Radio frequency circuit, radio frequency system and communication equipment

Abstract

The embodiment of the invention provides a radio frequency circuit, a radio frequency system and communication equipment. When the radio frequency circuit is arranged in a radio frequency system, the radio frequency circuit can be matched with a baseband chip which supports receiving baseband receiving signals of different frequency bands and outputs baseband transmitting signals of different frequency bands in the radio frequency system. The radio frequency circuit comprises a power amplification circuit, a low-noise amplification circuit and a first switch. The radio frequency circuit comprises a transmitting port, a receiving port and an antenna port. The first switch comprises a first end, a second end, a third end and a fourth end. The transmitting port of the radio frequency circuit is connected with the input end of the power amplification circuit, and the receiving port of the radio frequency circuit is connected with the output end of the low-noise amplification circuit. The output end of the power amplification circuit is connected with the first end of the first switch; the input end of the low-noise amplification circuit is connected with the second end of the first switch. And the third end and the fourth end of the first switch are respectively connected with an antenna port of the radio frequency circuit.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a radio frequency circuit, a radio frequency system, and a communication device. Background Art

[0002] In a wireless communication system, communication devices include station devices and access point devices. Station devices can communicate with access point devices, station devices can communicate with each other, and access point devices can communicate with each other. Specifically, station devices and access point devices are equipped with radio frequency systems, which are used to receive radio frequency signals or output radio frequency transmit signals to achieve communication.

[0003] The RF system includes a baseband chip and RF circuit. When the RF system receives an RF receive signal, the RF circuit receives the RF receive signal and outputs a baseband receive signal to the baseband chip based on the RF receive signal. The baseband chip then interprets the transmission data based on the baseband receive signal. When the RF system outputs an RF transmit signal, the baseband chip outputs a baseband transmit signal to the RF circuit based on the transmission data. The RF circuit then outputs an RF transmit signal based on the baseband transmit signal.

[0004] With the development of radio frequency systems, the baseband chips in most radio frequency systems can support receiving baseband receive signals in different frequency bands and output baseband transmit signals in different frequency bands. Therefore, it is also necessary to design new radio frequency circuits to adapt to the baseband chips. Summary of the Invention

[0005] The embodiments of the present application provide a radio frequency circuit, a radio frequency system, and a communication device. When the radio frequency circuit is provided in the radio frequency system, it can be adapted to a baseband chip in the radio frequency system that supports receiving baseband receive signals of different frequency bands and outputting baseband transmit signals of different frequency bands.

[0006] In a first aspect, a radio frequency circuit is provided. The radio frequency circuit includes: a power amplifier circuit, a low-noise amplifier circuit, and a first switch. The radio frequency circuit includes a transmit port, a receive port, and an antenna port. The first switch includes a first terminal, a second terminal, a third terminal, and a fourth terminal. The transmit port of the radio frequency circuit is connected to the input terminal of the power amplifier circuit, and the receive port of the radio frequency circuit is connected to the output terminal of the low-noise amplifier circuit. The output terminal of the power amplifier circuit is connected to the first terminal of the first switch; the input terminal of the low-noise amplifier circuit is connected to the second terminal of the first switch. The third terminal and the fourth terminal of the first switch are respectively connected to the antenna port of the radio frequency circuit. In this radio frequency circuit, due to the provision of the first switch, the first switch includes a third terminal and a fourth terminal, and the third terminal and the fourth terminal of the first switch are respectively connected to the antenna port of the radio frequency circuit, so that when the radio frequency circuit is disposed in a radio frequency system, it can be adapted to a baseband chip in the radio frequency system that supports receiving baseband receive signals of different frequency bands and outputting baseband transmit signals of different frequency bands.

[0007] Optionally, the antenna port includes a first antenna port and a second antenna port; the third terminal of the first switch is connected to the first antenna port of the radio frequency circuit; the fourth terminal of the first switch is connected to the second antenna port of the radio frequency circuit. In this optional manner, the radio frequency circuit can select to output a radio frequency transmit signal from the first antenna port or the second antenna port, or can also select to receive a radio frequency receive signal from the first antenna port or the second antenna port, enhancing the flexibility of the radio frequency circuit.

[0008] Optionally, the first switch is configured to conduct the first terminal and the third terminal; the power amplifier circuit is configured to receive a first baseband transmit signal input through the transmit port and output a first radio frequency transmit signal to the first antenna port according to the first baseband transmit signal. Alternatively, the first switch is configured to conduct the first terminal and the fourth terminal; the power amplifier circuit is configured to receive a second baseband transmit signal input through the transmit port and output a second radio frequency transmit signal to the second antenna port according to the second baseband transmit signal. Alternatively, the first switch is configured to conduct the second terminal and the third terminal; the low-noise amplifier circuit is configured to receive a first radio frequency receive signal input through the first antenna port and output a first baseband receive signal to the receive port according to the first radio frequency receive signal. Alternatively, the first switch is configured to conduct the second terminal and the fourth terminal; the low-noise amplifier circuit is configured to receive a second radio frequency receive signal input through the second antenna port and output a second baseband receive signal to the receive port according to the second radio frequency receive signal.

[0009] Optionally, the antenna port further includes at least one third antenna port; the first switch further includes at least one fifth terminal; one fifth terminal of the first switch is correspondingly connected to one third antenna port of the radio frequency circuit. In this optional manner, the radio frequency circuit can select to output the radio frequency transmission signal from the first antenna port or the second antenna port or any one of the third antenna ports, or can select to receive the radio frequency reception signal from the first antenna port or the second antenna port or any one of the third antenna ports, further enhancing the flexibility of the radio frequency circuit.

[0010] Optionally, the first switch is configured to conduct the first terminal and one fifth terminal; the power amplification circuit is configured to receive the third baseband transmission signal input through the transmission port and output the third radio frequency transmission signal to the corresponding third antenna port according to the third baseband transmission signal. Alternatively, the first switch is configured to conduct the second terminal and one fifth terminal; the low-noise amplification circuit is configured to receive the third radio frequency reception signal input through the corresponding third antenna port and output the third baseband reception signal to the reception port according to the third radio frequency reception signal.

[0011] Optionally, the radio frequency circuit further includes: a first filter; the third terminal of the first switch is connected to the first antenna port of the radio frequency circuit through the first filter. In this optional manner, a filter is also integrated in the radio frequency circuit, making the integration degree of the radio frequency circuit higher.

[0012] Optionally, the radio frequency circuit further includes: at least one second filter; the antenna port further includes at least one third antenna port; the first switch further includes at least one fifth terminal; one fifth terminal of the first switch is correspondingly connected to one third antenna port of the radio frequency circuit through one second filter.

[0013] Optionally, the radio frequency circuit further includes: a first filter and a second switch; the second switch includes a sixth terminal, a seventh terminal and an eighth terminal; the third terminal of the first switch is connected to the sixth terminal of the second switch through the first filter; the fourth terminal of the first switch is connected to the seventh terminal of the second switch; the eighth terminal of the second switch is connected to the antenna port of the radio frequency circuit. In this optional manner, the radio frequency circuit can include a first filter and a second switch, and includes one antenna port, making the integration degree of the radio frequency circuit higher. In addition, when the radio frequency circuit outputs the radio frequency transmission signal or receives the radio frequency reception signal, there are only two switches, the first switch and the second switch, on the signal transmission path, which can make the insertion loss of the radio frequency circuit smaller.

[0014] Optionally, the first switch is configured to conduct the first terminal and the third terminal; the second switch is configured to conduct the eighth terminal and the sixth terminal; the power amplification circuit is configured to receive the first baseband transmission signal input through the transmission port and output a first radio frequency transmission signal to the first filter according to the first baseband transmission signal; the first filter is configured to output the filtered first radio frequency transmission signal to the antenna port. Alternatively, the first switch is configured to conduct the first terminal and the fourth terminal; the second switch is configured to conduct the eighth terminal and the seventh terminal; the power amplification circuit is configured to receive the second baseband transmission signal input through the transmission port and output a second radio frequency transmission signal to the antenna port according to the second baseband transmission signal. Alternatively, the first switch is configured to conduct the second terminal and the third terminal; the second switch is configured to conduct the eighth terminal and the sixth terminal; the first filter is configured to receive the first radio frequency reception signal input through the antenna port and output the filtered first radio frequency reception signal to the low noise amplification circuit; the low noise amplification circuit is configured to output a first baseband reception signal to the reception port according to the first radio frequency reception signal. Alternatively, the first switch is configured to conduct the second terminal and the fourth terminal; the second switch is configured to conduct the eighth terminal and the seventh terminal; the low noise amplification circuit is configured to receive the second radio frequency reception signal input through the antenna port and output a second baseband reception signal to the reception port according to the second radio frequency reception signal.

[0015] Optionally, the radio frequency circuit further includes: at least one second filter; the first switch further includes at least one fifth terminal; the second switch further includes at least one ninth terminal; one fifth terminal of the first switch is correspondingly connected to one ninth terminal of the second switch through one second filter.

[0016] Optionally, the first switch is configured to conduct the first terminal and a fifth terminal; the second switch is configured to conduct the eighth terminal and the corresponding ninth terminal; the power amplification circuit is configured to receive the third baseband transmission signal input through the transmission port and output a third radio frequency transmission signal to the corresponding second filter according to the third baseband transmission signal; the corresponding second filter is configured to output the filtered third radio frequency transmission signal to the antenna port. Alternatively, the first switch is configured to conduct the second terminal and a fifth terminal; the second switch is configured to conduct the eighth terminal and the corresponding ninth terminal; the corresponding second filter is configured to receive the third radio frequency reception signal input through the antenna port and output the filtered third radio frequency reception signal to the low noise amplification circuit; the low noise amplification circuit is configured to output a third baseband reception signal to the reception port according to the third radio frequency reception signal.

[0017] Optionally, the low-noise amplification circuit includes a low-noise amplifier, an attenuator, and a third switch; the attenuator and the third switch are connected in series between the input end and the output end of the low-noise amplification circuit; the low-noise amplifier is connected between the input end and the output end of the low-noise amplification circuit.

[0018] In a second aspect, a radio frequency system is provided. The radio frequency system includes: a baseband chip and at least one radio frequency circuit as described in any one of the above first aspects; the radio frequency system further includes a common antenna port; the baseband chip is connected to the transmission port and the reception port of the radio frequency circuit; the common antenna port of the radio frequency system is connected to the antenna port of the radio frequency circuit.

[0019] Optionally, the common antenna port of the radio frequency system includes a first common antenna port and a second common antenna port; the antenna port of the radio frequency circuit includes a first antenna port and a second antenna port; the first antenna port is connected to the first common antenna port, and the second antenna port is connected to the second common antenna port.

[0020] Optionally, the radio frequency system further includes a third filter; the first antenna port is connected to the first common antenna port through the third filter.

[0021] Optionally, the radio frequency system further includes a third filter and a fourth switch; the fourth switch includes a tenth terminal, an eleventh terminal, and a twelfth terminal; the antenna port of the radio frequency circuit includes a first antenna port and a second antenna port; the first antenna port is connected to the tenth terminal of the fourth switch through the third filter, and the second antenna port is connected to the eleventh terminal of the fourth switch; the twelfth terminal of the fourth switch is connected to the common antenna port of the radio frequency system.

[0022] Optionally, the radio frequency system further includes a fourth switch; the fourth switch includes a tenth terminal, an eleventh terminal, and a twelfth terminal; the radio frequency circuit includes a first filter, and the antenna port of the radio frequency circuit includes a first antenna port and a second antenna port; the first antenna port is connected to the tenth terminal of the fourth switch; the second antenna port is connected to the eleventh terminal of the fourth switch; the twelfth terminal of the fourth switch is connected to the common antenna port of the radio frequency system.

[0023] In a third aspect, a communication device is provided. The communication device includes an antenna and a radio frequency system as described in any one of the above second aspects; the antenna is connected to the common antenna port of the radio frequency system.

[0024] Wherein, for the technical effects brought by any possible implementation manner in the second aspect to the third aspect, reference may be made to the technical effects brought by different implementation manners in the above first aspect, which will not be elaborated herein. Description of the Drawings

[0025] Figure 1Structural schematic diagram of the communication system provided by the embodiment of the present application;

[0026] Figure 2 Structural schematic diagram of the radio frequency system provided by the embodiment of the present application;

[0027] Figure 3 Structural schematic diagram of the radio frequency circuit provided by the embodiment of the present application;

[0028] Figure 4 Structural schematic diagram of the radio frequency system provided by another embodiment of the present application;

[0029] Figure 5 Structural schematic diagram of the radio frequency circuit provided by another embodiment of the present application;

[0030] Figure 6 Structural schematic diagram of the radio frequency circuit provided by yet another embodiment of the present application;

[0031] Figure 7 Structural schematic diagram of the radio frequency circuit provided by another embodiment of the present application;

[0032] Figure 8 Structural schematic diagram of the radio frequency circuit provided by another embodiment of the present application;

[0033] Figure 9 Structural schematic diagram of the radio frequency circuit provided by yet another embodiment of the present application;

[0034] Figure 10 Structural schematic diagram of the radio frequency circuit provided by another embodiment of the present application;

[0035] Figure 11 Structural schematic diagram of the radio frequency circuit provided by another embodiment of the present application;

[0036] Figure 12 Structural schematic of the first switch in the radio frequency circuit provided by the embodiment of the present application Figure 1 ;

[0037] Figure 13 Structural schematic of the first switch in the radio frequency circuit provided by the embodiment of the present application Figure 2 ;

[0038] Figure 14 Structural schematic diagram of the radio frequency system provided by another embodiment of the present application;

[0039] Figure 15 Structural schematic diagram of the communication device provided by the embodiment of the present application;

[0040] Figure 16 Structural schematic diagram of the radio frequency system provided by yet another embodiment of the present application;

[0041] Figure 17 Schematic structural diagram of a radio frequency system provided for another embodiment of the present application;

[0042] Figure 18 Schematic structural diagram of a radio frequency system provided for another embodiment of the present application;

[0043] Figure 19 Schematic structural diagram of a radio frequency system provided for yet another embodiment of the present application;

[0044] Figure 20 Schematic structural diagram of a radio frequency system provided for another embodiment of the present application;

[0045] Figure 21 Schematic structural diagram of a radio frequency system provided for another embodiment of the present application;

[0046] Figure 22 Schematic structural diagram of a radio frequency system provided for yet another embodiment of the present application;

[0047] Figure 23 Schematic structural diagram of a radio frequency system provided for another embodiment of the present application;

[0048] Figure 24 Schematic structural diagram of a radio frequency system provided for another embodiment of the present application. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0050] Unless otherwise defined, all scientific and technical terms used herein have the same meaning as commonly understood by those of ordinary skill in the art. In the embodiments of the present application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, or B exists alone, where A and B may be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item (item) or plural items (items). For example, at least one (item) of a, b or c may represent: a, b, c, a and b, a and c, b and c, or a, b and c, where a, b and c may be single or multiple. Additionally, in the embodiments of the present application, terms such as "first", "second", etc. do not limit the quantity and order.

[0051] In addition, in the embodiments of the present application, orientation terms such as "upper" and "lower" are defined relative to the orientation of the components shown in the drawings. It should be understood that these directional terms are relative concepts, which are used for relative description and clarification, and they can change accordingly according to the change of the orientation of the components placed in the drawings.

[0052] In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be construed as more preferred or more advantageous than other embodiments or design solutions. Exactly speaking, using words such as "exemplary" or "for example" aims to present relevant concepts in a specific way.

[0053] Next, the technical solutions in the embodiments of the present application will be described in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments.

[0054] Next, the implementation manners of the embodiments of the present application will be described in detail with reference to the drawings of the specification.

[0055] Refer to Figure 1 as shown Figure 1 which is a schematic structural diagram of a communication system provided by an embodiment of the present application. The communication system includes communication devices, and the communication devices can be, for example Figure 1 the access point devices (station) STA1, access point device STA2, station devices (access point) AP1 and station device AP2 as shown. Among them, the access point device STA1 can communicate with one or more of the access point device STA2, station device AP1 and station device AP2. The access point device STA2 can communicate with one or more of the access point device STA1, station device AP1 and station device AP2. The station device AP1 can communicate with one or more of the access point device STA1, access point device STA2 and station device AP2. The station device AP2 can communicate with one or more of the access point device STA1, access point device STA2 and station device AP1.

[0056] Exemplarily, Figure 1The communication between communication devices in the shown communication system complies with the requirements of a wireless local area network (WLAN) that conforms to relevant standards of the Institute of Electrical and Electronics Engineers (IEEE). The IEEE relevant standards include, without limitation: 802.11a / b / g standards, 802.11n standards, 802.11ac standards, 802.11ax standards, 802.11be standards, 802.11bn standards / UHR standards / WiFi8 standards, 802.11ad standards, 802.11ay standards, 802.11bf standards / sensing standards, UWB standards / 802.15 standards, etc.

[0057] Exemplarily, the station device AP1 and / or the station device AP2 can be devices that support multiple WLAN systems such as the 802.11be standard or future Wi-Fi standards; they can also be devices that support the 802.11a / b / g standards, 802.11n standards, 802.11ac standards, 802.11ax standards, 802.11be standards, 802.11bn standards / UHR standards / WiFi8 standards, without limitation.

[0058] For example, the station device AP1 and / or the station device AP2 can be terminal devices, network devices, communication servers, routers, switches, bridges, computers, etc. with Wi-Fi chips. The station device AP1 and / or the station device AP2 can also be access points for mobile users to enter the wired network, mainly deployed inside homes, buildings, and campuses, with a typical coverage radius of dozens of meters to hundreds of meters. Of course, they can also be deployed outdoors. The station device AP1 and / or the station device AP2 is equivalent to a bridge connecting the wired network and the wireless network, and its main function is to connect each wireless network client together and then connect the wireless network to the Ethernet.

[0059] Exemplarily, the access point device STA1 and / or the access point device STA2 can be devices that support multiple WLAN systems such as the 802.11be standard or future Wi-Fi standards; they can also be devices that support the 802.11a / b / g standards, 802.11n standards, 802.11ac standards, 802.11ax standards, 802.11be standards, 802.11bn standards / UHR standards / WiFi8 standards, without limitation.

[0060] For example, the access point device STA1 and / or the access point device STA2 can be a wireless communication chip, a wireless sensor, a wireless communication terminal, a communication server, a router, a switch, a bridge, a computer, etc. For example, the access point device STA1 and / or the access point device STA2 can be a mobile phone supporting Wi-Fi communication function, a tablet computer supporting Wi-Fi communication function, a set-top box supporting Wi-Fi communication function, a smart TV supporting Wi-Fi communication function, a smart wearable device supporting Wi-Fi communication function, a vehicle-mounted communication device supporting Wi-Fi communication function, and a computer supporting Wi-Fi communication function, etc., without limitation.

[0061] Specifically, a radio frequency system is provided in the above communication device, and the radio frequency system is used to receive a radio frequency reception signal or output a radio frequency transmission signal to implement communication between this communication device and other communication devices.

[0062] Refer to Figure 2 As shown, an embodiment of the present application provides a schematic structural diagram of a radio frequency system 10. The radio frequency system 10 includes a baseband chip 11 and a radio frequency circuit 12. The baseband chip 11 is connected to the transmission port and the reception port of the radio frequency circuit 12. Exemplarily, when the radio frequency system 10 receives a radio frequency reception signal, the radio frequency circuit 12 receives the radio frequency reception signal and outputs a baseband reception signal to the baseband chip 11 according to the radio frequency reception signal; the baseband chip 11 receives the baseband reception signal and analyzes the transmission data according to the baseband reception signal. When the radio frequency system 10 outputs a radio frequency transmission signal, the baseband chip 11 outputs a baseband transmission signal to the radio frequency circuit 12 according to the transmission data; the radio frequency circuit 12 outputs a radio frequency transmission signal according to the baseband transmission signal.

[0063] Exemplarily, refer to Figure 3 As shown, among them, the radio frequency circuit 12 includes a power amplifier circuit 121, a switch 122, and a low-noise amplifier circuit 123. Among them, the radio frequency circuit 12 includes a transmission port, a reception port, and an antenna port. Specifically, the transmission port of the radio frequency circuit 12 is connected to the input end of the power amplifier circuit 121, the output end of the power amplifier circuit 121 is connected to the b end of the switch 122, the a end of the switch 122 is connected to the antenna port of the radio frequency circuit 12, the c end of the switch 122 is connected to the input end of the low-noise amplifier circuit 123, and the output end of the low-noise amplifier circuit 123 is connected to the reception port of the radio frequency circuit 12.

[0064] Specifically, when the radio frequency circuit 12 receives a radio frequency reception signal, specifically, the radio frequency reception signal is input from the antenna port of the radio frequency circuit 12. The switch 122 is configured to conduct the a-end of the switch 122 with the c-end of the switch 122, thereby transmitting the radio frequency reception signal to the low-noise amplifier circuit 123. The low-noise amplifier circuit 123 is configured to output a baseband reception signal to the reception port of the radio frequency circuit 12 according to the radio frequency reception signal. When the radio frequency circuit 12 outputs a radio frequency transmission signal, the switch 122 is configured to conduct the a-end of the switch 122 with the b-end of the switch 122. The power amplifier circuit 121 is configured to receive the baseband transmission signal input through the transmission port of the radio frequency circuit 12 and output a radio frequency transmission signal to the antenna port of the radio frequency circuit according to the baseband transmission signal.

[0065] Exemplarily, with the development of the baseband chip 11 and the wireless local area network, currently, the vast majority of baseband chips 11 can support receiving baseband reception signals of different frequency bands and outputting baseband transmission signals of different frequency bands. Then, when the baseband chip 11 is disposed in the radio frequency system 10, multiple radio frequency circuits 12 need to be disposed in the radio frequency system 10 and connected to the baseband chip 11. Refer to Figure 4 As shown, among them, multiple radio frequency circuits 12 (such as Figure 4 the radio frequency circuit 12-1 and the radio frequency circuit 12-2 shown) are disposed in the radio frequency system 10. One radio frequency circuit 12 is used to receive a baseband reception signal of one frequency band and output a baseband transmission signal of that frequency band. In this scenario, in order to ensure that there is no interference between signals of different frequency bands, Figure 4 filters 13 (such as Figure 4 the filter 13-1 and the filter 13-2 shown) are also disposed in the radio frequency system 10 shown. One radio frequency circuit 12 is connected to one filter 13.

[0066] Specifically, refer to Figure 4 As shown, the baseband chip 11 supports receiving a baseband reception signal of the first frequency band and outputting a baseband transmission signal of the first frequency band, and / or the baseband chip 11 supports receiving a baseband reception signal of the second frequency band and outputting a baseband transmission signal of the second frequency band. Figure 4The radio frequency system 10 further includes switches 14-1, 14-2, 14-3, and 14-4. The radio frequency system 10 further includes a first common antenna port and a second common antenna port. The wavelength range of the filter 13-1 is the first frequency band, and the wavelength range of the filter 13-2 is the second frequency band. Among them, the baseband chip 11 is connected to the transmitting and receiving ports of the radio frequency circuit 12-1. The antenna port of the radio frequency circuit 12-1 is connected to the a end of the switch 14-1. The b end of the switch 14-1 is connected to the b end of the switch 14-2. The c end of the switch 14-1 is connected to the c end of the switch 14-2 through the filter 13-1. The a end of the switch 14-2 is connected to the first common antenna port of the radio frequency system 10. The baseband chip 11 is connected to the transmitting and receiving ports of the radio frequency circuit 12-2. The antenna port of the radio frequency circuit 12-2 is connected to the a end of the switch 14-3. The b end of the switch 14-3 is connected to the b end of the switch 14-4. The c end of the switch 14-3 is connected to the c end of the switch 14-4 through the filter 13-2. The a end of the switch 14-4 is connected to the second common antenna port of the radio frequency system 10.

[0067] Figure 4 The radio frequency system 10 shown includes the following three operating modes:

[0068] Figure 4 Operating mode 1 of the radio frequency system 10 shown: The baseband chip 11 is configured to receive a radio frequency reception signal in the first frequency band and output a radio frequency transmission signal in the first frequency band. The switch 14-1 is configured to conduct the a end of the switch 14-1 to the b end of the switch 14-1. The switch 14-2 is configured to conduct the b end of the switch 14-2 to the a end of the switch 14-2. The switch 14-3 is configured to conduct the a end of the switch 14-3 to the b end of the switch 14-3. The switch 14-4 is configured to conduct the b end of the switch 14-4 to the a end of the switch 14-4.

[0069] When the radio frequency (RF) system 10 receives an RF reception signal in the first frequency band, the first RF reception signal in the first frequency band is input through the first common antenna port of the RF system 10 and transmitted to the RF circuit 12-1 through switches 14-2 and 14-1. The RF circuit 12-1 is configured to output a first baseband reception signal in the first frequency band to the reception port of the RF circuit 12-1 according to the first RF reception signal in the first frequency band. The baseband chip 11 is configured to receive the first baseband reception signal in the first frequency band and parse the first transmission data according to the first baseband reception signal in the first frequency band. The second RF reception signal in the first frequency band is input through the second common antenna port of the RF system 10 and transmitted to the RF circuit 12-2 through switches 14-4 and 14-3. The RF circuit 12-2 is configured to output a second baseband reception signal in the first frequency band to the reception port of the RF circuit 12-2 according to the second RF reception signal in the first frequency band. The baseband chip 11 is configured to receive the second baseband reception signal in the first frequency band and parse the second transmission data according to the second baseband reception signal in the first frequency band.

[0070] When the RF system 10 outputs an RF transmission signal in the first frequency band, the baseband chip 11 can generate a first baseband transmission signal in the first frequency band and a second baseband transmission signal in the first frequency band. The RF circuit 12-1 receives the first baseband transmission signal in the first frequency band through the transmission port, outputs a first RF transmission signal in the first frequency band to the antenna port of the RF circuit 12-1 according to the first baseband transmission signal in the first frequency band, and the first RF transmission signal in the first frequency band is output from the first common antenna port of the RF system 10 through switches 14-1 and 14-2. The RF circuit 12-2 receives the second baseband transmission signal in the first frequency band through the transmission port, outputs a second RF transmission signal in the first frequency band to the antenna port of the RF circuit 12-1 according to the second baseband transmission signal in the first frequency band, and the second RF transmission signal in the first frequency band is output from the second common antenna port of the RF system 10 through switches 14-3 and 14-4.

[0071] Figure 4 The working mode 2 of the shown RF system 10: The baseband chip 11 is configured to receive a baseband reception signal in the second frequency band and output a baseband transmission signal in the second frequency band. The configurations of switches 14-1, 14-2, 14-3, and 14-4 are the same as those in the above Example 1 and will not be elaborated here.

[0072] Figure 4Operating mode 3 of the radio frequency system 10 shown: The baseband chip 11 is configured to receive baseband reception signals of a first frequency band, output baseband transmission signals of the first frequency band, and receive baseband reception signals of a second frequency band and output baseband transmission signals of the second frequency band. The switch 14-1 is configured to conduct the a end of the switch 14-1 to the c end of the switch 14-1, and the switch 14-2 is configured to conduct the c end of the switch 14-2 to the a end of the switch 14-2; the switch 14-3 is configured to conduct the a end of the switch 14-3 to the c end of the switch 14-3, and the switch 14-4 is configured to conduct the c end of the switch 14-4 to the a end of the switch 14-4.

[0073] When the radio frequency system 10 receives a radio frequency reception signal of the first frequency band, the radio frequency reception signal of the first frequency band is input through the first common antenna port of the radio frequency system 10 and transmitted to the filter 13-1 through the switch 14-2; the filter 13-1 transmits the filtered radio frequency reception signal of the first frequency band to the radio frequency circuit 12-1 through the switch 14-1; the radio frequency circuit 12-1 is configured to output a baseband reception signal of the first frequency band to the reception port of the radio frequency circuit 12-1 according to the radio frequency reception signal of the first frequency band; the baseband chip 11 is configured to receive the baseband reception signal of the first frequency band and analyze the transmission data according to the baseband reception signal of the first frequency band. When the radio frequency system 10 outputs a radio frequency transmission signal of the first frequency band, the baseband chip 11 can generate a baseband transmission signal of the first frequency band. The radio frequency circuit 12-1 receives the baseband transmission signal of the first frequency band through the transmission port, outputs a radio frequency transmission signal of the first frequency band to the antenna port of the radio frequency circuit 12-1 according to the baseband transmission signal of the first frequency band, and the radio frequency transmission signal of the first frequency band is transmitted to the filter 13-1 through the switch 14-1; the filter 13-1 transmits the filtered radio frequency transmission signal of the first frequency band through the switch 14-2 and then outputs it from the first common antenna port of the radio frequency system 10.

[0074] When the radio frequency (RF) system 10 receives an RF reception signal in a second frequency band, the RF reception signal in the second frequency band is input through the second common antenna port of the RF system 10 and transmitted to the filter 13-2 through the switch 14-4; the filter 13-2 transmits the filtered RF reception signal in the second frequency band to the RF circuit 12-2 through the switch 14-3; the RF circuit 12-2 is configured to output a baseband reception signal in the second frequency band to the reception port of the RF circuit 12-2 according to the RF reception signal in the second frequency band; the baseband chip 11 is configured to receive the baseband reception signal in the second frequency band and parse the transmission data according to the baseband reception signal in the second frequency band. When the RF system 10 outputs an RF transmission signal in the second frequency band, the baseband chip 11 can generate a baseband transmission signal in the second frequency band. The RF circuit 12-2 receives the baseband transmission signal in the second frequency band through the transmission port, outputs an RF transmission signal in the second frequency band to the antenna port of the RF circuit 12-2 according to the baseband transmission signal in the second frequency band, and the RF transmission signal in the second frequency band is transmitted to the filter 13-2 through the switch 14-3; the filter 13-2 transmits the filtered RF reception signal through the switch 14-4 and then outputs it from the second common antenna port of the RF system 10.

[0075] When Figure 3 the RF circuit 12 shown in Figure 4 the RF system shown, the transmission of any one of the RF transmission signal in the first frequency band, the RF transmission signal in the second frequency band, the RF reception signal in the first frequency band, and the RF reception signal in the second frequency band needs to pass through 3 switches, and the 3 switches are in a series connection relationship. The insertion loss of the RF system 10 is the sum of the insertion losses of the three switches, making Figure 4 the insertion loss of the RF system 10 shown relatively large.

[0076] Therefore, an embodiment of the present application provides an RF circuit, which can be well adapted to Figure 4 the baseband chip in the RF system 10 shown.

[0077] Specifically, referring to Figures 5 to 11 shown, an embodiment of the present application provides a schematic structural diagram of an RF circuit 20, which includes: a power amplifier circuit 21, a low-noise amplifier circuit 23, and a switch 22 (also referred to as the first switch); wherein, the RF circuit 20 includes a transmission port, a reception port, and an antenna port; the switch 22 includes an h terminal (also referred to as the first terminal of the switch 22), an i terminal (also referred to as the second terminal of the switch 22), a j terminal (also referred to as the third terminal of the switch 22), and a k terminal (also referred to as the fourth terminal of the switch 22).

[0078] Among them, the transmitting port of the radio frequency circuit 20 is connected to the input end of the power amplifier circuit 21; the receiving port of the radio frequency circuit 20 is connected to the output end of the low-noise amplifier circuit 23; the output end of the power amplifier circuit 21 is connected to the h end of the switch 22; the input end of the low-noise amplifier circuit 23 is connected to the i end of the switch 22; the j end and the k end of the switch 22 are respectively connected to the antenna ports of the radio frequency circuit 20.

[0079] In this radio frequency circuit 20, due to the provision of the switch 22, the switch 22 includes an h end and a k end, and the h end and the k end of the switch 22 are respectively connected to the antenna ports of the radio frequency circuit. Thus, when the radio frequency circuit 20 is arranged in a radio frequency system, it can be adapted to a baseband chip in the radio frequency system that supports receiving baseband reception signals of different frequency bands and outputting baseband transmission signals of different frequency bands.

[0080] Specifically, referring to Figure 5 As shown, among them, the antenna ports include antenna port 1 (also referred to as the first antenna port) and antenna port 2 (also referred to as the second antenna port), the j end of the switch 22 is connected to antenna port 1 of the radio frequency circuit 20; the k end of the switch 22 is connected to antenna port 2 of the radio frequency circuit 20.

[0081] Among them, Figure 5 The radio frequency circuit 20 shown includes the following working states:

[0082] Working state 1: The switch 22 is configured to conduct the h end and the j end; the power amplifier circuit 21 is configured to receive a first baseband transmission signal input through the transmitting port and output a first radio frequency transmission signal to antenna port 1 according to the first baseband transmission signal.

[0083] Working state 2: The switch 22 is configured to conduct the h end and the k end; the power amplifier circuit 21 is configured to receive a second baseband transmission signal input through the transmitting port and output a second radio frequency transmission signal to antenna port 2 according to the second baseband transmission signal.

[0084] Working state 3: The switch 22 is configured to conduct the i end and the j end; the low-noise amplifier circuit 23 is configured to receive a first radio frequency reception signal input through antenna port 1 and output a first baseband reception signal to the receiving port according to the first radio frequency reception signal.

[0085] Working state 4: The switch 22 is configured to conduct the i end and the k end; the low-noise amplifier circuit 23 is configured to receive a second radio frequency reception signal input through antenna port 2 and output a second baseband reception signal to the receiving port according to the second radio frequency reception signal.

[0086] Among them, within a period of time, the radio frequency circuit 20 will execute one of working state 1 or working state 2 or working state 3 or working state 4.

[0087] Exemplarily, referring to Figure 5 as shown, wherein, the low-noise amplification circuit 23 includes a low-noise amplifier 231, an attenuator 232, and a switch S1 (also referred to as the third switch); the attenuator 232 and the switch S1 are connected in series between the input end and the output end of the low-noise amplification circuit 23; the low-noise amplifier 231 is connected between the input end and the output end of the low-noise amplification circuit 23.

[0088] Then Figure 5 the working states 3 of the radio frequency circuit 20 shown include:

[0089] Working state 31: The switch 22 is configured to conduct the i terminal and the j terminal; the switch S1 is configured not to close; the low-noise amplification circuit 23 is configured to receive the first radio frequency reception signal input through the antenna port 1, and the low-noise amplifier 231 amplifies the first radio frequency reception signal to generate a first baseband reception signal.

[0090] Working state 32: The switch 22 is configured to conduct the i terminal and the j terminal; the switch S1 is configured to close; the low-noise amplification circuit 23 is configured to receive the first radio frequency reception signal input through the antenna port 1, and the attenuator 232 attenuates the first radio frequency reception signal to generate a first baseband reception signal.

[0091] Then Figure 5 the working states 4 of the radio frequency circuit 20 shown include:

[0092] Working state 41: The switch 22 is configured to conduct the i terminal and the k terminal; the switch S1 is configured not to close; the low-noise amplification circuit 23 is configured to receive the second radio frequency reception signal input through the antenna port 2, and the low-noise amplifier 231 amplifies the second radio frequency reception signal to generate a second baseband reception signal.

[0093] Working state 42: The switch 22 is configured to conduct the i terminal and the k terminal; the switch S1 is configured to close; the low-noise amplification circuit 23 is configured to receive the second radio frequency reception signal input through the antenna port 2, and the attenuator 232 attenuates the second radio frequency reception signal to generate a second baseband reception signal.

[0094] Exemplarily, when Figure 5 the switch S1 shown is configured to close, the baseband chip 31 does not supply a power supply voltage to the low-noise amplifier 231. The low-noise amplifier 231 is equivalent to a larger attenuator, and the attenuation amount of the low-noise amplifier 231 is much larger than that of the attenuator 232. Therefore, it can also be considered that the signal between the input end and the output end of the low-noise amplification circuit 23 is transmitted through the attenuator 232.

[0095] In some other embodiments, the switch S1 may also be a single-pole double-throw switch, and the switch S1 is used to select and connect the input end and the output end of the low-noise amplifier circuit 23 through the attenuator 232 or the low-noise amplifier 231.

[0096] Exemplarily, referring to Figure 6 as shown, in Figure 5 the radio frequency circuit 20 as shown, Figure 6 the antenna port of the radio frequency circuit 20 as shown further includes an antenna port 31 (also referred to as the third antenna terminal); the switch 22 further includes a q1 terminal (also referred to as the fifth terminal of the switch 22); the q1 terminal of the switch 22 is correspondingly connected to the antenna port 31 of the radio frequency circuit 20.

[0097] Then Figure 6 the working states of the radio frequency circuit 20 as shown not only include Figure 5 the working states of the radio frequency circuit 20 as shown, but also include the following working states:

[0098] Working state 5: The switch 22 is configured to conduct the h terminal and the q1 terminal; the power amplifier circuit 21 is configured to receive the third baseband transmission signal input through the transmission port, and amplify and output the third radio frequency transmission signal to the antenna port 31 according to the third baseband transmission signal.

[0099] Working state 6: The switch 22 is configured to conduct the i terminal and the q1 terminal; the low-noise amplifier circuit 23 is configured to receive the third radio frequency reception signal input through the antenna port 31, and output the third baseband reception signal to the reception port according to the third radio frequency reception signal.

[0100] Among them, Figure 6 the structure of the low-noise amplifier circuit 23 as shown is the same as Figure 5 the structure of the low-noise amplifier circuit 23 as shown, so the above working state 6 includes:

[0101] Working state 61: The switch 22 is configured to conduct the i terminal and the q1 terminal; the switch S1 is configured not to close; the low-noise amplifier circuit 23 is configured to receive the third radio frequency reception signal input through the antenna port 31, and the low-noise amplifier 231 amplifies the third radio frequency reception signal to generate the third baseband reception signal.

[0102] Working state 62: The switch 22 is configured to conduct the i terminal and the q1 terminal; the switch S1 is configured to close; the low-noise amplifier circuit 23 is configured to receive the third radio frequency reception signal input through the antenna port 31, and the attenuator 232 attenuates the third radio frequency reception signal to generate the third baseband reception signal.

[0103] Exemplarily, referring to Figure 7 as shown, inFigure 6 Based on the radio frequency circuit 20 shown, Figure 7 The antenna port of the radio frequency circuit 20 shown further includes an antenna port 32 (also referred to as the third antenna terminal); the switch 22 further includes a q2 terminal (also referred to as the fifth terminal of the switch 22); the q2 terminal of the switch 22 is correspondingly connected to the antenna port 32 of the radio frequency circuit 20.

[0104] Then Figure 7 The operating states of the radio frequency circuit 20 shown not only include Figure 6 The operating states of the radio frequency circuit 20 shown, but also include the following operating states:

[0105] Operating state 7: The switch 22 is configured to conduct the h terminal and the q2 terminal; the power amplifier circuit 21 is configured to receive the third baseband transmission signal input through the transmission port, and amplify and output the third radio frequency transmission signal to the antenna port 32 according to the third baseband transmission signal.

[0106] Operating state 8: The switch 22 is configured to conduct the i terminal and the q3 terminal; the low noise amplifier circuit 23 is configured to receive the third radio frequency reception signal input through the antenna port 32, and output the third baseband reception signal to the reception port according to the third radio frequency reception signal.

[0107] Among them, Figure 7 The structure of the low noise amplifier circuit 23 shown is the same as Figure 6 The structure of the low noise amplifier circuit 23 shown, so the above operating state 8 includes:

[0108] Operating state 81: The switch 22 is configured to conduct the i terminal and the q2 terminal; the switch S1 is configured not to close; the low noise amplifier circuit 23 is configured to receive the third radio frequency reception signal input through the antenna port 32, and the low noise amplifier 231 amplifies the third radio frequency reception signal to generate the third baseband reception signal.

[0109] Operating state 82: The switch 22 is configured to conduct the i terminal and the q2 terminal; the switch S1 is configured to close; the low noise amplifier circuit 23 is configured to receive the third radio frequency reception signal input through the antenna port 32, and the attenuator 232 attenuates the third radio frequency reception signal to generate the third baseband reception signal.

[0110] Exemplarily, in Figure 7 The radio frequency circuit 20 shown, the antenna port of the radio frequency circuit 20 may further include multiple third antenna terminals; the switch 22 may further include multiple fifth terminals, and the embodiments of the present application do not limit this.

[0111] That is, the antenna port of the radio frequency circuit 20 further includes at least one third antenna port; the switch 22 further includes at least one fifth terminal; one fifth terminal of the switch 22 is correspondingly connected to one third antenna port of the radio frequency circuit 20. For example, the q1 terminal of the switch 22 is correspondingly connected to the antenna port 31 of the radio frequency circuit 20, and the q2 terminal of the switch 22 is correspondingly connected to the antenna port 32 of the radio frequency circuit 20.

[0112] The switch 22 is configured to conduct the h terminal to a fifth terminal; the power amplification circuit 21 is configured to receive the third baseband transmission signal input through the transmission port, and amplify and output the third radio frequency transmission signal to the corresponding third antenna port according to the third baseband transmission signal. Exemplarily, when the h terminal is conducted to the q1 terminal, the corresponding third antenna port is specifically the antenna port 31 connected to the q1 terminal. When the h terminal is conducted to the q2 terminal, the corresponding third antenna port is specifically the antenna port 32 connected to the q2 terminal.

[0113] Alternatively, the switch 22 is configured to conduct the i terminal to a fifth terminal; the low noise amplification circuit is configured to receive the third radio frequency reception signal input through the corresponding third antenna port, and output the third baseband reception signal to the reception port based on the third radio frequency reception signal. Exemplarily, when the i terminal is conducted to the q1 terminal, the corresponding third antenna port is specifically the antenna port 31 connected to the q1 terminal. When the i terminal is conducted to the q2 terminal, the corresponding third antenna port is specifically the antenna port 32 connected to the q2 terminal.

[0114] In another embodiment, refer to Figure 8 as shown, compared with Figure 5 the radio frequency circuit 20 shown, Figure 8 the radio frequency circuit 20 shown further includes: a filter 24 (also referred to as the first filter); the j terminal of the switch 22 is connected to the antenna port 1 of the radio frequency circuit 20 through the filter 24.

[0115] Among them, Figure 7 the working state of the radio frequency circuit 20 shown can refer to Figure 5The operating state of the radio frequency circuit 20 shown. The difference is that in operating state 1, the power amplifier circuit 21 is configured to receive a first baseband transmission signal input through the transmission port, output a first radio frequency transmission signal to the filter 24 according to the first baseband transmission signal, and the filter 24 outputs the filtered first radio frequency transmission signal to the antenna port 1. Among them, the filter 24 can specifically filter out the sideband interference signals of the first radio frequency transmission signal, etc. In operating state 3, the filter 24 is configured to receive a first radio frequency reception signal input through the antenna port 1 and output the filtered first radio frequency reception signal to the low-noise amplifier circuit 23. Among them, the filter 24 can specifically filter out other signals with different frequency bands from the first radio frequency reception signal, etc.; the low-noise amplifier circuit 23 is configured to output a first baseband reception signal to the reception port according to the first radio frequency reception signal.

[0116] In addition, based on the radio frequency circuit 20 shown Figure 8 as shown, referring to Figure 9 as shown, where the radio frequency circuit 20 further includes: at least one second filter (such as Figure 9 the filter 251 and the filter 252 shown); the antenna port further includes at least one third antenna port (such as Figure 8 the antenna port 31 and the antenna port 32 shown); the switch 22 further includes at least one fifth terminal (such as Figure 8 the q1 terminal and the q2 terminal shown); among them, one fifth terminal of the switch 22 is correspondingly connected to a third antenna port of the radio frequency circuit 20 through a second filter. Exemplarily, the q1 terminal of the switch 22 is connected to the antenna port 31 of the radio frequency circuit 20 through the filter 251, and the q2 terminal of the switch 22 is connected to the antenna port 32 of the radio frequency circuit 20 through the filter 252.

[0117] Among them, the embodiments of the present application do not limit Figure 9 the frequency range of the filter 24 shown, the frequency range of the filter 251, and the frequency range of the filter 252. In some cases, the frequency range of the filter 24, the frequency range of the filter 251, and the frequency range of the filter 252 can respectively conform to the frequency range of the 5G high-frequency band divided according to the WIFI frequency bands of different countries.

[0118] Exemplarily, the frequency range of the filter 24 is the first frequency band, indicating that the filter 24 will filter out all other signals outside the first frequency band and output the signal of the first frequency band.

[0119] A switch 22, configured to conduct the h terminal to a fifth terminal; a power amplifier circuit 21, configured to receive a third baseband transmission signal input through a transmission port, amplify the third baseband transmission signal according to the third baseband transmission signal, and output a third radio frequency transmission signal to a corresponding second filter; a corresponding second filter, configured to output the filtered third radio frequency transmission signal to a corresponding third antenna port. Exemplarily, the h terminal is conducted to the q1 terminal, the corresponding second filter is specifically the filter 251 connected to the q1 terminal, and the corresponding third antenna port is specifically the antenna port 31 connected to the q1 terminal. The h terminal is conducted to the q2 terminal, the corresponding second filter is specifically the filter 252 connected to the q2 terminal, and the corresponding third antenna port is specifically the antenna port 32 connected to the q2 terminal.

[0120] Alternatively, a switch 22, configured to conduct the i terminal to a fifth terminal; a corresponding filter, configured to receive a third radio frequency reception signal input through a corresponding third antenna port, output the filtered third radio frequency reception signal to a low noise amplifier circuit, and the low noise amplifier circuit, configured to output a third baseband reception signal to a reception port based on the third radio frequency reception signal. Exemplarily, the i terminal is conducted to the q1 terminal, the corresponding second filter is specifically the filter 251 connected to the q1 terminal, and the corresponding third antenna port is specifically the antenna port 31 connected to the q1 terminal. The i terminal is conducted to the q2 terminal, the corresponding second filter is specifically the filter 252 connected to the q2 terminal, and the corresponding third antenna port is specifically the antenna port 32 connected to the q2 terminal.

[0121] Specifically, Figure 9 The working state of the radio frequency circuit 20 shown can be referred to Figure 7 The working state of the radio frequency circuit 20 shown. The difference is:

[0122] In working state 1, the power amplifier circuit 21 is configured to receive a first baseband transmission signal input through a transmission port, output a first radio frequency transmission signal to the filter 24 according to the first baseband transmission signal, and the filter 24 outputs the filtered first radio frequency transmission signal to the antenna port 1.

[0123] In working state 3, the filter 24 is configured to receive a first radio frequency reception signal input through the antenna port 1, output the filtered first radio frequency reception signal to the low noise amplifier circuit 23; the low noise amplifier circuit 23 is configured to output a first baseband reception signal to a reception port according to the first radio frequency reception signal.

[0124] In working state 5, the power amplifier circuit 21 is configured to receive a third baseband transmission signal input through a transmission port, output a third radio frequency transmission signal to the filter 251 according to the first baseband transmission signal, and the filter 251 outputs the filtered third radio frequency transmission signal to the antenna port 31.

[0125] In operating state 6, filter 251 is configured to receive a third radio frequency received signal input through antenna port 31 and output the filtered third radio frequency received signal to low-noise amplifier circuit 23; low-noise amplifier circuit 23 is configured to output a third baseband received signal to the receiving port according to the third radio frequency received signal.

[0126] In operating state 7, power amplifier circuit 21 is configured to receive a third baseband transmitted signal input through the transmitting port, output a third radio frequency transmitted signal to filter 252 according to the first baseband transmitted signal, and filter 252 outputs the filtered third radio frequency transmitted signal to antenna port 32.

[0127] In operating state 8, filter 252 is configured to receive a third radio frequency received signal input through antenna port 32 and output the filtered third radio frequency received signal to low-noise amplifier circuit 23; low-noise amplifier circuit 23 is configured to output a third baseband received signal to the receiving port according to the third radio frequency received signal.

[0128] In some other embodiments, referring to Figure 10 As shown, radio frequency circuit 20 includes: power amplifier circuit 21, low-noise amplifier circuit 23, and switch 22; wherein, radio frequency circuit 20 includes a transmitting port, a receiving port, and an antenna port; switch 22 includes an h terminal, an i terminal, a j terminal, and a k terminal. Radio frequency circuit 20 further includes: filter 24 (also referred to as the first filter) and switch 26 (also referred to as the second switch); switch 26 includes an m terminal (also referred to as the sixth terminal of the second switch), an n terminal (also referred to as the seventh terminal of the second switch), and an r terminal (also referred to as the eighth terminal of the second switch).

[0129] Among them, the transmitting port of radio frequency circuit 20 is connected to the input end of power amplifier circuit 21; the receiving port of radio frequency circuit 20 is connected to the output end of low-noise amplifier circuit 23; the output end of power amplifier circuit 21 is connected to the h terminal of switch 22; the input end of low-noise amplifier circuit 23 is connected to the i terminal of switch 22. The j terminal and the k terminal of switch 22 are respectively connected to the antenna port of radio frequency circuit 20. Specifically, the j terminal of switch 22 is connected to the m terminal of switch 26 through filter 24; the k terminal of switch 22 is connected to the m terminal of switch 26; the r terminal of switch 26 is connected to the antenna port of radio frequency circuit 20.

[0130] Figure 10 The radio frequency circuit shown includes filter 24 and switch 26, and includes one antenna port, making the integration degree of radio frequency circuit 20 higher. In addition, when radio frequency circuit 20 outputs a radio frequency transmitted signal or receives a radio frequency received signal, there are only two switches, switch 22 and switch 26, on the signal transmission path, which can make the insertion loss of radio frequency circuit 20 smaller.

[0131] Exemplarily, Figure 10 The radio frequency circuit 20 shown includes the following operating states:

[0132] Operating state 1: Switch 22 is configured to conduct the h terminal and the j terminal; switch 26 is configured to conduct the r terminal and the m terminal; power amplifier circuit 21 is configured to receive a first baseband transmission signal input through a transmission port and output a first radio frequency transmission signal to filter 24 according to the first baseband transmission signal; filter 24 is configured to output the filtered first radio frequency transmission signal to an antenna port.

[0133] Operating state 2: Switch 22 is configured to conduct the h terminal and the k terminal; switch 26 is configured to conduct the r terminal and the n terminal; power amplifier circuit 21 is configured to receive a second baseband transmission signal input through a transmission port and output a second radio frequency transmission signal to the antenna port according to the second baseband transmission signal.

[0134] Operating state 3: Switch 22 is configured to conduct the i terminal and the j terminal; switch 26 is configured to conduct the r terminal and the m terminal; filter 24 is configured to receive a first radio frequency reception signal input through an antenna port and output the filtered first radio frequency reception signal to low noise amplifier circuit 23; low noise amplifier circuit 23 is configured to output a first baseband reception signal to a reception port according to the first radio frequency reception signal.

[0135] Operating state 4: Switch 22 is configured to conduct the i terminal and the k terminal; switch 26 is configured to conduct the r terminal and the n terminal; low noise amplifier circuit 23 is configured to receive a second radio frequency reception signal input through an antenna port and output a second baseband reception signal to a reception port according to the second radio frequency reception signal.

[0136] In some embodiments, compared with Figure 10 the radio frequency circuit 20 shown, Figure 11 the radio frequency circuit 20 shown further includes: at least one second filter (such as Figure 11 filter 251 and filter 252 shown); switch 22 further includes at least one fifth terminal (such as Figure 11 q1 terminal and q2 terminal shown); switch 26 further includes at least one ninth terminal (such as Figure 11 s1 terminal and s2 terminal shown); wherein, one fifth terminal of switch 22 is correspondingly connected to one ninth terminal of switch 26 through one second filter. For example, the q1 terminal of switch 22 is connected to the s1 terminal of switch 26 through filter 251, and the q2 terminal of switch 22 is connected to the s2 terminal of switch 26 through filter 252.

[0137] Switch 22 is configured to conduct the h terminal to a fifth terminal; switch 26 is configured to conduct the r terminal to a corresponding ninth terminal; power amplifier circuit 21 is configured to receive a third baseband transmission signal input through a transmission port and output a third radio frequency transmission signal to a corresponding second filter according to the third baseband transmission signal; the corresponding second filter is configured to output the filtered third radio frequency transmission signal to an antenna port. Exemplarily, the h terminal is conducted to the q1 terminal, the corresponding second filter is specifically filter 251 connected to the q1 terminal, and the corresponding ninth terminal is specifically the s1 terminal connected to the q1 terminal. The h terminal is conducted to the q2 terminal, the corresponding second filter is specifically filter 252 connected to the q2 terminal, and the corresponding ninth terminal is specifically the s2 terminal connected to the q2 terminal.

[0138] Alternatively, switch 22 is configured to conduct the i terminal to a fifth terminal; switch 26 is configured to conduct the r terminal to a corresponding ninth terminal; the corresponding second filter is configured to receive a third radio frequency reception signal input through an antenna port and output the filtered third radio frequency reception signal to a low noise amplifier circuit 23; low noise amplifier circuit 23 is configured to output a third baseband reception signal to a reception port according to the third radio frequency reception signal. Exemplarily, the i terminal is conducted to the q1 terminal, the corresponding second filter is specifically filter 251 connected to the q1 terminal, and the corresponding ninth terminal is specifically the s1 terminal connected to the q1 terminal. The i terminal is conducted to the q2 terminal, the corresponding second filter is specifically filter 252 connected to the q2 terminal, and the corresponding ninth terminal is specifically the s2 terminal connected to the q2 terminal.

[0139] Specifically, Figure 1L the working states of the shown radio frequency circuit 20 include Figure 10 the working states of the shown radio frequency circuit 20 further include the following working states:

[0140] Working state 5: Switch 22 is configured to conduct the h terminal to the q1 terminal; switch 26 is configured to conduct the r terminal to the s1 terminal; power amplifier circuit 21 is configured to receive a third baseband transmission signal input through a transmission port and output a third radio frequency transmission signal to filter 251 according to the third baseband transmission signal; filter 251 is configured to output the filtered third radio frequency transmission signal to an antenna port.

[0141] Working state 6: Switch 22 is configured to conduct the i terminal to the q1 terminal; switch 26 is configured to conduct the r terminal to the s1 terminal; filter 251 is configured to receive a third radio frequency reception signal input through an antenna port and output the filtered third radio frequency reception signal to low noise amplifier circuit 23; low noise amplifier circuit 23 is configured to output a third baseband reception signal to a reception port according to the third radio frequency reception signal.

[0142] Working state 7: Switch 22 is configured to conduct the h terminal and the q2 terminal; switch 26 is configured to conduct the r terminal and the s2 terminal; power amplifier circuit 21 is configured to receive a third baseband transmission signal input through a transmission port and output a third radio frequency transmission signal to filter 252 according to the third baseband transmission signal; filter 252 is configured to output the filtered third radio frequency transmission signal to an antenna port.

[0143] Working state 8: Switch 22 is configured to conduct the i terminal and the q2 terminal; switch 26 is configured to conduct the r terminal and the s2 terminal; filter 252 is configured to receive a third radio frequency reception signal input through an antenna port and output the filtered third radio frequency reception signal to low-noise amplifier circuit 23; low-noise amplifier circuit 23 is configured to output a third baseband reception signal to a reception port according to the third radio frequency reception signal.

[0144] Among them, Figure 5 、 Figure 8 and Figure 10 The switch 22 in the radio frequency circuit 20 shown is specifically a double-pole double-throw (DPDT) switch. The principle structure diagram of this double-pole double-throw switch is referred to Figure 12 shown. Among them, the h terminal of switch 22 corresponds to a metal contact, the i terminal of switch 22 corresponds to a metal contact, the j terminal of switch 22 corresponds to two metal contacts, and the k terminal of switch 22 corresponds to two metal contacts. Among them, the metal contact of the h terminal can be toggled to connect with the metal contact of the j terminal or the metal contact of the k terminal, and the metal contact of the i terminal can be toggled to connect with the metal contact of the j terminal or the metal contact of the k terminal.

[0145] Exemplarily, in order to ensure that the h terminal and the i terminal are on the same side and the j terminal and the k terminal are on the same side, referring to Figure 13 shown, Figure 12 The switch 22 shown is usually connected into the Figure 13 structure shown. The principle is the same.

[0146] Among them, Figure 6 The switch 22 in the radio frequency circuit 20 shown is specifically a double-pole triple-throw switch. Figure 7 、 Figure 9 and Figure 11 The switch 22 in the radio frequency circuit 20 shown is specifically a double-pole quadruple-throw switch. Figure 10 The switch 26 shown is specifically a single-pole double-throw (SPDT) switch. Figure 11 The switch 26 shown is specifically a single-pole quadruple-throw switch.

[0147] Exemplarily, the embodiment of the present application also provides a radio frequency system. Referring toFigure 14 , Figures 16 to 23 The radio frequency system 30 shown in any one of the figures, wherein the radio frequency system 30 includes a baseband chip 31 and at least one radio frequency circuit 20 as shown in Figures 5 to 11 any one of the figures; the radio frequency system 30 further includes a common antenna port; the baseband chip 31 is connected to the transmitting port and the receiving port of the radio frequency circuit 20; the common antenna port of the radio frequency system 30 is connected to the antenna port of the radio frequency circuit 20.

[0148] Specifically, referring to Figure 14 as shown, wherein the common antenna port of the radio frequency system 30 includes a common antenna port 1 (also referred to as the first common antenna port) and a common antenna port 2 (also referred to as the second common antenna port); wherein the radio frequency circuit 20 may specifically be Figure 5 the radio frequency circuit 20 shown, the radio frequency circuit 20 includes an antenna port 1 and an antenna port 2, the antenna port 1 is connected to the common antenna port 1, and the antenna port 2 is connected to the common antenna port 2.

[0149] Exemplarily, in the radio frequency system 30, a control circuit is provided in the baseband chip 31, and the control circuit is connected to the switch S1 and the switch 22 in the radio frequency circuit 20. Among them, when the radio frequency system 30 needs to output a radio frequency transmission signal through the common antenna port 1 of the radio frequency system 30, the control circuit in the baseband chip 31 will output a first control signal to the switch 22 to control the switch 22 to conduct the h end and the j end according to the first control signal, and control the radio frequency circuit 20 to execute the working state 1. When the radio frequency system 30 needs to output a radio frequency transmission signal through the common antenna port 2 of the radio frequency system 30, the control circuit in the baseband chip 31 will output a second control signal to the switch 22 to control the switch 22 to conduct the h end and the k end according to the second control signal, and control the radio frequency circuit 20 to execute the working state 2. When the radio frequency system 30 needs to receive a radio frequency reception signal input by the common antenna port 1, the control circuit in the baseband chip 31 will output a third control signal to the switch 22 to control the switch 22 to conduct the i end and the j end according to the third control signal, and control the radio frequency circuit 20 to execute the working state 3. When the radio frequency system 30 needs to receive a radio frequency reception signal input by the common antenna port 2, the control circuit in the baseband chip 31 will output a fourth control signal to the switch 22 to control the switch 22 to conduct the i end and the k end according to the fourth control signal, and control the radio frequency circuit 20 to execute the working state 4.

[0150] Exemplarily, within a predetermined time period, switch S1 in radio frequency circuit 20 is not conducting. When the control circuit in baseband chip 31 outputs a third control signal or a fourth control signal to switch 22 to control radio frequency circuit 20 to execute operating state 3 or operating state 4, baseband chip 31 can receive a baseband reception signal. After baseband chip 31 determines that the power of the baseband reception signal is greater than a predetermined value, the control circuit in baseband chip 31 will output a reception control signal to switch S1 to control switch S1 to conduct, thereby reducing the power of the baseband reception signal received by baseband chip 31.

[0151] In some embodiments, Figure 14 The illustrated radio frequency circuit 20 may also be Figure 6 or Figure 7 The illustrated radio frequency circuit 20. For example, when radio frequency circuit 20 is Figure 6 The illustrated radio frequency circuit 20, since radio frequency circuit 20 includes three antenna ports, radio frequency system 30 also needs to include 3 common antenna ports. One antenna port is correspondingly connected to one common antenna port, and it is possible to receive a radio frequency reception signal or output a radio frequency transmission signal from any one of the three common antenna ports through the control circuit in baseband chip 31. For example, when radio frequency circuit 20 is Figure 7 The illustrated radio frequency circuit 20, since radio frequency circuit 20 includes four antenna ports, radio frequency system 30 also needs to include 4 common antenna ports. One antenna port is correspondingly connected to one common antenna port, and it is possible to receive a radio frequency reception signal or output a radio frequency transmission signal from any one of the four common antenna ports through the control circuit in baseband chip 31.

[0152] Exemplarily, in Figure 14 The illustrated radio frequency system 30, there may also be M radio frequency circuits 20. Among them, one radio frequency circuit 20 includes N antenna ports, M is a positive integer greater than or equal to 1, N is a positive integer greater than or equal to 1, and M radio frequency circuits 20 include M×N antenna ports. Then radio frequency system 30 needs to include M×N common antenna ports. One antenna port is correspondingly connected to one common antenna port, and it is possible to receive a radio frequency reception signal or output a radio frequency transmission signal from any one of the M×N common antenna ports through the control circuit in baseband chip 31.

[0153] Exemplarily, referring to Figure 15 Shown, an embodiment of the present application provides a structural schematic diagram of a communication device 40. The communication device 40 includes antennas (such as Figure 15 Antenna 1 and antenna 2 shown) and Figure 14 The illustrated radio frequency system 30. Among them, the antenna is connected to the common antenna port of radio frequency system 30. Specifically, Figure 14The shown radio frequency system 30 includes two common antenna ports. The communication device 40 is provided with two antennas. Antenna 1 is connected to common antenna port 1, and antenna 2 is connected to common antenna port 2.

[0154] When antenna 1 covers the first area, antenna 2 covers the second area, and the first area and the second area partially overlap or do not overlap, the operation of the communication device 40 is as follows:

[0155] In the first time period, the baseband chip 31 generates a baseband transmission signal. The baseband chip 31 controls the radio frequency circuit 20 to be in operating state 1. Then the radio frequency circuit 20 outputs a radio frequency transmission signal to antenna port 1. This radio frequency transmission signal will be transmitted to antenna 1 and radiated to the first area by antenna 1.

[0156] In the second time period, the baseband chip 31 generates a baseband transmission signal. The baseband chip 31 controls the radio frequency circuit 20 to be in operating state 2. Then the radio frequency circuit 20 outputs a radio frequency transmission signal to antenna port 2. This radio frequency transmission signal will be transmitted to antenna 2 and radiated to the second area by antenna 2.

[0157] In the third time period, the baseband chip 31 controls the radio frequency circuit 20 to be in operating state 3. Then the radio frequency circuit 20 receives a radio frequency reception signal in the first area and outputs a baseband reception signal to the reception port. The baseband chip 31 analyzes the transmission data in the first area according to the baseband reception signal.

[0158] In the fourth time period, the baseband chip 31 controls the radio frequency circuit 20 to be in operating state 4. Then the radio frequency circuit 20 receives a radio frequency reception signal in the second area and outputs a baseband reception signal to the reception port. The baseband chip 31 analyzes the transmission data in the second area according to the baseband reception signal.

[0159] In some other embodiments, referring to Figure 16 As shown, the embodiment of the present application further provides a schematic structural diagram of a radio frequency system 30. Among them, Figure 16 The common antenna ports in the shown radio frequency system 30 include common antenna port 1 and common antenna port 2. Among them, Figure 16 The radio frequency circuit 20 in the shown radio frequency system 30 is specifically Figure 8 The radio frequency circuit 20 shown. The radio frequency circuit 20 includes antenna port 1 and antenna port 2. Antenna port 1 is connected to common antenna port 1, and antenna port 2 is connected to common antenna port 2. And it can receive a radio frequency reception signal or output a radio frequency transmission signal from any one of the two common antenna ports through the control circuit in the baseband chip 31.

[0160] Exemplarily, when the baseband chip 31 supports multiple input multiple output (MIMO), refer to Figure 17 as shown, where Figure 17 the radio frequency system 30 shown supports four-in-four-out. The radio frequency system 30 includes four radio frequency circuits 20, namely radio frequency circuit 20-1, radio frequency circuit 20-2, radio frequency circuit 20-3, and radio frequency circuit 20-4. Among them, the four radio frequency circuits 20 are Figure 8 the radio frequency circuit 20 shown. The radio frequency system 30 includes 8 common antenna ports. The antenna port 1 of the radio frequency circuit 20-1 is connected to the common antenna port 1, and the antenna port 2 is connected to the common antenna port 2. The antenna port 1 of the radio frequency circuit 20-2 is connected to the common antenna port 3, and the antenna port 2 is connected to the common antenna port 4. The antenna port 1 of the radio frequency circuit 20-3 is connected to the common antenna port 5, and the antenna port 2 is connected to the common antenna port 6. The antenna port 1 of the radio frequency circuit 20-4 is connected to the common antenna port 7, and the antenna port 2 is connected to the common antenna port 8.

[0161] Among them, the frequency ranges of the filters 24 in the radio frequency circuit 20-1 and the filters 24 in the radio frequency circuit 20-2 are the first frequency band, and the frequency ranges of the filters 24 in the radio frequency circuit 20-3 and the filters 24 in the radio frequency circuit 20-4 are the second frequency band. The radio frequency system 30 can receive radio frequency reception signals in the first frequency band, output radio frequency transmission signals in the first frequency band, and / or receive radio frequency reception signals in the second frequency band and output radio frequency transmission signals in the second frequency band.

[0162] The radio frequency system 30 includes the following working modes:

[0163] Working mode 1: The radio frequency system 30 receives radio frequency reception signals in the first frequency band and outputs radio frequency transmission signals in the first frequency band.

[0164] When the radio frequency system 30 outputs radio frequency transmission signals, the baseband chip 31 controls the radio frequency circuit 20-1 to execute working state 2, the radio frequency circuit 20-2 to execute working state 2, the radio frequency circuit 20-3 to execute working state 2, and the radio frequency circuit 20-4 to execute working state 2. The baseband chip 31 generates four baseband transmission signals in the first frequency band. The radio frequency circuits 20-1, 20-2, 20-3, and 20-4 respectively receive one baseband transmission signal in the first frequency band and output one radio frequency transmission signal in the first frequency band. The radio frequency system 30 can finally output four radio frequency transmission signals in the first frequency band from the common antenna ports 2, 4, 6, and 8.

[0165] When the RF system 30 receives an RF reception signal, the baseband chip 31 controls the RF circuit 20-1 to execute operating state 4, the RF circuit 20-2 to execute operating state 4, the RF circuit 20-3 to execute operating state 4, and the RF circuit 20-4 to execute operating state 4. The RF system 30 can receive four RF reception signals in the first frequency band from the common antenna ports 2, common antenna ports 4, common antenna ports 6, and common antenna ports 8. The RF circuit 20-1, RF circuit 20-2, RF circuit 20-3, and RF circuit 20-4 respectively receive one RF reception signal in the first frequency band and output one baseband reception signal in the first frequency band to the baseband chip 31. The baseband chip 31 can ultimately receive four baseband reception signals in the first frequency band.

[0166] Operating mode 2: The RF system 30 receives an RF reception signal in the second frequency band and outputs an RF transmission signal in the second frequency band. This operating mode is similar to the above-mentioned operating mode 1, except that the baseband chip 31 outputs four baseband transmission signals in the second frequency band and receives four baseband reception signals in the second frequency band, which will not be elaborated here.

[0167] Operating mode 3: The RF system 30 receives an RF reception signal in the first frequency band and outputs an RF transmission signal in the first frequency band, and receives an RF reception signal in the second frequency band and outputs an RF transmission signal in the second frequency band.

[0168] In this operating mode, the RF system 30 receiving an RF reception signal in the first frequency band and outputting an RF transmission signal in the first frequency band and the RF system receiving an RF reception signal in the second frequency band and outputting an RF transmission signal in the second frequency band are independent of each other.

[0169] When the RF system 30 outputs an RF transmission signal in the first frequency band, the baseband chip 31 controls the RF circuit 20-1 to execute operating state 1 and the RF circuit 20-2 to execute operating state 1. The baseband chip 31 generates two baseband transmission signals in the first frequency band. The RF circuit 2(0-1) and the RF circuit 20-2 respectively receive one baseband transmission signal in the first frequency band and output one RF transmission signal in the first frequency band. The RF system 30 can ultimately output two RF transmission signals in the first frequency band from the common antenna ports 1 and common antenna ports 3.

[0170] When the radio frequency system 30 receives radio frequency reception signals in the first frequency band, the baseband chip 31 controls the radio frequency circuit 20-1 to execute operating state 3 and the radio frequency circuit 20-2 to execute operating state 3. The radio frequency system 30 can receive two radio frequency reception signals in the first frequency band from the common antenna port 1 and the common antenna port 3. The radio frequency circuit 20-1 and the radio frequency circuit 20-2 respectively receive one radio frequency reception signal in the first frequency band and output one baseband reception signal in the first frequency band to the baseband chip 31. The baseband chip 31 can ultimately receive two baseband reception signals in the first frequency band.

[0171] When the radio frequency system 30 outputs radio frequency transmission signals in the second frequency band, the baseband chip 31 controls the radio frequency circuit 20-3 to execute operating state 1 and the radio frequency circuit 20-4 to execute operating state 1. The baseband chip 31 generates two baseband transmission signals in the second frequency band. The radio frequency circuit 20-3 and the radio frequency circuit 20-4 respectively receive one baseband transmission signal in the second frequency band and output one radio frequency transmission signal in the second frequency band. The radio frequency system 30 can ultimately output two radio frequency transmission signals in the second frequency band from the common antenna port 5 and the common antenna port 7.

[0172] When the radio frequency system 30 receives radio frequency reception signals in the second frequency band, the baseband chip 31 controls the radio frequency circuit 20-3 to execute operating state 3 and the radio frequency circuit 20-4 to execute operating state 3. The radio frequency system 30 can receive two radio frequency reception signals in the second frequency band from the common antenna port 5 and the common antenna port 7. The radio frequency circuit 20-3 and the radio frequency circuit 20-4 respectively receive one radio frequency reception signal in the second frequency band and output one baseband reception signal in the second frequency band to the baseband chip 31. The baseband chip 31 can ultimately receive two baseband reception signals in the second frequency band.

[0173] Exemplarily, the above-mentioned operating mode 1 and operating mode 2 are also referred to as the single-frequency operating mode of the radio frequency system 10, and the above-mentioned operating mode 3 is also referred to as the dual-frequency operating mode of the radio frequency system 30.

[0174] In some other embodiments, refer to Figure 18 as shown Figure 18The shown radio frequency system 30 supports three inputs and three outputs. The radio frequency system 30 includes three radio frequency circuits 20, namely radio frequency circuit 20-1, radio frequency circuit 20-2, and radio frequency circuit 20-3. Each radio frequency circuit 20 includes antenna port 1, antenna port 2, and antenna port 3. The radio frequency system 30 includes 9 common antenna ports. The antenna port 1 of radio frequency circuit 20-1 is connected to common antenna port 1, the antenna port 2 is connected to common antenna port 2, and the antenna port 3 is connected to common antenna port 3. The antenna port 1 of radio frequency circuit 20-2 is connected to common antenna port 4, the antenna port 2 is connected to common antenna port 5, and the antenna port 3 is connected to common antenna port 6. The antenna port 1 of radio frequency circuit 20-3 is connected to common antenna port 7, the antenna port 2 is connected to common antenna port 8, and the antenna port 3 is connected to common antenna port 9.

[0175] Among them, the frequency ranges of the filters 24 in radio frequency circuit 20-1 and the filters 24 in radio frequency circuit 20-3 are the first frequency band. The frequency ranges of the filters 251 in radio frequency circuit 20-1 and the filters 24 in radio frequency circuit 20-2 are the second frequency band. The frequency ranges of the filters 251 in radio frequency circuit 20-2 and the filters 251 in radio frequency circuit 20-3 are the third frequency band. The radio frequency system 30 can receive radio frequency receiving signals in the first frequency band and output radio frequency transmitting signals in the first frequency band, and / or receive radio frequency receiving signals in the second frequency band and output radio frequency transmitting signals in the second frequency band, and / or receive radio frequency receiving signals in the third frequency band and output radio frequency transmitting signals in the third frequency band.

[0176] Among them, the radio frequency circuit 30 further includes operating state 6 (the h end and the q1 end of switch 22 are conducting) and operating state 7 (the i end and the q1 end of switch 22 are conducting).

[0177] Figure 18 The shown radio frequency system 30 can be in a single-frequency operating mode. The output of the radio frequency transmitting signal is that the baseband chip 31 controls radio frequency circuit 20-1 to execute operating state 2, radio frequency circuit 20-2 to execute operating state 2, and radio frequency circuit 20-3 to execute operating state 2. The reception of the radio frequency receiving signal is that the baseband chip 31 controls radio frequency circuit 20-1 to execute operating state 4, radio frequency circuit 20-2 to execute operating state 4, and radio frequency circuit 20-3 to execute operating state 4.

[0178] Figure 18The shown radio frequency system 30 can operate in a dual - band mode. The dual - bands are the first band and the second band. At this time, the baseband chip 31 always controls the switch 22 of the radio frequency circuit 20 - 3 not to conduct. When outputting the radio frequency transmission signal of the first band, the baseband chip 31 controls the radio frequency circuit 20 - 1 to execute the working state 1. When receiving the radio frequency reception signal of the first band, the baseband chip 31 controls the radio frequency circuit 20 - 1 to execute the working state 3. When outputting the radio frequency transmission signal of the second band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 1. When receiving the radio frequency reception signal of the second band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 3. The dual - bands are the first band and the third band. At this time, the baseband chip 31 always controls the switch 22 of the radio frequency circuit 20 - 3 not to conduct. When outputting the radio frequency transmission signal of the first band, the baseband chip 31 controls the radio frequency circuit 20 - 1 to execute the working state 1. When receiving the radio frequency reception signal of the first band, the baseband chip 31 controls the radio frequency circuit 20 - 1 to execute the working state 3. When outputting the radio frequency transmission signal of the third band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 5. When receiving the radio frequency reception signal of the third band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 6. The dual - bands are the second band and the third band. At this time, the baseband chip 31 always controls the switch 22 of the radio frequency circuit 20 - 1 not to conduct. When outputting the radio frequency transmission signal of the second band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 1. When receiving the radio frequency reception signal of the second band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 3. When outputting the radio frequency transmission signal of the third band, the baseband chip 31 controls the radio frequency circuit 20 - 3 to execute the working state 5. When receiving the radio frequency reception signal of the third band, the baseband chip 31 controls the radio frequency circuit 20 - 3 to execute the working state 6.

[0179] Of course, the above is only one embodiment, and any permutation and combination scheme can be selected to achieve the dual - band working mode.

[0180] Figure 18 The shown radio frequency system 30 can operate in a triple - band mode. When outputting the radio frequency transmission signal of the first band, the baseband chip 31 controls the radio frequency circuit 20 - 1 to execute the working state 1. When receiving the radio frequency reception signal of the first band, the baseband chip 31 controls the radio frequency circuit 20 - 1 to execute the working state 3. When outputting the radio frequency transmission signal of the second band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 1. When receiving the radio frequency reception signal of the second band, the baseband chip 31 controls the radio frequency circuit 20 - 2 to execute the working state 3. When outputting the radio frequency transmission signal of the third band, the baseband chip 31 controls the radio frequency circuit 20 - 3 to execute the working state 5. When receiving the radio frequency reception signal of the third band, the baseband chip 31 controls the radio frequency circuit 20 - 3 to execute the working state 6.

[0181] Exemplarily, Figure 18The illustrated radio frequency system 30 may further include more radio frequency circuits 20, which may enable Figure 18 the illustrated radio frequency system 30 to output multiple radio frequency transmission signals in the same frequency band and receive multiple radio frequency reception signals in the same frequency band. Alternatively, a multi-frequency operating mode may be implemented.

[0182] In some embodiments, referring to Figure 19 the illustration, compared with Figure 16 the illustrated radio frequency system 30, Figure 19 the radio frequency circuit 20 in the illustrated radio frequency system 30 is specifically Figure 5 the illustrated radio frequency circuit 20, Figure 19 the illustrated radio frequency system 30 further includes a filter 32 (also referred to as the third filter). The common antenna ports of the radio frequency system 30 include common antenna port 1 and common antenna port 2; antenna port 1 of the radio frequency circuit 20 is connected to common antenna port 1 through the filter 32, and antenna port 2 is connected to common antenna port 2.

[0183] Exemplarily, when Figure 19 the illustrated filter 32 and Figure 16 the illustrated filter 24 are exactly the same, Figure 19 the illustrated radio frequency system 30 and Figure 16 the illustrated radio frequency system 30 are equivalent. For its specific functions, refer to Figure 16 the illustration, which will not be elaborated here.

[0184] In some embodiments, referring to Figure 20 the illustration, Figure 20 the illustrated radio frequency system 30 supports four inputs and four outputs. The radio frequency system 30 includes four radio frequency circuits 20, namely radio frequency circuit 20-1, radio frequency circuit 20-2, radio frequency circuit 20-3, and radio frequency circuit 20-4. Among them, the four radio frequency circuits 20 are Figure 5 the illustrated radio frequency circuit 20. The radio frequency system 30 includes 8 common antenna ports and 4 filters 32. Antenna port 1 of radio frequency circuit 20-1 is connected to common antenna port 1 through filter 32-1, and antenna port 2 is connected to common antenna port 2. Antenna port 1 of radio frequency circuit 20-2 is connected to common antenna port 3 through filter 32-2, and antenna port 2 is connected to common antenna port 4. Antenna port 1 of radio frequency circuit 20-3 is connected to common antenna port 5 through filter 32-3, and antenna port 2 is connected to common antenna port 6. Antenna port 1 of radio frequency circuit 20-4 is connected to common antenna port 7 through filter 32-4, and antenna port 2 is connected to common antenna port 8.

[0185] Among them, the frequency ranges of filter 32-1 and filter 32-2 are the first frequency band, and the frequency ranges of filter 32-3 and filter 32-4 are the second frequency band.Figure 20 The shown radio frequency system 30 is equivalent to Figure 17 the shown radio frequency system 30, and its specific functions are referred to Figure 17 as shown, which will not be elaborated here.

[0186] In some other embodiments, referring to Figure 21 as shown, the common antenna port of the radio frequency system 30 includes one; wherein, the radio frequency circuit 20 may specifically be Figure 10 the shown radio frequency circuit 20, and the radio frequency circuit 20 includes an antenna port, and the antenna port is connected to the common antenna port.

[0187] Exemplarily, in Figure 21 the shown radio frequency system 30, the control circuit in the baseband chip 31 is connected to the switch S1, switch 22, and switch 26 in the radio frequency circuit 20. Among them, when the radio frequency system 30 needs to output a filtered radio frequency transmission signal, the control circuit in the baseband chip 31 will output a first control signal to switch 22 and a fifth control signal to switch 26, so as to control switch 22 to conduct the h terminal and the j terminal of switch 22 according to the first control signal, control switch 26 to conduct the m terminal and the r terminal of switch 26 according to the fifth control signal, and control the radio frequency circuit 20 to execute operating state 1. When the radio frequency system 30 needs to output an unfiltered radio frequency transmission signal, the control circuit in the baseband chip 31 will output a second control signal to switch 22 and a sixth control signal to switch 26, so as to control switch 22 to conduct the h terminal and the k terminal of switch 22 according to the second control signal, control switch 26 to conduct the n terminal and the r terminal of switch 26 according to the sixth control signal, and control the radio frequency circuit 20 to execute operating state 2. When the radio frequency system 30 needs to receive a filtered radio frequency reception signal, the control circuit in the baseband chip 31 will output a third control signal to switch 22 and a fifth control signal to switch 26, so as to control switch 22 to conduct the i terminal and the j terminal of switch 22 according to the third control signal, control switch 26 to conduct the m terminal and the r terminal of switch 26 according to the fifth control signal, and control the radio frequency circuit 20 to execute operating state 3. When the radio frequency system 30 needs to receive an unfiltered radio frequency reception signal, the control circuit in the baseband chip 31 will output a fourth control signal to switch 22 and a sixth control signal to switch 26, so as to control switch 22 to conduct the i terminal and the k terminal of switch 22 according to the fourth control signal, control switch 26 to conduct the n terminal and the r terminal of switch 26 according to the sixth control signal, and control the radio frequency circuit 20 to execute operating state 4.

[0188] Exemplarily, the process of the radio frequency circuit 20 controlling switch S1 refers to the above Figure 14 process of the radio frequency circuit 20 controlling switch S1, which will not be elaborated here.

[0189] In some embodiments, Figure 21The RF circuit 20 shown may also be Figure 11 the RF circuit 20 shown, and the embodiments of the present application do not limit this.

[0190] In some other embodiments, referring to Figure 22 shown, the embodiments of the present application further provide a schematic structural diagram of a RF system 30, where Figure 22 the RF system 30 shown supports four inputs and four outputs. The RF system 30 includes four RF circuits 20, namely RF circuit 20-1, RF circuit 20-2, RF circuit 20-3, and RF circuit 20-4. Among them, the four RF circuits 20 are Figure 10 the RF circuit 20 shown. The RF system 30 includes 4 common antenna ports. The antenna port of RF circuit 20-1 is connected to common antenna port 1. The antenna port of RF circuit 20-2 is connected to common antenna port 2. The antenna port of RF circuit 20-3 is connected to common antenna port 3. The antenna port of RF circuit 20-4 is connected to common antenna port 4.

[0191] Among them, the frequency ranges of the filters 24 in RF circuit 20-1 and the filters 24 in RF circuit 20-2 are the first frequency band, and the frequency ranges of the filters 24 in RF circuit 20-3 and the filters 24 in RF circuit 20-4 are the second frequency band. The RF system 30 can receive RF reception signals in the first frequency band, output RF transmission signals in the first frequency band, and / or receive RF reception signals in the second frequency band and output RF transmission signals in the second frequency band.

[0192] Exemplarily, in the RF system 30, it receives RF reception signals in the first frequency band and outputs RF transmission signals in the first frequency band, or receives RF reception signals in the second frequency band and outputs RF transmission signals in the second frequency band. The RF system 30 is in a single-frequency operating mode. When outputting RF transmission signals, the baseband chip 31 controls RF circuit 20-1 to execute operating state 2, RF circuit 20-2 to execute operating state 2, RF circuit 20-3 to execute operating state 2, and RF circuit 20-4 to execute operating state 2. When receiving RF reception signals, the baseband chip 31 controls RF circuit 20-1 to execute operating state 4, RF circuit 20-2 to execute operating state 4, RF circuit 20-3 to execute operating state 4, and RF circuit 20-4 to execute operating state 4.

[0193] Figure 22The RF system 30 shown can operate in a dual - band mode. Among them, to output the RF transmission signal of the first band, the baseband chip 31 controls the RF circuit 20 - 1 to execute operating state 1 and the RF circuit 20 - 2 to execute operating state 1, and then outputs two RF transmission signals of the first band from the common antenna port 1 and the common antenna port 2. To receive the RF reception signal of the first band, the baseband chip 31 controls the RF circuit 20 - 1 to execute operating state 3 and the RF circuit 20 - 2 to execute operating state 3, and then receives two RF reception signals of the first band from the common antenna port 1 and the common antenna port 2. To output the RF transmission signal of the second band, the baseband chip 31 controls the RF circuit 20 - 3 to execute operating state 1 and the RF circuit 20 - 4 to execute operating state 1, and then outputs two RF transmission signals of the second band from the common antenna port 3 and the common antenna port 4. To receive the RF reception signal of the second band, the baseband chip 31 controls the RF circuit 20 - 3 to execute operating state 3 and the RF circuit 20 - 4 to execute operating state 3, and then receives two RF reception signals of the second band from the common antenna port 3 and the common antenna port 4.

[0194] In some other embodiments, referring to Figure 23 shown, based on the Figure 16 RF system 20 shown, by setting a fourth switch ( Figure 23 the switch 33 shown), the RF system 30 can include a common antenna port. Exemplarily, compared with the Figure 16 RF circuit 20 shown, Figure 23 the RF circuit 20 shown further includes a switch 33 (also referred to as the fourth switch). The switch 33 includes a t - terminal (also referred to as the tenth terminal of the switch 33), a u - terminal (also referred to as the eleventh terminal of the switch 33), and a v - terminal (also referred to as the twelfth terminal of the switch 33); among them, the RF circuit 20 is specifically the Figure 8 RF circuit 10 shown. The RF circuit 20 includes a filter 24, and the antenna ports of the RF circuit 20 include antenna port 1 and antenna port 2. Among them, antenna port 1 is connected to the t - terminal of the switch 33; antenna port 2 is connected to the u - terminal of the switch 33; the v - terminal of the switch 33 is connected to the common antenna port of the RF system 30.

[0195] Exemplarily, in Figure 23In the radio frequency system 30 shown, the control circuit in the baseband chip 31 is connected to the switch S1, switch 22, and switch 33 in the radio frequency circuit 20. Among them, when the radio frequency system 30 needs to output a filtered radio frequency transmission signal, the control circuit in the baseband chip 31 outputs a first control signal to the switch 22 to control the switch 22 to conduct the h terminal and the j terminal of the switch 22 according to the first control signal, and controls the radio frequency circuit 20 to execute operating state 1; the control circuit in the baseband chip 31 also outputs a seventh control signal to the switch 33 to control the switch 33 to conduct the t terminal and the v terminal of the switch 33 according to the seventh control signal. When the radio frequency system 30 needs to output an unfiltered radio frequency transmission signal, the control circuit in the baseband chip 31 outputs a second control signal to the switch 22 to control the switch 22 to conduct the h terminal and the k terminal of the switch 22 according to the second control signal, and controls the radio frequency circuit 20 to execute operating state 2; the control circuit in the baseband chip 31 also outputs an eighth control signal to the switch 33 to control the switch 33 to conduct the u terminal and the v terminal of the switch 33 according to the eighth control signal. When the radio frequency system 30 needs to receive a filtered radio frequency reception signal, the control circuit in the baseband chip 31 outputs a third control signal to the switch 22 to control the switch 22 to conduct the i terminal and the j terminal of the switch 22 according to the third control signal, and controls the radio frequency circuit 20 to execute operating state 3; the control circuit in the baseband chip 31 also outputs a seventh control signal to the switch 33 to control the switch 33 to conduct the t terminal and the v terminal of the switch 33 according to the seventh control signal. When the radio frequency system 30 needs to receive an unfiltered radio frequency reception signal, the control circuit in the baseband chip 31 outputs a fourth control signal to the switch 22 to control the switch 22 to conduct the i terminal and the k terminal of the switch 22 according to the fourth control signal, and controls the radio frequency circuit 20 to execute operating state 4; the control circuit in the baseband chip 31 also outputs an eighth control signal to the switch 33 to control the switch 33 to conduct the t terminal and the u terminal of the switch 33 according to the eighth control signal.

[0196] In some other embodiments, refer to Figure 24 shown, in Figure 19 Based on the radio frequency system 20 shown, a common antenna port can be included in the radio frequency system 30 by setting a fourth switch. Exemplarily, compared with Figure 19 the radio frequency circuit 20 shown, Figure 24 the radio frequency circuit 20 shown not only includes a filter 32, but also includes a switch 33 (also referred to as the fourth switch), and the switch 33 includes a t terminal (also referred to as the tenth terminal of the switch 33), a u terminal (also referred to as the eleventh terminal of the switch 33), and a v terminal (also referred to as the twelfth terminal of the switch 33); among them, the radio frequency circuit 20 is specifically Figure 5The shown radio frequency circuit 10, the antenna ports of the radio frequency circuit 20 include antenna port 1 and antenna port 2. Among them, antenna port 1 is connected to the t terminal of switch 33 through filter 32; antenna port 2 is connected to the u terminal of switch 33; the v terminal of switch 33 is connected to the common antenna port of radio frequency system 30.

[0197] Exemplarily, in Figure 24 the shown filter 32 and Figure 23 the shown filter 24 are exactly the same, Figure 24 the shown radio frequency system 30 and Figure 23 the shown radio frequency system 30 are equivalent, and its specific functions are as shown in Figure 23 which will not be elaborated here.

[0198] Exemplarily, Figure 23 or Figure 24 the shown radio frequency system can achieve multiple inputs and multiple outputs by setting multiple radio frequency circuits 20, which will not be elaborated here.

[0199] Exemplarily, an embodiment of the present application further provides a communication device, which includes an antenna and a radio frequency system 30 as shown in Figures 16 to 18 any one of the figures, where the antenna is connected to the common antenna port of the radio frequency system 30. Specifically, if the radio frequency system 30 includes X common antenna ports, the communication device includes X antennas, and one antenna is correspondingly connected to one common antenna port of the radio frequency system 30.

[0200] Although the present application has been described in combination with specific features and their embodiments, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application defined by the appended claims, and are considered to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these changes and modifications.

Claims

1. A radio frequency circuit, characterized in that: include: A power amplifier circuit, a low-noise amplifier circuit, and a first switch; The radio frequency circuit includes a transmitting port, a receiving port and an antenna port; the first switch includes a first end, a second end, a third end and a fourth end; The transmitting port of the radio frequency circuit is connected to the input end of the power amplifier circuit; the receiving port of the radio frequency circuit is connected to the output end of the low noise amplifier circuit; The output end of the power amplifier circuit is connected to the first end of the first switch; The input end of the low-noise amplifier circuit is connected to the second end of the first switch; The third end and the fourth end of the first switch are respectively connected to the antenna port of the radio frequency circuit.

2. The radio frequency circuit according to claim 1, wherein: The antenna port includes a first antenna port and a second antenna port; The third end of the first switch is connected to the first antenna port of the radio frequency circuit; The fourth end of the first switch is connected to the second antenna port of the radio frequency circuit.

3. The radio frequency circuit according to claim 2, characterized in that: The first switch is configured to conduct the first end and the third end; The power amplifier circuit is configured to receive a first baseband transmit signal input through the transmit port, and output a first radio frequency transmit signal to the first antenna port according to the first baseband transmit signal; or, The first switch is configured to conduct the first end and the fourth end; The power amplification circuit is configured to receive a second baseband transmit signal input through the transmit port, and output a second RF transmit signal to the second antenna port according to the second baseband transmit signal; or, The first switch is configured to conduct the second end and the third end; The low-noise amplifier circuit is configured to receive a first radio frequency receiving signal input through the first antenna port, and output a first baseband receiving signal to the receiving port according to the first radio frequency receiving signal; or, The first switch is configured to conduct the second end and the fourth end; The low-noise amplifier circuit is configured to receive a second radio frequency receiving signal input through the second antenna port, and output a second baseband receiving signal to the receiving port according to the second radio frequency receiving signal.

4. The radio frequency circuit according to claim 2, wherein: The antenna port further includes at least one third antenna port; the first switch further includes at least one fifth terminal; The fifth end of the first switch is correspondingly connected to the third antenna port of the radio frequency circuit.

5. The radio frequency circuit according to claim 4, characterized in that: The first switch is configured to conduct the first terminal to one of the fifth terminals; The power amplifier circuit is configured to receive a third baseband transmit signal input through the transmit port, and output a third RF transmit signal to the corresponding third antenna port according to the third baseband transmit signal; or, The first switch is configured to conduct the second terminal to one of the fifth terminals; The low-noise amplifier circuit is configured to receive a third radio frequency receiving signal input through the corresponding third antenna port, and output a third baseband receiving signal to the receiving port according to the third radio frequency receiving signal.

6. The radio frequency circuit according to claim 2, characterized in that: The radio frequency circuit further includes: a first filter; The third end of the first switch is connected to the first antenna port of the radio frequency circuit through the first filter.

7. The radio frequency circuit according to claim 6, characterized in that: The radio frequency circuit further includes: at least one second filter; the antenna port further includes at least one third antenna port; the first switch further includes at least one fifth terminal; The fifth end of the first switch is correspondingly connected to the third antenna port of the radio frequency circuit through the second filter.

8. The radio frequency circuit according to claim 1, wherein: The radio frequency circuit further includes: a first filter and a second switch; The second switch includes a sixth terminal, a seventh terminal, and an eighth terminal; The third end of the first switch is connected to the sixth end of the second switch through the first filter; The fourth end of the first switch is connected to the seventh end of the second switch; The eighth end of the second switch is connected to the antenna port of the radio frequency circuit.

9. The radio frequency circuit according to claim 8, characterized in that: The first switch is configured to conduct the first end and the third end; The second switch is configured to conduct the eighth terminal and the sixth terminal; The power amplifier circuit is configured to receive a first baseband transmit signal input through the transmit port, and output a first radio frequency transmit signal to the first filter according to the first baseband transmit signal; The first filter is configured to output the filtered first RF transmit signal to the antenna port; or, The first switch is configured to conduct the first end and the fourth end; The second switch is configured to conduct the eighth terminal and the seventh terminal; The power amplifier circuit is configured to receive a second baseband transmit signal input through the transmit port, and output a second radio frequency transmit signal to the antenna port according to the second baseband transmit signal; or, The first switch is configured to conduct the second end and the third end; The second switch is configured to conduct the eighth terminal and the sixth terminal; The first filter is configured to receive a first radio frequency receiving signal input through the antenna port and output the filtered first radio frequency receiving signal to the low noise amplifier circuit; The low-noise amplifier circuit is configured to output a first baseband received signal to the receiving port according to the first RF received signal; or, The first switch is configured to conduct the second end and the fourth end; The second switch is configured to conduct the eighth terminal and the seventh terminal; The low-noise amplifier circuit is configured to receive a second radio frequency receiving signal input through the antenna port, and output a second baseband receiving signal to the receiving port according to the second radio frequency receiving signal.

10. The radio frequency circuit according to claim 8, characterized in that: The radio frequency circuit further includes: at least one second filter; The first switch further includes at least one fifth terminal; the second switch further includes at least one ninth terminal; The fifth terminal of the first switch is correspondingly connected to the ninth terminal of the second switch through the second filter.

11. The radio frequency circuit according to claim 10, characterized in that: The first switch is configured to conduct the first terminal to one of the fifth terminals; The second switch is configured to conduct the eighth terminal to the corresponding ninth terminal; The power amplifier circuit is configured to receive a third baseband transmit signal input through the transmit port, and output a third RF transmit signal to the corresponding second filter according to the third baseband transmit signal; Correspondingly, the second filter is configured to output the filtered third RF transmit signal to the antenna port; or, The first switch is configured to conduct the second terminal to one of the fifth terminals; The second switch is configured to conduct the eighth terminal to the corresponding ninth terminal; Correspondingly, the second filter is configured to receive a third radio frequency received signal input through the antenna port and output the filtered third radio frequency received signal to the low-noise amplifier circuit; The low-noise amplifier circuit is configured to output a third baseband reception signal to the reception port according to the third radio frequency reception signal.

12. The radio frequency circuit according to any one of claims 1 to 11, characterized in that: The low-noise amplifier circuit includes a low-noise amplifier, an attenuator, and a third switch; The attenuator and the third switch are connected in series between the input end of the low-noise amplifier circuit and the output end of the low-noise amplifier circuit; The low noise amplifier is connected between the input end of the low noise amplifier circuit and the output end of the low noise amplifier circuit.

13. A radio frequency system, characterized in that: include: A baseband chip and at least one radio frequency circuit according to any one of claims 1 to 12; The radio frequency system also includes a common antenna port; The baseband chip is connected to the transmitting port and the receiving port of the radio frequency circuit; The common antenna port of the radio frequency system is connected to the antenna port of the radio frequency circuit.

14. The radio frequency system according to claim 13, characterized in that The public antenna port of the radio frequency system includes a first public antenna port and a second public antenna port; The antenna port of the radio frequency circuit includes a first antenna port and a second antenna port; The first antenna port is connected to the first common antenna port, and the second antenna port is connected to the second common antenna port.

15. The radio frequency system according to claim 14, characterized in that: The radio frequency system further includes a third filter; The first antenna port is connected to the first common antenna port through the third filter.

16. The radio frequency system according to claim 13, characterized in that The radio frequency system further includes a third filter and a fourth switch; The fourth switch includes a tenth terminal, an eleventh terminal and a twelfth terminal; The antenna port of the radio frequency circuit includes a first antenna port and a second antenna port; The first antenna port is connected to the tenth terminal of the fourth switch through the third filter, The second antenna port is connected to the eleventh terminal of the fourth switch; The twelfth terminal of the fourth switch is connected to the common antenna port of the radio frequency system.

17. The radio frequency system according to claim 13, wherein: The radio frequency system further includes a fourth switch, the fourth switch including a tenth terminal, an eleventh terminal, and a twelfth terminal; The radio frequency circuit includes a first filter, and the antenna port of the radio frequency circuit includes a first antenna port and a second antenna port; The first antenna port is connected to the tenth terminal of the fourth switch; The second antenna port is connected to the eleventh terminal of the fourth switch; The twelfth terminal of the fourth switch is connected to the common antenna port of the radio frequency system.

18. A communication device, characterized in that: The communication device comprises an antenna and a radio frequency system according to any one of claims 13 to 17; The antenna is connected to a common antenna port of the radio frequency system.

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