A communication device, a radio frequency system, and a radio frequency front-end module

Abstract

The present application discloses a communication device and its radio frequency front-end module, which are applied to the field of communication technologies. The device includes: a first channel switching circuit having communication channels for N frequency bands, which is used to adjust the connection relationship between the communication channels of each frequency band and the transceiver under the control of a first control terminal, so that the communication channels of the corresponding frequency bands are connected to the radio frequency signal transmission terminals designated for these communication channels currently; a first DC biaser is used to couple the radio frequency signal and the first control signal, so that after being decoupled by the second DC biaser through the first coaxial cable, they are respectively transmitted to the radio frequency signal transmission terminal and the first control signal transmission terminal of the first radio frequency module, so that the first radio frequency module performs radio frequency signal transmission with the first antenna device under the control of the first control signal. By applying the solution of the present application, the wiring is effectively simplified.

Description

Technical Field

[0001] The present invention relates to the field of communication technologies, and particularly to a communication device, a radio frequency system, and a radio frequency front-end module. Background Art

[0002] In a wireless communication system, both the transmitting unit and the receiving unit hope to be as close as possible to the antenna to reduce the loss of transmission power and lower the receiving noise coefficient. In systems such as CA (Carrier Aggregation) and MIMO (Multiple-in Multiple-out), there are multiple antennas. To reduce the wiring length between the antenna and the radio frequency front-end, the distance between the control module and the radio frequency front-end will increase, and it is necessary to separate the radio frequency front-end. Each antenna has its own dedicated radio frequency front-end, which is called the RRU (Remote Radio Unit) technology. Obviously, although the RRU design reduces the distance from the radio frequency front-end to the antenna and lowers the front-end loss, the distance from the radio frequency front-end to the SoC (System on Chip) and PMIC (Power Management Integrated Circuit) is relatively long, increasing the complexity of wiring. In addition, each radio frequency front-end requires TXin, Rxout, VDD, multiple control signals, etc., especially the power supply line. A long power supply line will cause a large voltage drop, affecting the working efficiency. Moreover, since the number of traces from the SOC and PMIC to the radio frequency front-end is large, it will also increase the area of the PCB (Printed Circuit Board).

[0003] Reference can be made to Figure 1 which is a schematic structural diagram of a traditional radio frequency system. The first radio frequency module 100 includes a 2G module 110 and a 5G module 120. The 2G module 110 includes a 2G power amplifier 111 operating in the 2G communication band, a 2G low-noise amplifier 112 operating in the 2G communication band, a first switch 113, and a first power detection circuit 114. The 5G module 120 includes a 5G power amplifier 121 operating in the 5G communication band, a low-noise amplifier 122 operating in the 5G communication band, a second switch 123, and a second power detection circuit 124. A duplexer 130 is also provided in the first radio frequency module 100. The structure of the second radio frequency module 140 is the same as that of the first radio frequency module 100. The third radio frequency module 150 is only for receiving, and internally includes a low-noise amplifier operating in the 2G communication band, a low-noise amplifier operating in the 5G communication band, and a switch. The structure of the fourth radio frequency module 160 is the same as that of the third radio frequency module 150. The first radio frequency module 100, the second radio frequency module 140, the third radio frequency module 150, and the fourth radio frequency module 160 are connected in sequence.Figure 1 the first antenna 131, the second antenna 141, the third antenna 151, and the fourth antenna 161 in

[0004] For Figure 1 such a solution, 16 RF connection lines are required between the RFIC (Radio Frequency Integrated Circuit) 170 and the front-end RF module. In addition, 10 control lines are required (even if a serial bus is used, 8 lines are still needed). In addition, each RF module requires at least one power line. Therefore Figure 1 a total of 30 traces need to be arranged for the 4 RF modules to connect to the RFIC 170, and the wiring is very complex.

[0005] In summary, how to effectively simplify the wiring of the RF system is a technical problem that needs to be solved urgently by those skilled in the art at present. Summary of the Invention

[0006] The object of the present invention is to provide a communication device, an RF system, and an RF front-end module to simplify the wiring.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides an RF front-end module, including: a first channel switching circuit, a first DC biasing circuit, a first coaxial cable, a second DC biasing circuit, and a first RF module;

[0009] The first channel switching circuit is respectively connected to the first control terminal of the transceiver, the N RF signal transmission terminals of the transceiver, and the first terminal of the first DC biasing circuit. The first channel switching circuit has communication channels in N frequency bands, and is used to adjust the connection relationship between the communication channels in each frequency band and the transceiver under the control of the first control terminal, so that the communication channel in the corresponding frequency band is connected to the currently specified RF signal transmission terminal for this communication channel;

[0010] The second terminal and the third terminal of the first DC biasing circuit are respectively connected to the second control terminal of the transceiver and the first terminal of the first coaxial cable, and are used to couple the RF signal at the position of its first terminal with the first control signal at the position of its second terminal, and then send it to the second DC biasing circuit through the first coaxial cable;

[0011] The third end of the second DC bias unit is connected to the second end of the first coaxial cable. After decoupling the signal received at its third end, the second DC bias unit transmits the signal to the RF signal transmission end and the first control signal transmission end of the first RF module through its first end and second end respectively, so that the first RF module performs RF signal transmission with the first antenna device under the control of the first control signal; where N is a positive integer not less than 2.

[0012] In one embodiment, N = 2. The first channel switching circuit is connected to the first RF signal transmitting end and the first RF signal receiving end of the transceiver, and the first channel switching circuit includes a first switch and a first duplexer.

[0013] The first end and the second end of the first side of the first switch are respectively connected to the first RF signal transmitting end and the first RF signal receiving end of the transceiver. The first end and the second end of the second side of the first switch are respectively connected to the first end and the second end of the first duplexer. The first switch is used to adjust the connection relationship between the ports on its first side and the ports on its second side under the control of the transceiver.

[0014] The third end of the first duplexer is connected to the first end of the first DC bias unit to transmit RF signals. The communication channel of the first frequency band of the first duplexer is between its first end and third end, and the communication channel of the second frequency band of the first duplexer is between its second end and third end.

[0015] In one embodiment, the first DC bias unit includes a first capacitor and a first inductor, and the second DC bias unit includes a second capacitor and a second inductor.

[0016] The first end of the first capacitor serves as the first end of the first DC bias unit. The second end of the first capacitor is connected to the first end of the first inductor, and the connection end serves as the third end of the first DC bias unit. The second end of the first inductor serves as the second end of the first DC bias unit.

[0017] The first end of the second capacitor serves as the first end of the second DC bias unit. The second end of the second capacitor is connected to the first end of the second inductor, and the connection end serves as the third end of the second DC bias unit. The second end of the second inductor serves as the second end of the second DC bias unit.

[0018] In one embodiment, the first radio frequency module includes: a second duplexer, a third duplexer, a first switch, a second switch, a third switch, a fourth switch, a first amplifier operating in a first frequency band for signal transmission, a second amplifier operating in the first frequency band for signal reception, a third amplifier operating in a second frequency band for signal transmission, and a fourth amplifier operating in the second frequency band for signal reception;

[0019] A first end and a second end of the second duplexer are respectively connected to a first end of the first switch and a first end of the second switch, and a third end of the second duplexer serves as a radio frequency signal transmission end of the first radio frequency module; a communication channel of the first frequency band of the second duplexer is between the first end and the third end of the second duplexer, and a communication channel of the second frequency band of the second duplexer is between the second end and the third end of the second duplexer;

[0020] A second end and a third end of the first switch are respectively connected to an input end of the first amplifier and an output end of the second amplifier, and the first end of the first switch conducts with its second end or its third end;

[0021] A second end and a third end of the second switch are respectively connected to an input end of the third amplifier and an output end of the fourth amplifier, and the first end of the second switch conducts with its second end or its third end;

[0022] A first end and a second end of the third duplexer are respectively connected to a first end of the third switch and a first end of the fourth switch, and a third end of the third duplexer serves as an antenna connection end of the first radio frequency module to connect to the first antenna device; a communication channel of the first frequency band of the third duplexer is between the first end and the third end of the third duplexer, and a communication channel of the second frequency band of the third duplexer is between the second end and the third end of the third duplexer;

[0023] A second end and a third end of the third switch are respectively connected to an output end of the first amplifier and an input end of the second amplifier, and the first end of the third switch conducts with its second end or its third end;

[0024] A second end and a third end of the fourth switch are respectively connected to an output end of the third amplifier and an input end of the fourth amplifier, and the first end of the fourth switch conducts with its second end or its third end.

[0025] In one embodiment, the first radio frequency module includes: a fifth switching switch, a sixth switching switch, a fifth amplifier operating in the first frequency band for signal transmission, a sixth amplifier operating in the first frequency band for signal reception, a seventh amplifier operating in the second frequency band for signal transmission, and an eighth amplifier operating in the second frequency band for signal reception;

[0026] The first end of the fifth switching switch serves as the radio frequency signal transmission end of the first radio frequency module. The second end, third end, fourth end, and fifth end of the fifth switching switch are respectively connected to the input end of the fifth amplifier, the output end of the sixth amplifier, the input end of the seventh amplifier, and the output end of the eighth amplifier. The first end of the fifth switching switch conducts with its second end, or with its third end, or with its fourth end, or with its fifth end;

[0027] The first end of the sixth switching switch serves as the antenna connection end of the first radio frequency module to connect to the first antenna device. The second end, third end, fourth end, and fifth end of the sixth switching switch are respectively connected to the output end of the fifth amplifier, the input end of the sixth amplifier, the output end of the seventh amplifier, and the input end of the eighth amplifier. The first end of the sixth switching switch conducts with its second end, or with its third end, or with its fourth end, or with its fifth end.

[0028] In one embodiment, it further includes: a third DC biaser, a second coaxial cable, a fourth DC biaser, and a second radio frequency module;

[0029] The first end of the third DC biaser is connected to the second radio frequency signal receiving end of the transceiver. The second end and the third end of the third DC biaser are respectively connected to the third control end of the transceiver and the first end of the second coaxial cable, and are used for coupling the radio frequency signal at the position of its first end with the second control signal at the position of its second end, and then sending it to the fourth DC biaser through the second coaxial cable;

[0030] The third end of the fourth DC biaser is connected to the second end of the second coaxial cable, and is used for decoupling the signal received at its third end, and then transmitting it to the radio frequency signal transmission end and the second control signal transmission end of the second radio frequency module through its first end and second end respectively, so that the second radio frequency module receives the radio frequency signal of the second antenna device under the control of the second control signal.

[0031] In one embodiment, the second radio frequency module includes: a seventh switching switch, an eighth switching switch, a ninth amplifier operating in the first frequency band for signal reception, and a tenth amplifier operating in the second frequency band for signal reception;

[0032] The first end of the seventh switching switch serves as the radio frequency signal transmission end of the second radio frequency module. The second end and the third end of the seventh switching switch are respectively connected to the output end of the ninth amplifier and the output end of the tenth amplifier. The first end of the seventh switching switch conducts with its second end or its third end.

[0033] The first end of the eighth switching switch serves as the antenna connection end of the second radio frequency module to connect to the second antenna device. The second end and the third end of the eighth switching switch are respectively connected to the input end of the ninth amplifier and the input end of the tenth amplifier. The first end of the eighth switching switch conducts with its second end or its third end.

[0034] In one implementation, it further includes: a second switching switch, a fourth duplexer, a third switching switch, and a fifth duplexer;

[0035] The first end and the second end of the first side of the second switching switch are respectively connected to the second radio frequency signal receiving end and the third radio frequency signal receiving end of the transceiver. The first end and the second end of the second side of the second switching switch are respectively connected to the first end and the second end of the fourth duplexer. The second switching switch is used to adjust the connection relationship between the ports on its first side and the ports on its second side under the control of the transceiver;

[0036] The third end of the fourth duplexer is connected to the first end of the third DC bias device to transmit radio frequency signals. The communication channel of the first frequency band of the fourth duplexer is between the first end and the third end of the fourth duplexer, and the communication channel of the second frequency band of the fourth duplexer is between the second end and the third end of the fourth duplexer;

[0037] The first end and the second end of the first side of the third switching switch are respectively connected to the radio frequency signal transmission end of the second radio frequency module and the power information output end of the first radio frequency module. The first end and the second end of the second side of the third switching switch are respectively connected to the first end and the second end of the fifth duplexer. The third switching switch is used to adjust the connection relationship between the ports on its first side and the ports on its second side under the control of the second radio frequency module;

[0038] The third end of the fifth duplexer is connected to the first end of the fourth DC bias device to transmit radio frequency signals and power information. The communication channel of the first frequency band of the fifth duplexer is between the first end and the third end of the fifth duplexer, and the communication channel of the second frequency band of the fifth duplexer is between the second end and the third end of the fifth duplexer.

[0039] In one embodiment, it further includes: a fifth DC bias unit, a third coaxial cable, a sixth DC bias unit, and a ninth switching switch;

[0040] The first end of the fifth DC bias unit is connected to the fourth RF signal receiving end of the transceiver. The second end and the third end of the fifth DC bias unit are respectively connected to the fourth control end of the transceiver and the first end of the third coaxial cable, and are configured to couple the RF signal at the position of its first end with the third control signal at the position of its second end, and then transmit the coupled signal to the sixth DC bias unit through the third coaxial cable;

[0041] The third end of the sixth DC bias unit is connected to the second end of the third coaxial cable, and is configured to decouple the signal received at its third end, and then transmit the decoupled signal to the first end and the control end of the ninth switching switch through its first end and second end respectively, so that the ninth switching switch controls the connection between its first end and its designated port under the control of the third control signal;

[0042] The second end to the Mth end of the ninth switching switch are respectively configured to receive M - 1 pieces of power information from different RF modules; M is a positive integer not less than 3.

[0043] In a second aspect, the present invention provides a radio frequency system, including: a transceiver, a first channel switching circuit, a first DC bias unit, a first coaxial cable, a second DC bias unit, a first RF module, and a first antenna device;

[0044] The first channel switching circuit is respectively connected to the first control end of the transceiver, the N RF signal transmission ends of the transceiver, and the first end of the first DC bias unit. The first channel switching circuit has communication channels in N frequency bands, and is configured to adjust the connection relationship between the communication channels in each frequency band and the transceiver under the control of the first control end, so that the communication channel in the corresponding frequency band is connected to the currently designated RF signal transmission end for this communication channel;

[0045] The second end and the third end of the first DC bias unit are respectively connected to the second control end of the transceiver and the first end of the first coaxial cable, and are configured to couple the RF signal at the position of its first end with the first control signal at the position of its second end, and then send the coupled signal to the second DC bias unit (50) through the first coaxial cable (40);

[0046] The third end of the second DC bias device (50) is connected to the second end of the first coaxial cable (40). After decoupling the signal received at its third end, the signal is transmitted to the RF signal transmission end and the first control signal transmission end of the first RF module (60) through its first end and second end respectively, so that the first RF module (60) performs RF signal transmission with the first antenna device (70) under the control of the first control signal; where N is a positive integer not less than 2.

[0047] In a third aspect, the present invention provides a communication device including the RF system as described above.

[0048] Applying the technical solution provided by the embodiment of the present invention, the first channel switching circuit 20 is respectively connected to the first control end of the transceiver 10, the N RF signal transmission ends of the transceiver 10, and the first end of the first DC bias device 30. The first channel switching circuit 20 has communication channels in N frequency bands and is used to adjust the connection relationship between the communication channels in each frequency band and the transceiver 10 under the control of the first control end, so that the communication channels in the corresponding frequency bands are connected to the RF signal transmission ends specified for the communication channels currently. It can be seen that through the setting of the first channel switching circuit 20, the RF signals between the first DC bias device 30 and the transceiver 10 can be divided into corresponding communication channels according to frequency bands. The second end and the third end of the first DC bias device 30 are respectively connected to the second control end of the transceiver 10 and the first end of the first coaxial cable 40, and are used to couple the RF signal at the position of its first end and the first control signal at the position of its second end, and then send the signal to the second DC bias device 50 through the first coaxial cable 40; the third end of the second DC bias device 50 is connected to the second end of the first coaxial cable 40, and is used to decouple the signal received at its third end and then transmit the signal to the RF signal transmission end and the first control signal transmission end of the first RF module 60 through its first end and second end respectively, so that the first RF module 60 performs RF signal transmission with the first antenna device 70 under the control of the first control signal. It can be seen that through the design of the first DC bias device 30, the first coaxial cable 40 and the second DC bias device 50 in the solution of the present application, the control signal and the RF signal can be transmitted through a single coaxial cable, effectively simplifying the wiring. Description of the Drawings

[0049] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0050] Figure 1 It is a schematic structural diagram of a traditional radio frequency system;

[0051] Figure 2 It is a schematic structural diagram of a radio frequency front-end module provided by a specific embodiment of the present invention;

[0052] Figure 3 It is a schematic structural diagram of a first channel switching circuit provided by a specific embodiment of the present invention;

[0053] Figure 4 It is a schematic structural diagram of a first DC biaser and a second DC biaser provided by a specific embodiment of the present invention;

[0054] Figure 5 It is a schematic structural diagram of a first radio frequency module provided by a specific embodiment of the present invention;

[0055] Figure 6 It is a schematic structural diagram of a first radio frequency module provided by another specific embodiment of the present invention;

[0056] Figure 7 It is a schematic structural diagram of a radio frequency front-end module provided by another specific embodiment of the present invention;

[0057] Figure 8 It is a schematic structural diagram of a second radio frequency module provided by a specific embodiment of the present invention;

[0058] Figure 9 It is a schematic structural diagram of a radio frequency front-end module provided by another specific embodiment of the present invention;

[0059] Figure 10 It is a schematic structural diagram of a radio frequency front-end module provided by another specific embodiment of the present invention;

[0060] Figure 11 It is a schematic structural diagram of a radio frequency front-end module provided by another specific embodiment of the present invention.

[0061] In the figure, 100 - the first RF module, 110 - 2G module, 120 - 5G module, 111 - 2G power amplifier, 112 - 2G low-noise amplifier, 113 - the first switch, 114 - the first power detection circuit, 121 - 5G power amplifier, 122 - 5G low-noise amplifier, 123 - the second switch, 124 - the second power detection circuit, 130 - duplexer, 140 - the second RF module, 150 - the third RF module, 160 - the fourth RF module, 131 - Antenna 1, 141 - Antenna 2, 151 - Antenna 3, 161 - Antenna 4, 170 - RFIC, 10 - transceiver, 20 - the first channel switching circuit, 30 - the first DC bias, 40 - the first coaxial cable, 50 - the second DC bias, 60 - the first RF module, 70 - the first antenna device, 210 - the first change-over switch, 220 - the first duplexer, 211 - the first end of the first side of the first change-over switch, 212 - the second end of the first side of the first change-over switch, 213 - the first end of the second side of the first change-over switch, 214 - the second end of the second side of the first change-over switch, 217 - the control end of the first change-over switch, 215 - the low-pass filter of the first duplexer, 216 - the high-pass filter of the first duplexer, 221 - the first end of the first duplexer, 222 - the second end of the first duplexer 220, 223 - the third end of the first duplexer 220, C1 - the first capacitor, L1 - the first inductor, C2 - the second capacitor, L2 - the second inductor, 601 - the second duplexer, 610 - the third duplexer, 602 - the first switching switch, 603 - the second switching switch, 608 - the third switching switch, 609 - the fourth switching switch, 604 - the first amplifier, 605 - the second amplifier, 606 - the third amplifier, 607 - the fourth amplifier, 611 - power detection circuit, 618 - DC-DC, 612 - the fifth switching switch, 613 - the sixth switching switch, 614 - the fifth amplifier, 615 - the sixth amplifier, 616 - the seventh amplifier, 617 - the eighth amplifier, 81 - the third DC bias, 82 - the second coaxial cable, 83 - the fourth DC bias, 80 - the second RF module, 90 - the second antenna device, 810 - the seventh switching switch, 820 - the eighth switching switch, 830 - the ninth amplifier, 840 - the tenth amplifier, 91 - the second change-over switch, 92 - the fourth duplexer, 94 - the third change-over switch, 93 - the fifth duplexer, 95 - the fifth DC bias, 96 - the third coaxial cable, 97 - the sixth DC bias, 98 - the ninth switching switch, 71 - the second channel switching circuit, 72 - the seventh DC bias, 73 - the fourth coaxial cable, 74 - the eighth DC bias, 75 - the third RF module, 76 - the third antenna device, 701 - the eighth DC bias, 702 - the fifth coaxial cable, 703 - the eighth DC bias, 704 - the fourth RF module, 705 - the fourth antenna device. Detailed implementation manners

[0062] The core of the present invention is to provide a radio frequency front-end module, which effectively simplifies the wiring.

[0063] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0064] Please refer to Figure 2 , Figure 2 , which is a schematic structural diagram of a radio frequency front-end module provided by a specific implementation manner of the present invention. The radio frequency front-end module may include: a first channel switching circuit 20, a first DC biaser 30, a first coaxial cable 40, a second DC biaser 50, and a first radio frequency module 60.

[0065] For the convenience of viewing and description, Figure 2 is a specific example where N = 2. The two radio frequency signal transmission ends of the transceiver 10 specifically refer to TX-1 and RX-1. The first channel switching circuit 20 is respectively connected to the first control terminal GPIO-1 of the transceiver 10, the N radio frequency signal transmission ends of the transceiver 10, and the first end of the first DC biaser 30. The first channel switching circuit 20 has communication channels in N frequency bands, and is used to adjust the connection relationship between the communication channels in each frequency band and the transceiver 10 under the control of the first control terminal GPIO-1 of the transceiver 10, so that the communication channel in the corresponding frequency band is connected to the radio frequency signal transmission end specified for this communication channel currently;

[0066] The second end and the third end of the first DC biaser 30 are respectively connected to the second control terminal GPIO-2 of the transceiver 10 and the first end of the first coaxial cable 40, and are used to couple the radio frequency signal at the position of its first end and the first control signal at the position of its second end, and then send the coupled signal to the second DC biaser 50 through the first coaxial cable 40;

[0067] The third end of the second DC biaser 50 is connected to the second end of the first coaxial cable 40, and is used to decouple the signal received at its third end, and then transmit the decoupled signal to the radio frequency signal transmission end and the first control signal transmission end of the first radio frequency module 60 through its first end and second end respectively, so that the first radio frequency module 60 performs radio frequency signal transmission with the first antenna device 70 under the control of the first control signal.

[0068] Specifically, in the solution of the present application, the first channel switching circuit 20 has communication channels of N frequency bands and can adjust the connection relationship between the communication channels of each frequency band of itself and the transceiver 10 under the control of the first control end of the transceiver 10. N is a positive integer not less than 2, and the specific value can be set and adjusted according to actual needs. Generally speaking, the first antenna device 70 can be a dual-band antenna, and for different frequency bands, the transmission work and the reception work can be carried out simultaneously. That is, for one of the frequency bands, the signal is currently transmitted through the first antenna device 70, and for the other frequency band, the signal can be currently received through the first antenna device 70. Therefore, N can usually be set to 2. Of course, in some other situations, when the first antenna device 70 has more working frequency bands, the first channel switching circuit 20 can also be set to a first channel switching circuit 20 with communication channels of more frequency bands according to actual needs. For the convenience of description in the following text of the present application, N = 2 is taken as an example for illustration. Figure 2 In this case, the first channel switching circuit 20 is also connected to the two radio frequency signal transmission ends of the transceiver 10, which are respectively marked as RX-1 and TX-1, representing the first radio frequency signal receiving end and the first radio frequency signal transmitting end of the transceiver 10.

[0069] The specific structure of the first channel switching circuit 20 can be set according to actual needs as long as it can meet the functional requirements of the first channel switching circuit 20 in the solution of the present application.

[0070] For reference, Figure 3 For example, in a specific embodiment of the present invention, considering that when N = 2, the required first channel switching circuit 20 can be conveniently implemented based on the first switch 210 and the first duplexer 220. Therefore, in a specific embodiment of the present invention, N = 2, the first channel switching circuit 20 is connected to the first radio frequency signal transmitting end and the first radio frequency signal receiving end of the transceiver 10, and the first channel switching circuit 20 includes a first switch 210 and a first duplexer 220;

[0071] The first end 211 and the second end 212 of the first side of the first switch 210 are respectively connected to the first radio frequency signal transmitting end TX-1 and the first radio frequency signal receiving end RX-1 of the transceiver 10. The first end 213 and the second end 214 of the second side of the first switch 210 are respectively connected to the first end 221 and the second end 222 of the first duplexer 220. The first switch 210 is used to adjust the connection relationship between the ports on the first side and the ports on the second side of itself under the control of the transceiver 10;

[0072] The third terminal 223 of the first duplexer 220 is connected to the first terminal of the first DC bias unit 30 to transmit a radio frequency signal. A communication channel for the first frequency band of the first duplexer 220 is between the first terminal 221 and the third terminal 223 of the first duplexer 220, and a communication channel for the second frequency band of the first duplexer 220 is between the second terminal 222 and the third terminal 223 of the first duplexer 220.

[0073] Refer to Figure 3 , which is a schematic structural diagram of the first channel switching circuit 20 in a specific embodiment. In this embodiment, the first switch 210 can be controlled by the transceiver 10 through its control terminal 217, so as to adjust the connection relationship between the ports on the first side and the ports on the second side of itself. That is to say, for the second-side first terminal 213 of the first switch 210, it can be selectively not connected to the port on its first side according to needs, or connected to the first-side first terminal 211 of itself, or connected to the first-side second terminal 212 of itself. Similarly, for the second-side second terminal 214 of the first switch 210, it can be selectively not connected to the port on its first side according to needs, or connected to the first-side first terminal 211 of itself, or connected to the first-side second terminal 212 of itself. Of course, generally speaking, the second-side first terminal 213 of the first switch 210 and the second-side second terminal 214 of the first switch 210 will not be simultaneously connected to the same port on the first side.

[0074] The first duplexer 220 can be composed of one low-pass filter 215 and one high-pass filter 216. The first terminal of the low-pass filter 215 serves as the first terminal 221 of the first duplexer 220 and is thus connected to the second-side first terminal 213 of the first switch 210. The first terminal of the high-pass filter 216 serves as the second terminal 222 of the first duplexer 220 and is thus connected to the second-side second terminal 214 of the first switch 210. The second terminal of the low-pass filter 215 is connected to the second terminal of the high-pass filter 216, and the connection terminal serves as the third terminal 223 of the first duplexer 220 and is connected to the first terminal of the first DC bias unit 30 to transmit a radio frequency signal.

[0075] It can be seen that in Figure 3In an implementation manner, when the first end 213 of the second side of the first switch 210 is connected to the first end 211 of the first side of the first switch 210, and the second end 214 of the second side of the first switch 210 is connected to the second end 212 of the first side of the first switch 210, the communication channel of the first frequency band of the first channel switching circuit 20 is connected to the first radio frequency signal transmitting end TX-1, and the communication channel of the second frequency band of the first channel switching circuit 20 is connected to the first radio frequency signal receiving end RX-1. Correspondingly, if the first end 213 of the second side of the first switch 210 is connected to the second end 212 of the first side of the first switch 210, and the second end 214 of the second side of the first switch 210 is connected to the first end 211 of the first side of the first switch 210, the communication channel of the first frequency band of the first channel switching circuit 20 is connected to the first radio frequency signal receiving end RX-1, and the communication channel of the second frequency band of the first channel switching circuit 20 is connected to the first radio frequency signal transmitting end TX-1.

[0076] The DC bias is the bias-T. The first DC bias 30 in the solution of the present application plays a role in signal coupling. Specifically, after coupling the radio frequency signal at its first end position with the first control signal at its second end position, it is sent to the second DC bias 50 through the first coaxial cable 40. Coupling the radio frequency signal at its first end position with the first control signal at its second end position, that is, superimposing the radio frequency signal and the first control signal, and then it can be transmitted through a single cable, rather than transmitting the radio frequency signal and the first control signal through different cables respectively.

[0077] Certainly, for the first DC bias 30, the signal received from the first coaxial cable 40 can also be sent to the first channel switching circuit 20 through the first end of the first DC bias 30.

[0078] Similarly, the second DC bias 50 can play a role in signal decoupling. Specifically, after decoupling the signal received at its third end, it is transmitted to the radio frequency signal transmission end and the first control signal transmission end of the first radio frequency module 60 through its first end and second end respectively. The second DC bias 50 decouples the signal received at its third end, that is, separates the radio frequency signal and the first control signal from the signal received at its third end, and then transmits them to the radio frequency signal transmission end of the first radio frequency module 60 and the first control signal transmission end of the first radio frequency module 60 respectively. Certainly, for the second DC bias 50, the signal received from the first radio frequency module 60, the second DC bias 50 can also send it to the first coaxial cable 40.

[0079] The specific structures of the first DC bias device 30 and the second DC bias device 50 can be set as required. In practical applications, the first DC bias device 30 and the second DC bias device 50 can usually be implemented based on an LC circuit.

[0080] For reference, Figure 4 , the first DC bias device 30 includes a first capacitor C1 and a first inductor L1, and the second DC bias device 50 includes a second capacitor C2 and a second inductor L2.

[0081] The first end of the first capacitor C1 serves as the first end of the first DC bias device 30. The second end of the first capacitor C1 is connected to the first end of the first inductor L1, and the connection end serves as the third end of the first DC bias device 30. The second end of the first inductor L1 serves as the second end of the first DC bias device 30;

[0082] The first end of the second capacitor C2 serves as the first end of the second DC bias device 50. The second end of the second capacitor C2 is connected to the first end of the second inductor L2, and the connection end serves as the third end of the second DC bias device 50. The second end of the second inductor L2 serves as the second end of the second DC bias device 50.

[0083] In this embodiment, the first DC bias device 30 is implemented by the first capacitor C1 and the first inductor L1, and the second DC bias device 50 is implemented by the second capacitor C2 and the second inductor L2. The structure is simple and the reliability is high.

[0084] In addition, the first coaxial cable 40 generally consists of an inner conductor, an inner insulating layer, a shielding layer, and an outer protective sleeve. For example, the RG-174 / U radio frequency cable can be specifically used as the first coaxial cable 40 required by this application. In addition Figure 4 The VDD marked therein refers to the input of a DC signal at the port on the shielding layer of the first coaxial cable 40.

[0085] The second DC bias device 50 transmits the decoupled signals to the radio frequency signal transmission end and the first control signal transmission end of the first radio frequency module 60 respectively, which can enable the first radio frequency module 60 to perform radio frequency signal transmission with the first antenna device 70 under the control of the first control signal.

[0086] The specific structure of the first radio frequency module 60 can be set and adjusted according to actual needs. In an embodiment of the present invention, it is considered that the required first radio frequency module 60 can be implemented based on a duplexer and a switching switch. For reference, Figure 5, the first radio frequency module 60 may specifically include: a second duplexer 601, a third duplexer 610, a first switch 602, a second switch 603, a third switch 608, a fourth switch 609, a first amplifier 604 operating in the first frequency band for signal transmission, a second amplifier 605 operating in the first frequency band for signal reception, a third amplifier 606 operating in the second frequency band for signal transmission, and a fourth amplifier 607 operating in the second frequency band for signal reception;

[0087] The first end and the second end of the second duplexer 601 are respectively connected to the first end of the first switch 602 and the first end of the second switch 603, and the third end of the second duplexer 601 serves as the radio frequency signal transmission end of the first radio frequency module 60; the communication channel of the first frequency band of the second duplexer 601 is between the first end and the third end of the second duplexer 601, and the communication channel of the second frequency band of the second duplexer 601 is between the second end and the third end of the second duplexer 601;

[0088] The second end and the third end of the first switch 602 are respectively connected to the input end of the first amplifier 604 and the output end of the second amplifier 605, and the first end of the first switch 602 is conducted with its second end or its third end;

[0089] The second end and the third end of the second switch 603 are respectively connected to the input end of the third amplifier 606 and the output end of the fourth amplifier 607, and the first end of the second switch 603 is conducted with its second end or its third end;

[0090] The first end and the second end of the third duplexer 610 are respectively connected to the first end of the third switch 608 and the first end of the fourth switch 609, and the third end of the third duplexer 610 serves as the antenna connection end of the first radio frequency module 60 to connect to the first antenna device 70; the communication channel of the first frequency band of the third duplexer 610 is between the first end and the third end of the third duplexer 610, and the communication channel of the second frequency band of the third duplexer 610 is between the second end and the third end of the third duplexer 610;

[0091] The second end and the third end of the third switch 608 are respectively connected to the output end of the first amplifier 604 and the input end of the second amplifier 605, and the first end of the third switch 608 is conducted with its second end or its third end;

[0092] The second end and the third end of the fourth switch 609 are respectively connected to the output end of the third amplifier 606 and the input end of the fourth amplifier 607, and the first end of the fourth switch 609 is conducted with its second end or its third end;

[0093] A first register may be provided in the first radio frequency module 60. The first register is used to store the received first control signal and control the states of the controllable devices in the first radio frequency module 60 based on the first control signal.

[0094] Specifically, the first amplifier 604 is, for example, a power amplifier operating in the 2G band, i.e., 2G PA, and the second amplifier 605 is a low-noise amplifier operating in the 2G band, i.e., 2G LNA. The third amplifier 606 is, for example, a power amplifier operating in the 5G band, i.e., 5G PA, and the fourth amplifier 607 is a low-noise amplifier operating in the 5G band, i.e., 5G LNA.

[0095] From Figure 5 the circuit structure, it can be seen that the first switching switch 602 is a single-pole double-throw switch. For the first amplifier 604 and the second amplifier 605 operating in the first frequency band, by controlling the state of the first switching switch 602, one of them can be connected to the second duplexer 601. Specifically, it can be connected to the radio frequency signal transmission end of the first radio frequency module 60 through the communication channel of the first frequency band of the second duplexer 601. The radio frequency signal transmission end of the first radio frequency module 60 is denoted as IN in Figure 5 . And it can be understood that when the first amplifier 604 is selected to be connected to the second duplexer 601, it means that the first amplifier 604 needs to work at this time. The third switching switch 608 is also a single-pole double-throw switch. At this time, it is necessary to control the third switching switch 608 to connect the first amplifier 604 to the third duplexer 610. Specifically, it can be connected to the antenna connection end of the first radio frequency module 60 through the communication channel of the first frequency band of the third duplexer 610. The antenna connection end of the first radio frequency module 60 is denoted as OUT in Figure 5 .

[0096] Correspondingly, if the state of the first switching switch 602 is controlled such that the second amplifier 605 is connected to the second duplexer 601, it means that the second amplifier 605 needs to work at this time. It is necessary to control the first switching switch 602 to connect the second amplifier 605 to the second duplexer 601. Specifically, it is connected to the radio frequency signal transmission end IN of the first radio frequency module 60 through the communication channel of the first frequency band of the second duplexer 601. At this time, it is necessary to control the third switching switch 608 to connect the second amplifier 605 to the third duplexer 610. Specifically, it is connected to the antenna connection end OUT of the first radio frequency module 60 through the communication channel of the first frequency band of the third duplexer 610.

[0097] The second switching switch 603 is also a single-pole double-throw switch. For the third amplifier 606 and the fourth amplifier 607 operating in the second frequency band, by controlling the state of the second switching switch 603, either one of them can be connected to the second duplexer 601, specifically through the communication channel of the second frequency band of the second duplexer 601 to the radio frequency signal transmission end IN of the first radio frequency module 60. And it can be understood that when selecting to connect the third amplifier 606 to the second duplexer 601, at this time, it is necessary to control the fourth switching switch 609 to connect the third amplifier 606 to the third duplexer 610, specifically through the communication channel of the second frequency band of the third duplexer 610 to the antenna connection end OUT of the first radio frequency module 60.

[0098] Correspondingly, if the state of the second switching switch 603 is controlled so that the fourth amplifier 607 is connected to the second duplexer 601, it means that the second amplifier 605 needs to work at this time. Then, it is necessary to control the second switching switch 603 to connect the fourth amplifier 607 to the second duplexer 601, specifically through the communication channel of the second frequency band of the second duplexer 601 to the radio frequency signal transmission end IN of the first radio frequency module 60. At this time, it is necessary to control the fourth switching switch 609 to connect the fourth amplifier 607 to the third duplexer 610, specifically through the communication channel of the second frequency band of the third duplexer 610 to the antenna connection end OUT of the first radio frequency module 60.

[0099] It can be seen that for Figure 5 the first radio frequency module 60, through the design of the corresponding switching switches and duplexers, the first radio frequency module 60 with dual-band 1T1R (dual-band single receive and single transmit) is realized.

[0100] In addition, Figure 5 the first register is not shown in. In actual application, the first register needs to be directly or indirectly connected to the control signal transmission end of the first radio frequency module 60 so that the first register can store the received first control signal. The control signal transmission end of the first radio frequency module 60 is denoted as GPIO-IN in Figure 5 . The specific content of the first control signal determines the states of the controllable devices in the first radio frequency module 60, that is, determines the states of the switching switches in the first radio frequency module 60. In addition, in some cases, each amplifier in the first radio frequency module 60 and the power detection circuit 611 described in the following embodiments are also controllable devices.

[0101] In addition Figure 5 in the example of, a DC-DC 618 is also integrated in the first radio frequency module 60, for example, specifically 36V - 5V. The input of high voltage can reduce the power loss.

[0102] For reference,Figure 6 In a specific embodiment of the present invention, the first radio frequency module 60 includes: a fifth switch 612, a sixth switch 613, a fifth amplifier 614 operating in the first frequency band for signal transmission, a sixth amplifier 615 operating in the first frequency band for signal reception, a seventh amplifier 616 operating in the second frequency band for signal transmission, and an eighth amplifier 617 operating in the second frequency band for signal reception;

[0103] The first end of the fifth switch 612 serves as the radio frequency signal transmission end of the first radio frequency module 60. The second, third, fourth, and fifth ends of the fifth switch 612 are respectively connected to the input end of the fifth amplifier 614, the output end of the sixth amplifier 615, the input end of the seventh amplifier 616, and the output end of the eighth amplifier 617. The first end of the fifth switch 612 is conductively connected to its second end, or its third end, or its fourth end, or its fifth end;

[0104] The first end of the sixth switch 613 serves as the antenna connection end of the first radio frequency module 60 to connect to the first antenna device 70. The second, third, fourth, and fifth ends of the sixth switch 613 are respectively connected to the output end of the fifth amplifier 614, the input end of the sixth amplifier 615, the output end of the seventh amplifier 616, and the input end of the eighth amplifier 617. The first end of the sixth switch 613 is conductively connected to its second end, or its third end, or its fourth end, or its fifth end.

[0105] In the above Figure 5 embodiment, a design using 4 single-pole double-throw switches and 2 duplexers is used to implement the first radio frequency module 60. This embodiment is based on the fifth switch 612 and the sixth switch 613 to implement the first radio frequency module 60. Both the fifth switch 612 and the sixth switch 613 are single-pole four-throw switches. And from the circuit structure, for the first radio frequency module 60 of this embodiment, only one of the first frequency band and the second frequency band can work and they cannot work simultaneously. Therefore, there is no need to set a duplexer to avoid interference between different frequency bands. In addition, similarly to the above, Figure 6 in the embodiment, a second register may be provided in the first radio frequency module 60. The second register is used to store the received first control signal and control the states of the controllable devices in the first radio frequency module 60 based on the first control signal, Figure 6 and the second register is not shown in

[0106] Reference may be made to Figure 7, in a specific embodiment of the present invention, it may further include: a third DC bias device 81, a second coaxial cable 82, a fourth DC bias device 83, and a second RF module 80.

[0107] The first end of the third DC bias device 81 is connected to the second RF signal receiving end of the transceiver 10, and the second end and the third end of the third DC bias device 81 are respectively connected to the third control end of the transceiver 10 and the first end of the second coaxial cable 82, and are used for coupling the RF signal at the position of its first end with the second control signal at the position of its second end, and then sending it to the fourth DC bias device 83 through the second coaxial cable 82;

[0108] The third end of the fourth DC bias device 83 is connected to the second end of the second coaxial cable 82, and is used for decoupling the signal received at its third end, and then transmitting it to the RF signal transmission end and the second control signal transmission end of the second RF module 80 through its first end and second end respectively, so that the second RF module 80 receives the RF signal of the second antenna device 90 under the control of the second control signal.

[0109] Reference can be made to Figure 7 , in this embodiment, it is considered that in addition to setting an RF module that can both transmit signals to the antenna device and receive signals from the antenna device, in practical applications, several RF modules that are only used for receiving signals can also be set, that is, the second RF module 80 in this embodiment.

[0110] Since only signal reception is required, the third DC bias device 81 needs to be connected to the second RF signal receiving end and the third control end of the transceiver 10 respectively. Figure 7 The second RF signal receiving end in is denoted as RX-2, and the third control end is denoted as GPIO-3.

[0111] In this embodiment, through coupling and decoupling, the transceiver 10 can transmit the second control signal to the second RF module 80 based on the second coaxial cable 82. At the same time, the RF signal of the second antenna device 90 received by the second RF module 80 can be sent to the transceiver 10 through coupling and decoupling. The third DC bias device 81 and the fourth DC bias device 83 can both adopt the above-mentioned LC circuit design, which has a simple structure and high reliability.

[0112] The specific structure of the second RF module 80 can be set and adjusted according to needs. For example, in a specific embodiment of the present invention, reference can be made to Figure 8 , the second RF module 80 may specifically include: a seventh switch 810, an eighth switch 820, a ninth amplifier 830 operating in the first frequency band for signal reception, and a tenth amplifier 840 operating in the second frequency band for signal reception;

[0113] The first terminal of the seventh switching switch 810 serves as the RF signal transmission terminal of the second RF module 80. The second terminal and the third terminal of the seventh switching switch 810 are respectively connected to the output terminal of the ninth amplifier 830 and the output terminal of the tenth amplifier 840. The first terminal of the seventh switching switch 810 is conducted with its second terminal or its third terminal.

[0114] The first terminal of the eighth switching switch 820 serves as the antenna connection terminal of the second RF module 80 to connect to the second antenna device 90. The second terminal and the third terminal of the eighth switching switch 820 are respectively connected to the input terminal of the ninth amplifier 830 and the input terminal of the tenth amplifier 840. The first terminal of the eighth switching switch 820 is conducted with its second terminal or its third terminal.

[0115] From Figure 8 the circuit structure, it can be seen that both the seventh switching switch 810 and the eighth switching switch 820 are single-pole double-throw switches. By controlling the states of the seventh switching switch 810 and the eighth switching switch 820, it can be determined whether the RF signal received by the second RF module 80 from the second antenna device 90 is sent to the fourth DC bias device 83 through the ninth amplifier 830 or through the tenth amplifier 840. Figure 8 In, the antenna connection terminal of the second RF module 80 is denoted as RFIN, the RF signal transmission terminal of the second RF module 80 is denoted as RFOUT, and the RF signal transmission terminal of the second RF module 80 is denoted as GPIO-IN.

[0116] A third register may be provided in the second RF module 80. The third register is used to store the received second control signal and control the states of the controllable devices in the second RF module 80 based on the second control signal. Figure 8 The third register is not shown in. In practical applications, the third register needs to be directly or indirectly connected to the control signal transmission terminal GPIO-IN of the second RF module 80 so that the third register can store the received second control signal, and the content of the second control signal determines the states of the controllable devices in the second RF module 80. In addition Figure 8 in the example of, a regulator 850 is also shown in the second RF module 80. It is a power supply regulator and can provide the required voltage level of power supply for the devices that need to be powered in the second RF module 80.

[0117] It can be referred to Figure 9 , in a specific embodiment of the present invention, it may further include: a second switching switch 91, a fourth duplexer 92, a third switching switch 94, and a fifth duplexer 93;

[0118] The first end and the second end of the first side of the second conversion switch 91 are respectively connected to the second radio frequency signal receiving end and the third radio frequency signal receiving end of the transceiver 10. The first end and the second end of the second side of the second conversion switch 91 are respectively connected to the first end and the second end of the fourth duplexer 92. The second conversion switch 91 is used to adjust the connection relationship between the ports on its first side and the ports on its second side under the control of the transceiver 10;

[0119] The third end of the fourth duplexer 92 is connected to the first end of the third DC bias device 81 to transmit radio frequency signals. The communication channel of the first frequency band of the fourth duplexer 92 is between the first end and the third end of the fourth duplexer 92. The communication channel of the second frequency band of the fourth duplexer 92 is between the second end and the third end of the fourth duplexer 92;

[0120] The first end and the second end of the first side of the third conversion switch 94 are respectively connected to the radio frequency signal transmission end of the second radio frequency module 80 and the power information output end of the first radio frequency module 60. The first end and the second end of the second side of the third conversion switch 94 are respectively connected to the first end and the second end of the fifth duplexer 93. The third conversion switch 94 is used to adjust the connection relationship between the ports on its first side and the ports on its second side under the control of the second radio frequency module 80;

[0121] The third end of the fifth duplexer 93 is connected to the first end of the fourth DC bias device 83 to transmit radio frequency signals and power information. The communication channel of the first frequency band of the fifth duplexer 93 is between the first end and the third end of the fifth duplexer 93. The communication channel of the second frequency band of the fifth duplexer 93 is between the second end and the third end of the fifth duplexer 93.

[0122] In some embodiments, some radio frequency modules need to detect their own power information, usually specifically detect the magnitude of their output power, and then feedback the power information to the transceiver 10. For example, in some cases, based on the power information of the radio frequency module, the transceiver 10 can execute the CFR and / or DPD algorithms to perform the IM3 cancellation operation of the power amplifier of the corresponding radio frequency module to reduce noise interference.

[0123] The power information can be detected by a power detection circuit. For example, in the above Figure 5 example, a power detection circuit 611 is provided at the antenna connection end position of the first radio frequency module 60, and the detected is the output power of the first radio frequency module 60, which can be output through the CPL port.

[0124] This embodiment takes into account that the power information of the first radio frequency module 60 can be transmitted to the transceiver 10 through a dedicated line. However, if it is transmitted using the second coaxial cable 82, it is beneficial to further reduce the wiring complexity. In this regard, two channel switching circuits need to be set up in this embodiment. One specifically includes a second switch 91 and a fourth duplexer 92, which are set at a position close to the transceiver 10. The other includes a third switch 94 and a fifth duplexer 93, which are set at a position close to the second antenna device 90. In addition, in practical applications, the second switch 91, the third switch 94, and the first switch 210 mentioned above are usually set to the same model to reduce production costs. Similarly, the duplexers in each embodiment are usually duplexers of the same model. That is to say, in the above embodiment, the first channel switching circuit 20 includes a first switch 210 + a first duplexer 220. In this embodiment, the third switch 94 + the fifth duplexer 93 can have the same structure as the first channel switching circuit 20 mentioned above. Similarly, the second switch 91 + the fourth duplexer 92 can also have the same structure as the first channel switching circuit 20 mentioned above, which is convenient for realizing the reuse of devices, reducing the demand for device types, and reducing production costs. In addition, it can be understood that whether it is the first channel switching circuit 20 mentioned above, or the first switch 210 + the first duplexer 220 in this embodiment, and the third switch 94 + the fifth duplexer 93, they can all enable the TX and RX of different channels to work simultaneously.

[0125] In this embodiment, from Figure 9 the circuit structure, it can be seen that after the third switch 94 and the fifth duplexer 93 are set, both the power information and the radio frequency signal output by the second radio frequency module 80 can be sent to the fourth DC bias 83, and then after coupling, they are transmitted to the third DC bias 81 through the second coaxial cable 82, and then through the fourth duplexer 92 and the second switch 91, the radio frequency signal and the power information are respectively sent to the second radio frequency signal receiving end RX-2 and the third radio frequency signal receiving end RX-3 of the transceiver 10.

[0126] In addition, it can be understood that both the second switch 91 and the third switch 94 need to be controlled. Since the second switch 91 is close to the transceiver 10, the relevant ports of the transceiver 10 can be used to control the state of the second switch 91 to adjust the connection relationship between the ports on the first side and the ports on the second side of the second switch 91. Figure 9 The port of the transceiver 10 used to control the second switch 91 is denoted as GPIO-5. Since the third switch 94 is close to the second radio frequency module 80, the relevant ports of the second radio frequency module 80 are usually used to control the state of the third switch 94. Figure 9In and above Figure 8 In the figure, the port of the second RF module 80 used to control the third switch 94 is recorded as GPIO-OUT.

[0127] In addition, it should be noted that for the type of the first RF module 60 described above, there may be one or more RF modules. Similarly, for the type of the second RF module 80 described above, there may also be one or more RF modules. It can be set according to actual needs.

[0128] For easier understanding, please refer to Figure 11 , Figure 11 In the case of, for the type of RF module of the first RF module 60 described above, specifically, two are set, namely Figure 11 The first RF module 60 and the third RF module 75, Figure 11 In the figure, the third RF module 75 is connected to the third antenna device 76, and is connected to the transceiver 10 through the second channel switching circuit 71, the seventh DC bias device 72, the fourth coaxial cable 73 and the eighth DC bias device 74. Since the principle is the same as above, it will not be repeated.

[0129] Likewise, Figure 11 In the case of, for the second RF module 80 described above, this type of RF module is specifically provided with two, namely Figure 11 The second RF module 80 and the fourth RF module 704, Figure 11 In the figure, the fourth RF module 704 is connected to the fourth antenna device 705, and is connected to the transceiver 10 through the eighth DC bias device 701, the fifth coaxial cable 702 and the eighth DC bias device 703. Since the principle is the same as above, it will not be repeated.

[0130] And, for example, in Figure 11 In the case of, the first RF module 60 and the third RF module 75 specifically adopt the above Figure 5 The second RF module 80 and the fourth RF module 704 specifically adopt the above Figure 8 In the structural form, at this time, it can be achieved that when there are two channels in the 5G frequency band, 4 channels of reception in the 2G frequency band can be supported at the same time. For example, the first RF module 60 is used for 5G transmission and 2G reception at the same time, and the third RF module 75 is also used for 5G transmission and 2G reception at the same time. The second RF module 80 and the fourth RF module 704 are both used for 2G reception, so that when there are two channels in the 5G frequency band, 4 channels of reception in the 2G frequency band can be supported at the same time. Similarly, in this implementation, when there are two channels in the 2G frequency band, 4 channels of reception in the 5G frequency band can be supported at the same time. In addition, it can be understood that this implementation also supports the simultaneous transmission of 1 2G frequency band and 1 5G frequency band.

[0131] For example, in the case of Figure 11 , the first radio frequency module 60 and the third radio frequency module 75 specifically adopt the structural form described above Figure 6 , and the second radio frequency module 80 and the fourth radio frequency module 704 specifically adopt the structural form described above Figure 8 . At this time, when two paths in the 5G frequency band are transmitting, it is possible to support two-way reception in the 2G frequency band at the same time. For example, both the first radio frequency module 60 and the third radio frequency module 75 are used for 5G transmission, and the second radio frequency module 80 and the fourth radio frequency module 704 are both used for 2G reception, thus realizing that when two paths in the 5G frequency band are transmitting, two-way reception in the 2G frequency band is supported at the same time. Similarly, in this implementation manner, when two paths in the 2G frequency band are transmitting, two-way reception in the 5G frequency band is supported at the same time. It also supports simultaneous transmission of one 2G frequency band and one 5G frequency band.

[0132] In addition, Figure 11 also shows the specific structure of the transceiver 10, which is specifically composed of 4 transceiver units, and also shows the modulation and demodulation device (Modem) connected to the transceiver 10. In the transceiver unit for connecting the first radio frequency module 60, a filter, a mixer, an oscillator, a driver amplifier, and a low-noise amplifier are specifically provided. In the transceiver unit for connecting the second radio frequency module 80, a filter, a mixer, an oscillator, and a low-noise amplifier are specifically provided.

[0133] In addition, it can be understood that when multiple radio frequency modules of the type of the first radio frequency module 60 and radio frequency modules of the type of the second radio frequency module 80 described above are provided, for the power information from different radio frequency modules, the transceiver unit can complete reception using different radio frequency signal receiving ends, or can also complete reception using the same radio frequency signal receiving end. For example, only one single-pole multi-throw switch needs to be set at the position of the third radio frequency signal receiving end RX-3. The fixed end of the single-pole multi-throw switch is respectively connected to the corresponding changeover switch to receive the power information from different radio frequency modules, and the moving end of the single-pole multi-throw switch is connected to the third radio frequency signal receiving end RX-3, so that the same radio frequency signal receiving end can be used to complete the reception of the power information from different radio frequency modules in a time-division multiplexing manner.

[0134] Reference can be made to Figure 10 . In a specific implementation manner of the present invention, it further includes: a fifth DC bias 95, a third coaxial cable 96, a sixth DC bias 97, and a ninth switch 98;

[0135] The first end of the fifth DC bias 95 is connected to the fourth RF signal receiving end of the transceiver 10. The second and third ends of the fifth DC bias 95 are respectively connected to the fourth control end of the transceiver 10 and the first end of the third coaxial cable 96, and are used for coupling the RF signal at the position of its first end and the third control signal at the position of its second end, and then transmitting the coupled signal to the sixth DC bias 97 through the third coaxial cable 96;

[0136] The third end of the sixth DC bias 97 is connected to the second end of the third coaxial cable 96, and is used for decoupling the signal received at its third end, and then transmitting the decoupled signal to the first end and the control end of the ninth switch 98 through its first and second ends respectively, so that the ninth switch 98 controls the connection between its first end and its designated port under the control of the third control signal;

[0137] The second to M-th ends of the ninth switch 98 are respectively used for receiving M - 1 power information sources from different RF modules; M is a positive integer not less than 3. In Figure 10 the example, the power information sources from different RF modules are denoted as CP1, CP2, up to CP(M - 1) in sequence.

[0138] This implementation mode takes into account that, in the implementation mode above Figure 9 the second coaxial cable 82 is reused to transmit the power information of the first RF module 60, and corresponding conversion switches and duplexers need to be additionally provided. This implementation mode takes into account that a dedicated line can be used to transmit the power information sources from each RF module.

[0139] In addition, it should be noted that since the third coaxial cable 96 in this implementation mode only needs to be used to transmit the power information of the RF module and the current in the line is very small, the third coaxial cable 96 can also be replaced by a flexible flat cable to reduce complexity and cost.

[0140] Applying the technical solution provided by the embodiment of the present invention, the first channel switching circuit 20 is respectively connected to the first control end of the transceiver 10, the N radio frequency signal transmission ends of the transceiver 10, and the first end of the first DC bias device 30. The first channel switching circuit 20 has communication channels in N frequency bands, and is used to adjust the connection relationship between the communication channels in each frequency band and the transceiver 10 under the control of the first control end, so that the communication channels in the corresponding frequency bands are connected to the radio frequency signal transmission ends specified for the communication channels currently. It can be seen that through the setting of the first channel switching circuit 20, the radio frequency signals between the first DC bias device 30 and the transceiver 10 can be divided into corresponding communication channels according to the frequency bands. The second end and the third end of the first DC bias device 30 are respectively connected to the second control end of the transceiver 10 and the first end of the first coaxial cable 40, and are used to couple the radio frequency signal at the first end position of itself and the first control signal at the second end position of itself, and then send the coupled signal to the second DC bias device 50 through the first coaxial cable 40; the third end of the second DC bias device 50 is connected to the second end of the first coaxial cable 40, and is used to decouple the signal received at the third end of itself, and then transmit the decoupled signal to the radio frequency signal transmission end and the first control signal transmission end of the first radio frequency module 60 through the first end and the second end of itself respectively, so that the first radio frequency module 60 performs radio frequency signal transmission with the first antenna device 70 under the control of the first control signal. It can be seen that through the design of the first DC bias device 30, the first coaxial cable 40 and the second DC bias device 50 in the solution of the present application, the control signal and the radio frequency signal can be transmitted through a single coaxial cable, effectively simplifying the wiring.

[0141] Corresponding to the embodiment of the above radio frequency front-end module, the embodiment of the present invention further provides a radio frequency system, which can be mutually corresponding and referenced with the above text. The radio frequency system may include: a transceiver 10, a first channel switching circuit 20, a first DC bias device 30, a first coaxial cable 40, a second DC bias device 50, a first radio frequency module 60, and a first antenna device 70;

[0142] The first channel switching circuit 20 is respectively connected to the first control end of the transceiver 10, the N radio frequency signal transmission ends of the transceiver 10, and the first end of the first DC bias device 30. The first channel switching circuit 20 has communication channels in N frequency bands, and is used to adjust the connection relationship between the communication channels in each frequency band and the transceiver 10 under the control of the first control end, so that the communication channels in the corresponding frequency bands are connected to the radio frequency signal transmission ends specified for the communication channels currently.

[0143] The second end and the third end of the first DC bias unit 30 are respectively connected to the second control end of the transceiver 10 and the first end of the first coaxial cable 40, and are configured to couple the RF signal at the position of its first end and the first control signal at the position of its second end, and then send the coupled signal to the second DC bias unit 50 through the first coaxial cable 40;

[0144] The third end of the second DC bias unit 50 is connected to the second end of the first coaxial cable 40, and is configured to decouple the signal received at its third end, and then transmit the decoupled signal to the RF signal transmission end and the first control signal transmission end of the first RF module 60 through its first end and second end respectively, so that the first RF module 60 performs RF signal transmission with the first antenna device 70 under the control of the first control signal; where N is a positive integer not less than 2.

[0145] Corresponding to the above embodiments of the RF system, the present invention further provides a communication device, which can be correspondingly referred to the above, and the communication device may include the above RF system.

[0146] It should also be noted that in this application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0147] Those skilled in the art can further realize that the units and algorithm steps of each example described in combination with the embodiments disclosed in this application can be implemented by electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention. Specific examples are applied in this application to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A radio frequency front-end module, characterized in that: include: A first channel switching circuit (20), a first DC bias device (30), a first coaxial cable (40), a second DC bias device (50) and a first radio frequency module (60); The first channel switching circuit (20) is respectively connected to a first control end of the transceiver (10), N radio frequency signal transmission ends of the transceiver (10), and a first end of the first DC bias device (30); the first channel switching circuit (20) has communication channels of N frequency bands, and is used to adjust the connection relationship between the communication channels of each frequency band and the transceiver (10) under the control of the first control end, so that the communication channel of the corresponding frequency band is connected to the radio frequency signal transmission end currently designated for the communication channel; The second end and the third end of the first DC bias device (30) are respectively connected to the second control end of the transceiver (10) and the first end of the first coaxial cable (40), and are used to couple the radio frequency signal at the first end thereof with the first control signal at the second end thereof, and then send the coupled signals to the second DC bias device (50) through the first coaxial cable (40); The third end of the second DC bias device (50) is connected to the second end of the first coaxial cable (40), and is used to decouple the signal received by its third end and transmit it to the RF signal transmission end and the first control signal transmission end of the first RF module (60) through its first end and second end respectively, so that the first RF module (60) can transmit the RF signal to the first antenna device (70) under the control of the first control signal; wherein N is a positive integer not less than 2.

2. The RF front-end module according to claim 1, characterized in that: N=2, the first channel switching circuit (20) is connected to a first radio frequency signal transmitting end and a first radio frequency signal receiving end of the transceiver (10), and the first channel switching circuit (20) comprises a first conversion switch (210) and a first duplexer (220); The first end of the first side and the second end of the first side of the first conversion switch (210) are respectively connected to the first radio frequency signal transmitting end and the first radio frequency signal receiving end of the transceiver (10); the first end of the second side and the second end of the second side of the first conversion switch (210) are respectively connected to the first end and the second end of the first duplexer (220); the first conversion switch (210) is used to adjust the connection relationship between each port on the first side and each port on the second side of the first conversion switch under the control of the transceiver (10); The third end of the first duplexer (220) is connected to the first end of the first DC bias device (30) to transmit a radio frequency signal; a communication channel of a first frequency band of the first duplexer (220) is located between the first end and the third end; and a communication channel of a second frequency band of the first duplexer (220) is located between the second end and the third end.

3. The RF front-end module according to claim 1, characterized in that: The first DC bias device (30) comprises a first capacitor (C1) and a first inductor (L1), and the second DC bias device (50) comprises a second capacitor (C2) and a second inductor (L2); The first end of the first capacitor (C1) serves as the first end of the first DC bias device (30), the second end of the first capacitor (C1) is connected to the first end of the first inductor (L1) and the connection end serves as the third end of the first DC bias device (30), and the second end of the first inductor (L1) serves as the second end of the first DC bias device (30); The first end of the second capacitor (C2) serves as the first end of the second DC bias device (50), the second end of the second capacitor (C2) is connected to the first end of the second inductor (L2) and the connection end serves as the third end of the second DC bias device (50), and the second end of the second inductor (L2) serves as the second end of the second DC bias device (50).

4. The RF front-end module according to claim 1, characterized in that: The first radio frequency module (60) comprises: a second duplexer (601), a third duplexer (610), a first switch (602), a second switch (603), a third switch (608), a fourth switch (609), a first amplifier (604) working in the first frequency band for signal transmission, a second amplifier (605) working in the first frequency band for signal reception, a third amplifier (606) working in the second frequency band for signal transmission, and a fourth amplifier (607) working in the second frequency band for signal reception; The first end and the second end of the second duplexer (601) are respectively connected to the first end of the first switch (602) and the first end of the second switch (603); the third end of the second duplexer (601) serves as the radio frequency signal transmission end of the first radio frequency module (60); the first end and the third end of the second duplexer (601) are the communication channels of the first frequency band of the second duplexer (601); the second end and the third end of the second duplexer (601) are the communication channels of the second frequency band of the second duplexer (601); The second end and the third end of the first switching switch (602) are connected to the input end of the first amplifier (604) and the output end of the second amplifier (605) respectively, and the first end of the first switching switch (602) is connected to the second end thereof or to the third end thereof; The second end and the third end of the second switch (603) are connected to the input end of the third amplifier (606) and the output end of the fourth amplifier (607) respectively, and the first end of the second switch (603) is connected to the second end thereof or to the third end thereof; The first end and the second end of the third duplexer (610) are respectively connected to the first end of the third switch (608) and the first end of the fourth switch (609); the third end of the third duplexer (610) serves as the antenna connection end of the first radio frequency module (60) to connect to the first antenna device (70); between the first end and the third end of the third duplexer (610) is a communication channel of the first frequency band of the third duplexer (610), and between the second end and the third end of the third duplexer (610) is a communication channel of the second frequency band of the third duplexer (610); The second end and the third end of the third switch (608) are connected to the output end of the first amplifier (604) and the input end of the second amplifier (605) respectively, and the first end of the third switch (608) is connected to the second end thereof or to the third end thereof; The second end and the third end of the fourth switching switch (609) are respectively connected to the output end of the third amplifier (606) and the input end of the fourth amplifier (607), and the first end of the fourth switching switch (609) is connected to its own second end or to its own third end.

5. The RF front-end module according to claim 1, characterized in that: The first radio frequency module (60) comprises: a fifth switch (612), a sixth switch (613), a fifth amplifier (614) operating in the first frequency band for signal transmission, a sixth amplifier (615) operating in the first frequency band for signal reception, a seventh amplifier (616) operating in the second frequency band for signal transmission, and an eighth amplifier (617) operating in the second frequency band for signal reception; The first end of the fifth switching switch (612) serves as the radio frequency signal transmission end of the first radio frequency module (60); the second end, the third end, the fourth end and the fifth end of the fifth switching switch (612) are respectively connected to the input end of the fifth amplifier (614), the output end of the sixth amplifier (615), the input end of the seventh amplifier (616) and the output end of the eighth amplifier (617); the first end of the fifth switching switch (612) is connected to the second end thereof, or is connected to the third end thereof, or is connected to the fourth end thereof, or is connected to the fifth end thereof; The first end of the sixth switching switch (613) serves as the antenna connection end of the first radio frequency module (60) to connect to the first antenna device (70); the second end, the third end, the fourth end and the fifth end of the sixth switching switch (613) are respectively connected to the output end of the fifth amplifier (614), the input end of the sixth amplifier (615), the output end of the seventh amplifier (616) and the input end of the eighth amplifier (617); the first end of the sixth switching switch (613) is connected to its own second end, or is connected to its own third end, or is connected to its own fourth end, or is connected to its own fifth end.

6. The RF front-end module according to claim 1, characterized in that: It also includes: a third DC bias device (81), a second coaxial cable (82), a fourth DC bias device (83) and a second radio frequency module (80); The first end of the third DC bias device (81) is connected to the second radio frequency signal receiving end of the transceiver (10), and the second end and the third end of the third DC bias device (81) are respectively connected to the third control end of the transceiver (10) and the first end of the second coaxial cable (82), so as to couple the radio frequency signal at the first end thereof with the second control signal at the second end thereof, and then send the coupled signals to the fourth DC bias device (83) through the second coaxial cable (82); The third end of the fourth DC bias device (83) is connected to the second end of the second coaxial cable (82), and is used to decouple the signal received by its third end and transmit it to the RF signal transmission end and the second control signal transmission end of the second RF module (80) through its first end and second end respectively, so that the second RF module (80) receives the RF signal of the second antenna device (90) under the control of the second control signal.

7. The radio frequency front-end module according to claim 6, characterized in that: The second radio frequency module (80) comprises: a seventh switch (810), an eighth switch (820), a ninth amplifier (830) operating in the first frequency band for receiving signals, and a tenth amplifier (840) operating in the second frequency band for receiving signals; The first end of the seventh switch (810) serves as the radio frequency signal transmission end of the second radio frequency module (80), the second end and the third end of the seventh switch (810) are respectively connected to the output end of the ninth amplifier (830) and the output end of the tenth amplifier (840), and the first end of the seventh switch (810) is connected to the second end thereof or to the third end thereof; The first end of the eighth switching switch (820) serves as the antenna connection end of the second radio frequency module (80) to connect the second antenna device (90); the second end and the third end of the eighth switching switch (820) are respectively connected to the input end of the ninth amplifier (830) and the input end of the tenth amplifier (840); the first end of the eighth switching switch (820) is connected to its own second end or to its own third end.

8. The radio frequency front-end module according to claim 7, characterized in that: Also includes: A second conversion switch (91), a fourth duplexer (92), a third conversion switch (94) and a fifth duplexer (93); The first end of the first side and the second end of the first side of the second conversion switch (91) are respectively connected to the second radio frequency signal receiving end and the third radio frequency signal receiving end of the transceiver (10); the first end of the second side and the second end of the second side of the second conversion switch (91) are respectively connected to the first end and the second end of the fourth duplexer (92); the second conversion switch (91) is used to adjust the connection relationship between each port on the first side and each port on the second side of the second conversion switch under the control of the transceiver (10); The third end of the fourth duplexer (92) is connected to the first end of the third DC bias device (81) to transmit a radio frequency signal; a communication channel of the first frequency band of the fourth duplexer (92) is formed between the first end and the third end; and a communication channel of the second frequency band of the fourth duplexer (92) is formed between the second end and the third end; The first end of the first side and the second end of the first side of the third conversion switch (94) are respectively connected to the radio frequency signal transmission end of the second radio frequency module (80) and the power information output end of the first radio frequency module (60); the first end of the second side and the second end of the second side of the third conversion switch (94) are respectively connected to the first end and the second end of the fifth duplexer (93); the third conversion switch (94) is used to adjust the connection relationship between each port on the first side thereof and each port on the second side thereof under the control of the second radio frequency module (80); The third end of the fifth duplexer (93) is connected to the first end of the fourth DC bias device (83) to transmit a radio frequency signal and power information; the first end and the third end of the fifth duplexer (93) form a communication channel of the first frequency band of the fifth duplexer (93); the second end and the third end of the fifth duplexer (93) form a communication channel of the second frequency band of the fifth duplexer (93).

9. The radio frequency front-end module according to any one of claims 1 to 8, characterized in that: Also includes: A fifth DC bias device (95), a third coaxial cable (96), a sixth DC bias device (97), and a ninth switch (98); The first end of the fifth DC bias device (95) is connected to the fourth radio frequency signal receiving end of the transceiver (10), and the second end and the third end of the fifth DC bias device (95) are respectively connected to the fourth control end of the transceiver (10) and the first end of the third coaxial cable (96), so as to couple the radio frequency signal at the first end thereof with the third control signal at the second end thereof, and then transmit the coupled signals to the sixth DC bias device (97) through the third coaxial cable (96); The third end of the sixth DC bias device (97) is connected to the second end of the third coaxial cable (96), and is used for decoupling the signal received by its third end and transmitting the signal to the first end of the ninth switch (98) and the control end of the ninth switch (98) through its first end and second end respectively, so that the ninth switch (98) controls its first end to be connected to its designated port under the control of the third control signal; The second end to the Mth end of the ninth switch (98) are respectively used to receive M-1 power information from different radio frequency modules; M is a positive integer not less than 3.

10. A radio frequency system, characterized in that: include: A transceiver (10), a first channel switching circuit (20), a first DC bias device (30), a first coaxial cable (40), a second DC bias device (50), a first radio frequency module (60) and a first antenna device (70); The first channel switching circuit (20) is respectively connected to a first control end of the transceiver (10), N radio frequency signal transmission ends of the transceiver (10), and a first end of the first DC bias device (30); the first channel switching circuit (20) has communication channels of N frequency bands, and is used to adjust the connection relationship between the communication channels of each frequency band and the transceiver (10) under the control of the first control end, so that the communication channel of the corresponding frequency band is connected to the radio frequency signal transmission end currently designated for the communication channel; The second end and the third end of the first DC bias device (30) are respectively connected to the second control end of the transceiver (10) and the first end of the first coaxial cable (40), and are used to couple the radio frequency signal at the first end thereof with the first control signal at the second end thereof, and then send the coupled signals to the second DC bias device (50) through the first coaxial cable (40); The third end of the second DC bias device (50) is connected to the second end of the first coaxial cable (40), and is used to decouple the signal received by its third end and transmit it to the RF signal transmission end and the first control signal transmission end of the first RF module (60) through its first end and second end respectively, so that the first RF module (60) can transmit the RF signal to the first antenna device (70) under the control of the first control signal; wherein N is a positive integer not less than 2.

11. A communication device, characterized in that: Comprising the radio frequency system as claimed in claim 10.

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