequency system in an embodiment;

[0022] Figure 2 The second structural block diagram of the radio frequency system in an embodiment;

[0023] Figure 3 One of the schematic diagrams of the receiving circuit in an embodiment;

[0024] Figure 4 The second schematic diagram of the receiving circuit in an embodiment;

[0025] Figure 5 Fig. 3 is a schematic diagram of a receiving circuit according to an embodiment;

[0026] Figure 6 Fig. 4 is a schematic diagram of a receiving circuit according to an embodiment;

[0027] Figure 7 Fig. 5 is a schematic diagram of a receiving circuit according to an embodiment;

[0028] Figure 8 Fig. 3 is a schematic diagram of a receiving circuit according to an embodiment;

[0029] Figure 9 Fig. 4 is a schematic diagram of a receiving circuit according to an embodiment;

[0030] Figure 10 Fig. 5 is a schematic diagram of a receiving circuit according to an embodiment;

[0031] Figure 11 Fig. 6 is a schematic diagram of a receiving circuit according to an embodiment;

[0032] Figure 12 Fig. 7 is a schematic diagram of a receiving circuit according to an embodiment;

[0033] Figure 13 Fig. 8 is a schematic diagram of a receiving circuit according to an embodiment;

[0034] Figure 14 Fig. 9 is a schematic diagram of a receiving circuit according to an embodiment;

[0035] Figure 15 Fig. 10 is a schematic diagram of a communication device according to an embodiment.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS

[0037] 10 - receiving circuit; 110 - first low-noise amplification unit; 111 - first low-noise amplifier; 112 - first switching switch; 113 - second switching switch; 114 - bypass branch; 115 - fourth switching switch;

[0038] 120 - filtering unit; 121 - filter; 122 - third switching switch; 123 - duplexer;

[0039] 130 - auxiliary branch;

[0040] 20 - radio frequency transceiver; 30 - receiving module; 40 - transceiving module; 50 - transmitting module;

[0041] 60 - distribution unit; 610 - combiner; 611 - three-frequency combiner;

[0042] 70 - RF front-end module; 710 - RF transceiver module; 710-1 - First RF transceiver module; 710-2 - Second RF transceiver module; 710-3 - Third RF transceiver module;

[0043] 80 - Second low-noise amplifier unit; 810 - Second low-noise amplifier; 820 - Fifth switch; 830 - Sixth switch; 840 - Second bypass branch. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] It is understood that the terms "first," "second," etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first switch may be referred to as a second switch, and similarly, a second switch may be referred to as a first switch. Both the first switch and the second switch are switches, but they are not the same switch.

[0046] like Figure 1 and Figure 2 As shown, this application provides a receiving circuit. In an exemplary embodiment, the receiving circuit 10 includes a first low-noise amplifier unit 110 and a filter unit 120. The first low-noise amplifier unit 110 and the filter unit 120 are connected, and the first low-noise amplifier unit 110 is connected to an antenna. The first low-noise amplifier unit 110 amplifies the radio frequency signal received by the antenna. For example, the first low-noise amplifier unit 110 can amplify the signal received by the antenna from the air, reduce noise interference, and improve the sensitivity of the received signal. The amplified signal can be transmitted to the filter unit 120, which can filter the amplified radio frequency signal, removing spurious waves to allow radio frequency signals of a preset frequency band to pass through.

[0047] The input terminal of the first low-noise amplifier unit 110 is used to connect to the antenna, the output terminal of the first low-noise amplifier unit 110 is connected to the first terminal of the filter unit 120, and the second terminal of the filter unit 120 is used to connect to the radio frequency transceiver 20 or the receiving module 30.

[0048] For example, the filtered signal output by the filtering unit 120 can be transmitted to a radio frequency transceiver, and the radio frequency transceiver performs downlink processing on the filtered signal to support reception of the radio frequency signal. The downlink processing includes, but is not limited to, frequency conversion, demodulation processing, etc. For example, the radio frequency transceiver can be a radio frequency integrated circuit (RFIC) or the like.

[0049] In an optional embodiment, the filtered signal output by the filtering unit 120 can be transmitted to a receiving module. The receiving module can perform receiving processing on the filtered radio frequency signal to support reception of the radio frequency signal. The receiving processing includes at least one of low-noise amplification processing and filtering processing. The receiving module can transmit the signal processed by the receiving processing to the radio frequency transceiver.

[0050] For example, the receiving module can be a FEMiD device integrating a radio frequency switch, a filter, and a duplexer, or a DiFEM device integrating a radio frequency switch and a filter, or a LFEM device integrating a radio frequency switch, a low-noise amplifier, and a filter. In the embodiments of the present application, the specific composition of the receiving module is not limited.

[0051] In the embodiments of the present application, the receiving circuit includes a first low-noise amplification unit and a filtering unit. The input end of the first low-noise amplification unit is connected with the antenna, that is, the first low-noise amplification unit is arranged at the front end of the receiving circuit. The filtering unit is arranged at the output end of the first low-noise amplification unit, that is, at the rear end of the receiving circuit. By arranging the first low-noise amplifier at the front end of the receiving circuit, that is, arranging the filtering unit at the output end of the first low-noise amplification unit, the gain of the first low-noise amplification unit is adjusted to enhance the amplification processing of the radio frequency signal received by the antenna, so that the insertion loss (or loss) of part of the receiving link (or the rear end link) can be compensated. The rear end link is the link between the output end of the first low-noise amplification unit and the radio frequency transceiver. Compared with the technical solution of arranging the low-noise amplifier at the rear end in the related art, the receiving circuit provided in the embodiments of the present application not only supports receiving amplification and filtering processing of the radio frequency signal, but also compensates the insertion loss caused by the filtering unit itself, and compensates the insertion loss caused by the radio frequency wiring between the output end of the first low-noise amplification unit 110 and the filtering unit, and further compensates the insertion loss of the rear end link, so as to improve the receiving performance of the receiving circuit.

[0052] In an exemplary embodiment, the first low-noise amplification unit 110 includes a first low-noise amplifier. The input end of the first low-noise amplifier is configured to be connected with the antenna, and the output end of the first low-noise amplifier is connected with the first end of the filtering unit 120.

[0053] In an optional embodiment, the first low-noise amplifier may be positioned close to the antenna. For example, the distance between the first low-noise amplifier and the antenna is negatively correlated with the insertion loss compensation amount. The insertion loss compensation amount is positively correlated with the absolute value of the insertion loss of the back-end link. The larger the absolute value of the insertion loss of the back-end link, the larger its insertion loss compensation amount. For example, its insertion loss compensation amount is greater than or equal to the absolute value of the insertion loss of the back-end link.

[0054] The distance between the first low-noise amplifier and the antenna is negatively correlated with the gain of the first low-noise amplifier. For example, the closer the first low-noise amplifier is to the antenna, the greater its gain, the greater its insertion loss compensation for the receiving circuit 10, and the better its receiving performance.

[0055] In an optional embodiment, the gain of the first low-noise amplifier can be fixed or adjustable. For example, the first low-noise amplifier unit 110 includes a first low-noise amplifier with adjustable gain. In practical applications, the gain of the first low-noise amplifier can be adjusted according to the distance between the first low-noise amplifier and the antenna to compensate for the insertion loss of the corresponding receiving circuit 10.

[0056] In practical applications, if the second terminal of the filter unit 120 is connected to an RF transceiver, the gain of the first low-noise amplifier is adjustable. If the second terminal of the filter unit 120 is connected to a receiving module, and the receiving module supports low-noise amplification of the signal (i.e., it includes a low-noise amplifier), then the gain of the first low-noise amplifier can be fixed. If the second terminal of the filter unit 120 is connected to a receiving module, and the receiving module does not support low-noise amplification of the signal (i.e., it includes a low-noise amplifier), then the gain of the first low-noise amplifier is adjustable.

[0057] In an optional embodiment, the first low-noise amplification unit 110 may also include at least two cascaded first low-noise amplifiers. The gain of each first low-noise amplifier may be the same or different.

[0058] In this embodiment, a first low-noise amplifier is used to amplify the radio frequency signal. The gain of the first low-noise amplifier can be adaptively adjusted or set according to the distance between the first low-noise amplifier and the antenna, thereby compensating for the insertion loss caused by the back-end link and improving the receiving performance of the receiving circuit 10.

[0059] like Figure 3 As shown, in an exemplary embodiment, the filtering unit 120 may include a first terminal, a second terminal, and a third terminal. The first terminal of the filtering unit 120 is connected to the output terminal of the first low-noise amplification unit 110, the second terminal of the filtering unit 120 is connected to the radio frequency transceiver (or receiving module), and the third terminal of the filtering unit 120 is connected to the transceiver module (or transmitting module).

[0060] The transmitting module can support transmitting processing of the radio frequency signal. The transmitting processing includes, but is not limited to, at least one of filtering processing of the received radio frequency signal and power amplification processing. Exemplarily, the transmitting module can be a MMPA device integrating a multi-mode multi-band PA or a PA MiD device integrating a PA.

[0061] The transceiving module not only supports receiving processing of the radio frequency signal, but also supports transmitting processing of the radio frequency signal. Exemplarily, the transceiving module can be a PA MiD device integrating a multi-mode multi-band PA and a FEMiD device, or the radio frequency front-end module can be a PA MiD device integrating a LNA, a multi-mode multi-band PA and a FEMiD device. In the embodiments of the present application, the specific composition of the transmitting module and the transmitting module is not limited.

[0062] On this basis, the first low-noise amplification unit 110 includes a first low-noise amplifier 111, a first switching switch 112, a second switching switch 113 and a bypass branch 114. The first switching switch 112 is connected with the input end of the first low-noise amplifier 111 and the antenna respectively; the second switching switch 113 is connected with the output end of the first low-noise amplifier 111 and the first end of the filtering unit 120 respectively; the first switching switch 112 is connected with the second switching switch 113 through the bypass branch 114.

[0063] It can be understood that the first end of the first switching switch 112 is connected with the antenna, and the two first ends of the first switching switch 112 are connected with the input end of the first low-noise amplifier 111 and the first end of the bypass branch 114 respectively; the first end of the second switching switch 113 is connected with the first end of the filtering unit 120, and the two first ends of the second switching switch 113 are connected with the output end of the first low-noise amplifier 111 and the second end of the bypass branch 114 respectively. Exemplarily, the first switching switch 112 and the second switching switch 113 can be single-pole double-throw switches, such as SPDT switches.

[0064] By controlling the on / off states of the first switching switch 112 and the second switching switch 113, the branch containing the bypass branch 114 can be activated, as can the branch containing the first low-noise amplifier 111. When the branch containing the bypass branch 114 is activated, the transmitting module or transceiver module connected to the third terminal of the filtering unit 120 can provide radio frequency signals for uplink communication. These signals can be processed by the filtering unit 120 and transmitted to the bypass branch 114, and then transmitted from the bypass branch 114 to the antenna to support the transmission function of the radio frequency signal. It can be understood that the bypass branch 114 is used to support the signal transmission function of the receiving circuit 10 when the transmitting module or transceiver module is working. When the branch containing the first low-noise amplifier 111 is turned on, the receiving circuit 10 can receive the radio frequency signal from the antenna for downlink communication. The first low-noise amplifier 111 can amplify the received radio frequency signal and transmit the processed signal to the filtering unit 120. After being filtered by the filtering unit 120, the signal is transmitted to the receiving module or radio frequency transceiver to support the reception and processing of the radio frequency signal.

[0065] In this embodiment, the receiving circuit can support not only the reception and processing of radio frequency signals, but also the transmission of radio frequency signals. Furthermore, its first low-noise amplifier is located at the front end of the receiving circuit. By adjusting or setting the gain of the first low-noise amplifier, its amplification of the received signal is enhanced. It can also compensate for the insertion loss of the link at the output of the first low-noise amplifier, which is caused by the insertion loss of the filtering unit itself and the radio frequency trace between the output of the first low-noise amplifier and the filtering unit, thereby improving the receiving performance of the receiving circuit.

[0066] like Figure 4 As shown, based on the foregoing embodiments, in an exemplary embodiment, the receiving circuit further includes an auxiliary branch 130, and the first switching switch 112 is also connected to the transmitting module or transceiver module via the auxiliary branch 130. Specifically, a first terminal of the first switching switch 112 is connected to the antenna, a second terminal of the first switching switch 112 is connected to the input terminal of the first low-noise amplifier 111, another second terminal of the first switching switch 112 is connected to a second terminal of the second switching switch 113 via a bypass branch 114, and yet another second terminal of the first switching switch 112 is connected to the transmitting module or transceiver module via the auxiliary branch 130. For example, the first switching switch 112 can be an SP3D switch.

[0067] In the case that the branch of the auxiliary branch 130 is turned on, the transmitting module or the transceiver module connected with the third end of the filter unit 120 can provide the radio frequency signal for the uplink communication to the auxiliary branch 130, and the auxiliary branch 130 transmits the radio frequency signal to the antenna to support the transmitting function of the radio frequency signal. It can be understood that the auxiliary branch 130 can also be used to support the signal transmitting function of the receiving circuit in the case that the transmitting module or the transceiver module works.

[0068] It can be understood that two transmitting paths can be included in the receiving circuit, for example, a first transmitting path and a second transmitting path, wherein the first transmitting path is a path from the filter unit 120 to the antenna through the second switching switch 113, the bypass branch 114, and the first switching switch 112; and the second transmitting path is a path from the auxiliary branch 130 to the antenna through the first switching switch 112. The path insertion loss of the first transmitting path is greater than the path insertion loss of the second transmitting path. For example, the first transmitting path can be suitable for a first power scenario, and the second transmitting path can be suitable for a second power scenario, wherein the transmitting demand power of the first power scenario is higher than the transmitting demand power of the second power scenario. The transmitting demand power can be the target transmitting power when transmitting the communication.

[0069] In the embodiment, by setting the first transmitting path and the second transmitting path in the receiving circuit, the insertion losses of the two transmitting paths are different, so that the receiving circuit can select a suitable transmitting path according to the communication scenario to transmit the radio frequency signal for the uplink communication, which can be suitable for different communication scenarios.

[0070] As shown in Figure 5 and Figure 6 In an exemplary embodiment, the filter unit 120 can include a filter 121 and a third switching switch 122, or the filter unit 120 can include a duplexer 123. In the embodiment, a suitable filter unit 120 can be selected according to the frequency band mode of the radio frequency signal. The frequency band mode of the radio frequency signal can include an FDD mode and a TDD mode. Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD) are two main duplex communication technologies. In the time division duplexing TDD, the transmitting and receiving share one radio frequency point (i.e., the same frequency), and the uplink and downlink use different time slots for communication, that is, the uplink and downlink transmission is realized by time division. In the frequency division duplexing FDD, the transmitting and receiving use different radio frequency points (i.e., two independent frequencies) to perform uplink and downlink transmission. For example, the two frequencies can be symmetrical, and a certain guard bandwidth is required to avoid interference.

[0071] Please continue to refer to Figure 5In an exemplary embodiment, the frequency band mode of the radio frequency signal is FDD mode. The filter unit 120 includes a duplexer 123. A first end of the duplexer 123 is the second end of the filter unit 120 and is connected to the receiving module or the radio frequency transceiver. Another first end of the duplexer 123 is the third end of the filter unit 120 and is connected to the transmitting module or the transceiving module. The second end of the duplexer 123 is the first end of the filter unit 120 and is connected to the second switch 113.

[0072] Please continue to refer to Figure 6 In an exemplary embodiment, the frequency band mode of the radio frequency signal is TDD mode. The filter unit 120 includes a filter 121 and a third switch 122. A first end of the filter 121 is the first end of the filter unit 120 and is connected to the second switch 113. A second end of the filter 121 is connected to a first end of the third switch 122. A second end of the third switch 122 is the second end of the filter unit 120 and is connected to the receiving module or the radio frequency transceiver. Another first end of the third switch 122 is the third end of the filter unit 120 and is connected to the transmitting module or the transceiving module.

[0073] As shown in Figure 7 In an exemplary embodiment, the first low noise amplification unit 110 includes a first low noise amplifier 111 and a fourth switch 115. A first end of the fourth switch 115 is connected to the antenna. A second end of the fourth switch 115 is connected to an input end of the first low noise amplifier 111. Another second end of the fourth switch 115 is connected to the transmitting module or the transceiving module. The fourth switch 115 can selectively turn on a path between the antenna and the first low noise amplifier 111. The fourth switch 115 can also selectively turn on a path between the antenna and the transmitting module (or the transceiving module), which is a transmitting path.

[0074] When the branch of the transmitting path is turned on, the radio frequency signal for uplink communication provided by the transmitting module or the transceiving module can be transmitted to the antenna through the transmitting path to support the transmitting function of the radio frequency signal. When the fourth switch turns on the path between the antenna and the first low noise amplifier 111, the receiving circuit 10 can receive the radio frequency signal for downlink communication from the antenna. The first low noise amplifier 111 can amplify the received radio frequency signal and transmit the processed signal to the filter unit 120. After the filter processing of the filter unit 120, the signal is transmitted to the receiving module or the radio frequency transceiver to support the receiving processing of the radio frequency signal.

[0075] In the embodiment, the receiving circuit can support not only the receiving processing of the radio frequency signal but also the transmitting transmission of the radio frequency signal. In addition, the first low noise amplifier is arranged at the front end of the receiving circuit, and by adjusting or setting the gain of the first low noise amplifier, the amplification processing of the received signal by the first low noise amplifier is enhanced, and the insertion loss of the link at the output end of the first low noise amplifier can be compensated due to the insertion loss caused by the filter unit itself and the radio frequency line between the output end of the first low noise amplifier and the filter unit, so as to improve the receiving performance of the receiving circuit.

[0076] In the embodiment, a radio frequency system is further provided. In an exemplary embodiment, please continue to refer to Figure 1 、 Figure 2 and Figure 8 , the radio frequency system can include at least one receiving circuit 10 in any of the foregoing embodiments, and can further include at least one of a radio frequency transceiver and a receiving module. The second end of the filter unit 120 in each receiving circuit 10 can be connected to the receiving module or the radio frequency transceiver.

[0077] The radio frequency system in the embodiment includes the receiving circuit in any of the foregoing embodiments, and the first low noise amplifier in the receiving circuit is arranged at the front end of the receiving circuit, that is, the filter unit is arranged at the output end of the first low noise amplifier. By adjusting the gain of the first low noise amplifier, the amplification processing of the received radio frequency signal by the first low noise amplifier is enhanced, so that the insertion loss of the rear-end link can be compensated, and the receiving performance of the radio frequency system is improved.

[0078] As shown in Figure 9 , in the optional embodiment, if the receiving circuit 10 includes a switching switch (for example, a first switching switch, a second switching switch, or a fourth switching switch), the radio frequency system can further include a transmitting module 50 or a transceiving module 40.

[0079] In the embodiment, the radio frequency system can support not only the receiving processing of the radio frequency signal but also the transmitting transmission of the radio frequency signal. In addition, the first low noise amplifier is arranged at the front end of the receiving circuit, and by adjusting or setting the gain of the first low noise amplifier, the amplification processing of the received signal by the first low noise amplifier is enhanced, and the insertion loss of the link at the output end of the first low noise amplifier can be compensated due to the insertion loss caused by the filter unit itself and the radio frequency line between the output end of the first low noise amplifier and the filter unit, so as to improve the receiving performance of the receiving circuit.

[0080] In the embodiment, a radio frequency system is further provided. As shown in Figure 10 and Figure 11As shown, the radio frequency system comprises a distribution unit 60, a plurality of radio frequency front end modules 70 and at least one second low noise amplification unit 80.

[0081] The distribution unit 60 can comprise a plurality of signal ends and a common end. Among them, the number of signal ends of the distribution unit 60 is greater than or equal to the number of radio frequency front end modules 70.

[0082] The plurality of signal ends of the distribution unit 60 are respectively connected with the plurality of radio frequency front end modules 70, and the common end of the distribution unit 60 is used to be connected with the antenna. Among them, the distribution unit 60 has a signal distribution function, which can reasonably distribute the received signals from the antenna according to the actual needs, and realize the distribution transmission of multiple signals. For example, the distribution unit 60 can distribute the received signals from the antenna to three channels in the distribution unit 60, so as to respectively output radio frequency signal A, radio frequency signal B and radio frequency signal C through three signal ends. Among them, the radio frequency signal A, the radio frequency signal B and the radio frequency signal C are respectively transmitted to the radio frequency front end module 70 connected with the signal end.

[0083] Among them, each radio frequency front end module 70 is used to support at least the reception processing of the radio frequency signal. For example, the radio frequency front end module 70 can support the reception processing of the radio frequency signal. In an optional embodiment, the radio frequency front end module 70 can support the reception processing of the radio frequency signal, and can also support the transmission processing of the radio frequency signal.

[0084] Taking the radio frequency front end module 70 supporting the reception processing of the radio frequency signal as an example for description. Each radio frequency front end module 70 can transmit the radio frequency signal after the reception processing to the corresponding transceiver. The reception processing includes but is not limited to at least one of the filter processing and the low noise amplification processing of the received radio frequency signal. In an exemplary embodiment, the radio frequency front end module 70 includes but is not limited to at least one reception branch, and each reception branch can include at least one of a reception filter (or a multiplexer) and a low noise amplifier. In an optional embodiment, the radio frequency front end module 70 can also include a plurality of radio frequency switches for frequency band switching and the like.

[0085] In an optional embodiment, the radio frequency front end module 70 can be a radio frequency integrated device, such as a radio frequency chip and the like. For example, the radio frequency front end module 70 can be a FEMiD device integrating a radio frequency switch, a filter 121 and a duplexer 123, or the radio frequency front end module 70 can be a DiFEM device integrating a radio frequency switch and a filter 121, or the radio frequency front end module 70 can be a LFEM device integrating a radio frequency switch, a low noise amplifier and a filter 121. In the embodiment of the present application, the specific composition mode of the radio frequency front end module 70 is not limited.

[0086] The frequency bands of the radio frequency signals supported by each radio frequency front-end module 70 are different. In the embodiments of the present application, the radio frequency signals supported by each radio frequency front-end module 70 include, but are not limited to, WiFi signals, 2G GSM signals, 3G WCDMA signals, 4G TLE signals, 5G NR signals, Bluetooth signals, or GPS signals, etc. For example, the frequency bands of the WiFi signals include WiFi 5G, WiFi 2.4G, WiFi 6G, etc., the frequency bands of the 4G TLE signals include low frequency bands, medium frequency bands, and high frequency bands, etc., and the frequency bands of the 5G NR signals include low frequency bands, medium frequency bands, high frequency bands, and ultra-high frequency bands, etc. If the radio frequency signal is a cellular signal, the corresponding transceiver is a radio frequency transceiver, such as a radio frequency chip; if the radio frequency signal is a WiFi signal, the corresponding transceiver is a WiFi chip or a WCN chip, etc.; and if the radio frequency signal is a Bluetooth signal, the corresponding transceiver can be a Bluetooth chip or a WCN chip, etc.

[0087] In optional embodiments, the radio frequency system can include a first radio frequency front-end module and a second radio frequency front-end module, wherein the first radio frequency front-end module can support the reception processing of cellular signals in medium-high frequency bands, and the second radio frequency front-end module can support the reception processing of WiFi 2.4G band signals or Bluetooth signals. Alternatively, the first radio frequency front-end module can support the reception processing of cellular signals in ultra-high frequency bands, and the second radio frequency front-end module can support the reception processing of WiFi 5G band signals. Alternatively, the first radio frequency front-end module can support the reception processing of cellular signals in at least one frequency band, and the second radio frequency front-end module can support the reception processing of cellular signals in at least one frequency band, wherein the frequency bands of the cellular signals supported by the first radio frequency front-end module and the second radio frequency front-end module are at least partially different. For example, the first radio frequency front-end module can support cellular signals in low frequency bands and medium frequency bands, and the second radio frequency front-end module can support cellular signals in high frequency bands and ultra-high frequency bands.

[0088] In optional embodiments, the radio frequency system includes two or more radio frequency front-end modules. The functions of the radio frequency front-end modules and the frequency bands of the radio frequency signals they support are not limited to the above examples.

[0089] In an exemplary embodiment, the radio frequency system can include at least one second low-noise amplification unit 80, which can be used to support the amplification processing of the received radio frequency signals. For example, the second low-noise amplification unit 80 can amplify the signals received by the antenna from the air, reduce noise interference, and improve the sensitivity of the received signals.

[0090] For example, the radio frequency system can include one second low-noise amplification unit 80, or at least two second low-noise amplification units 80.

[0091] The second low noise amplification unit 80 can be arranged on the first branch or the second branch. The first branch is a branch between the common terminal of the combiner and the antenna, and the second branch is a branch between any of the radio frequency front end module 70 and the signal terminal of the combiner. That is, the radio frequency system can include multiple second branches. In the embodiment of the present application, one or more second low noise amplification units 80 can be arranged on the same branch. The second low noise amplification unit 80 is arranged on at least one of the first branch and the second branch.

[0092] In actual application, the number of the second low noise amplification unit 80 and the specific position of the branch can be set according to actual communication requirements, which is not limited herein.

[0093] In an exemplary embodiment, the second low noise amplification unit 80 is arranged on the first branch, that is, the second low noise amplification unit 80 is arranged at the front end of the radio frequency system. The gain of the second low noise amplification unit 80 is set to compensate for the insertion loss of part of the receiving link (or the rear end link) and improve the receiving performance. The receiving link is a link from the antenna terminal, through the first branch, the distribution unit 60, the second branch, the radio frequency front end module 70 to the radio frequency transceiver. For example, the antenna terminal can be an antenna seat for connecting the antenna. The first branch is a branch between the combiner and the antenna seat. That is, multiple sections of radio frequency wires, the radio frequency front end module 70, the second branch distribution unit 60, and the first branch are arranged on the receiving link. The rear end link can be a link of the output terminal of the second low noise amplification unit 80. The rear end link is a link between the output terminal of the second low noise amplification unit 80 and the transceiver. The link includes multiple sections of radio frequency wires, the distribution unit 60 (for example, the combiner or the power divider), and internal devices (for example, the filter 121, the radio frequency switch, etc.) in the radio frequency front end module 70.

[0094] In the embodiment of the present application, the gain of the second low noise amplification unit 80 determines the amplification capability of the signal, and the gain is positively correlated with the amplification capability. The greater the gain, the greater the amplification capability of the signal. In an exemplary embodiment, the link insertion loss of the second low noise amplification unit 80 in the receiving circuit 10 can be determined according to the position of the second low noise amplification unit 80, and the gain of the second low noise amplification unit 80 can be set accordingly, so as to compensate for the insertion loss of part of the receiving link.

[0095] In an optional embodiment, the second low noise amplification unit 80 can be arranged close to the antenna. For example, the distance between the second low noise amplification unit 80 and the antenna is negatively correlated with the insertion loss compensation amount. The distance between the second low noise amplification unit 80 and the antenna is negatively correlated with the gain of the second low noise amplification unit 80.

[0096] For example, the closer the second low noise amplification unit 80 is to the antenna, the greater the insertion loss compensation of the receiving link, and the better the receiving performance.

[0097] In an exemplary embodiment, the second low noise amplification unit 80 can also be disposed on the second branch, i.e., disposed on the link between the radio frequency front end module 70 and the combiner. The gain of the second low noise amplification unit 80 is set to compensate for the insertion loss of the partial receiving link (or back-end link). The back-end link can be the link from the output of the second low noise amplification unit 80. The back-end link is the link between the output of the second low noise amplification unit 80 and the transceiver, which includes multiple radio frequency traces and internal devices (e.g., filters 121, radio frequency switches, etc.) in the radio frequency front end module 70, to improve the receiving performance.

[0098] In an exemplary embodiment, the second low noise amplification unit 80 includes one second low noise amplifier or at least two cascaded second low noise amplifiers. The gain of the second low noise amplifier can be fixed or adjustable.

[0099] For example, the second low noise amplification unit 80 includes one second low noise amplifier with adjustable gain. In practical applications, the gain of the second low noise amplifier can be adjusted according to the position of the second low noise amplifier in the receiving link, to compensate for the insertion loss of the corresponding receiving link.

[0100] In an alternative embodiment, the second low noise amplification unit 80 includes at least two cascaded second low noise amplifiers, and the gain of each second low noise amplifier in the multiple cascaded second low noise amplifiers is fixed. In practical applications, each second low noise amplifier with fixed gain can be selected according to the position of the second low noise amplifier in the receiving link, to compensate for the insertion loss of the corresponding receiving link.

[0101] In the embodiments of the present application, at least one second low noise amplifier is disposed, and the gain of the second low noise amplifier can be adjusted according to the position of the second low noise amplifier in the receiving link, to compensate for the insertion loss of the corresponding receiving link, thereby improving the receiving performance of the radio frequency system.

[0102] In an exemplary embodiment, if the radio frequency front end module 70 is used to support the receiving processing of radio frequency signals, the distribution unit 60 can include a power divider or a combiner.

[0103] The power divider, also known as power divider, is a device that divides the energy of one input signal into two or more output signals with equal or unequal energy. The multiple signal ends of the power divider are respectively connected to the multiple radio frequency front end modules 70, and the common end of the power divider is used to connect to the antenna. The types of power dividers include, but are not limited to, two power dividers, four power dividers, six power dividers, etc. For example, the radio frequency system includes n radio frequency front end modules 70, and the type of power divider is m power divider. Wherein, m≥n≥2, m and n are positive integers.

[0104] The multiple signal terminals of the combiner are respectively connected to multiple RF front-end modules 70, and the common terminal of the combiner is used to connect to the antenna. The combiner has a signal distribution function, which can distribute the received signal from the antenna to multiple channels in the combiner to achieve independent output of multiple signals. The types of combiners include, but are not limited to, dual-band combiners, tri-band combiners, and quad-band combiners. For example, the RF system includes n RF front-end modules 70, and the type of combiner is a q-band combiner. Where m ≥ q ≥ 2, and m and q are both positive integers.

[0105] In this embodiment of the application, a power divider or rationalizer is set to distribute the signal received by the antenna so as to output n radio frequency signals respectively. Each radio frequency front-end module 70 can receive a radio frequency signal and process the received radio frequency signal. The frequency bands of the processed radio frequency signals are different.

[0106] like Figure 12 and Figure 13 As shown, in an exemplary embodiment, the plurality of radio frequency front-end modules 70 include at least one radio frequency transceiver module 710, which supports not only receiving radio frequency signals but also transmitting radio frequency signals.

[0107] Transmission processing includes, but is not limited to, at least one of filtering and power amplification processing of the received radio frequency signal. In an exemplary embodiment, the radio frequency transceiver module 710 includes, but is not limited to, at least one transceiver branch, each of which may include a power amplifier, a low-noise amplifier, a transceiver filter (or multiplexer), etc. In an optional embodiment, the radio frequency transceiver module 710 may further include multiple radio frequency switches for frequency band switching, etc.

[0108] In optional embodiments, the RF transceiver module 710 may be an integrated RF device, such as an RF chip. For example, the RF transceiver module 710 may be a PA MiD device integrating a multi-mode multi-band PA and an FEMiD device, or the RF transceiver module 710 may be a PA MiD device integrating an LNA, a multi-mode multi-band PA, and an FEMiD device. In the embodiments of this application, the specific composition of the RF transceiver module 710 is not specifically limited.

[0109] In the embodiment, the distribution unit 60 can include a combiner 610 having a combining and distribution function. For example, the combiner 610 can combine at least two radio frequency signals output from different radio frequency front end modules into one radio frequency signal and output to the antenna, while avoiding mutual influence between the signals of each port. Correspondingly, the combiner can also distribute the signal from the antenna into at least two radio frequency signals and output to different radio frequency front end modules correspondingly. For example, the radio frequency system includes n radio frequency front end modules, and the type of the combiner is a q-combining combiner. Wherein, m≥q≥2, m and q are positive integers, and q is the number of signal terminals of the combiner.

[0110] The second low noise amplification unit 80 located in the first branch or the second target branch includes a second low noise amplifier 810, a fifth switching switch 820, a sixth switching switch 830, and a second bypass branch 840. The fifth switching switch 820 is connected with the input terminal of the second low noise amplifier 810 and the antenna respectively; the sixth switching switch 830 is connected with the output terminal of the second low noise amplifier 810; the fifth switching switch 820 is connected with the sixth switching switch 830 through the second bypass branch 840; and the second target branch is the branch between any radio frequency transceiver module 710 and the signal terminal of the combiner 610. Wherein, the number of the second target branch is less than or equal to the total number of the radio frequency front end modules 70.

[0111] In the optional embodiment, the second low noise amplification unit 80 can also include one second low noise amplifier 810, or can include at least two cascaded second low noise amplifiers 810.

[0112] Wherein, the working mode of the radio frequency transceiver module 710 includes a receiving mode and a transmitting mode. When working in the transmitting mode, the radio frequency transceiver module 710 can support power amplification and transmitting filter processing of the radio frequency signal; and when working in the receiving mode, the radio frequency transceiver module 710 can support receiving filter and low noise amplification processing of the radio frequency signal.

[0113] In the case that the radio frequency transceiver module 710 works in the transmitting mode, the bypass branch is turned on. In an exemplary embodiment, in the case that the radio frequency transceiver module 710 works in the transmitting mode, the fifth switching switch 820 and the sixth switching switch 830 can control the second bypass branch 840 to be turned on, that is, to make the common terminal of the combiner connected with the antenna through the second bypass branch 840. In this way, the combiner 610 can combine the radio frequency signals output by each radio frequency transceiver module 710, and the combined signal is output through the antenna.

[0114] In the case that the radio frequency transceiver module 710 works in the receiving mode, the branch with the second low noise amplifier 810 is turned on. In an exemplary embodiment, in the case that the radio frequency transceiver module 710 works in the receiving mode, the fifth switch 820 and the sixth switch 830 can control the branch with the second low noise amplifier 810, i.e., to make the common terminal of the combiner 610 connected with the antenna through the second low noise amplifier 810, so that the combiner 610 can perform the branching processing on the signal from the antenna and output each radio frequency signal to the corresponding radio frequency front end module 70 (or the radio frequency transceiver module 710).

[0115] In the embodiment, the radio frequency system includes at least one radio frequency transceiver module which supports not only the receiving of the radio frequency signal but also the transmitting of the radio frequency signal, wherein the second low noise amplification unit in the first branch or the second target branch is provided with not only the second low noise amplifier but also two switch switches and the second bypass branch. When the radio frequency front end module works in the transmitting mode, the transmitting link with the second bypass branch is turned on by changing the on-off state of the fifth switch and the sixth switch, to support the transmitting of the radio frequency signal; correspondingly, when the radio frequency front end module works in the receiving mode, the receiving link with the second low noise amplifier is turned on by changing the on-off state of the fifth switch and the sixth switch, to support the receiving of the radio frequency signal. In addition, since the first branch or the second target branch is provided with the second low noise amplification unit, the gain of the second low noise amplification unit is set to amplify the received signal, to compensate the insertion loss of the rear-end link and improve the receiving performance.

[0116] In an exemplary embodiment, each radio frequency front end module in the radio frequency system is a radio frequency transceiver module. As shown in Figure 14 In the embodiment of the present application, for the convenience of description, the radio frequency system includes three radio frequency transceiver modules 710, which can be respectively denoted as the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3, and the allocation unit is the three-frequency combiner 611, which is taken as an example for description.

[0117] The three signal terminals of the three-frequency combiner 611 are respectively connected with the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3, and the common terminal of the three-frequency combiner 611 is connected with the antenna. The aforementioned second low noise amplification unit 80 provided with the second low noise amplifier 810, the two switch switches and the second bypass branch 840 is arranged on the first branch, i.e., it is arranged between the common terminal of the three-frequency combiner 611 and the antenna.

[0118] When the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3 work in the transmitting mode at the same time, the three-frequency combiner 611 can perform combing processing on the received three radio frequency signals, and control the on-off state of the two switching switches to turn on the second bypass branch 840, so that the combing processed signals can be transmitted to the antenna through the second bypass branch 840 to realize the combing processing of multiple radio frequency signals and support the uplink transmission of carrier aggregation of multiple signals.

[0119] When the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3 work in the receiving mode at the same time, the on-off state of the two switching switches can be controlled to turn on the branch where the second low noise amplifier 810 is located. The signals from the antenna can be amplified and processed by the second low noise amplifier 810 and then output to the common end of the three-frequency combiner 611. The three-frequency combiner 611 can perform distribution processing on the amplified and processed signals to output three radio frequency signals and correspondingly transmit them to the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3. The received radio frequency signals are filtered and low-noise amplified by each radio frequency transceiver module to simultaneously support the receiving processing of three signals. Since the second low noise amplifier unit 80 is arranged in the first branch (i.e. the side where the common end of the three-frequency combiner 611 is located, for example, the front end of the radio frequency system), the signals received by the antenna can be additionally amplified and processed, which can compensate for the insertion loss caused by the combiner, the radio frequency transceiver module 710 and the multiple radio frequency lines, improve the signal receiving capability of the entire receiving link, and improve the receiving performance of the radio frequency system.

[0120] In an exemplary embodiment, the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3 are respectively connected to the three signal ends of the three-frequency combiner 611. The radio frequency system can include three second branches, which can be referred to as the second branch a, the second branch b and the second branch c.

[0121] Among them, the radio frequency system can include a second low noise amplifier unit 80, wherein the second low noise amplifier unit 80 can be arranged in any one of the second branch a, the second branch b and the second branch c.

[0122] In an alternative embodiment, the radio frequency system can include two second low noise amplifier units 80, and any two of the second branch a, the second branch b and the second branch c can correspondingly be provided with a second low noise amplifier unit 80.

[0123] In an exemplary embodiment, the radio frequency system comprises a plurality of second low noise amplification units 80, wherein one second low noise amplification unit 80 is arranged on each second branch. For example, the radio frequency system can comprise three second low noise amplification units 80, and one second low noise amplification unit 80 is arranged on each of the second branch a, the second branch b and the second branch c respectively.

[0124] For the convenience of description, the second low noise amplification unit 80 arranged on the second branch b is taken as an example for description.

[0125] When the first radio frequency transceiver module 710-1, the second radio frequency transceiver module 710-2 and the third radio frequency transceiver module 710-3 work in the receiving mode simultaneously, the on-off states of the two switches can be controlled to turn on the branch where the second low noise amplifier 810 is arranged. The signal from the antenna can be transmitted to the common terminal of the combiner, and the combiner can perform distribution processing on the signal and output the signal A, the signal B and the signal C correspondingly. The signal A can be transmitted to the first radio frequency transceiver module 710-1 and subjected to filtering and low noise amplification processing to realize the reception of the signal A. The signal B can be transmitted to the first radio frequency transceiver module 710 and subjected to filtering and low noise amplification processing. After the signal B is amplified by the second low noise amplifier 810, it is output to the second radio frequency transceiver module 710-2 and subjected to filtering and low noise amplification processing. The signal C can be transmitted to the third radio frequency transceiver module 710-3 and subjected to filtering and low noise amplification processing to realize the reception of the signal C.

[0126] Since the second low noise amplification unit 80 is arranged on the second branch b, the signal B output by the combiner can be subjected to additional signal amplification processing, which can compensate for the insertion loss caused by the devices in the second radio frequency transceiver module 710-2 and the multiple radio frequency lines and improve the signal reception capability of the receiving link where the second radio frequency transceiver module 710-2 is located, so as to improve the receiving performance of the radio frequency system.

[0127] In actual application, the number of the second low noise amplification units 80 and the arrangement positions of the second low noise amplification units 80 can be determined according to the distance between each radio frequency front end module 70 and the antenna, the reception processing capability of each radio frequency front end module 70 for the radio frequency signal, the insertion loss caused by the receiving branch, the radiation efficiency of the antenna for each radio frequency signal and other dimensions.

[0128] In an exemplary embodiment, a communication device is provided, which can comprise the radio frequency system in any of the foregoing embodiments.

[0129] In an exemplary embodiment, a communication device is provided, which can be a terminal, and the internal structure diagram thereof can be as shown in Figure 15The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The input / output interface of the computer device is configured to exchange information between the processor and external devices. The communication interface of the computer device is configured to perform wired or wireless communication with external terminals, and the wireless communication can be achieved through WIFI, mobile cellular network, Near Field Communication (NFC) or other technologies. The computer program is executed by the processor to implement a coexistence communication method. The display unit of the computer device is configured to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or can be a key, trackball or touchpad arranged on the shell of the computer device, or can be an external keyboard, touchpad or mouse, etc.

[0130] Those skilled in the art can understand that Figure 15 The skilled in the art can understand that

[0131] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0132] The above embodiments only express several implementation manners of the present application, and the description is specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are all within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A receiving circuit, characterized in that, include: The first low-noise amplification unit and the filtering unit; wherein... The input terminal of the first low-noise amplifier unit is used to connect to the antenna, the output terminal of the first low-noise amplifier unit is connected to the first terminal of the filter unit, and the second terminal of the filter unit is used to connect to the receiving module or the radio frequency transceiver. The first low-noise amplifier unit is used to amplify the radio frequency signal received by the antenna; The filtering unit is used to filter the amplified radio frequency signal.

2. The receiving circuit according to claim 1, characterized in that, The first low-noise amplification unit includes: A first low-noise amplifier, the input of which is connected to an antenna, and the output of which is connected to a first end of the filter unit.

3. The receiving circuit according to claim 2, characterized in that, The third terminal of the filtering unit is used to connect to the transmitting module or the transceiver module. The first low-noise amplification unit further includes: a first switching switch, a second switching switch, and a first bypass branch; wherein, The first switching switch is connected to the input terminal of the first low-noise amplifier and the antenna, respectively; The second switching switch is connected to the output terminal of the first low-noise amplifier and the first terminal of the filter unit, respectively. The first switching switch is connected to the second switching switch via the first bypass branch.

4. The receiving circuit according to claim 3, characterized in that, The filtering unit includes a duplexer, a first end of which is used to connect to the receiving module or the radio frequency transceiver, and another first end of which is used to connect to the transmitting module or the transceiver module. The second end of the duplexer is connected to the second switching switch.

5. The receiving circuit according to claim 3, characterized in that, The filtering unit includes a filter and a third switching switch; wherein... The first end of the filter is connected to the first end of the second switching switch, the second end of the filter is connected to the first end of the third switching switch, a second end of the third switching switch is used to connect to the receiving module or the radio frequency transceiver, and the other first end of the third switching switch is used to connect to the transmitting module or the transceiver module.

6. The receiving circuit according to claim 3, characterized in that, The receiving circuit also includes an auxiliary branch, and the first switching switch is also connected to the transmitting module or the transceiver module via the auxiliary branch.

7. The receiving circuit according to claim 2, characterized in that, The first low-noise amplifier unit further includes a fourth switching switch, wherein a first end of the fourth switching switch is used to connect to an antenna, a second end of the fourth switching switch is connected to the input end of the low-noise amplifier, and the other second end of the fourth switching switch is used to connect to a transmitting module or a transceiver module.

8. A radio frequency system, characterized in that, include: Multiple radio frequency front-end modules, each radio frequency front-end module is used to support at least the reception and processing of radio frequency signals, and each radio frequency front-end module supports a different frequency band of the radio frequency signals; The distribution unit has multiple signal terminals that are respectively connected to multiple radio frequency front-end modules, and the common terminal of the distribution unit is used to connect to an antenna to distribute the signal received by the antenna into multiple radio frequency signals. At least one second low-noise amplifier unit is provided, wherein the second low-noise amplifier unit is disposed on the first branch or the second branch; the first branch is the branch between the common terminal of the distribution unit and the antenna, and the second branch is the branch between any of the radio frequency front-end modules and the signal terminal of the distribution unit.

9. The radio frequency system according to claim 8, characterized in that, The second low-noise amplification unit includes a second low-noise amplifier or at least two cascaded second low-noise amplifiers.

10. The radio frequency system according to claim 9, characterized in that, The gain of the second low-noise amplifier unit is adjustable, wherein the distance between the second low-noise amplifier unit and the antenna is negatively correlated with the gain.

11. The radio frequency system according to claim 8, characterized in that, The radio frequency front-end module is used to support the reception and processing of radio frequency signals, and the distribution unit includes a power divider or a combiner.

12. The radio frequency system according to claim 8, characterized in that, The plurality of radio frequency front-end modules include at least one radio frequency transceiver module, which is used to support the transmission and reception processing of the radio frequency signals; wherein, the distribution unit includes a combiner; The second low-noise amplifier unit located in the first branch or the second target branch includes a second low-noise amplifier, a fifth switching switch, a sixth switching switch, and a second bypass branch. The fifth switching switch is connected to the input terminal and the antenna of the second low-noise amplifier, respectively. The sixth switching switch is connected to the output terminal of the second low-noise amplifier. The fifth switching switch is connected to the sixth switching switch via the second bypass branch. The second target branch is the branch between any of the RF transceiver modules and the signal terminal of the combiner. When the radio frequency transceiver module is operating in transmit mode, the branch containing the second bypass path is turned on. When the RF transceiver module is operating in receive mode, the branch containing the second low-noise amplifier is turned on.

13. The radio frequency system according to claim 12, characterized in that, Each of the aforementioned radio frequency front-end modules is the radio frequency transceiver module.

14. The radio frequency system according to claim 8, characterized in that, The radio frequency system includes a plurality of second low noise amplification units, wherein each second branch is provided with a second low noise amplification unit.

15. The radio frequency system according to claim 8, characterized in that, Among the plurality of radio frequency front-end modules, at least one radio frequency front-end module supports a WiFi signal and at least one radio frequency front-end module supports a cellular signal.

16. A radio frequency system, characterized in that, include: At least one receiving circuit as described in any one of claims 1-7; as well as At least one of a radio frequency transceiver and a receiving module.

17. A communication device, characterized in that, Including the radio frequency system as described in any one of claims 8-16.

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