Radio frequency circuit, radio frequency system and communication device

Abstract

Provided in the embodiments of the present application are a radio frequency circuit, a radio frequency system and a communication device. When arranged in a radio frequency system, the radio frequency circuit can be adapted to a baseband chip in the radio frequency system that supports the reception of baseband received signals of different frequency bands and the output of baseband transmitted signals of different frequency bands. 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 antenna ports. 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 to an input end of the power amplification circuit, and the receiving port of the radio frequency circuit is connected to an output end of the low-noise amplification circuit. An output end of the power amplification circuit is connected to the first end of the first switch, and an input end of the low-noise amplification 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 ports of the radio frequency circuit.

Description

RF circuits, RF systems and communication equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on February 2, 2024, with application number 202410162416.7 and application name “RF Circuit, RF System and Communication Equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] 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

[0003] In a wireless communication system, communication equipment includes site equipment and access point equipment, where communication can be carried out between site equipment and access point equipment, site equipment and site equipment, and access point equipment and access point equipment. Specifically, the site equipment is equipped with a radio frequency system, and the access point equipment is also provided with a radio frequency system. The radio frequency system is used to receive radio frequency receiving signals or output radio frequency transmitting signals to achieve communication.

[0004] Among them, the radio frequency system includes baseband chips and radio frequency circuits. When the radio frequency system receives the radio frequency reception signal, the radio frequency circuit receives the radio frequency reception signal and outputs the baseband reception signal to the baseband chip according to the radio frequency reception signal; the baseband chip analyzes and transmits data according to the baseband reception signal. When the radio frequency system outputs a radio frequency transmission signal, the baseband chip outputs a baseband transmission signal to the radio frequency circuit according to the transmission data; the radio frequency circuit outputs a radio frequency transmission signal according to the baseband transmission signal.

[0005] 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.

[0006] Summary of the Invention

[0007] 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.

[0008] 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 end, a second end, a third end, and a fourth end. The transmit port of the radio frequency circuit is connected to the input of the power amplifier circuit, and the receive port of the radio frequency circuit is connected to the output of the low-noise amplifier circuit. The output of the power amplifier circuit is connected to the first end of the first switch; the input of the low-noise amplifier circuit is connected to the second end of the first switch. The third and fourth ends of the first switch are respectively connected to the antenna port of the radio frequency circuit. In this radio frequency circuit, because the first switch is provided, the first switch includes a third end and a fourth end, and the third and fourth ends of the first switch are respectively connected to the antenna port of the radio frequency circuit. Therefore, when the radio frequency circuit is provided in a radio frequency system, it can be compatible with 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.

[0009] Optionally, 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 RF circuit; and the fourth end of the first switch is connected to the second antenna port of the RF circuit. In this optional configuration, the RF circuit can choose to output RF transmit signals from the first antenna port or the second antenna port, or can choose to receive RF receive signals from the first antenna port or the second antenna port, thereby increasing the flexibility of the RF circuit.

[0010] Optionally, the first switch is configured to connect the first terminal to 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 RF transmit signal to the first antenna port based on the first baseband transmit signal. Alternatively, the first switch is configured to connect the first terminal to 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 RF transmit signal to the second antenna port based on the second baseband transmit signal. Alternatively, the first switch is configured to connect the second terminal to the third terminal; the low-noise amplifier circuit is configured to receive a first RF receive signal input through the first antenna port and output the first baseband receive signal to the receive port based on the first RF receive signal. Alternatively, the first switch is configured to connect the second terminal to the fourth terminal; the low-noise amplifier circuit is configured to receive a second RF receive signal input through the second antenna port and output a second baseband receive signal to the receive port based on the second RF receive signal.

[0011] Optionally, the antenna port further includes at least one third antenna port; the first switch further includes at least one fifth terminal; and one fifth terminal of the first switch is connected to a corresponding third antenna port of the RF circuit. In this optional embodiment, the RF circuit can choose to output RF transmit signals from the first antenna port, the second antenna port, or any third antenna port, and can also choose to receive RF receive signals from the first antenna port, the second antenna port, or any third antenna port, further enhancing the flexibility of the RF circuit.

[0012] Optionally, the first switch is configured to connect the first terminal to a fifth 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 third antenna port based on the third baseband transmit signal. Alternatively, the first switch is configured to connect the second terminal to a fifth terminal; the low-noise amplifier circuit is configured to receive a third RF receive signal input through the corresponding third antenna port and output a third baseband receive signal to the receive port based on the third RF receive signal.

[0013] Optionally, the RF circuit further includes: a first filter; and the third end of the first switch is connected to the first antenna port of the RF circuit via the first filter. In this optional embodiment, the filter is also integrated into the RF circuit to achieve a higher level of integration of the RF circuit.

[0014] Optionally, the RF circuit also includes: at least one second filter; the antenna port also includes at least one third antenna port; the first switch also includes at least one fifth end; a fifth end of the first switch is correspondingly connected to a third antenna port of the RF circuit through a second filter.

[0015] Optionally, the RF circuit also 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; and the eighth terminal of the second switch is connected to the antenna port of the RF circuit. In this optional embodiment, the RF circuit may include the first filter and the second switch, and include an antenna port, so that the RF circuit is more integrated. In addition, when the RF circuit outputs an RF transmit signal or receives an RF receive signal, the signal transmission path only includes two switches, the first switch and the second switch, which can reduce the insertion loss of the RF circuit.

[0016] Optionally, the first switch is configured to connect the first terminal to the third terminal; the second switch is configured to connect the eighth terminal to 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 RF transmit signal to the first filter based on the first baseband transmit signal; and the first filter is configured to output the filtered first RF transmit signal to the antenna port. Alternatively, the first switch is configured to connect the first terminal to the fourth terminal; the second switch is configured to connect the eighth terminal to 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 RF transmit signal to the antenna port based on the second baseband transmit signal. Alternatively, the first switch is configured to connect the second terminal to the third terminal; the second switch is configured to connect the eighth terminal to the sixth terminal; the first filter is configured to receive a first RF receive signal input through the antenna port and output the filtered first RF receive signal to the low-noise amplifier circuit; and the low-noise amplifier circuit is configured to output the first baseband receive signal to the receive port based on the first RF receive signal. Alternatively, the first switch is configured to connect the second end to the fourth end; the second switch is configured to connect the eighth end to the seventh end; and the low-noise amplifier circuit is configured to receive a second RF receive signal input through the antenna port and output a second baseband receive signal to the receive port based on the second RF receive signal.

[0017] Optionally, the RF 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; a fifth terminal of the first switch is correspondingly connected to a ninth terminal of the second switch through a second filter.

[0018] Optionally, the first switch is configured to connect the first terminal to a fifth terminal; the second switch is configured to connect the eighth terminal to a 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 based on the third baseband transmit signal; the corresponding second filter is configured to output the filtered third RF transmit signal to the antenna port. Alternatively, the first switch is configured to connect the second terminal to a fifth terminal; the second switch is configured to connect the eighth terminal to the corresponding ninth terminal; the corresponding second filter is configured to receive a third RF receive signal input through the antenna port, and output the filtered third RF receive signal to the low-noise amplifier circuit; the low-noise amplifier circuit is configured to output the third baseband receive signal to the receive port based on the third RF receive signal.

[0019] Optionally, 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 and the output end of the low-noise amplifier circuit; and the low-noise amplifier is connected between the input end and the output end of the low-noise amplifier circuit.

[0020] 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 according to any one of the first aspects; the radio frequency system also includes a common antenna port; the baseband chip is connected to the transmit port and receive port of the radio frequency circuit; and the common antenna port of the radio frequency system is connected to the antenna port of the radio frequency circuit.

[0021] Optionally, the common antenna port of the RF system includes a first common antenna port and a second common antenna port; the antenna port of the RF 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.

[0022] 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.

[0023] Optionally, the RF system also 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 RF 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 RF system.

[0024] Optionally, the RF system also includes a fourth switch, the fourth switch includes a tenth terminal, an eleventh terminal and a twelfth terminal; the RF circuit includes a first filter, and the antenna port of the RF 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; and the twelfth terminal of the fourth switch is connected to the common antenna port of the RF system.

[0025] In a third aspect, a communication device is provided, comprising an antenna and a radio frequency system as described in any one of the second aspects above; the antenna is connected to a common antenna port of the radio frequency system.

[0026] Among them, the technical effects brought about by any possible implementation method of the second to third aspects can refer to the technical effects brought about by the different implementation methods of the above-mentioned first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0028] FIG2 is a schematic diagram of the structure of a radio frequency system provided in an embodiment of the present application;

[0029] FIG3 is a schematic diagram of the structure of a radio frequency circuit provided in an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of a radio frequency system provided in another embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of a radio frequency circuit provided in yet another embodiment of the present application;

[0032] FIG6 is a schematic structural diagram of a radio frequency circuit provided in yet another embodiment of the present application;

[0033] FIG7 is a schematic structural diagram of a radio frequency circuit provided by another embodiment of the present application;

[0034] FIG8 is a schematic structural diagram of a radio frequency circuit provided in yet another embodiment of the present application;

[0035] FIG9 is a schematic structural diagram of a radio frequency circuit provided in yet another embodiment of the present application;

[0036] FIG10 is a schematic structural diagram of a radio frequency circuit provided by another embodiment of the present application;

[0037] FIG11 is a schematic structural diagram of a radio frequency circuit provided in yet another embodiment of the present application;

[0038] FIG12 is a first structural diagram of a first switch in a radio frequency circuit according to an embodiment of the present application;

[0039] FIG13 is a second structural diagram of a first switch in a radio frequency circuit according to an embodiment of the present application;

[0040] FIG14 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application;

[0041] FIG15 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0042] FIG16 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application;

[0043] FIG17 is a schematic structural diagram of a radio frequency system provided by another embodiment of the present application;

[0044] FIG18 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application;

[0045] FIG19 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application;

[0046] FIG20 is a schematic structural diagram of a radio frequency system provided in another embodiment of the present application;

[0047] FIG21 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application;

[0048] FIG22 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application;

[0049] FIG23 is a schematic structural diagram of a radio frequency system provided by another embodiment of the present application;

[0050] FIG24 is a schematic structural diagram of a radio frequency system provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0051] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0052] Unless otherwise defined, all scientific and technological terms used herein have the same meaning as those known to those of ordinary skill in the art. In the embodiments of the present application, "at least one" refers to one or more, and "a plurality" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, wherein A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or its similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can represent: a, b, c, a and b, a and c, b and c or a, b and c, wherein a, b and c can be single or multiple. In addition, in the embodiments of the present application, words such as "first" and "second" do not limit quantity and order.

[0053] In addition, in the embodiments of the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0054] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being more preferred or advantageous than other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0055] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0056] The following describes in detail the implementation of the embodiments of the present application in conjunction with the accompanying drawings.

[0057] Referring to Figure 1, Figure 1 is a structural diagram of a communication system provided in an embodiment of the present application. The communication system includes communication devices, and the communication devices may be, for example, the access point device (station) STA1, the access point device STA2, the station device (access point) AP1, and the station device AP2 shown in Figure 1, wherein the access point device STA1 can communicate with one or more of the access point device STA2, the station device AP1, and the station device AP2, the access point device STA2 can communicate with one or more of the access point device STA1, the station device AP1, and the station device AP2, the station device AP1 can communicate with one or more of the access point device STA1, the access point device STA2, and the station device AP2, and the station device AP2 can communicate with one or more of the access point device STA1, the access point device STA2, and the station device AP1.

[0058] For example, the communication between the communication devices in the communication system shown in FIG1 complies with the requirements of wireless local area networks (WLANs) of the relevant standards of the Institute of Electrical and Electronics Engineers (IEEE). The relevant IEEE standards include, but are not limited to, 802.11a / b / g, 802.11n, 802.11ac, 802.11ax, 802.11be, 802.11bn, UHR, and WiFi8 standards, 802.11ad, 802.11ay, 802.11bf, sensing standards, UWB, and 802.15 standards.

[0059] Exemplarily, the site device AP1 and / or the site device AP2 may be a device supporting multiple WLAN standards such as the 802.11be standard or future Wi-Fi standards; or may be a device supporting the 802.11a / b / g standard, 802.11n standard, 802.11ac standard, 802.11ax standard, 802.11be standard, 802.11bn standard / UHR standard / WiFi8 standard, without limitation.

[0060] For example, site device AP1 and / or site device AP2 can be a terminal device equipped with a Wi-Fi chip, a network device, a communication server, a router, a switch, a bridge, a computer, etc. Site device AP1 and / or site device AP2 can also serve as access points for mobile users to access wired networks. They are primarily deployed in homes, buildings, and campuses, with a typical coverage radius of tens to hundreds of meters. They can also be deployed outdoors. Site device AP1 and / or site device AP2 act as a bridge between wired and wireless networks, primarily connecting wireless network clients together and then connecting the wireless network to Ethernet.

[0061] Exemplarily, the access point device STA1 and / or the access point device STA2 can be a device that supports multiple WLAN standards such as the 802.11be standard or future Wi-Fi standards; it can also be a device that supports the 802.11a / b / g standard, 802.11n standard, 802.11ac standard, 802.11ax standard, 802.11be standard, 802.11bn standard / UHR standard / WiFi8 standard, without limitation.

[0062] For example, the access point device STA1 and / or the access point device STA2 may be a wireless communication chip, a wireless sensor, a wireless communication terminal, a communication server, a router, a switch, a network bridge, a computer, etc. For example, the access point device STA1 and / or the access point device STA2 may 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, an in-vehicle communication device supporting Wi-Fi communication function, a computer supporting Wi-Fi communication function, etc., without limitation.

[0063] Specifically, the above-mentioned communication device is provided with a radio frequency system, and the radio frequency system is used to receive radio frequency receiving signals or output radio frequency transmitting signals to realize communication between the communication device and other communication devices.

[0064] 2 , 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 transmit port and receive port of the radio frequency circuit 12. For example, when the radio frequency system 10 receives a radio frequency receive signal, the radio frequency circuit 12 receives the radio frequency receive signal and outputs a baseband receive signal to the baseband chip 11 based on the radio frequency receive signal. The baseband chip 11 receives the baseband receive signal and parses the transmission data based on the baseband receive signal. When the radio frequency system 10 outputs a radio frequency transmit signal, the baseband chip 11 outputs a baseband transmit signal to the radio frequency circuit 12 based on the transmission data. The radio frequency circuit 12 outputs a radio frequency transmit signal based on the baseband transmit signal.

[0065] For example, as shown in FIG3 , the RF circuit 12 includes a power amplifier circuit 121, a switch 122, and a low-noise amplifier circuit 123, wherein the RF circuit 12 includes a transmitting port, a receiving port, and an antenna port. Specifically, the transmitting port of the RF 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 RF 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 receiving port of the RF circuit 12.

[0066] Specifically, when the RF circuit 12 receives an RF receive signal, specifically, when the RF receive signal is input from the antenna port of the RF circuit 12, the switch 122 is configured to connect terminal a of the switch 122 to terminal c of the switch 122, thereby transmitting the RF receive signal to the low-noise amplifier circuit 123. The low-noise amplifier circuit 123 is configured to output a baseband receive signal to the receive port of the RF circuit 12 based on the RF receive signal. When the RF circuit 12 outputs an RF transmit signal, the switch 122 is configured to connect terminal a of the switch 122 to terminal b of the switch 122. The power amplifier circuit 121 is configured to receive the baseband transmit signal input through the transmit port of the RF circuit 12 and output the RF transmit signal to the antenna port of the RF circuit based on the baseband transmit signal.

[0067] For example, with the development of baseband chips 11 and wireless local area networks, most baseband chips 11 can currently support receiving baseband receive signals of different frequency bands and output baseband transmit signals of different frequency bands. Then, when the baseband chip 11 is set in the radio frequency system 10, it is necessary to set a plurality of radio frequency circuits 12 in the radio frequency system 10 to connect with the baseband chip 11. Referring to Figure 4, a plurality of radio frequency circuits 12 (such as the radio frequency circuit 12-1 and the radio frequency circuit 12-2 shown in Figure 4) are provided in the radio frequency system 10, and one radio frequency circuit 12 is used to receive a baseband receive signal of a frequency band and output a baseband transmit signal of the frequency band. In this scenario, in order to ensure that there is no interference between signals of different frequency bands, a filter 13 (such as the filter 13-1 and the filter 13-2 shown in Figure 4) will also be provided in the radio frequency system 10 shown in Figure 4, and one radio frequency circuit 12 is connected to one filter 13.

[0068] Specifically, as shown in FIG4 , the baseband chip 11 supports receiving baseband receive signals in a first frequency band and outputting baseband transmit signals in a first frequency band, and / or the baseband chip 11 supports receiving baseband receive signals in a second frequency band and outputting baseband transmit signals in a second frequency band. In FIG4 , the RF system 10 further includes a switch 14-1, a switch 14-2, a switch 14-3, and a switch 14-4. The RF 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. The baseband chip 11 is connected to the transmit port and the receive port of the RF circuit 12-1. The antenna port of the RF 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 RF system 10. The baseband chip 11 is connected to the transmitting port and receiving port of the RF circuit 12-2, the antenna port of the RF 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, and the a-end of the switch 14-4 is connected to the second common antenna port of the RF system 10.

[0069] The radio frequency system 10 shown in FIG4 includes the following three operating modes:

[0070] In operating mode 1 of the RF system 10 shown in FIG4 , the baseband chip 11 is configured to receive RF receive signals in the first frequency band and output RF transmit signals in the first frequency band. The switch 14-1 is configured to connect terminal a of the switch 14-1 to terminal b of the switch 14-1, and the switch 14-2 is configured to connect terminal b of the switch 14-2 to terminal a of the switch 14-2. The switch 14-3 is configured to connect terminal a of the switch 14-3 to terminal b of the switch 14-3, and the switch 14-4 is configured to connect terminal b of the switch 14-4 to terminal a of the switch 14-4.

[0071] When the RF system 10 receives the RF receive signal of the first frequency band, the first RF receive signal of 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 the switch 14-2 and the switch 14-1; the RF circuit 12-1 is configured to output the first baseband receive signal of the first frequency band to the receive port of the RF circuit 12-1 according to the first RF receive signal of the first frequency band; the baseband chip 11 is configured to receive the first baseband receive signal of the first frequency band and parse the first transmission data according to the first baseband receive signal of the first frequency band. The second channel of the first frequency band RF receiving signal is input through the second common antenna port of the RF system 10 and transmitted to the RF circuit 12-2 through the switch 14-4 and the switch 14-3; the RF circuit 12-2 is configured to output the second channel of the first frequency band baseband receiving signal to the receiving port of the RF circuit 12-2 according to the second channel of the first frequency band RF receiving signal; the baseband chip 11 is configured to receive the second channel of the first frequency band baseband receiving signal and parse the second channel of transmission data according to the second channel of the first frequency band baseband receiving signal.

[0072] When the RF system 10 outputs a RF transmit signal in the first frequency band, the baseband chip 11 can generate a first baseband transmit signal in the first frequency band and a second baseband transmit signal in the first frequency band. The RF circuit 12-1 receives the first baseband transmit signal in the first frequency band through a transmit port, and outputs the first RF transmit signal in the first frequency band to the antenna port of the RF circuit 12-1 based on the first baseband transmit signal in the first frequency band. The first RF transmit signal in the first frequency band passes through switches 14-1 and 14-2 and is then output from the first common antenna port of the RF system 10. The RF circuit 12-2 receives the second baseband transmit signal in the first frequency band through a transmit port, and outputs the second RF transmit signal in the first frequency band to the antenna port of the RF circuit 12-1 based on the second baseband transmit signal in the first frequency band. The second RF transmit signal in the first frequency band passes through switches 14-3 and 14-4 and is then output from the second common antenna port of the RF system 10.

[0073] In working mode 2 of the RF system 10 shown in FIG4 , the baseband chip 11 is configured to receive a baseband receive signal in a second frequency band and output a baseband transmit signal in a second frequency band. The configurations of the switches 14 - 1 , 14 - 2 , 14 - 3 , and 14 - 4 are the same as those in the above-mentioned example 1 and are not described in detail here.

[0074] In operating mode 3 of the RF system 10 shown in FIG4 , the baseband chip 11 is configured to receive baseband receive signals in a first frequency band and output baseband transmit signals in the first frequency band, and to receive baseband receive signals in a second frequency band and output baseband transmit signals in the second frequency band. Switch 14-1 is configured to connect terminal a of switch 14-1 to terminal c of switch 14-1, and switch 14-2 is configured to connect terminal c of switch 14-2 to terminal a of switch 14-2. Switch 14-3 is configured to connect terminal a of switch 14-3 to terminal c of switch 14-3, and switch 14-4 is configured to connect terminal c of switch 14-4 to terminal a of switch 14-4.

[0075] When the RF system 10 receives an RF receive signal in the first frequency band, the RF receive signal in the first frequency band is input through the first common antenna port of the RF system 10 and transmitted to the filter 13-1 via the switch 14-2. The filter 13-1 transmits the filtered RF receive signal in the first frequency band to the RF circuit 12-1 via the switch 14-1. The RF circuit 12-1 is configured to output a baseband receive signal in the first frequency band to the receive port of the RF circuit 12-1 based on the RF receive signal in the first frequency band. The baseband chip 11 is configured to receive the baseband receive signal in the first frequency band and parse the transmission data based on the baseband receive signal in the first frequency band. When the RF system 10 outputs an RF transmit signal in the first frequency band, the baseband chip 11 can generate a baseband transmit signal in the first frequency band. The RF circuit 12-1 receives a baseband transmit signal of the first frequency band through a transmit port, and outputs a RF transmit signal of the first frequency band to the antenna port of the RF circuit 12-1 according to the baseband transmit signal of the first frequency band. The RF transmit signal of the first frequency band is transmitted to the filter 13-1 through the switch 14-1; the filter 13-1 outputs the filtered RF transmit signal of the first frequency band from the first common antenna port of the RF system 10 through the switch 14-2.

[0076] When the RF system 10 receives an RF receive signal in the second frequency band, the RF receive 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 via the switch 14-4. The filter 13-2 transmits the filtered RF receive signal in the second frequency band to the RF circuit 12-2 via the switch 14-3. The RF circuit 12-2 is configured to output a baseband receive signal in the second frequency band to the receive port of the RF circuit 12-2 based on the RF receive signal in the second frequency band. The baseband chip 11 is configured to receive the baseband receive signal in the second frequency band and parse the transmission data based on the baseband receive signal in the second frequency band. When the RF system 10 outputs an RF transmit signal in the second frequency band, the baseband chip 11 can generate a baseband transmit signal in the second frequency band. The RF circuit 12-2 receives the baseband transmission signal of the second frequency band through the transmitting port, and outputs the RF transmission signal of the second frequency band to the antenna port of the RF circuit 12-2 according to the baseband transmission signal of the second frequency band. The RF transmission signal of the second frequency band is transmitted to the filter 13-2 through the switch 14-3; the filter 13-2 outputs the filtered RF reception signal of the second frequency band from the second common antenna port of the RF system 10 through the switch 14-4.

[0077] When the RF circuit 12 shown in FIG3 is provided in the RF system shown in FIG4 , the transmission of any one of the RF transmit signal of the first frequency band, the RF transmit signal of the second frequency band, the RF receive signal of the first frequency band, and the RF receive signal of the second frequency band needs to pass through three switches. The three switches are connected in series. The insertion loss of the RF system 10 is the sum of the insertion losses of the three switches, which makes the insertion loss of the RF system 10 shown in FIG4 relatively large.

[0078] To this end, an embodiment of the present application provides a radio frequency circuit that can be well adapted to the baseband chip in the radio frequency system 10 shown in FIG4 .

[0079] Specifically, as shown in Figures 5 to 11, an embodiment of the present application provides a structural schematic diagram of a radio frequency circuit 20, which includes: a power amplifier circuit 21, a low-noise amplifier circuit 23, and a switch 22 (also referred to as a first switch); wherein the radio frequency circuit 20 includes a transmitting port, a receiving 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).

[0080] Among them, the transmitting port of the RF circuit 20 is connected to the input end of the power amplifier circuit 21; the receiving port of the RF 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 port of the RF circuit 20.

[0081] In the RF circuit 20, a switch 22 is provided, and the switch 22 includes an h terminal and a k terminal. The h terminal and the k terminal of the switch 22 are respectively connected to the antenna port of the RF circuit, so that when the RF circuit 20 is set in the RF system, it can be adapted to the baseband chip in the RF system that supports receiving baseband receive signals of different frequency bands and outputting baseband transmit signals of different frequency bands.

[0082] Specifically, as shown in Figure 5, the antenna port includes antenna port 1 (also called the first antenna port) and antenna port 2 (also called the second antenna port), the j end of the switch 22 is connected to the antenna port 1 of the RF circuit 20; the k end of the switch 22 is connected to the antenna port 2 of the RF circuit 20.

[0083] The radio frequency circuit 20 shown in FIG5 includes the following working states:

[0084] Working state 1: the switch 22 is configured to connect the h terminal and the j terminal; the power amplifier circuit 21 is configured to receive the first baseband transmission signal input through the transmission port, and output the first RF transmission signal to the antenna port 1 according to the first baseband transmission signal.

[0085] Working state 2: The switch 22 is configured to connect the h terminal and the k terminal; the power amplifier circuit 21 is configured to receive the second baseband transmission signal input through the transmission port and output the second RF transmission signal to the antenna port 2 according to the second baseband transmission signal.

[0086] Working state 3: The switch 22 is configured to connect the i terminal and the j terminal; the low-noise amplifier circuit 23 is configured to receive the first RF receiving signal input through the antenna port 1, and output the first baseband receiving signal to the receiving port according to the first RF receiving signal.

[0087] Working state 4: the switch 22 is configured to connect the i terminal and the k terminal; the low-noise amplifier circuit 23 is configured to receive the second RF receiving signal input through the antenna port 2, and output the second baseband receiving signal to the receiving port according to the second RF receiving signal.

[0088] In a time period, the RF circuit 20 executes one of the working state 1 , the working state 2 , the working state 3 , and the working state 4 .

[0089] Exemplarily, as shown in Figure 5, the low-noise amplifier circuit 23 includes a low-noise amplifier 231, an attenuator 232 and a switch S1 (also called a third switch); the attenuator 232 and the switch S1 are connected in series between the input end of the low-noise amplifier circuit 23 and the output end of the low-noise amplifier circuit 23; the low-noise amplifier 231 is connected between the input end of the low-noise amplifier circuit 23 and the output end of the low-noise amplifier circuit 23.

[0090] The working state 3 of the radio frequency circuit 20 shown in FIG5 includes:

[0091] Working state 31: switch 22 is configured to connect terminal i and terminal j; switch S1 is configured to be open; low-noise amplifier circuit 23 is configured to receive a first RF receive signal input through antenna port 1, and low-noise amplifier 231 amplifies the first RF receive signal to generate a first baseband receive signal.

[0092] Working state 32: switch 22 is configured to connect terminal i and terminal j; switch S1 is configured to be closed; low-noise amplifier circuit 23 is configured to receive a first RF receive signal input through antenna port 1, and attenuator 232 attenuates the first RF receive signal to generate a first baseband receive signal.

[0093] The working state 4 of the radio frequency circuit 20 shown in FIG5 includes:

[0094] Working state 41: switch 22 is configured to connect terminal i and terminal k; switch S1 is configured to be open; low-noise amplifier circuit 23 is configured to receive a second RF receive signal input through antenna port 2, and low-noise amplifier 231 amplifies the second RF receive signal to generate a second baseband receive signal.

[0095] Working state 42: switch 22 is configured to connect terminal i and terminal k; switch S1 is configured to be closed; low-noise amplifier circuit 23 is configured to receive a second RF receive signal input through antenna port 2, and attenuator 232 attenuates the second RF receive signal to generate a second baseband receive signal.

[0096] For example, when the switch S1 shown in FIG5 is configured to be closed, the baseband chip 31 does not provide a power supply voltage to the low-noise amplifier 231. The low-noise amplifier 231 is equivalent to a larger attenuator, and the attenuation of the low-noise amplifier 231 is much greater than the attenuation of the attenuator 232. Therefore, it can also be considered that the signal between the input and output ends of the low-noise amplifier circuit 23 is transmitted through the attenuator 232.

[0097] In other embodiments, the switch S1 may also be a single-pole double-throw switch, and the switch S1 is used to switch between the input and output ends of the low-noise amplifier circuit 23 through the attenuator 232 or the low-noise amplifier 231 .

[0098] For example, as shown in Figure 6, based on the RF circuit 20 shown in Figure 5, the antenna port of the RF circuit 20 shown in Figure 6 also includes an antenna port 31 (also called the third antenna terminal); the switch 22 also includes a q1 terminal (also called the fifth terminal of the switch 22); the q1 terminal of the switch 22 is correspondingly connected to the antenna port 31 of the RF circuit 20.

[0099] The working state of the radio frequency circuit 20 shown in FIG6 includes not only the working state of the radio frequency circuit 20 shown in FIG5 , but also the following working states:

[0100] Working state 5: The switch 22 is configured to connect 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, amplify the third baseband transmission signal and output the third RF transmission signal to the antenna port 31.

[0101] Working state 6: the switch 22 is configured to connect the i terminal and the q1 terminal; the low-noise amplifier circuit 23 is configured to receive the third RF receiving signal input through the antenna port 31, and output the third baseband receiving signal to the receiving port according to the third RF receiving signal.

[0102] The structure of the low-noise amplifier circuit 23 shown in FIG6 is the same as that of the low-noise amplifier circuit 23 shown in FIG5 , so the above-mentioned working state 6 includes:

[0103] Working state 61: switch 22 is configured to connect terminal i and terminal q1; switch S1 is configured to be open; low-noise amplifier circuit 23 is configured to receive a third RF receive signal input through antenna port 31, and low-noise amplifier 231 amplifies the third RF receive signal to generate a third baseband receive signal.

[0104] Working state 62: switch 22 is configured to connect terminal i and terminal q1; switch S1 is configured to be closed; low-noise amplifier circuit 23 is configured to receive a third RF receive signal input through antenna port 31, and attenuator 232 attenuates the third RF receive signal to generate a third baseband receive signal.

[0105] For example, as shown in Figure 7, based on the RF circuit 20 shown in Figure 6, the antenna port of the RF circuit 20 shown in Figure 7 also includes an antenna port 32 (also called a third antenna terminal); the switch 22 also includes a q2 terminal (also called the fifth terminal of the switch 22); the q2 terminal of the switch 22 is correspondingly connected to the antenna port 32 of the RF circuit 20.

[0106] The working state of the radio frequency circuit 20 shown in FIG7 includes not only the working state of the radio frequency circuit 20 shown in FIG6 , but also the following working states:

[0107] Working state 7: The switch 22 is configured to connect 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, amplify the third baseband transmission signal and output the third RF transmission signal to the antenna port 32.

[0108] Working state 8: The switch 22 is configured to connect the i terminal and the q3 terminal; the low-noise amplifier circuit 23 is configured to receive the third RF receiving signal input through the antenna port 32, and output the third baseband receiving signal to the receiving port according to the third RF receiving signal.

[0109] The structure of the low-noise amplifier circuit 23 shown in FIG7 is the same as that of the low-noise amplifier circuit 23 shown in FIG6 , so the above-mentioned working state 8 includes:

[0110] Working state 81: switch 22 is configured to connect terminal i and terminal q2; switch S1 is configured to be open; low-noise amplifier circuit 23 is configured to receive a third RF receive signal input through antenna port 32, and low-noise amplifier 231 amplifies the third RF receive signal to generate a third baseband receive signal.

[0111] Working state 82: switch 22 is configured to connect terminal i and terminal q2; switch S1 is configured to be closed; low-noise amplifier circuit 23 is configured to receive a third RF receive signal input through antenna port 32, and attenuator 232 attenuates the third RF receive signal to generate a third baseband receive signal.

[0112] For example, in the RF circuit 20 shown in FIG7 , the antenna port of the RF circuit 20 may further include multiple third antenna terminals; the switch 22 may further include multiple fifth terminals, which is not limited in the embodiments of the present application.

[0113] That is, the antenna port of the RF circuit 20 further includes at least one third antenna port; the switch 22 further includes at least one fifth terminal; and a fifth terminal of the switch 22 is connected to a corresponding third antenna port of the RF circuit 20. For example, the q1 terminal of the switch 22 is connected to the antenna port 31 of the RF circuit 20, and the q2 terminal of the switch 22 is connected to the antenna port 32 of the RF circuit 20.

[0114] Switch 22 is configured to connect terminal h to a fifth terminal. Power amplifier circuit 21 is configured to receive a third baseband transmit signal input through the transmit port, amplify the third baseband transmit signal, and output a third RF transmit signal to the corresponding third antenna port. Exemplarily, terminal h is connected to terminal q1, and the corresponding third antenna port is antenna port 31 connected to terminal q1. Terminal h is connected to terminal q2, and the corresponding third antenna port is antenna port 32 connected to terminal q2.

[0115] Alternatively, switch 22 is configured to connect terminal i to a fifth terminal; the low-noise amplifier circuit is configured to receive a third RF receive signal input through the corresponding third antenna port and output a third baseband receive signal to the receive port based on the third RF receive signal. Exemplarily, terminal i is connected to terminal q1, and the corresponding third antenna port is specifically antenna port 31 connected to terminal q1. Terminal i is connected to terminal q2, and the corresponding third antenna port is specifically antenna port 32 connected to terminal q2.

[0116] In another embodiment, as shown in Figure 8, compared with the RF circuit 20 shown in Figure 5, the RF circuit 20 shown in Figure 8 further includes: a filter 24 (also referred to as a first filter); the j end of the switch 22 is connected to the antenna port 1 of the RF circuit 20 through the filter 24.

[0117] The working state of the RF circuit 20 shown in FIG7 can refer to the working state of the RF circuit 20 shown in FIG5 . The difference is that in working state 1, the power amplifier circuit 21 is configured to receive the first baseband transmit signal input through the transmit port, and output the first RF transmit signal to the filter 24 based on the first baseband transmit signal. The filter 24 outputs the filtered first RF transmit signal to the antenna port 1. Specifically, the filter 24 can filter out the sideband interference signal of the first RF transmit signal. In working state 3, the filter 24 is configured to receive the first RF receive signal input through the antenna port 1, and output the filtered first RF receive signal to the low-noise amplifier circuit 23. Specifically, the filter 24 can filter out other signals with a frequency band different from that of the first RF receive signal. The low-noise amplifier circuit 23 is configured to output the first baseband receive signal to the receive port based on the first RF receive signal.

[0118] In addition, based on the RF circuit 20 shown in FIG8 , as shown in FIG9 , the RF circuit 20 further includes: at least one second filter (filter 251 and filter 252 as shown in FIG9 ); the antenna port further includes at least one third antenna port (antenna port 31 and antenna port 32 as shown in FIG8 ); the switch 22 further includes at least one fifth terminal (q1 terminal and q2 terminal as shown in FIG8 ); wherein a fifth terminal of the switch 22 is connected to a corresponding third antenna port of the RF circuit 20 through a second filter. Exemplarily, the q1 terminal of the switch 22 is connected to the antenna port 31 of the RF circuit 20 through the filter 251, and the q2 terminal of the switch 22 is connected to the antenna port 32 of the RF circuit 20 through the filter 252.

[0119] The embodiments of the present application do not limit the frequency ranges of the filter 24, the filter 251, and the filter 252 shown in FIG9 . In some cases, the frequency ranges of the filter 24, the filter 251, and the filter 252 may be frequency ranges of the 5G high frequency bands that conform to the Wi-Fi frequency band divisions of different countries.

[0120] Exemplarily, the frequency range of the filter 24 is the first frequency band, which means that the filter 24 will filter out all signals outside the first frequency band and output signals in the first frequency band.

[0121] Switch 22 is configured to connect terminal h to a fifth terminal. Power amplifier circuit 21 is configured to receive a third baseband transmit signal input through the transmit port, amplify the third baseband transmit signal, and output a third RF transmit signal to the corresponding second filter. The corresponding second filter is configured to output the filtered third RF transmit signal to the corresponding third antenna port. Exemplarily, terminal h is connected to terminal q1, the corresponding second filter is specifically filter 251 connected to terminal q1, and the corresponding third antenna port is specifically antenna port 31 connected to terminal q1. Terminal h is connected to terminal q2, the corresponding second filter is specifically filter 252 connected to terminal q2, and the corresponding third antenna port is specifically antenna port 32 connected to terminal q2.

[0122] Alternatively, switch 22 is configured to connect terminal i to a fifth terminal; the corresponding filter is configured to receive a third RF receive signal input through the corresponding third antenna port and output the filtered third RF receive signal to the low-noise amplifier circuit; the low-noise amplifier circuit is configured to output a third baseband receive signal to the receive port based on the third RF receive signal. Exemplarily, terminal i is connected to terminal q1, the corresponding second filter is specifically filter 251 connected to terminal q1, and the corresponding third antenna port is specifically antenna port 31 connected to terminal q1. Terminal i is connected to terminal q2, the corresponding second filter is specifically filter 252 connected to terminal q2, and the corresponding third antenna port is specifically antenna port 32 connected to terminal q2.

[0123] Specifically, the working state of the radio frequency circuit 20 shown in FIG9 can refer to the working state of the radio frequency circuit 20 shown in FIG7 . The difference is that:

[0124] In working state 1, the power amplifier circuit 21 is configured to receive a first baseband transmit signal input through the transmit port, output a first RF transmit signal to the filter 24 according to the first baseband transmit signal, and the filter 24 outputs the filtered first RF transmit signal to the antenna port 1.

[0125] In working state 3, the filter 24 is configured to receive the first RF receiving signal input through the antenna port 1, and output the filtered first RF receiving signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output the first baseband receiving signal to the receiving port according to the first RF receiving signal.

[0126] In working state 5, the power amplifier circuit 21 is configured to receive the third baseband transmit signal input through the transmit port, output the third RF transmit signal to the filter 251 according to the first baseband transmit signal, and the filter 251 outputs the filtered third RF transmit signal to the antenna port 31.

[0127] In working state 6, the filter 251 is configured to receive the third RF receiving signal input through the antenna port 31, and output the filtered third RF receiving signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output the third baseband receiving signal to the receiving port according to the third RF receiving signal.

[0128] In working state 7, the power amplifier circuit 21 is configured to receive the third baseband transmit signal input through the transmit port, output the third RF transmit signal to the filter 252 according to the first baseband transmit signal, and the filter 252 outputs the filtered third RF transmit signal to the antenna port 32.

[0129] In working state 8, the filter 252 is configured to receive the third RF receiving signal input through the antenna port 32, and output the filtered third RF receiving signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output the third baseband receiving signal to the receiving port according to the third RF receiving signal.

[0130] In other embodiments, as shown in FIG10 , the RF circuit 20 includes a power amplifier circuit 21, a low-noise amplifier circuit 23, and a switch 22. The RF circuit 20 includes a transmit port, a receive port, and an antenna port. The switch 22 includes terminals h, i, j, and k. The RF circuit 20 also includes a filter 24 (also referred to as a first filter) and a switch 26 (also referred to as a second switch). The switch 26 includes a terminal m (also referred to as the sixth terminal of the second switch), a terminal n (also referred to as the seventh terminal of the second switch), and a terminal r (also referred to as the eighth terminal of the second switch).

[0131] The transmit port of RF circuit 20 is connected to the input of power amplifier circuit 21; the receive port of RF circuit 20 is connected to the output of low-noise amplifier circuit 23; the output of power amplifier circuit 21 is connected to the h-terminal of switch 22; and the input of low-noise amplifier circuit 23 is connected to the i-terminal of switch 22. The j-terminal and k-terminal of switch 22 are respectively connected to the antenna port of RF circuit 20. Specifically, the j-terminal of switch 22 is connected to the m-terminal of switch 26 via filter 24; the k-terminal of switch 22 is connected to the m-terminal of switch 26; and the r-terminal of switch 26 is connected to the antenna port of RF circuit 20.

[0132] The RF circuit shown in FIG10 includes a filter 24 and a switch 26, and includes an antenna port, which increases the integration of the RF circuit 20. In addition, when the RF circuit 20 outputs a RF transmit signal or receives a RF receive signal, the signal transmission path only includes two switches, switch 22 and switch 26, which can reduce the insertion loss of the RF circuit 20.

[0133] Exemplarily, the RF circuit 20 shown in FIG10 includes the following working states:

[0134] Working state 1: Switch 22 is configured to connect terminal h to terminal j; switch 26 is configured to connect terminal r to terminal m; power amplifier circuit 21 is configured to receive a first baseband transmit signal input through the transmit port and output a first RF transmit signal to filter 24 based on the first baseband transmit signal; filter 24 is configured to output the filtered first RF transmit signal to the antenna port.

[0135] Working state 2: Switch 22 is configured to connect terminal h to terminal k; switch 26 is configured to connect terminal r to terminal n; power amplifier circuit 21 is configured to receive a second baseband transmit signal input through the transmit port and output a second RF transmit signal to the antenna port based on the second baseband transmit signal.

[0136] Working state 3: Switch 22 is configured to connect terminal i and terminal j; switch 26 is configured to connect terminal r and terminal m; filter 24 is configured to receive a first RF receive signal input through the antenna port and output the filtered first RF receive signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output a first baseband receive signal to the receive port based on the first RF receive signal.

[0137] Working state 4: switch 22 is configured to connect terminal i and terminal k; switch 26 is configured to connect terminal r and terminal n; low-noise amplifier circuit 23 is configured to receive a second RF receive signal input through the antenna port and output a second baseband receive signal to the receive port according to the second RF receive signal.

[0138] In some embodiments, compared to the RF circuit 20 shown in FIG10 , the RF circuit 20 shown in FIG11 further includes: at least one second filter (such as filter 251 and filter 252 shown in FIG11 ); the switch 22 further includes at least one fifth terminal (such as terminal q1 and terminal q2 shown in FIG11 ); and the switch 26 further includes at least one ninth terminal (such as terminal s1 and terminal s2 shown in FIG11 ); wherein a fifth terminal of the switch 22 is connected to a corresponding ninth terminal of the switch 26 via a second filter. For example, the q1 terminal of the switch 22 is connected to the s1 terminal of the switch 26 via the filter 251, and the q2 terminal of the switch 22 is connected to the s2 terminal of the switch 26 via the filter 252.

[0139] Switch 22 is configured to connect terminal h to a fifth terminal; switch 26 is configured to connect terminal r to a corresponding ninth terminal; power amplifier circuit 21 is configured to receive a third baseband transmit signal input through the transmit port and output a third RF transmit signal to a corresponding second filter based on the third baseband transmit signal; the corresponding second filter is configured to output the filtered third RF transmit signal to the antenna port. Exemplarily, terminal h is connected to terminal q1, the corresponding second filter is specifically filter 251 connected to terminal q1, and the corresponding ninth terminal is specifically terminal s1 connected to terminal q1. Terminal h is connected to terminal q2, the corresponding second filter is specifically filter 252 connected to terminal q2, and the corresponding ninth terminal is specifically terminal s2 connected to terminal q2.

[0140] Alternatively, switch 22 is configured to connect terminal i to a fifth terminal; switch 26 is configured to connect terminal r to a corresponding ninth terminal; the corresponding second filter is configured to receive a third RF receive signal input through the antenna port and output a filtered third RF receive signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output a third baseband receive signal to the receive port based on the third RF receive signal. Exemplarily, terminal i is connected to terminal q1, the corresponding second filter is specifically filter 251 connected to terminal q1, and the corresponding ninth terminal is specifically terminal s1 connected to terminal q1. Terminal i is connected to terminal q2, the corresponding second filter is specifically filter 252 connected to terminal q2, and the corresponding ninth terminal is specifically terminal s2 connected to terminal q2.

[0141] Specifically, the working state of the RF circuit 20 shown in FIG11 includes the working state of the RF circuit 20 shown in FIG10 , and also includes the following working states:

[0142] Working state 5: Switch 22 is configured to connect terminal h to terminal q1; switch 26 is configured to connect terminal r to terminal s1; power amplifier circuit 21 is configured to receive a third baseband transmit signal input through the transmit port and output a third RF transmit signal to filter 251 based on the third baseband transmit signal; filter 251 is configured to output the filtered third RF transmit signal to the antenna port.

[0143] Working state 6: Switch 22 is configured to connect terminal i to terminal q1; switch 26 is configured to connect terminal r to terminal s1; filter 251 is configured to receive a third RF receive signal input through the antenna port and output the filtered third RF receive signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output a third baseband receive signal to the receive port based on the third RF receive signal.

[0144] Working state 7: Switch 22 is configured to connect terminal h to terminal q2; switch 26 is configured to connect terminal r to terminal s2; power amplifier circuit 21 is configured to receive a third baseband transmit signal input through the transmit port, and output a third RF transmit signal to filter 252 based on the third baseband transmit signal; filter 252 is configured to output the filtered third RF transmit signal to the antenna port.

[0145] Working state 8: Switch 22 is configured to connect terminal i and terminal q2; switch 26 is configured to connect terminal r and terminal s2; filter 252 is configured to receive a third RF receive signal input through the antenna port and output the filtered third RF receive signal to the low-noise amplifier circuit 23; the low-noise amplifier circuit 23 is configured to output a third baseband receive signal to the receive port based on the third RF receive signal.

[0146] Among them, the switch 22 in the radio frequency circuit 20 shown in Figures 5, 8 and 10 is specifically a double-pole double-throw switch (double-pole double-throw, DPDT), and the principle structure diagram of the double-pole double-throw switch is shown in Figure 12, wherein the h end of the switch 22 corresponds to a metal contact, the i end of the switch 22 corresponds to a metal contact, the j end of the switch 22 corresponds to two metal contacts, and the k end of the switch 22 corresponds to two metal contacts, wherein the metal contact at the h end can be toggled to connect to the metal contact at the j end or to connect to the metal contact at the k end, and the metal contact at the i end can be toggled to connect to the metal contact at the j end or to connect to the metal contact at the k end.

[0147] For example, 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, as shown in FIG13 , the switch 22 shown in FIG12 is usually connected to form the structure shown in FIG13 . The principle is the same.

[0148] The switch 22 in the RF circuit 20 shown in FIG6 is specifically a double-pole triple-throw switch. The switch 22 in the RF circuit 20 shown in FIG7, FIG9, and FIG11 is specifically a double-pole four-throw switch. The switch 26 shown in FIG10 is specifically a single-pole double-throw (SPDT) switch. The switch 26 shown in FIG11 is specifically a single-pole four-throw switch.

[0149] Illustratively, an embodiment of the present application also provides a radio frequency system, referring to the radio frequency system 30 shown in any one of Figures 14 and 16 to 23, wherein the radio frequency system 30 includes a baseband chip 31 and at least one radio frequency circuit 20 as shown in any one of Figures 5 to 11; the radio frequency system 30 also 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.

[0150] Specifically, as shown in Figure 14, the common antenna port of the RF system 30 includes a common antenna port 1 (also referred to as a first common antenna port) and a common antenna port 2 (also referred to as a second common antenna port); wherein the RF circuit 20 can specifically be the RF circuit 20 shown in Figure 5, and the RF circuit 20 includes an antenna port 1 and an antenna port 2, and 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.

[0151] Illustratively, in the RF system 30, a control circuit is provided in the baseband chip 31, which is connected to the switch S1 and the switch 22 in the RF circuit 20. Specifically, when the RF system 30 needs to output an RF transmit signal through the common antenna port 1 of the RF system 30, the control circuit in the baseband chip 31 outputs a first control signal to the switch 22 to control the switch 22 to connect the h terminal and the j terminal of the switch 22 according to the first control signal, and controls the RF circuit 20 to execute working state 1. When the RF system 30 needs to output an RF transmit signal through the common antenna port 2 of the RF system 30, the control circuit in the baseband chip 31 outputs a second control signal to the switch 22 to control the switch 22 to connect the h terminal and the k terminal of the switch 22 according to the second control signal, and controls the RF circuit 20 to execute working state 2. When the RF system 30 needs to receive a RF receive signal input from the common antenna port 1, the control circuit in the baseband chip 31 outputs a third control signal to the switch 22 to control the switch 22 to connect terminals i and j according to the third control signal, and controls the RF circuit 20 to enter operating state 3. When the RF system 30 needs to receive a RF receive signal input from the common antenna port 2, the control circuit in the baseband chip 31 outputs a fourth control signal to the switch 22 to control the switch 22 to connect terminals i and k according to the fourth control signal, and controls the RF circuit 20 to enter operating state 4.

[0152] Illustratively, during a predetermined time period, the switch S1 in the RF circuit 20 is not turned on, and the control circuit in the baseband chip 31 outputs a third control signal or a fourth control signal to the switch 22. When the RF circuit 20 is controlled to execute working state 3 or working state 4, the baseband chip 31 can receive the baseband receive signal. After the baseband chip 31 determines that the power of the baseband receive signal is greater than the predetermined value, the control circuit in the baseband chip 31 outputs a receive control signal to the switch S1 to control the switch S1 to be turned on, thereby reducing the power of the baseband receive signal received by the baseband chip 31.

[0153] In some embodiments, the RF circuit 20 shown in FIG14 may also be the RF circuit 20 shown in FIG6 or FIG7. For example, when the RF circuit 20 is the RF circuit 20 shown in FIG6, since the RF circuit 20 includes three antenna ports, the RF system 30 also needs to include three common antenna ports, one antenna port is connected to one common antenna port, and the control circuit in the baseband chip 31 can be used to receive a RF receive signal or output a RF transmit signal from any one of the three common antenna ports. For example, when the RF circuit 20 is the RF circuit 20 shown in FIG7, since the RF circuit 20 includes four antenna ports, the RF system 30 also needs to include four common antenna ports, one antenna port is connected to one common antenna port, and the control circuit in the baseband chip 31 can be used to receive a RF receive signal or output a RF transmit signal from any one of the four common antenna ports.

[0154] Exemplarily, the RF system 30 shown in Figure 14 may also include M RF circuits 20, wherein one RF 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 RF circuits 20 include M×N antenna ports. Then the RF system 30 needs to include M×N public antenna ports, one antenna port is connected to one public antenna port correspondingly, and the control circuit in the baseband chip 31 can be used to receive RF receive signals or output RF transmit signals from any one of the M×N public antenna ports.

[0155] For example, as shown in Figure 15, an embodiment of the present application provides a structural diagram of a communication device 40, which includes an antenna (antenna 1 and antenna 2 as shown in Figure 15) and a radio frequency system 30 as shown in Figure 14, wherein the antenna is connected to the common antenna port of the radio frequency system 30. Specifically, the radio frequency system 30 shown in Figure 14 includes two common antenna ports, and the communication device 40 is provided with two antennas, antenna 1 is connected to the common antenna port 1, and antenna 2 is connected to the common antenna port 2.

[0156] When antenna 1 covers a first area, antenna 2 covers a 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:

[0157] In the first time period, the baseband chip 31 generates a baseband transmission signal, and the baseband chip 31 controls the RF circuit 20 to be in working state 1. The RF circuit 20 outputs the RF transmission signal to the antenna port 1. The RF transmission signal will be transmitted to the antenna 1 and radiated by the antenna 1 to the first area.

[0158] In the second time period, the baseband chip 31 generates a baseband transmission signal, and the baseband chip 31 controls the RF circuit 20 to be in working state 2. The RF circuit 20 then outputs the RF transmission signal to the antenna port 2. The RF transmission signal will be transmitted to the antenna 2 and radiated by the antenna 2 to the second area.

[0159] In the third time period, the baseband chip 31 controls the RF circuit 20 to be in working state 3, then the RF circuit 20 receives the RF receiving signal in the first area, outputs the baseband receiving signal to the receiving port, and the baseband chip 31 parses the transmission data in the first area according to the baseband receiving signal.

[0160] In the fourth time period, the baseband chip 31 controls the RF circuit 20 to be in working state 4, then the RF circuit 20 receives the RF receiving signal in the second area, outputs the baseband receiving signal to the receiving port, and the baseband chip 31 parses the transmission data in the second area according to the baseband receiving signal.

[0161] In other embodiments, referring to FIG16 , embodiments of the present application further provide a schematic structural diagram of a radio frequency system 30, wherein the common antenna port in the radio frequency system 30 shown in FIG16 includes common antenna port 1 and common antenna port 2, wherein the radio frequency circuit 20 in the radio frequency system 30 shown in FIG16 is specifically the radio frequency circuit 20 shown in FIG8 , and the radio frequency circuit 20 includes antenna port 1 and antenna port 2, antenna port 1 being connected to common antenna port 1, and antenna port 2 being connected to common antenna port 2. Furthermore, the control circuit in the baseband chip 31 can be used to receive a radio frequency receive signal or output a radio frequency transmit signal from any one of the two common antenna ports.

[0162] For example, when the baseband chip 31 can support multiple input and multiple output (MIMO), as shown in FIG17 , the RF system 30 shown in FIG17 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. The four RF circuits 20 are the RF circuits 20 shown in FIG8 . The RF system 30 includes eight public antenna ports. Antenna port 1 of RF circuit 20-1 is connected to public antenna port 1, and antenna port 2 is connected to public antenna port 2. Antenna port 1 of RF circuit 20-2 is connected to public antenna port 3, and antenna port 2 is connected to public antenna port 4. Antenna port 1 of RF circuit 20-3 is connected to public antenna port 5, and antenna port 2 is connected to public antenna port 6. Antenna port 1 of RF circuit 20-4 is connected to public antenna port 7, and antenna port 2 is connected to public antenna port 8.

[0163] The frequency range of the filter 24 in the RF circuit 20-1 and the filter 24 in the RF circuit 20-2 is a first frequency band, and the frequency range of the filter 24 in the RF circuit 20-3 and the filter 24 in the RF circuit 20-4 is a second frequency band. The RF system 30 can receive RF receive signals in the first frequency band and output RF transmit signals in the first frequency band, and / or receive RF receive signals in the second frequency band and output RF transmit signals in the second frequency band.

[0164] The radio frequency system 30 includes the following operating modes:

[0165] Working mode 1: the RF system 30 receives RF receive signals in the first frequency band and outputs RF transmit signals in the first frequency band.

[0166] When the RF system 30 outputs RF transmit 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. The baseband chip 31 generates four baseband transmit signals in the first frequency band. RF circuits 20-1, 20-2, 20-3, and 20-4 each receive one baseband transmit signal in the first frequency band and output one RF transmit signal in the first frequency band. The RF system 30 can ultimately output four RF transmit signals in the first frequency band from common antenna port 2, common antenna port 4, common antenna port 6, and common antenna port 8.

[0167] When the RF system 30 receives an RF receive 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 receive signals in the first frequency band from common antenna port 2, common antenna port 4, common antenna port 6, and common antenna port 8. RF circuit 20-1, RF circuit 20-2, RF circuit 20-3, and RF circuit 20-4 each receive one RF receive signal in the first frequency band and output one baseband receive signal in the first frequency band to the baseband chip 31. Ultimately, the baseband chip 31 can receive four baseband receive signals in the first frequency band.

[0168] Operating Mode 2: RF system 30 receives RF receive signals in the second frequency band and outputs RF transmit signals in the second frequency band. This operating mode is similar to Operating Mode 1, except that baseband chip 31 outputs four baseband transmit signals in the second frequency band and receives four baseband receive signals in the second frequency band. This description is omitted here.

[0169] Working mode 3: the RF system 30 receives RF receive signals in the first frequency band and outputs RF transmit signals in the first frequency band, and receives RF receive signals in the second frequency band and outputs RF transmit signals in the second frequency band.

[0170] In this working mode, the RF system 30 receives RF receive signals in the first frequency band and outputs RF transmit signals in the first frequency band, and the RF system receives RF receive signals in the second frequency band and outputs RF transmit signals in the second frequency band independently.

[0171] When RF system 30 outputs RF transmit signals in the first frequency band, baseband chip 31 controls RF circuit 20-1 to operate in operating state 1 and RF circuit 20-2 to operate in operating state 2. Baseband chip 31 generates two baseband transmit signals in the first frequency band. RF circuit 20-1 and RF circuit 20-2 each receive one baseband transmit signal in the first frequency band and output one RF transmit signal in the first frequency band. RF system 30 can ultimately output two RF transmit signals in the first frequency band from common antenna port 1 and common antenna port 3.

[0172] When the RF system 30 receives a RF receive signal in the first frequency 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. The RF system 30 can receive two RF receive signals in the first frequency band from the common antenna port 1 and the common antenna port 3. The RF circuit 20-1 and the RF circuit 20-2 each receive one RF receive signal in the first frequency band and output one baseband receive signal in the first frequency band to the baseband chip 31. The baseband chip 31 can ultimately receive two baseband receive signals in the first frequency band.

[0173] When RF system 30 outputs RF transmit signals in the second frequency band, baseband chip 31 controls RF circuit 20-3 and RF circuit 20-4 to operate in operating state 1 and 2. Baseband chip 31 generates two baseband transmit signals in the second frequency band. RF circuit 20-3 and RF circuit 20-4 each receive one baseband transmit signal in the second frequency band and output one RF transmit signal in the second frequency band. RF system 30 can ultimately output two RF transmit signals in the second frequency band from common antenna port 5 and common antenna port 7.

[0174] When the RF system 30 receives a RF receive signal in the second frequency 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. The RF system 30 can receive two RF receive signals in the second frequency band from the common antenna port 5 and the common antenna port 7. The RF circuit 20-3 and the RF circuit 20-4 each receive one RF receive signal in the second frequency band and output one baseband receive signal in the second frequency band to the baseband chip 31. The baseband chip 31 can ultimately receive two baseband receive signals in the second frequency band.

[0175] Exemplarily, the above-mentioned working mode 1 and working mode 2 are also referred to as the single-frequency working mode of the radio frequency system 10 , and the above-mentioned working mode 3 is also referred to as the dual-frequency working mode of the radio frequency system 30 .

[0176] In other embodiments, as shown in FIG18 , the RF system 30 shown in FIG18 supports three inputs and three outputs. The RF system 30 includes three RF circuits 20, namely, RF circuit 20-1, RF circuit 20-2, and RF circuit 20-3. Each RF circuit 20 includes antenna port 1, antenna port 2, and antenna port 3. The RF system 30 includes nine public antenna ports. Antenna port 1 of RF circuit 20-1 is connected to public antenna port 1, antenna port 2 is connected to public antenna port 2, and antenna port 3 is connected to public antenna port 3. Antenna port 1 of RF circuit 20-2 is connected to public antenna port 4, antenna port 2 is connected to public antenna port 5, and antenna port 3 is connected to public antenna port 6. Antenna port 1 of RF circuit 20-3 is connected to public antenna port 7, antenna port 2 is connected to public antenna port 8, and antenna port 3 is connected to public antenna port 9.

[0177] The frequency range of the filter 24 in the RF circuit 20-1 and the filter 24 in the RF circuit 20-3 is a first frequency band, the frequency range of the filter 251 in the RF circuit 20-1 and the filter 24 in the RF circuit 20-2 is a second frequency band, and the frequency range of the filter 251 in the RF circuit 20-2 and the filter 251 in the RF circuit 20-3 is a third frequency band. The RF system 30 can receive a RF receive signal in the first frequency band and output a RF transmit signal in the first frequency band, and / or receive a RF receive signal in the second frequency band and output a RF transmit signal in the second frequency band, and / or receive a RF receive signal in the third frequency band and output a RF transmit signal in the third frequency band.

[0178] The RF circuit 30 further includes a working state 6 (the h terminal of the switch 22 is connected to the q1 terminal) and a working state 7 (the i terminal of the switch 22 is connected to the q1 terminal).

[0179] The RF system 30 shown in FIG18 can operate in a single-frequency mode. To output RF transmit signals, the baseband chip 31 controls RF circuits 20-1, 20-2, and 20-3 to execute operating states 2. To receive RF receive signals, the baseband chip 31 controls RF circuits 20-1, 20-2, and 20-3 to execute operating states 4.

[0180] The RF system 30 shown in FIG18 can operate in a dual-band mode. The dual-band mode is a first frequency band and a second frequency band. In this mode, the baseband chip 31 always controls the switch 22 of the RF circuit 20-3 to be non-conductive. Outputting RF transmit signals in the first frequency band is the baseband chip 31 controlling the RF circuit 20-1 to execute operating state 1, and receiving RF receive signals in the first frequency band is the baseband chip 31 controlling the RF circuit 20-1 to execute operating state 3. Outputting RF transmit signals in the second frequency band is the baseband chip 31 controlling the RF circuit 20-2 to execute operating state 1, and receiving RF receive signals in the second frequency band is the baseband chip 31 controlling the RF circuit 20-2 to execute operating state 3. The dual frequencies are the first frequency band and the third frequency band. At this time, the baseband chip 31 always controls the switch 22 of the RF circuit 20-3 to be non-conductive. Outputting the RF transmission signal of the first frequency band is the baseband chip 31 controlling the RF circuit 20-1 to execute working state 1, and receiving the RF receiving signal of the first frequency band is the baseband chip 31 controlling the RF circuit 20-1 to execute working state 3; outputting the RF transmission signal of the third frequency band is the baseband chip 31 controlling the RF circuit 20-2 to execute working state 5, and receiving the RF receiving signal of the third frequency band is the baseband chip 31 controlling the RF circuit 20-2 to execute working state 6. The dual frequency is the second frequency band and the third frequency band. At this time, the baseband chip 31 always controls the switch 22 of the RF circuit 20-1 to be non-conductive. The output of the RF transmission signal of the second frequency band is the baseband chip 31 controlling the RF circuit 20-2 to execute working state 1, and the reception of the RF reception signal of the second frequency band is the baseband chip 31 controlling the RF circuit 20-2 to execute working state 3; the output of the RF transmission signal of the third frequency band is the baseband chip 31 controlling the RF circuit 20-3 to execute working state 5, and the reception of the RF reception signal of the third frequency band is the baseband chip 31 controlling the RF circuit 20-3 to execute working state 6.

[0181] Of course, the above is only one embodiment, and any permutation and combination scheme can be selected to realize the dual-frequency working mode.

[0182] The RF system 30 shown in Figure 18 can be a three-band working mode, where the baseband chip 31 controls the RF circuit 20-1 to execute working state 1 when outputting the RF transmission signal of the first frequency band, and the baseband chip 31 controls the RF circuit 20-1 to execute working state 3 when receiving the RF reception signal of the first frequency band; the baseband chip 31 controls the RF circuit 20-2 to execute working state 1 when outputting the RF transmission signal of the second frequency band, and the baseband chip 31 controls the RF circuit 20-2 to execute working state 3 when receiving the RF reception signal of the second frequency band; the baseband chip 31 controls the RF circuit 20-3 to execute working state 5 when outputting the RF transmission signal of the third frequency band, and the baseband chip 31 controls the RF circuit 20-3 to execute working state 6 when receiving the RF reception signal of the third frequency band.

[0183] For example, the RF system 30 shown in FIG18 may further include more RF circuits 20, thereby enabling the RF system 30 shown in FIG18 to output multiple RF transmit signals in the same frequency band and receive multiple RF receive signals in the same frequency band, or to implement a multi-frequency operating mode.

[0184] In some embodiments, referring to Figure 19, compared with the RF system 30 shown in Figure 16, the RF circuit 20 in the RF system 30 shown in Figure 19 is specifically the RF circuit 20 shown in Figure 5, and the RF system 30 shown in Figure 19 also includes a filter 32 (also called a third filter), and the common antenna port of the RF system 30 includes a common antenna port 1 and a common antenna port 2; the antenna port 1 of the RF circuit 20 is connected to the common antenna port 1 through the filter 32, and the antenna port 2 is connected to the common antenna port 2.

[0185] For example, when the filter 32 shown in FIG19 is exactly the same as the filter 24 shown in FIG16 , the RF system 30 shown in FIG19 is equivalent to the RF system 30 shown in FIG16 , and its specific functions are shown in FIG16 and are not repeated here.

[0186] In some embodiments, as shown in FIG20 , the RF system 30 shown in FIG20 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. The four RF circuits 20 are the RF circuits 20 shown in FIG5 . The RF system 30 includes eight common antenna ports and four filters 32. Antenna port 1 of RF circuit 20-1 is connected to common antenna port 1 via filter 32-1, and antenna port 2 is connected to common antenna port 2. Antenna port 1 of RF circuit 20-2 is connected to common antenna port 3 via filter 32-2, and antenna port 2 is connected to common antenna port 4. Antenna port 1 of RF circuit 20-3 is connected to common antenna port 5 via filter 32-3, and antenna port 2 is connected to common antenna port 6. Antenna port 1 of RF circuit 20-4 is connected to common antenna port 7 via filter 32-4, and antenna port 2 is connected to common antenna port 8.

[0187] The frequency range of filters 32-1 and 32-2 is the first frequency band, and the frequency range of filters 32-3 and 32-4 is the second frequency band. The RF system 30 shown in FIG20 is equivalent to the RF system 30 shown in FIG17 . Its specific functions are shown in FIG17 and are not described here in detail.

[0188] In other embodiments, as shown in Figure 21, the common antenna port of the RF system 30 includes one; wherein the RF circuit 20 can specifically be the RF circuit 20 shown in Figure 10, and the RF circuit 20 includes an antenna port, and the antenna port is connected to the common antenna port.

[0189] For example, in the RF system 30 shown in FIG21 , the control circuit in the baseband chip 31 is connected to the switch S1, switch 22, and switch 26 in the RF circuit 20. When the RF system 30 needs to output a filtered RF transmit signal, the control circuit in the baseband chip 31 outputs a first control signal to switch 22 and a fifth control signal to switch 26, thereby controlling switch 22 to connect terminals h and j according to the first control signal, and to connect terminals m and r according to the fifth control signal, and thereby controlling the RF circuit 20 to enter operating state 1. When the RF system 30 needs to output an unfiltered RF transmit signal, the control circuit in the baseband chip 31 outputs a second control signal to switch 22 and a sixth control signal to switch 26, thereby controlling switch 22 to connect terminals h and k according to the second control signal, and to connect terminals n and r according to the sixth control signal, and thereby controlling the RF circuit 20 to enter operating state 2. When the RF system 30 needs to receive a filtered RF receive signal, the control circuit in the baseband chip 31 outputs a third control signal to the switch 22 and a fifth control signal to the switch 26, thereby controlling the switch 22 to connect terminals i and j according to the third control signal, and to connect terminals m and r according to the fifth control signal, and controlling the RF circuit 20 to enter operating state 3. When the RF system 30 needs to receive an unfiltered RF receive signal, the control circuit in the baseband chip 31 outputs a fourth control signal to the switch 22 and a sixth control signal to the switch 26, thereby controlling the switch 22 to connect terminals i and k according to the fourth control signal, and to connect terminals n and r according to the sixth control signal, and controlling the RF circuit 20 to enter operating state 4.

[0190] For example, the process of the RF circuit 20 controlling the switch S1 refers to the process of the RF circuit 20 controlling the switch S1 described in FIG. 14 , which is not described in detail here.

[0191] In some embodiments, the RF circuit 20 shown in FIG. 21 may also be the RF circuit 20 shown in FIG. 11 , and the embodiments of the present application are not limited to this.

[0192] In other embodiments, as shown in FIG22 , an embodiment of the present application further provides a schematic structural diagram of a radio frequency system 30 , wherein the radio frequency system 30 shown in FIG22 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 . The four radio frequency circuits 20 are the radio frequency circuits 20 shown in FIG10 , and the radio frequency system 30 includes four common antenna ports. The antenna port of radio frequency circuit 20 - 1 is connected to common antenna port 1 . The antenna port of radio frequency circuit 20 - 2 is connected to common antenna port 2 . The antenna port of radio frequency circuit 20 - 3 is connected to common antenna port 3 . The antenna port of radio frequency circuit 20 - 4 is connected to common antenna port 4 .

[0193] The frequency range of the filter 24 in the RF circuit 20-1 and the filter 24 in the RF circuit 20-2 is a first frequency band, and the frequency range of the filter 24 in the RF circuit 20-3 and the filter 24 in the RF circuit 20-4 is a second frequency band. The RF system 30 can receive RF receive signals in the first frequency band and output RF transmit signals in the first frequency band, and / or receive RF receive signals in the second frequency band and output RF transmit signals in the second frequency band.

[0194] Exemplarily, the RF system 30 receives RF signals in a first frequency band and outputs RF transmit signals in the first frequency band, or receives RF signals in a second frequency band and outputs RF transmit signals in the second frequency band. The RF system 30 operates in a single-frequency mode. To output RF transmit signals, the baseband chip 31 controls RF circuits 20-1, 20-2, 20-3, and 20-4 to execute operating state 2. To receive RF signals, the baseband chip 31 controls RF circuits 20-1, 20-2, 20-3, and 20-4 to execute operating state 4.

[0195] The RF system 30 shown in FIG22 can operate in a dual-band mode. Specifically, outputting RF transmit signals in the first frequency band occurs when the baseband chip 31 controls RF circuit 20-1 and RF circuit 20-2 to execute working state 1 and working state 1, thereby outputting two RF transmit signals in the first frequency band from common antenna port 1 and common antenna port 2. Receiving RF receive signals in the first frequency band occurs when the baseband chip 31 controls RF circuit 20-1 and RF circuit 20-2 to execute working state 3 and working state 3, thereby receiving two RF receive signals in the first frequency band from common antenna port 1 and common antenna port 2. Outputting RF transmit signals in the second frequency band occurs when the baseband chip 31 controls RF circuit 20-3 and RF circuit 20-4 to execute working state 1 and working state 1, thereby outputting two RF transmit signals in the second frequency band from common antenna port 3 and common antenna port 4. To receive the RF receiving signal in the second frequency band, the baseband chip 31 controls the RF circuit 20 - 3 to execute working state 3 and the RF circuit 20 - 4 to execute working state 3 , thereby receiving two RF receiving signals in the second frequency band from the common antenna port 3 and the common antenna port 4 .

[0196] In other embodiments, as shown in FIG23 , based on the RF system 20 shown in FIG16 , a fourth switch (switch 33 shown in FIG23 ) can be set so that the RF system 30 includes a common antenna port. Exemplarily, compared to the RF circuit 20 shown in FIG16 , the RF circuit 20 shown in FIG23 further includes a switch 33 (also referred to as a 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 ); wherein the RF circuit 20 is specifically the RF circuit 10 shown in FIG8 , and the RF circuit 20 includes a filter 24 , and the antenna port of the RF circuit 20 includes an antenna port 1 and an antenna port 2 . 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 ; and the v-terminal of the switch 33 is connected to the common antenna port of the RF system 30 .

[0197] For example, in the RF system 30 shown in FIG23 , the control circuit in the baseband chip 31 is connected to the switch S1, switch 22, and switch 33 in the RF circuit 20. When the RF system 30 needs to output a filtered RF transmit signal, the control circuit in the baseband chip 31 outputs a first control signal to the switch 22 to control the switch 22 to connect the h terminal and the j terminal according to the first control signal, and controls the RF circuit 20 to execute working 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 connect the t terminal and the v terminal according to the seventh control signal. When the RF system 30 needs to output an unfiltered RF transmit signal, the control circuit in the baseband chip 31 outputs a second control signal to the switch 22 to control the switch 22 to connect the h terminal and the k terminal according to the second control signal, and controls the RF circuit 20 to execute the working 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 connect the u terminal and the v terminal according to the eighth control signal. When the RF system 30 needs to receive a filtered RF receive signal, the control circuit in the baseband chip 31 outputs a third control signal to the switch 22 to control the switch 22 to connect the i terminal and the j terminal according to the third control signal, and controls the RF circuit 20 to execute the working 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 connect the t terminal and the v terminal according to the seventh control signal. When the RF system 30 needs to receive an unfiltered RF receive signal, the control circuit in the baseband chip 31 outputs a fourth control signal to the switch 22 to control the switch 22 to connect the i terminal and the k terminal of the switch 22 according to the fourth control signal, and controls the RF circuit 20 to execute working 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 connect the t terminal and the u terminal of the switch 33 according to the eighth control signal.

[0198] In other embodiments, as shown in FIG24 , based on the RF system 20 shown in FIG19 , a fourth switch can be provided so that the RF system 30 includes a common antenna port. For example, compared to the RF circuit 20 shown in FIG19 , the RF circuit 20 shown in FIG24 includes not only a filter 32 but also a switch 33 (also referred to as a 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 ). The RF circuit 20 is specifically the RF circuit 10 shown in FIG5 , and the antenna ports of the RF circuit 20 include antenna port 1 and antenna port 2. Antenna port 1 is connected to the t-terminal of the switch 33 through the filter 32; antenna port 2 is connected to the u-terminal of the switch 33; and the v-terminal of the switch 33 is connected to the common antenna port of the RF system 30.

[0199] For example, when the filter 32 shown in FIG. 24 is exactly the same as the filter 24 shown in FIG. 23 , the RF system 30 shown in FIG. 24 is equivalent to the RF system 30 shown in FIG. 23 , and its specific functions are shown in FIG. 23 and are not described here in detail.

[0200] For example, the radio frequency system shown in FIG. 23 or FIG. 24 can realize multiple-input and multiple-output by setting up multiple radio frequency circuits 20, which will not be described in detail here.

[0201] Illustratively, an embodiment of the present application further provides a communication device, comprising an antenna and a radio frequency system 30 as shown in any one of Figures 16 to 18 , wherein the antenna is connected to a 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 connected to one common antenna port of the radio frequency system 30.

[0202] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

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.

Images