Radio frequency front-end circuit, radio frequency transceiving device and electronic equipment

Abstract

The invention provides a radio frequency front-end circuit, a radio frequency transceiving device and electronic equipment. The radio frequency front-end circuit comprises a radio frequency transceiver, a directional coupler and a first PAMID; the radio frequency transceiver sends out a first radio frequency signal, a second radio frequency signal and a first control signal; the directional coupler is provided with a transmission port and a first isolation port, and the transmission port is used for outputting a first radio frequency signal; the first PAMID comprises a first coupler, the first coupler is provided with a first output end, the first PAMID is provided with a second isolation port, a first connecting end and a second connecting end, the first output end is electrically connected with the first isolation port through the second isolation port, and one of the first connecting end and the second connecting end is used for outputting a second radio frequency signal; the first control signal is used for setting the first output end of the first coupler to be in a high isolation mode, so that when the output port of the second radio frequency signal is switched from one of the first connecting end and the second connecting end to the other one, the impedance of the first isolation port remains unchanged.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a radio frequency front-end circuit, a radio frequency transceiver and an electronic device. Background Art

[0002] With the development of technology, electronic devices with communication functions such as mobile phones are becoming more and more popular and their functions are becoming more and more powerful. Electronic devices usually include radio frequency transceivers to realize the communication function of electronic devices. However, the performance of radio frequency transceivers in electronic devices in related technologies when transmitting and receiving electromagnetic wave signals is poor, and there is still room for improvement. Summary of the invention

[0003] In a first aspect, an embodiment of the present application provides a radio frequency front-end circuit, the radio frequency front-end circuit comprising:

[0004] A radio frequency transceiver, configured to send a first radio frequency signal, a second radio frequency signal and a first control signal;

[0005] A directional coupler having a transmission port and a first isolation port, wherein the transmission port is used to output a first radio frequency signal;

[0006] A first PAMID, comprising a first coupler, wherein the first coupler has a first output end, the first PAMID has a second isolation port, a first connection end, and a second connection end, wherein the second isolation port is electrically connected to the first output end, and the second isolation port is also used to be electrically connected to the first isolation port, and one of the first connection end and the second connection end is used to output the second radio frequency signal;

[0007] The first control signal is used to set the first output end of the first coupler to a high isolation mode so that when the output port of the second RF signal is switched from one of the first connection end and the second connection end to the other, the impedance of the first isolation port remains unchanged.

[0008] In a second aspect, the present application provides a radio frequency transceiver device, the radio frequency transceiver device comprising:

[0009] The first radiator;

[0010] The second radiator;

[0011] a third radiator, the position of the third radiator being different from the position of the second radiator; and

[0012] The radio frequency front-end circuit as described in the first aspect;

[0013] The transmission port is electrically connected to the first radiator, the first connection end is electrically connected to the second radiator, and the second connection end is electrically connected to the third radiator.

[0014] In a third aspect, the present application provides an electronic device, wherein the electronic device comprises the radio frequency transceiver device described in the second aspect.

[0015] In summary, the RF transceiver of the RF front-end circuit provided in the embodiment of the present application can generate a first RF signal and a second RF signal, so that the RF front-end circuit can meet the communication function of the first frequency band corresponding to the first RF signal, and can also meet the communication function of the second frequency band corresponding to the second RF signal. In addition, in the RF front-end circuit provided in the embodiment of the present application, the RF transceiver is used to send a first control signal, and the first control signal is used to set the first output end of the first coupler to a high isolation mode. Since the second isolation port is electrically connected to the first output end, and the second isolation port is electrically connected to the first isolation port, when the first output end is in high isolation mode, the impedance of the first isolation port remains unchanged or approximately remains unchanged. When the output port of the second RF signal is switched from one of the first connection end and the second connection end to the other, the impedance of the first isolation port remains unchanged, and the coupling coefficient of the first isolation port remains unchanged, thereby making the power of the transmission port of the directional coupler outputting the first RF signal remain stable, so that the first frequency band generated by the first radiator electrically connected to the transmission port of the directional coupler has good communication performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of an electronic device provided in one embodiment of the present application;

[0018] Figure 2 An implementation method Figure 1 A circuit block diagram of a radio frequency transceiver in an electronic device shown in ;

[0019] Figure 3 Another embodiment Figure 1 A circuit block diagram of a radio frequency transceiver in an electronic device shown in ;

[0020] Figure 4 A schematic diagram of a radio frequency front-end circuit provided in one embodiment of the present application;

[0021] Figure 5 A schematic diagram of a radio frequency front-end circuit provided in another embodiment of the present application;

[0022] Figure 6 A schematic diagram of a radio frequency front-end circuit provided in yet another embodiment of the present application;

[0023] Figure 7 A schematic diagram of the control flow of a radio frequency front-end circuit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0024] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the embodiments described in the present application are only a part of the embodiments, not all of the embodiments. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present application.

[0025] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive, independent, or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0026] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example: a component or device including one or more parts is not limited to the one or more parts listed, but optionally includes one or more parts that are not listed but inherent to the exemplified product, or one or more parts that it should have based on the described function.

[0027] An embodiment of the present application provides an electronic device 1. The electronic device 1 includes but is not limited to a mobile phone, a telephone, a television, a tablet computer (Pad), a personal computer, a laptop computer (Personal Computer, PC), a vehicle-mounted device, a headset, a watch, a wearable device, and other devices capable of transmitting and receiving electromagnetic wave signals. In the schematic diagram of the embodiment of the present application, the electronic device 1 is illustrated as a mobile phone as an example, which should be understood that it should not be understood as a limitation on the electronic device 1 provided in the embodiment of the present application. The electronic device 1 provided in the embodiment of the present application is introduced.

[0028] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 A schematic diagram of an electronic device provided in one embodiment of the present application; Figure 2 An implementation method Figure 1 A circuit block diagram of a radio frequency transceiver in an electronic device shown in ; Figure 3 Another embodiment Figure 1 A circuit block diagram of a radio frequency transceiver in an electronic device shown in the figure. The electronic device 1 includes a radio frequency transceiver 10. The radio frequency transceiver 10 is used to transmit electromagnetic wave signals in a first frequency band and electromagnetic wave signals in a second frequency band. In one embodiment, the radio frequency transceiver 10 is also used to receive electromagnetic wave signals in a first frequency band and electromagnetic wave signals in a second frequency band. In this way, the radio frequency transceiver 10 can realize the communication functions of the first frequency band and the second frequency band. The implementation manner of the present application does not limit whether the radio frequency transceiver 10 can receive electromagnetic wave signals in the first frequency band, and does not limit whether the radio frequency transceiver 10 can receive electromagnetic wave signals in the second frequency band.

[0029] The first frequency band may be, but is not limited to, a frequency band of a communication standard such as 2G, 3G, 4G, 5G, or 6G. For example, the first frequency band may be, but is not limited to, a low frequency band (LB), a middle frequency band (MB), or a high frequency band (HB).

[0030] The second frequency band may be, but is not limited to, a frequency band of a communication standard such as 2G, 3G, 4G, 5G, or 6G. For example, the second frequency band may be, but is not limited to, a low frequency band (Low Band, LB), a middle frequency band (Middle Band, MB), or a high frequency band (High Band, HB), etc.

[0031] In one embodiment, the RF transceiver 10 can implement a 4G-5G dual connection (ENDC) combination of the first frequency band and the second frequency band. When the RF transceiver 10 can implement an ENDC combination of the first frequency band and the second frequency band, the RF transceiver 10 can achieve higher data transmission and better coverage in the first frequency band, and can achieve higher data transmission and better coverage in the second frequency band. Therefore, the RF transceiver 10 has good communication performance in both the first frequency band and the second frequency band.

[0032] For example, in this embodiment, the first frequency band is the N41 frequency band, and the second frequency band is the B1 frequency band, so that the RF transceiver 10 can implement ENDC of the N41 frequency band + the B1 frequency band. Alternatively, in other embodiments, the first frequency band is the B1 frequency band, and the second frequency band is the N41 frequency band, so that the RF transceiver 10 can implement ENDC of the N41 frequency band + the B1 frequency band.

[0033] In one embodiment, the electronic device 1 further includes a middle frame 30, a display screen 50 and a back cover 60. The display screen 50 is disposed on one side of the middle frame 30. The display screen 50 is a component for realizing a display function in the electronic device 1. The display screen 50 may be, but is not limited to, a screen with a touch function, or a screen without a touch function, which is not limited in the present application. The back cover 60 is disposed on the other side of the middle frame 30. In other words, the back cover 60 and the display screen 50 are respectively disposed on two opposite sides of the middle frame 30. When the electronic device 1 further includes a battery, the back cover 60 is also referred to as a battery cover. The material of the back cover 60 may be metal or non-metal, which is not limited in the present embodiment.

[0034] It is understandable that the introduction of the electronic device 1 provided in the embodiment of the present application is only an introduction to an application environment of the radio frequency transceiver 10. It should not be understood as a limitation of the radio frequency transceiver 10 provided in the embodiment of the present application. Next, the radio frequency transceiver 10 provided in the embodiment of the present application is introduced in detail.

[0035] Please continue reading Figure 2 , the RF transceiver device 10 includes a first radiator 210, a second radiator 220, a third radiator 230 and a RF front-end circuit 100. The RF front-end circuit 100 is used to output a first RF signal and a second RF signal. The RF front-end circuit 100 is electrically connected to the first radiator 210 to output the first RF signal to the first radiator 210, and the first radiator 210 transmits an electromagnetic wave signal of a first frequency band according to the first RF signal. The RF front-end circuit 100 is electrically connected to one of the second radiator 220 and the third radiator 230, and the one of the second radiator 220 and the third radiator 230 transmits an electromagnetic wave signal of a second frequency band according to the second RF signal. In this embodiment, the position of the third radiator 230 is different from that of the second radiator 220. Specifically, the specific structure of the RF front-end circuit 100 will be described below, please refer to Figure 2In the RF front-end circuit 100 , the transmission port 120 a is electrically connected to the first radiator 210 , the first connection end 130 b is electrically connected to the second radiator 220 , and the second connection end 130 c is electrically connected to the third radiator 230 .

[0036] The first radiator 210 can be a Laser Direct Structuring (LDS) radiator, or a Flexible Printed Circuit (FPC) radiator, or a Print Direct Structuring (PDS) radiator, or a metal branch radiator. When the RF transceiver 10 is applied to an electronic device 1, the first radiator 210 can be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the first radiator 210 can be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the first radiator 210 can also be a metal frame radiator designed using a metal middle frame 30.

[0037] In this embodiment, the first radiator 210 is used to receive the first RF signal sent by the RF front-end circuit 100, and transmit an electromagnetic wave signal of the first frequency band according to the first RF signal. In other embodiments, the first radiator 210 is also used to receive the electromagnetic wave signal of the first frequency band.

[0038] The second radiator 220 can be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the RF transceiver 10 is applied to an electronic device 1, the second radiator 220 can be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the second radiator 220 can be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the second radiator 220 can also be a metal frame radiator designed with a metal middle frame 30. The type of the second radiator 220 can be the same as that of the first radiator 210, or it can be different from the type of the first radiator 210, which is not limited in this embodiment.

[0039] In this embodiment, the second radiator 220 is used to receive the second RF signal sent by the RF front-end circuit 100, and transmit an electromagnetic wave signal of a second frequency band according to the second RF signal. In other embodiments, the second radiator 220 is also used to receive an electromagnetic wave signal of a second frequency band.

[0040] The third radiator 230 may be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the RF transceiver 10 is applied to an electronic device 1, the third radiator 230 may be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the third radiator 230 may be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the third radiator 230 may also be a metal frame radiator designed using the metal middle frame 30. The type of the third radiator 230 may be the same as the type of the first radiator 210, or it may be different from the type of the first radiator 210; accordingly, the type of the third radiator 230 may be the same as the type of the second radiator 220, or it may be different from the type of the second radiator 220, which is not limited in this embodiment.

[0041] In this embodiment, the third radiator 230 is used to receive the second RF signal sent by the RF front-end circuit 100, and transmit an electromagnetic wave signal of the second frequency band according to the second RF signal. In other embodiments, the third radiator 230 is also used to receive the electromagnetic wave signal of the second frequency band.

[0042] In this embodiment, the position of the third radiator 230 is different from that of the second radiator 220. For example, when the RF transceiver 10 is applied to an electronic device 1, the second radiator 220 is located in the upper half of the electronic device 1 in a vertical screen state, and the third radiator 230 is located in the lower half of the electronic device 1 in a vertical screen state. In this way, the second radiator 220 is also called an upper antenna radiator, and the third radiator 230 is also called a lower antenna radiator. It can be understood that the example of the position of the second radiator 220 and the third radiator 230 is only an embodiment in which the positions of the second radiator 220 and the third radiator 230 are different, and should not be understood as a limitation on the RF front-end circuit 100 and the electronic device 1 provided in the embodiments of the present application.

[0043] Since the third radiator 230 and the second radiator 220 are located at different positions, the performance of the second radiator 220 when supporting the second frequency band is different from the performance of the third radiator 230 when supporting the second frequency band. The RF transceiver 10 is used to output the second RF signal to one of the second radiator 220 and the third radiator 230, and the RF transceiver 10 can switch the second RF signal from being output to the second radiator 220 to being output to the third radiator 230; or, the RF transceiver 10 can switch the second RF signal from being output to the third radiator 230 to being output to the third radiator 230. In this way, the RF transceiver 10 can have better communication performance in the second frequency band.

[0044] See also Figure 3 , Figure 3 In the embodiment, the RF transceiver 10 comprises a first radiator 210, a second radiator 220, a third radiator 230, a fourth radiator 240, a fifth radiator 250 and a RF front-end circuit 100. The RF transceiver 10 is used to transmit an electromagnetic wave signal in a first frequency band.

[0045] Please refer to the previous description for the first radiator 210 , the second radiator 220 , and the third radiator 230 , which will not be described in detail here.

[0046] In this embodiment, the RF front-end circuit 100 is also used to output a third RF signal. The RF front-end circuit 100 is electrically connected to one of the fourth radiator 240 and the fifth radiator 250, and the fourth radiator 240 and the fifth radiator 250 transmit an electromagnetic wave signal of a third frequency band according to the third RF signal. Specifically, the third connection terminal 150b in the RF front-end circuit 100 is electrically connected to the fourth radiator 240, and the fourth connection terminal 150c is electrically connected to the fifth radiator 250.

[0047] The fourth radiator 240 may be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the RF transceiver 10 is applied to an electronic device 1, the fourth radiator 240 may be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the fourth radiator 240 may be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the fourth radiator 240 may also be a metal frame radiator designed from a metal middle frame 30. The type of the fourth radiator 240 may be the same as the type of the first radiator 210, or may be different from the type of the first radiator 210; accordingly, the type of the fourth radiator 240 may be the same as the type of the second radiator 220, or may be different from the type of the second radiator 220, which is not limited in this embodiment.

[0048] In this embodiment, the fourth radiator 240 is used to receive the third RF signal sent by the RF front-end circuit 100, and transmit an electromagnetic wave signal of a third frequency band according to the third RF signal. In other embodiments, the fourth radiator 240 is also used to receive an electromagnetic wave signal of a third frequency band.

[0049] The fifth radiator 250 can be a laser direct structuring (LDS) radiator, or a flexible printed circuit (FPC) radiator, or a print direct structuring (PDS) radiator, or a metal branch radiator. When the radio frequency transceiver 10 is applied to an electronic device 1, the fifth radiator 250 can be a mechanical design antenna (MDA) radiator designed using the metal insert of the electronic device 1 itself. For example, the fifth radiator 250 can be an antenna radiator designed using the middle frame 30 formed of plastic and metal of the electronic device 1. In addition, the fifth radiator 250 can also be a metal frame radiator designed from a metal middle frame 30. The type of the fifth radiator 250 can be the same as or different from the type of the first radiator 210, which is not limited here.

[0050] In this embodiment, the position of the third radiator 230 is different from that of the second radiator 220. For example, when the RF transceiver 10 is applied to an electronic device 1, the second radiator 220 is located in the upper half of the electronic device 1 in a vertical screen state, and the third radiator 230 is located in the lower half of the electronic device 1 in a vertical screen state. In this way, the second radiator 220 is also called an upper antenna radiator, and the third radiator 230 is also called a lower antenna radiator. It can be understood that the example of the position of the second radiator 220 and the third radiator 230 is only an embodiment in which the positions of the second radiator 220 and the third radiator 230 are different, and should not be understood as a limitation on the RF front-end circuit 100 and the electronic device 1 provided in the embodiments of the present application.

[0051] In one embodiment, the fifth radiator 250 and the fourth radiator 240 are located at different positions, so the performance of the fourth radiator 240 when supporting the third frequency band is different from the performance of the fifth radiator 250 when supporting the third frequency band. The RF transceiver 10 is used to output the third RF signal to one of the fourth radiator 240 and the fifth radiator 250, and the RF transceiver 10 can switch the third RF signal from being output to the fourth radiator 240 to being output to the fifth radiator 250; or, the RF transceiver 10 can switch the third RF signal from being output to the fifth radiator 250 to being output to the fourth radiator 240. In this way, the RF transceiver 10 can have better communication performance in the third frequency band.

[0052] Next, the RF front-end circuit 100 provided in the embodiment of the present application is described in detail. Figure 4 , Figure 4A schematic diagram of a radio frequency front-end circuit provided in one embodiment of the present application. The radio frequency front-end circuit 100 includes a radio frequency transceiver 110, a directional coupler 120 and a first PAMID 130. The radio frequency transceiver 110 is used to send a first radio frequency signal, a second radio frequency signal and a first control signal. The directional coupler 120 has a transmission port 120a and a first isolation port 120b, and the transmission port 120a is used to output the first radio frequency signal. The first PAMID 130 includes a first coupler 131, the first coupler 131 has a first output end 131a, and the first PAMID 130 has a second isolation port 130a, a first connection end 130b and a second connection end 130c. The second isolation port 130a is electrically connected to the first output end 131a, and the second isolation port 130a is also used to be electrically connected to the first isolation port 120b, and one of the first connection end 130b and the second connection end 130c is used to output the second radio frequency signal. The first control signal is used to set the first output end 131a of the first coupler 131 to a high isolation mode, so that when the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged.

[0053] In this embodiment, the first radio frequency signal is used to generate an electromagnetic wave signal in a first frequency band. Specifically, in this embodiment, the transmission port 120a is electrically connected to the first radiator 210 to transmit the first radio frequency signal to the first radiator 210, so that the first radiator 210 generates an electromagnetic wave signal in a first frequency band according to the first radio frequency signal, and radiates the first electromagnetic wave signal.

[0054] In this embodiment, the directional coupler 120 further has an input port 120d. The input port 120d is electrically connected to the RF transceiver 110 to receive the first RF signal and output the first RF signal through the transmission port 120a.

[0055] The first PAMID 130 is electrically connected to the RF transceiver 110 to receive the second RF signal. In one embodiment, the unit generating the first RF signal in the RF transceiver 110 is different from the unit generating the second RF signal in the RF transceiver 110, and the unit generating the first RF signal and the unit generating the second RF signal are separately packaged. In another embodiment, the unit generating the first RF signal and the unit generating the second RF signal are packaged as a whole.

[0056] The second RF signal is used to generate an electromagnetic wave signal of a second frequency band. Specifically, in this embodiment, the first connection end 130b is electrically connected to the second radiator 220, and the second connection end 130c is electrically connected to the third radiator 230. The second RF signal is output via one of the first connection end 130b and the second connection end 130c. When the second RF signal is output to the second radiator 220 via the first connection end 130b, the second radiator 220 generates an electromagnetic wave signal of a second frequency band according to the second RF signal. When the second RF signal is output to the third radiator 230 via the second connection end 130c, the third radiator 230 generates an electromagnetic wave signal of a second frequency band according to the second RF signal.

[0057] The output port for outputting the second radio frequency signal in the first PAMID 130 is one of the first connection end 130b and the second connection end 130c. The output port for outputting the second radio frequency signal in the first PAMID 130 can be switched from one of the first connection ends 130b to the other. Specifically, the output port of the second radio frequency signal is switched from one of the first connection end 130b and the second connection end 130c to the other, including: the output port for outputting the second radio frequency signal of the first PAMID 130 can be switched from the first connection end 130b to the second connection end 130c; or, the output port for outputting the second radio frequency signal of the first PAMID 130 can be switched from the second connection end 130c to the first connection end 130b.

[0058] In one embodiment, the first frequency band is different from the second frequency band. For example, in this embodiment, the first frequency band is the N41 frequency band, and the second frequency band is the B1 frequency band. In another embodiment, the first frequency band is the B1 frequency band, and the second frequency band is the N41 frequency band.

[0059] The so-called PAMID refers to Power Amplifier and Module in Package (PAMID), which can also be called power amplifier and other RF functional modules.

[0060] In this embodiment, the directional coupler 120 is located outside the first PAMID 130, so the directional coupler 120 is also called an external directional coupler. The first PAMID 130 includes a first coupler 131, so the first coupler 131 is also called a built-in directional coupler.

[0061] The second isolated port 130a is electrically connected to the first output port 131a, and the second isolated port 130a is also used to be electrically connected to the first isolated port 120b; in other words, the first output port 131a is electrically connected to the first isolated port 120b of the directional coupler 120 through the second isolated port 130a.

[0062] The high isolation mode is also referred to as the high isolation state mode (HISO MODE). In one embodiment, when the first output end 131a of the first coupler 131 is in the high isolation mode, the impedance of the first output end 131a of the first coupler 131 is greater than or equal to a preset impedance value, and the impedance remains unchanged, or approximately remains unchanged. Since the first output end 131a of the first coupler 131 is in the high isolation mode, when the output port of the second RF signal in the first PAMID 130 is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged, thereby making the power of the first RF signal output by the transmission port 120a of the directional coupler 120 remain stable.

[0063] If the impedance of the first isolation port 120b of the directional coupler 120 changes significantly (also called a large fluctuation), the transmission port 120a of the directional coupler 120 will cause the first RF signal output by the transmission port 120a of the directional coupler 120 to be distorted, thereby affecting the power of the first RF signal, so that the communication performance of the first frequency band corresponding to the first RF signal is poor. For example, when the first frequency band corresponding to the first RF signal is the N41 frequency band, and the second frequency band corresponding to the second RF signal is the B1 frequency band, if the impedance of the first isolation port 120b of the directional coupler 120 changes significantly (also called a large fluctuation), the power of the N41 frequency band will fluctuate by 1dbm, thereby causing the communication function of the N41 frequency band to be poor.

[0064] In summary, the RF transceiver 110 of the RF front-end circuit 100 provided in the embodiment of the present application can generate a first RF signal and a second RF signal, so that the RF front-end circuit 100 can satisfy the communication function of the first frequency band corresponding to the first RF signal, and can also satisfy the communication function of the second frequency band corresponding to the second RF signal. In addition, in the RF front-end circuit 100 provided in the embodiment of the present application, the RF transceiver 110 is used to send a first control signal, and the first control signal is used to set the first output end 131a of the first coupler 131 to a high isolation mode. Since the second isolation port 130a is electrically connected to the first output end 131a, and the second isolation port 130a is electrically connected to the first isolation port 120b, when the first output end 131a is in the high isolation mode, the impedance of the first isolation port 120b remains unchanged or approximately remains unchanged. When the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, so that the power of the first RF signal output by the transmission port 120a of the directional coupler 120 remains stable, so that the first frequency band generated by the first radiator 210 electrically connected to the transmission port 120a of the directional coupler 120 has better communication performance.

[0065] In one embodiment, the first control signal is used to set the first output end 131a of the first coupler 131 to the high isolation mode before the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other.

[0066] In the RF front-end circuit 100 provided in the application embodiment, the first control signal is used to set the first output end 131a of the first coupler 131 to the high isolation mode before the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other. Therefore, when the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, so that the power of the transmission port 120a of the directional coupler 120 outputting the first RF signal remains stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has better communication performance.

[0067] See also Figure 5, Figure 5 A schematic diagram of a radio frequency front-end circuit provided in another embodiment of the present application. In this embodiment, the radio frequency front-end circuit 100 further includes a detection circuit 140. The detection circuit 140 is used to detect the power of the first radio frequency signal to obtain a first detection power. The radio frequency transceiver 110 is used to send the first control signal when the detection circuit 140 detects the power of the first radio frequency signal.

[0068] The detection circuit 140 may also be referred to as a monitoring receiver (MRX). The detection circuit 140 is configured to detect the power of the second RF signal to obtain a first detection power.

[0069] In one embodiment, the RF transceiver 110 is used to determine whether it is necessary to switch the output port of the second RF signal according to the first detection power. For example, in one embodiment, when the first detection power is less than or equal to the first preset power, the RF transceiver 110 switches the output port of the second RF signal. For example, when the output port of the second RF signal is the first connection terminal 130b, and the first detection power is less than or equal to the first preset power, the RF transceiver 110 switches the output port of the second RF signal to the second connection terminal 130c. When the output port of the second RF signal is the second connection terminal 130c, and the first detection power is less than or equal to the first preset power, the RF transceiver 110 switches the output port of the second RF signal to the first connection terminal 130b.

[0070] It can be understood that, in one embodiment, when the first detection power is greater than the first preset power, the RF transceiver 110 keeps the output port of the second RF signal unchanged. For example, when the output port of the second RF signal is the first connection end 130b, and the first detection power is greater than the first preset power, the RF transceiver 110 keeps the output port of the second RF signal at the first connection end 130b. When the output port of the second RF signal is the second connection end 130c, and the first detection power is greater than the first preset power, the RF transceiver 110 keeps the output port of the second RF transceiver 110 at the second connection end 130c.

[0071] In one embodiment, the RF transceiver 110 of the RF front-end circuit 100 is used to send a first power detection signal. The detection circuit 140 is electrically connected to the RF transceiver 110 to receive the first power detection signal, and under the control of the first power detection signal, detects the power of the second RF signal to obtain the first detection power.

[0072] In the RF front-end circuit 100 provided in the embodiment of the present application, when the detection circuit 140 detects the power of the second RF signal, the RF transceiver 110 may switch the output port of the second RF signal according to the situation of the first detected power. Therefore, the RF transceiver 110 of the RF front-end circuit 100 provided in the embodiment of the present application sends the first control signal when the detection circuit 140 detects the second RF signal. Therefore, the RF transceiver 110 can send the first control signal before the output port of the second RF signal is switched, and the first control signal sets the first output terminal 131a of the first coupler 131 to the high isolation mode. When the first output terminal 131a is in the high isolation mode, the impedance of the first isolation port 120b remains unchanged or approximately remains unchanged. When the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, so that the power of the first RF signal output by the transmission port 120a of the directional coupler 120 remains stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has better communication performance.

[0073] In one embodiment, the first PAMID 130 further comprises a first detection terminal 130d. The first PAMID 130 further comprises a second coupler 132. The second coupler 132 comprises a second output terminal 132a, and the second output terminal 132a is electrically connected to the first detection terminal 130d. The detection circuit 140 is electrically connected to the first detection terminal 130d to detect the power of the second RF signal.

[0074] In this embodiment, the first PAMID 130 includes a first coupler 131 and a second coupler 132, wherein a first output end 131a of the first coupler 131 is electrically connected to the first isolation port 120b through the second isolation port 130a, and a second output end 132a of the second coupler 132 is electrically connected to the first detection end 130d. The detection circuit 140 is electrically connected to the second output end 132a of the second coupler 132 through the first detection end 130d to detect the power of the second RF signal and obtain the first detection power. The RF transceiver 110 is used to send the first control signal when the detection circuit 140 detects the power of the second RF signal to control the first output end 131a of the first coupler 131 to be set to a high isolation mode, so that when the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged.

[0075] It can be seen that the structure of the RF front-end circuit 100 provided in the embodiment of the present application is simple and easy to implement, and can well realize the detection of the second RF signal, and set the first output end 131a of the first coupler 131 to a high isolation mode when detecting the power of the second RF signal. When the first output end 131a is in the high isolation mode, the impedance of the first isolation port 120b remains unchanged or approximately remains unchanged. When the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, thereby making the power of the transmission port 120a of the directional coupler 120 outputting the first RF signal remain stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has good communication performance.

[0076] In the schematic diagram of this embodiment, the directional coupler 120 also has a coupling port 120c. The detection circuit 140 is also electrically connected to the coupling port 120c to detect the power of the first RF signal to obtain a third power. In other embodiments, the detection circuit 140 is not electrically connected to the coupling port 120c. This application defines whether the detection circuit 140 is electrically connected to the coupling port 120c.

[0077] See also Figure 6 , Figure 6A schematic diagram of a radio frequency front-end circuit provided for another embodiment of the present application. The radio frequency transceiver 110 is also used to send a third radio frequency signal. The radio frequency front-end circuit 100 also includes a second PAMID 150 and a switching circuit 160. The second PAMID 150 includes a third coupler 151. The third coupler 151 has a third output terminal 151a. The second PAMID 150 has a third isolation port 150a, a third connection terminal 150b and a fourth connection terminal 150c. The third isolation port 150a is electrically connected to the third output terminal 151a, and one of the third connection terminal 150b and the fourth connection terminal 150c is used to output the third radio frequency signal. The switching circuit 160 is used to switch the second isolation port 130a and one of the third isolation port 150a to be electrically connected to the first isolation port 120b. When the switching circuit 160 is used to electrically connect the second isolation port 130a to the first isolation port 120b, the RF front-end circuit 100 is used to support the first frequency band and the second frequency band, wherein the first RF signal is used to support the first frequency band, and the second RF signal is used to support the second frequency band. When the switching circuit 160 is used to electrically connect the third isolation port 150a to the first isolation port 120b, the RF front-end circuit 100 is used to support the first frequency band and the third frequency band, wherein the third RF signal is used to support the third frequency band.

[0078] In one embodiment, the unit generating the third RF signal in the RF transceiver 110 is different from the unit generating the first RF signal and the unit generating the second RF signal in the RF transceiver 110, and the unit generating the third RF signal, the unit generating the first RF signal, and the unit generating the second RF signal are packaged separately. In another embodiment, the unit generating the first RF signal, the unit generating the second RF signal, and the unit generating the third RF signal are packaged as a whole.

[0079] The third connection end 150b is used to be electrically connected to the fourth radiator 240, and the fourth connection end 150c is used to be electrically connected to the fifth radiator 250. The third RF signal is outputted via one of the third connection end 150b and the fourth connection end 150c. When the third RF signal is outputted to the fourth radiator 240 via the third connection end 150b, the fourth radiator 240 generates an electromagnetic wave signal of a third frequency band according to the third RF signal. When the third RF signal is outputted to the fifth radiator 250 via the fourth connection end 150c, the fifth radiator 250 generates an electromagnetic wave signal of a third frequency band according to the third RF signal.

[0080] The output port for outputting the third radio frequency signal in the second PAMID 150 is one of the third connection terminal 150b and the fourth connection terminal 150c. The output port for outputting the third radio frequency signal in the second PAMID 150 can be switched from one of the third connection terminals 150b to the other. Specifically, the output port of the third radio frequency signal is switched from one of the third connection terminal 150b and the fourth connection terminal 150c to the other, including: the output port for outputting the third radio frequency signal of the second PAMID 150 can be switched from the third connection terminal 150b to the fourth connection terminal 150c; or, the output port for outputting the third radio frequency signal of the second PAMID 150 can be switched from the fourth connection terminal 150c to the third connection terminal 150b.

[0081] In one embodiment, the third frequency band is different from the first frequency band, and the third frequency band is also different from the second frequency band.

[0082] When the switching switch circuit 160 is used to electrically connect the second isolation port 130a to the first isolation port 120b, the RF front-end circuit 100 is used to support the first frequency band and the second frequency band. In this way, the RF transceiver device 10 used by the RF front-end circuit 100 can realize the communication of the first frequency band and the second frequency band, and has a good communication function. For example, the RF transceiver device 10 used by the RF front-end circuit 100 can realize the ENDC combination of the first frequency band and the second frequency band.

[0083] The RF front-end circuit 100 provided in this embodiment, when the switching switch circuit 160 is used to electrically connect the third isolation port 150a to the first isolation port 120b, the RF front-end circuit 100 is used to support the first frequency band and the third frequency band. In this way, the RF transceiver device 10 used by the RF front-end circuit 100 can realize the communication of the first frequency band and the third frequency band, and has a good communication function. For example, the RF transceiver device 10 used by the RF front-end circuit 100 can realize the ENDC combination of the first frequency band and the third frequency band.

[0084] The RF front-end circuit 100 provided in the embodiment of the present application, the RF transceiver 110 is also used to send a third RF signal, and the RF front-end circuit 100 also includes a second PAMID 150 and a switching circuit 160. Therefore, the RF front-end circuit 100 provided in the embodiment of the present application can be used to support the first frequency band and the second frequency band when the switching circuit 160 is used to electrically connect the second isolation port 130a to the first isolation port 120b; when the switching circuit 160 is used to electrically connect the third isolation port 150a to the first isolation port 120b, the RF front-end circuit 100 is used to support the first frequency band and the third frequency band, wherein the third RF signal is used to support the third frequency band. In this way, the RF front-end circuit 100 and the RF transceiver device 10 used by the RF front-end circuit 100 can support more frequency bands.

[0085] In one embodiment, the second frequency band includes a medium frequency band, and the third frequency band includes a high frequency band.

[0086] Furthermore, in one embodiment, the RF transceiver 110 is further configured to generate a second control signal. When the switch electrically connects the third isolation port 150a to the first isolation port 120b, the second control signal is configured to set the third output terminal 151a of the third coupler 151 to a high isolation mode, so that when the output port of the third RF signal is switched from one of the third connection terminal 150b and the fourth connection terminal 150c to the other, the impedance of the first isolation port 120b remains unchanged.

[0087] In the RF front-end circuit 100 provided in the embodiment of the present application, the RF transceiver 110 is used to send a second control signal, and the second control signal is used to set the third output end 151a of the third coupler 151 to a high isolation mode. Since the third isolation port 150a is electrically connected to the third output end 151a, and the third isolation port 150a is electrically connected to the first isolation port 120b, when the third output end 151a is in a high isolation mode, the impedance of the first isolation port 120b remains unchanged or approximately remains unchanged. When the output port of the third RF signal is switched from one of the third connection end 150b and the fourth connection end 150c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, thereby making the power of the transmission port 120a of the directional coupler 120 outputting the first RF signal stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has good communication performance.

[0088] In one embodiment, the second control signal is used to set the third output end 151a of the third coupler 151 to the high isolation mode before the output port of the third RF signal is switched from one of the third connection end 150b and the fourth connection end 150c to the other.

[0089] In the RF front-end circuit 100 provided in the application embodiment, the second control signal is used to set the third output end 151a of the third coupler 151 to the high isolation mode before the output port of the third RF signal is switched from one of the third connection end 150b and the fourth connection end 150c to the other. Therefore, when the output port of the third RF signal is switched from one of the third connection end 150b and the fourth connection end 150c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, so that the power of the transmission port 120a of the directional coupler 120 outputting the first RF signal remains stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has better communication performance.

[0090] The RF front-end circuit 100 further includes a detection circuit 140. The detection circuit 140 is used to detect the power of the third RF signal to obtain a second detection power. The RF transceiver 110 is also used to send the second control signal when the detection circuit 140 detects the power of the third RF signal.

[0091] In one embodiment, the RF transceiver 110 is used to determine whether it is necessary to switch the output port of the third RF signal according to the second detection power. For example, in one embodiment, when the second detection power is less than or equal to the second preset power, the RF transceiver 110 switches the output port of the third RF signal. For example, when the output port of the third RF signal is the third connection terminal 150b, and the second detection power is less than or equal to the second preset power, the RF transceiver 110 switches the output port of the third RF signal to the fourth connection terminal 150c. When the output port of the third RF signal is the fourth connection terminal 150c, and the second detection power is less than or equal to the second preset power, the RF transceiver 110 switches the output port of the third RF signal to the third connection terminal 150b.

[0092] It can be understood that, in one embodiment, when the second detection power is greater than the second preset power, the RF transceiver 110 keeps the output port of the third RF signal unchanged. For example, when the output port of the third RF signal is the third connection terminal 150b, and the second detection power is greater than the second preset power, the RF transceiver 110 keeps the output port of the third RF signal at the third connection terminal 150b. When the output port of the third RF signal is the fourth connection terminal 150c, and the second detection power is greater than the second preset power, the RF transceiver 110 keeps the output port of the second RF transceiver 110 at the fourth connection terminal 150c.

[0093] In one embodiment, the RF transceiver 110 of the RF front-end circuit 100 is used to send a second power detection signal. The detection circuit 140 is electrically connected to the RF transceiver 110 to receive the second power detection signal, and under the control of the second power detection signal, detects the power of the third RF signal to obtain the second detection power.

[0094] In the RF front-end circuit 100 provided in the embodiment of the present application, when the detection circuit 140 detects the power of the third RF signal, the RF transceiver 110 may switch the output port of the third RF signal according to the second detection power. Therefore, the RF transceiver 110 of the RF front-end circuit 100 provided in the embodiment of the present application sends the second control signal when the detection circuit 140 detects the third RF signal. Therefore, the RF transceiver 110 can send the second control signal before the output port of the third RF signal is switched, and the second control signal sets the first output terminal 131a of the first coupler 131 to the high isolation mode. When the first output terminal 131a is in the high isolation mode, the impedance of the first isolation port 120b remains unchanged or approximately remains unchanged. When the output port of the third RF signal is switched from one of the third connection terminal 150b and the fourth connection terminal 150c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, so that the power of the first RF signal output by the transmission port 120a of the directional coupler 120 remains stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has better communication performance.

[0095] For further information, please refer to Figure 6The second PAMID 150 further comprises a second detection terminal 150d. The second PAMID 150 further comprises a fourth coupler 152. The fourth coupler 152 comprises a fourth output terminal 152a, and the fourth output terminal 152a is electrically connected to the second detection terminal 150d. The detection circuit 140 is electrically connected to the second detection terminal 150d to detect the power of the third RF signal.

[0096] In this embodiment, the second PAMID 150 includes a third coupler 151 and a fourth coupler 152, the third output end 151a of the third coupler 151 is electrically connected to the first isolation port 120b through the third isolation port 150a, and the fourth output end 152a of the fourth coupler 152 is electrically connected to the second detection end 150d. The detection circuit 140 is electrically connected to the fourth output end 152a of the fourth coupler 152 through the second detection end 150d to detect the power of the third RF signal and obtain the second detection power. The RF transceiver 110 is used to send the second control signal when the detection circuit 140 detects the power of the third RF signal to control the third output end 151a of the third coupler 151 to be set to a high isolation mode, so that when the output port of the third RF signal is switched from one of the third connection end 150b and the fourth connection end 150c to the other, the impedance of the first isolation port 120b remains unchanged.

[0097] It can be seen that the structure of the RF front-end circuit 100 provided in the embodiment of the present application is simple and easy to implement, and can well realize the detection of the third RF signal, and set the third output end 151a of the third coupler 151 to a high isolation mode when detecting the power of the third RF signal. When the third output end 151a is in the high isolation mode, the impedance of the first isolation port 120b remains unchanged or approximately remains unchanged. When the output port of the third RF signal is switched from one of the third connection end 150b and the fourth connection end 150c to the other, the impedance of the first isolation port 120b remains unchanged, and the coupling coefficient of the first isolation port 120b remains unchanged, thereby making the power of the transmission port 120a of the directional coupler 120 outputting the first RF signal remain stable, so that the first frequency band generated by the first radiator 210 electrically connected to the output port of the directional coupler 120 has good communication performance.

[0098] For further information, see Figure 6, the switching circuit has a common terminal 160a, a first terminal 160b and a second terminal 160c. The common terminal 160a is electrically connected to the first isolation port 120b. The first terminal 160b is electrically connected to the second isolation port 130a. The second terminal 160c is electrically connected to the third isolation port 150a. The common terminal 160a can be electrically connected to one of the first terminal 160b and the second terminal 160c. When the common terminal 160a is electrically connected to the first terminal 160b, the second isolation port 130a is electrically connected to the first isolation port 120b; when the common terminal 160a is electrically connected to the second terminal 160c, the third isolation port 150a is electrically connected to the first isolation port 120b.

[0099] In this embodiment, the switching circuit has a common terminal 160a, a first terminal 160b and a second terminal 160c. The common terminal 160a is electrically connected to the first isolation port 120b. The first terminal 160b is electrically connected to the second isolation port 130a. The second terminal 160c is electrically connected to the third isolation port 150a. The common terminal 160a can be electrically connected to one of the first terminal 160b and the second terminal 160c. As can be seen, the switching circuit structure is simple and easy to implement.

[0100] Furthermore, the directional coupler 120 also has a coupling port 120c. The detection circuit 140 is also electrically connected to the coupling port 120c, and the detection circuit 140 is used to detect the power of the first radio frequency signal to obtain a third detection power. The radio frequency transceiver 110 is also electrically connected to the detection circuit 140, and is used to control the transmission power of the first radio frequency signal according to the third detection power.

[0101] The detection circuit 140 is further used to detect the power of the first RF signal to obtain a third detection power. The RF transceiver 110 is used to control the transmission power of the first RF signal according to the third detection power, so that the RF front-end circuit 100, the RF transceiver device 10 used by the RF front-end circuit 100 and the electronic device 1 can have better communication performance in the first frequency band.

[0102] In one embodiment, the detection circuit 140 is used to compare the third detection power with a third preset power. When the third detection power is less than the third preset power, the RF transceiver 110 increases the power of the first transmission signal to the third preset power; when the third detection power is greater than or equal to the third preset power, the RF transceiver 110 keeps the power of the first transmission signal unchanged.

[0103] In the RF front-end circuit 100 provided in the embodiment of the present application, the detection circuit 140 is used to compare the third detection power with the third preset power. When the third detection power is less than the third preset power, the RF transceiver 110 increases the power of the first transmission signal to the third preset power; when the third detection power is greater than or equal to the third preset power, the RF transceiver 110 keeps the power of the first transmission signal unchanged; when the power of the first RF signal is small, the power of the first RF signal is increased, so that the RF front-end circuit 100, the RF transceiver device 10 used by the RF front-end circuit 100 and the electronic device 1 have better communication performance in the first frequency band.

[0104] In summary, in the RF front-end circuit 100 provided in one embodiment of the present application, when the detection circuit 140 detects the power of the second RF signal, the RF transceiver 110 sends a first control signal, so that when the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged; even if the RF transceiver 110 switches the output port of the second RF signal according to the first detection power, the impedance of the first isolation port 120b of the directional coupler 120 is fixed, so that when the detection circuit 140 detects the first RF signal to obtain the third detection power, there will be no fluctuation, or there will be a small probability of fluctuation. Thus, the stability of the transmission power of the first RF signal is guaranteed.

[0105] In one embodiment, the RF transceiver 110, the directional coupler 120, the first PAMID 130, the detection circuit 140 and other devices in the RF front-end circuit 100 are hardware devices in the RF front-end circuit 100. The RF front-end circuit 100 provided in the embodiment of the present application does not add any hardware devices. By configuring the electrical connection relationship and control relationship of each device in the RF front-end circuit 100, it is ensured that when the output port of the first PAMID 130 outputting the second RF signal is switched, the impedance of the first isolation port 120b of the directional coupler 120 does not change without increasing the hardware cost, thereby ensuring that the power of the first RF signal output by the directional coupler 120 is stably transmitted.

[0106] It can be seen that the RF front-end circuit 100 provided in the embodiment of the present application does not increase the hardware cost.

[0107] In one embodiment, when the first frequency band is the N41 frequency band and the second frequency band is the B1 frequency band; when the detection circuit 140 detects the power of the second RF signal (also called B1 Tx), it sends a first control signal to the first coupler 131 in the first PAMID 130, and sets the first output end 131a (also called CPL2 port) of the first coupler 131 to a high isolation mode (also called HISO MODE). Even when the output port of the second RF signal is switched, the impedance of the first isolation port 120b of the directional coupler 120 does not change, thereby achieving stable control of the N41 frequency band.

[0108] In one embodiment, the RF transceiver 110 is used to send a first RF signal and a second RF signal. The detection circuit 140 detects the power of the second RF signal (i.e., the transmission power of the second RF signal). Further, the RF transceiver 110 sends a control signal to the first coupler 131 of the first PAMID 130. When it is determined based on the transmission power of the second RF signal that the output port of the first PAMID 130 outputting the second RF signal has not been switched, the control signal does not set the first output end 131a of the first coupler to a high isolation mode; and when the output port of the second RF signal needs to be switched, the control signal is a first control signal, which sets the first output end 131a of the first coupler to a high isolation mode.

[0109] See also Figure 7 , Figure 7 A schematic diagram of a control flow of a radio frequency front-end circuit provided in one embodiment of the present application. The flow includes but is not limited to S110, S120, S130 and S140, which are described in detail as follows.

[0110] S110, detecting the transmission power of the second radio frequency signal;

[0111] S120, generating a first control signal;

[0112] S130, determining whether the output port for outputting the second radio frequency signal of the first PAMID 130 needs to be switched;

[0113] When switching is not required, the process ends; when switching is required, the process proceeds to S140.

[0114] S140, the first control signal is output to the first coupler 131 of the first PAMID 130. The first control signal is used to set the first output end of the first coupler to a high isolation mode, so that when the output port of the second RF signal is switched from one of the first connection end 130b and the second connection end 130c to the other, the impedance of the first isolation port 120b remains unchanged.

[0115] The above is part of the implementation methods of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

Claims

1. A radio frequency front-end circuit, characterized in that: The radio frequency front end circuit comprises: A radio frequency transceiver, configured to send a first radio frequency signal, a second radio frequency signal and a first control signal; A directional coupler having a transmission port and a first isolation port, wherein the transmission port is used to output a first radio frequency signal; A first PAMID, comprising a first coupler, wherein the first coupler has a first output end, the first PAMID has a second isolation port, a first connection end, and a second connection end, wherein the second isolation port is electrically connected to the first output end, and the second isolation port is also used to be electrically connected to the first isolation port, and one of the first connection end and the second connection end is used to output the second radio frequency signal; The first control signal is used to set the first output end of the first coupler to a high isolation mode so that when the output port of the second RF signal is switched from one of the first connection end and the second connection end to the other, the impedance of the first isolation port remains unchanged.

2. The radio frequency front-end circuit according to claim 1, characterized in that: The first control signal is used to set the first output end of the first coupler to the high isolation mode before the output port of the second radio frequency signal is switched from the one of the first connection end and the second connection end to the other.

3. The radio frequency front-end circuit according to claim 2, characterized in that: The radio frequency front end circuit also includes: A detection circuit, wherein the detection circuit is used to detect the power of the second radio frequency signal to obtain a first detection power; The radio frequency transceiver is used for sending the first control signal when the detection circuit detects the power of the second radio frequency signal.

4. The radio frequency front-end circuit according to claim 3, characterized in that: The first PAMID also has a first detection end; the first PAMID also includes: A second coupler, wherein the second coupler has a second output end, and the second output end is electrically connected to the first detection end; The detection circuit is electrically connected to the first detection end to detect the power of the second radio frequency signal.

5. The radio frequency front-end circuit according to claim 1, characterized in that: The radio frequency transceiver is further configured to send a third radio frequency signal, and the radio frequency front-end circuit further comprises: a second PAMID, comprising a third coupler, the third coupler having a third output end, the second PAMID having a third isolation port, a third connection end and a fourth connection end, the third isolation port being electrically connected to the third output end, one of the third connection end and the fourth connection end being used to output the third RF signal; and a switching circuit, the switching circuit being used for switching one of the second isolation port and the third isolation port to be electrically connected to the first isolation port; When the switching circuit is used to electrically connect the second isolation port to the first isolation port, the RF front-end circuit is used to support a first frequency band and a second frequency band, wherein the first RF signal is used to support the first frequency band, and the second RF signal is used to support the second frequency band; When the switching switch circuit is used to electrically connect the third isolation port to the first isolation port, the RF front-end circuit is used to support a first frequency band and a third frequency band, wherein the third RF signal is used to support the third frequency band.

6. The radio frequency front-end circuit according to claim 5, characterized in that: The radio frequency transceiver is also used to generate a second control signal; When the switching switch electrically connects the third isolation port to the first isolation port, the second control signal is used to set the third output end of the third coupler to a high isolation mode, so that when the output port of the third RF signal is switched from one of the third connection end and the fourth connection end to the other, the impedance of the first isolation port remains unchanged.

7. The radio frequency front-end circuit according to claim 6, characterized in that: The second control signal is used to set the third output end of the third coupler to the high isolation mode before the output port of the third RF signal is switched from one of the third connection end and the fourth connection end to the other.

8. The radio frequency front-end circuit according to claim 6, characterized in that: The radio frequency front end circuit also includes: A detection circuit, wherein the detection circuit is used to detect the power of the third radio frequency signal to obtain a second detection power; The radio frequency transceiver is further configured to send the second control signal when the detection circuit detects the power of the third radio frequency signal.

9. The radio frequency front-end circuit according to claim 8, characterized in that: The second PAMID also has a second detection end; The second PAMID also includes: a fourth coupler, the fourth coupler having a fourth output terminal, the fourth output terminal being electrically connected to the second detection terminal; Wherein, the detection circuit is electrically connected to the second detection end to detect the power of the third radio frequency signal.

10. The radio frequency front-end circuit according to claim 5, characterized in that: The switching circuit has: a common terminal, the common terminal being electrically connected to the first isolation port; a first terminal electrically connected to the second isolation port; and a second terminal electrically connected to the third isolation port; The common terminal can be electrically connected to one of the first terminal and the second terminal. When the common terminal is electrically connected to the first terminal, the second isolation port is electrically connected to the first isolation port; when the common terminal is electrically connected to the second terminal, the third isolation port is electrically connected to the first isolation port.

11. The radio frequency front-end circuit according to claim 3 or 8, characterized in that: The directional coupler also has a coupling port; The detection circuit is also electrically connected to the coupling port, and the detection circuit is used to detect the power of the first radio frequency signal to obtain a third detection power; The radio frequency transceiver is also electrically connected to the detection circuit, and is used to control the transmission power of the first radio frequency signal according to the third detection power.

12. A radio frequency transceiver, characterized in that: The radio frequency transceiver comprises: The first radiator; The second radiator; a third radiator, the position of the third radiator being different from the position of the second radiator; and The radio frequency front-end circuit according to any one of claims 1 to 11; The transmission port is electrically connected to the first radiator, the first connection end is electrically connected to the second radiator, and the second connection end is electrically connected to the third radiator.

13. An electronic device, characterized in that: The electronic device comprises the radio frequency transceiver as claimed in claim 12.

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