Radio frequency circuit, electronic equipment and power detection method

Abstract

The invention discloses a radio frequency circuit, electronic equipment and a power detection method, and belongs to the technical field of electronics. The radio frequency circuit comprises a radio frequency transceiver and an antenna; the power transmitting path is connected with the radio frequency transceiver; the first coupling path and the second coupling path are connected between the power transmitting path and the antenna and are used for coupling the power transmitting signals of the power transmitting path to respectively obtain a first signal and a second signal; the power detection path comprises a phase shifter and an adder, the phase shifter is connected with the second coupling path and used for performing phase shifting processing on the second signal according to the target phase difference between the first coupling path and the second coupling path to obtain a third signal, and the adder is connected with the radio frequency transceiver, the first coupling path and the phase shifter and used for performing phase shifting processing on the second signal according to the target phase difference between the first coupling path and the second coupling path. And the superposition module is used for superposing the first signal and the third signal to obtain a fourth signal and inputting the fourth signal into the radio frequency transceiver, and the radio frequency transceiver is used for determining a first power value of the power transmitting signal according to the fourth signal.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and specifically relates to a radio frequency circuit, an electronic device and a power detection method. Background Art

[0002] Even with the rapid development of communication technology, electronic devices still have problems with weak signals or complete signal loss in scenarios such as mountainous areas, basements, or remote areas. In order to improve the coverage and transmission rate of electronic devices, it is necessary to increase the uplink transmission power of electronic devices. However, there is an upper limit to the PA (Power Amplifier) ​​transmission power, and exceeding the maximum power allowed by the PA may cause the PA to be damaged. Therefore, it is necessary to detect the PA transmission power.

[0003] At present, the commonly used power detection method is to add a coupler at the output end of the PA, and detect the size of the PA transmission power by the size of the coupler coupling energy. However, due to the limitations of antenna size and wide frequency band, the VSWR (Voltage Standing Wave Ratio) of the antenna of current electronic equipment often cannot be within 3:1, that is, the antenna is mismatched, which will cause the coupling coefficient of the coupler to fluctuate with the antenna phase fluctuation.

[0004] In this way, the detection accuracy of the traditional power detection method is low, which may cause two problems: ① The PA transmission power of the antenna load at a specific phase is reduced, resulting in a decrease in the total radiated power (TRP) of the entire device, which is an important parameter in wireless communication systems and is usually used to evaluate the performance of antennas. A higher TRP means that the antenna can convert more input power into radiated power. This reduces the coverage and throughput of electronic equipment; ② The PA transmission power of the antenna load at a specific phase increases, so that it exceeds the maximum power allowed by the PA, thereby causing damage to the PA. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a radio frequency circuit, an electronic device and a power detection method, which can improve the detection accuracy of power detection, avoid the problem of PA transmission power reduction or PA transmission power exceeding the reliability upper limit, and extend the service life of the PA while ensuring the coverage and throughput of the electronic device.

[0006] In a first aspect, an embodiment of the present application provides a radio frequency circuit, including: a radio frequency transceiver and an antenna; a power transmission path connected to the radio frequency transceiver; a first coupling path and a second coupling path connected between the power transmission path and the antenna, where the first coupling path and the second coupling path are used to couple the power transmission signal of the power transmission path to obtain a first signal and a second signal respectively; a power detection path including a phase shifter and an adder, the phase shifter is connected to the second coupling path, the phase shifter is used to perform a phase shift process on the second signal according to a target phase difference between the first coupling path and the second coupling path to obtain a third signal, the adder is connected to the radio frequency transceiver, the first coupling path and the phase shifter, the adder is used to superimpose the first signal and the third signal to obtain a fourth signal, and input the fourth signal into the radio frequency transceiver, and the radio frequency transceiver is used to determine a first power value of the power transmission signal according to the fourth signal.

[0007] In a second aspect, an embodiment of the present application provides an electronic device, including: the radio frequency circuit of the first aspect.

[0008] In a third aspect, an embodiment of the present application provides a power detection method, which is applied to the electronic device of the second aspect. The power detection method includes: respectively performing a first coupling process and a second coupling process on the power transmission signal to obtain a first signal and a second signal; determining a target phase difference according to the power transmission signal, the first signal and the second signal; performing a phase shift process on the second signal according to the target phase difference to obtain a third signal; superimposing the first signal and the third signal to obtain a fourth signal; and determining a first power value of the power transmission signal according to the fourth signal.

[0009] The radio frequency circuit provided by the embodiment of the present application includes a radio frequency transceiver, an antenna, a power transmission path, a first coupling path, a second coupling path, and a power detection path. The power detection path includes a phase shifter and an adder. The power transmission path is connected to the radio frequency transceiver; the first coupling path and the second coupling path are connected between the power transmission path and the antenna. The first coupling path and the second coupling path are used to couple the power transmission signal of the power transmission path to obtain a first signal and a second signal respectively; the phase shifter is connected to the second coupling path. The phase shifter is used to perform a phase shift process on the second signal according to the target phase difference between the first coupling path and the second coupling path to obtain a third signal. The adder is connected to the radio frequency transceiver, the first coupling path, and the phase shifter. The adder is used to superimpose the first signal and the third signal to obtain a fourth signal, and input the fourth signal into the radio frequency transceiver. The radio frequency transceiver is used to determine the first power value of the power transmission signal according to the fourth signal. In the above radio frequency circuit, the signals reflected back due to the mismatch of the antenna are detected through two coupling paths. By shifting the phase of one of the detected signals obtained by coupling and then superimposing it with the other detected signal obtained by coupling, the final detected signal after eliminating the coupling coefficient fluctuation caused by the antenna mismatch is obtained, and power detection is performed. In this way, the influence of the antenna mismatch on the power detection result is eliminated, the detection accuracy of the power detection is improved, the problem that the PA transmission power decreases or the PA transmission power exceeds the reliability upper limit can be avoided, and while ensuring the coverage rate and throughput of the electronic device, the service life of the PA is extended. Description of the Drawings

[0010] Figure 1 One of the structural schematic diagrams of the radio frequency circuit provided by the embodiment of the present application;

[0011] Figure 2 Another structural schematic diagram of the radio frequency circuit provided by the embodiment of the present application;

[0012] Figure 3 One of the relationship curves of the antenna phase and the coupling coefficient provided by the embodiment of the present application;

[0013] Figure 4 Another relationship curve of the antenna phase and the coupling coefficient provided by the embodiment of the present application;

[0014] Figure 5 Another relationship curve of the antenna phase and the coupling coefficient provided by the embodiment of the present application;

[0015] Figure 6 One of the working flowcharts of the radio frequency circuit provided by the embodiment of the present application;

[0016] Figure 7 Another working flowchart of the radio frequency circuit provided by the embodiment of the present application;

[0017] Figure 8 It is a block diagram of an electronic device provided by an embodiment of the present application;

[0018] Figure 9 It is a schematic flowchart of a power detection method provided by an embodiment of the present application.

[0019] Reference numerals:

[0020] 100 Radio frequency circuit, 102 First coupling path, 104 Second coupling path, 106 Power detection path, 108 Phase shifter, 110 Adder, 112 First coupler, 114 First switch, 116 Second coupler, 118 Second switch, 120 Radio frequency transceiver, 122 Antenna, 124 Power transmission path, 126 Power reception path, 128 Power amplifier, 130 Duplexer, 132 Low noise amplifier. Detailed implementation manners

[0021] Hereinafter, embodiments of the present application will be described in detail. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0022] The terms "first" and "second" in the specification and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "plurality" is two or more.

[0023] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0024] Hereinafter, in combination with Figures 1-9 A detailed description will be given of a radio frequency circuit, an electronic device, and a power detection method according to an embodiment of the present application.

[0025] As Figure 1As shown in the figure, an embodiment of the present application provides a radio frequency circuit 100. Among them, the radio frequency circuit 100 includes a radio frequency transceiver 120, an antenna 122, a power transmission path 124, a first coupling path 102, a second coupling path 104, and a power detection path 106.

[0026] Among them, the power transmission path 124 is connected to the radio frequency transceiver 120.

[0027] Further, the first coupling path 102 and the second coupling path 104 are connected between the power transmission path 124 and the antenna 122.

[0028] Further, the power detection path 106 is connected to the first coupling path 102, the second coupling path 104, and the radio frequency transceiver 120.

[0029] In the actual application process, as Figure 1 shown, the radio frequency transceiver 120 may specifically include a TX (Transmit) port, an RX (Receive) port, and an FBRX (Feedback Receive) port. The FBRX port is a power detection port.

[0030] Further, the power transmission path 124 is connected to the TX port of the radio frequency transceiver 120. The power transmission path 124 may specifically include a power amplifier 128, i.e., a PA, and a duplexer 130. Among them, the duplexer 130 is connected to the output end of the power amplifier 128. When the radio frequency transceiver 120 works, the original power signal is transmitted from the TX port, the original power signal is power-amplified by the power amplifier 128, and the out-of-band signal is filtered by the duplexer 130.

[0031] Further, the first coupling path 102 is used to couple the power transmission signal of the power transmission path 124 to obtain a first signal.

[0032] Among them, it can be understood that during the coupling of the power transmission signal by the first coupling path 102, due to the large VSWR of the antenna 122, there is signal reflection in the antenna 122, resulting in the coupling coefficient of the first coupling path 102 being affected by the VSWR of the antenna 122 and the phase of the antenna 122. There will be a sine function relationship between the coupling coefficient of the first coupling path 102 and the phase of the antenna 122, as Figure 3 shown, thus resulting in power mismatch.

[0033] Further, the second coupling path 104 is used to couple the power transmission signal of the power transmission path 124 to obtain a second signal.

[0034] Similarly, during the process of the second coupling path 104 coupling the power transmission signal, there is also a sine function relationship between the coupling coefficient of the second coupling path 104 and the phase of the antenna 122.

[0035] Furthermore, the power detection path 106 includes a phase shifter 108 and an adder 110.

[0036] Among them, the phase shifter 108 is connected to the second coupling path 104.

[0037] Furthermore, the adder 110 is connected to the FBRX port of the radio frequency transceiver 120, the first coupling path 102, and the phase shifter 108.

[0038] Furthermore, when both the first coupling path 102 and the second coupling path 104 are turned on, the phase shifter 108 is used to perform a phase shift process on the second signal coupled by the second coupling path 104 according to the target phase difference between the first coupling path 102 and the second coupling path 104, obtain a third signal, and input the third signal into the adder 110. Among them, the third signal is the reverse signal of the first signal, as Figure 4 shown.

[0039] Furthermore, the adder 110 is used to superimpose the first signal and the third signal to obtain a fourth signal. Since the third signal is the reverse signal of the first signal, the fourth signal obtained by superimposing the first signal and the third signal has eliminated the coupling coefficient fluctuation caused by the mismatch of the antenna 122, as Figure 5 shown. On this basis, the adder 110 inputs the fourth signal into the FBRX port of the radio frequency transceiver 120, and the radio frequency transceiver 120 then performs power detection on the power transmission signal according to the fourth signal after eliminating the coupling coefficient fluctuation, and obtains the first power value of the current power transmission signal. In this way, during the power detection process, the coupling coefficient is stable, which can ensure that the PA transmission power detected under any VSWR is constant, guarantee the accuracy of power detection, and thus enable the electronic device to ensure the constancy of the PA transmission power under different antenna 122 states. On the one hand, it can avoid the problem that the PA transmission power decreases when the antenna 122 phase falls on a specific phase, resulting in a decrease in the overall machine TRP, and improve the coverage rate and throughput of the electronic device; on the other hand, it can avoid the problem that the PA transmission power increases when the antenna 122 phase falls on a specific phase, resulting in the PA transmission power exceeding the actual reliability upper limit, and avoid the problem of PA burnout and the possible networkless problem of the electronic device after PA burnout.

[0040] In the actual application process, the above radio frequency circuit 100 is not limited to solving the problem of antenna power mismatch, but can also be used to improve the problem of receiving level mismatch to ensure accurate reported level and more reasonable base station scheduling and resource allocation.

[0041] The radio frequency circuit 100 according to an embodiment of the present application includes a radio frequency transceiver 120, an antenna 122, a power transmission path 124, a first coupling path 102, a second coupling path 104, and a power detection path 106. The power transmission path 124 is connected to the radio frequency transceiver 120; the first coupling path 102 and the second coupling path 104 are connected between the power transmission path 124 and the antenna 122, and the first coupling path 102 and the second coupling path 104 are used to couple the power transmission signal of the power transmission path 124 to obtain a first signal and a second signal respectively; the power detection path 106 includes a phase shifter 108 and an adder 110. The phase shifter 108 is connected to the second coupling path 104, and the phase shifter 108 is used to perform a phase shift process on the second signal according to the target phase difference between the first coupling path 102 and the second coupling path 104 to obtain a third signal. The adder 110 is connected to the radio frequency transceiver 120, the first coupling path 102, and the phase shifter 108. The adder 110 is used to superimpose the first signal and the third signal to obtain a fourth signal, and input the fourth signal into the radio frequency transceiver 120. The radio frequency transceiver 120 is used to determine the first power value of the power transmission signal according to the fourth signal. In the above radio frequency circuit 100, the signals reflected back due to the mismatch of the antenna 122 are detected through two coupling paths. By shifting the phase of one of the detected signals obtained by coupling and then superimposing it with the other detected signal obtained by coupling, the final detected signal after eliminating the coupling coefficient fluctuation caused by the mismatch of the antenna 122 is obtained, and power detection is performed. In this way, the influence of the antenna 122 mismatch on the power detection result is eliminated, the detection accuracy of the power detection is improved, the problems of PA transmit power reduction or PA transmit power exceeding the reliability upper limit can be avoided, and while ensuring the coverage rate and throughput of the electronic device, the service life of the PA is extended.

[0042] According to some embodiments of the present application, optionally, as Figure 1 shown, when both the first coupling path 102 and the second coupling path 104 are turned on, the phase shift value of the phase shifter 108 is set to (180° - target phase difference).

[0043] In this way, the third signal obtained after the phase shift process is opposite to the first signal.

[0044] On this basis, the adder 110 superimposes the first signal and the third signal again, so as to eliminate the coupling coefficient fluctuation caused by the mismatch of the antenna 122, obtain a fourth signal, and input the fourth signal into the FBRX port of the radio frequency transceiver 120.

[0045] For the radio frequency circuit 100 according to the embodiments of the present application, when both the first coupling path 102 and the second coupling path 104 are conducting, the phase shift value of the phase shifter 108 is set to (180° - target phase difference). In this way, the third signal can be made to be in the opposite direction to the first signal, and the fourth signal obtained by superimposing the first signal and the third signal eliminates the coupling coefficient fluctuation caused by the mismatch of the antenna 122, ensuring the accuracy of power detection based on the fourth signal, thereby avoiding the problems of reduced PA transmit power or PA transmit power exceeding the reliability upper limit, while ensuring the coverage and throughput of the electronic device and extending the service life of the PA.

[0046] According to some embodiments of the present application, optionally, as Figure 1 shown, the first coupling path 102 includes a first coupler 112 and a first switch 114.

[0047] Wherein, the first switch 114 is connected to both the first coupler 112 and the adder 110.

[0048] Further, the first coupler 112 is configured to couple the power transmission signal to obtain a first signal.

[0049] Further, the first switch 114 is configured to control whether the first coupling path 102 is conducting. When the first switch 114 is off, the first coupling path 102 is in an open state, and when the first switch 114 is on, the first coupling path 102 is in a conducting state.

[0050] Further, the second coupling path 104 includes a second coupler 116 and a second switch 118.

[0051] Wherein, the second coupler 116 is connected to the first coupler 112.

[0052] Further, the second switch 118 is connected to both the second coupler 116 and the phase shifter 108.

[0053] Further, the second coupler 116 is configured to couple the power transmission signal to obtain a second signal.

[0054] Further, the second switch 118 is configured to control whether the second coupling path 104 is conducting. When the second switch 118 is off, the second coupling path 104 is in an open state, and when the second switch 118 is on, the second coupling path 104 is in a conducting state.

[0055] According to the radio frequency circuit 100 of the embodiments of the present application, the first coupling path 102 includes: a first coupler 112; a first switch 114 connected to both the first coupler 112 and the adder 110; the second coupling path 104 includes: a second coupler 116 connected to the first coupler 112; a second switch 118 connected to both the second coupler 116 and the phase shifter 108. In this way, by switching the on-off state of the switch to switch the on-off state of the corresponding coupling path, independent control and combined control of the two coupling paths can be achieved.

[0056] According to some embodiments of the present application, optionally, when only the second coupling path 104 is turned on, the phase shift value of the phase shifter 108 is set to 0°.

[0057] That is, when the first switch 114 is open and the second switch 118 is closed, that is, when power detection is performed only based on the second coupler 116, the phase shifter 108 does not process the second signal coupled by the second coupler 116, but directly transmits the second signal to the adder 110.

[0058] On this basis, the adder 110 is further configured to: when only the first coupling path 102 is turned on, that is, when the first switch 114 is closed and the second switch 118 is open, that is, when power detection is performed only based on the first coupler 112, only receive the first signal coupled by the first coupler 112 and input the first signal into the FBRX port of the radio frequency transceiver 120. Further, when only the second coupling path 104 is turned on, only receive the second signal coupled by the second coupler 116 and input the second signal into the FBRX port of the radio frequency transceiver 120.

[0059] Further, the radio frequency transceiver 120 is further configured to: determine a first phase difference according to the phase difference between the first signal and the power transmission signal, determine a second phase difference according to the phase difference between the second signal and the power transmission signal, and determine a target phase difference according to the difference between the first phase difference and the second phase difference.

[0060] That is, based on the radio frequency circuit 100 provided in the embodiments of the present application, the radio frequency transceiver 120 realizes a phase self-check function, and the specific process is as follows: The TX port of the radio frequency transceiver 120 transmits an original power signal, and the power amplifier 128 outputs a power transmission signal f0; the first switch 114 is turned on, the second switch 118 is turned off, and the first coupling path 102 starts to work. The first signal f1 coupled by the first coupler 112 enters the radio frequency transceiver 120 through the power detection path 106, and the radio frequency transceiver 120 obtains the first phase difference φ1 between the first signal f1 and the power transmission signal f0; the first switch 114 is turned off, and the second switch 118 is turned on. The second coupling path 104 starts to work. The second coupler 116 couples to the second signal f2. The phase shift value of the phase shifter 108 is set to 0°. The second signal f2 enters the radio frequency transceiver 120 through the power detection path 106. The radio frequency transceiver 120 obtains the second phase difference φ2 between the second signal f2 and the power transmission signal f0, and calculates the phase difference between the first signal f1 and the second signal f2, that is, the target phase difference Δφ = φ1 - φ2.

[0061] According to the radio frequency circuit 100 of the embodiments of the present application, when only the second coupling path 104 is turned on, the phase shift value of the phase shifter 108 is set to 0°; the adder 110 is further configured to: when only the first coupling path 102 is turned on, input the first signal into the radio frequency transceiver 120; when only the second coupling path 104 is turned on, input the second signal into the radio frequency transceiver 120; the radio frequency transceiver 120 is further configured to: determine the first phase difference according to the first signal and the power transmission signal; determine the second phase difference according to the second signal and the power transmission signal; determine the target phase difference according to the first phase difference and the second phase difference. In this way, by switching the on / off states of the two coupling paths, the radio frequency transceiver 120 realizes the phase self-check function, can detect the phase difference between the two couplers in any working frequency range in real time, ensure the accuracy of the superimposed signal, and thus ensure the accuracy of power detection.

[0062] According to some embodiments of the present application, optionally, as Figure 1 shown, the first coupler 112 and the second coupler 116 are connected in parallel.

[0063] Specifically, as Figure 1 shown, the first end of the first coupler 112 is connected to the power transmission path 124, the second end of the first coupler 112 is connected to the first end of the second coupler 116, and the second end of the second coupler 116 is connected to the antenna 122.

[0064] According to some embodiments of the present application, optionally, as Figure 2 shown, the first coupler 112 and the second coupler 116 are connected in parallel.

[0065] That is, asFigure 2 As shown, the first coupler 112 is connected to both the power transmission path 124 and the antenna 122, and the second coupler 116 is connected to both the power transmission path 124 and the antenna 122. Specifically, the first end of the first coupler 112 and the first end of the second coupler 116 are both connected to the power transmission path 124, and the second end of the first coupler 112 and the second end of the second coupler 116 are both connected to the antenna 122.

[0066] In actual application processes, such as Figure 2 As shown, the power transmission path 124 is also connected to the power reception path 126, and the power reception path 126 is connected to the RX port of the radio frequency transceiver 120.

[0067] By setting the first coupler 112 and the second coupler 116 in parallel, the number of couplers between the power transmission path 124 and the power reception path 126 and the antenna 122 can be reduced, thereby reducing the losses of the power transmission path 124 and the power reception path 126 and improving the reception performance and transmission performance of the whole machine.

[0068] Among them, the power reception path 126 may specifically include a low noise amplifier 132, that is, an LNA (Low Noise Amplifier).

[0069] According to the radio frequency circuit 100 of the embodiment of the present application, the first coupler 112 and the second coupler 116 are connected in parallel: the first end of the first coupler 112 and the first end of the second coupler 116 are both connected to the power transmission path 124, and the second end of the first coupler 112 and the second end of the second coupler 116 are both connected to the antenna 122. In this way, the number of couplers between the power transceiver path and the antenna 122 is reduced, thereby reducing the losses of the power transceiver path and improving the transceiver performance of the whole machine.

[0070] According to some embodiments of the present application, optionally, the first coupling path 102 is always turned on. When the second power value of the power transmission signal determined only through the first coupling path 102 is greater than a preset threshold, the second coupling path 104 is turned on.

[0071] Among them, when the second power value of the power transmission signal is greater than the preset threshold, it indicates that the electronic device is in a weak network environment and has a high power requirement, that is, it indicates that the power amplifier 128 is in a high-power transmission state.

[0072] During the process of power detection by the radio frequency circuit 100 according to the embodiments of the present application, when starting the detection, the first switch 114 is turned on and the second switch 118 is turned off to only turn on the first coupling path 102, perform power detection only based on the first coupler 112, and obtain the second power value of the current power transmission signal. Further, keep the first switch 114 turned on. When the second power value is greater than the preset threshold, that is, when the power amplifier 128 is in the high-power transmission state, then turn on the second switch 118 to turn on the second coupling path 104, and perform power detection based on the first coupler 112 and the second coupler 116 at the same time to obtain the first power value of the power transmission signal.

[0073] Wherein, for the specific value of the above-mentioned preset threshold, those skilled in the art can set it according to the actual situation, and no specific limitation is made here.

[0074] According to the radio frequency circuit 100 of the embodiments of the present application, the first coupling path 102 is always turned on. When the second power value of the power transmission signal determined only through the first coupling path 102 is greater than the preset threshold, the second coupling path 104 is turned on. In this way, when the power amplifier 128 is in the high-power transmission state, the second coupler 116 is further enabled for joint power detection to optimize the antenna 122 mismatch problem. On the one hand, it ensures the accuracy of the PA transmission power in the high-power transmission state, avoids the problem that the PA transmission power decreases or the PA transmission power exceeds the reliability upper limit in the weak network situation, and improves the communication ability of the electronic device. On the other hand, it reduces the working power consumption of the electronic device.

[0075] In summary, as Figure 6 shown, the working process of the radio frequency circuit 100 provided by the embodiments of the present application may specifically include the following S702 to S716:

[0076] S702: Set a preset threshold P0.

[0077] S704: The first switch is turned on, the second switch is turned off, and power is detected based on the first coupler to obtain the first signal f1.

[0078] S706: Based on the first coupler, power is detected to obtain the second power value P1.

[0079] S708: Judge: P1 > P0. If yes, execute S710. If not, execute S704.

[0080] S710: Obtain the target phase difference Δφ between the first coupler and the second coupler.

[0081] S712: The second switch is turned on, and the second coupler detects the second signal f2.

[0082] S714: The phase shifter shifts the phase of the second signal f2 by (180° - Δφ) to obtain a third signal f3.

[0083] S716: The adder superimposes the first signal f1 and the third signal f3 to obtain a fourth signal f4 with the fluctuation of the coupling coefficient eliminated.

[0084] Among them, as Figure 7 shown, for the target phase difference ΔΦ, it can be specifically obtained through S602 to S616 as follows:

[0085] S602: Detect the operating frequency range of the PA.

[0086] S604: The PA transmits a signal f0 at the transmission power.

[0087] S606: The first switch is turned on, the second switch is turned off, and the first coupler detects the first signal f1.

[0088] S608: Calculate the first phase difference φ1 between the power transmission signal f0 and the first signal f1.

[0089] S610: The first switch is turned off, the second switch is turned on, the phase shift value of the phase shifter is set to 0, and the second coupler detects the second signal f2.

[0090] S612: Calculate the second phase difference φ2 between the power transmission signal f0 and the second signal f2.

[0091] S614: Calculate the target phase difference Δφ = φ1 - φ2 between the first coupler and the second coupler.

[0092] S616: Judgment: It is detected that the operating frequency of the PA has changed. If so, execute S602; if not, end the process.

[0093] According to some embodiments of the present application, optionally, as Figure 8 shown, the embodiments of the present application further provide an electronic device 200. Among them, the electronic device 200 includes the radio frequency circuit 100 in the above embodiments. The electronic device 200 provided by the embodiments of the present application includes the radio frequency circuit 100 in any of the above embodiments and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0094] It should be noted that the electronic device 200 in the embodiments of the present application includes mobile electronic devices and non-mobile electronic devices.

[0095] In the actual application process, the electronic device 200 can be a terminal or other devices other than the terminal. Exemplarily, the electronic device 200 can be a mobile phone, a tablet computer, a laptop computer, a handheld computer, a vehicle-mounted electronic device, a Mobile Internet Device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA), etc. It can also be a server, a Network Attached Storage (NAS), a personal computer (PC), a television (TV), a teller machine, or a self-service machine, etc. The embodiments of the present application do not make specific limitations.

[0096] According to some embodiments of the present application, optionally, as Figure 9 shown, the embodiments of the present application further provide a power detection method, which is applied to the electronic device in the above embodiments. The method may include the following S402 to S410:

[0097] S402: Perform first coupling processing and second coupling processing on the power transmission signal respectively to obtain a first signal and a second signal.

[0098] Among them, the first coupling processing is implemented by a first coupling path, and the second coupling processing is implemented by a second coupling path.

[0099] Specifically, in the power detection method provided by the embodiments of the present application, during the process of performing power detection on the power transmission signal, the electronic device performs first coupling processing on the power transmission signal through the first coupling path to obtain a first signal, and performs second coupling processing on the power transmission signal through the second coupling path to obtain a second signal.

[0100] S404: Determine a target phase difference according to the power transmission signal, the first signal, and the second signal.

[0101] Among them, the target phase difference is the phase difference between the first coupling path and the second coupling path for signal coupling.

[0102] Specifically, in the power detection method provided by the embodiments of the present application, after the first signal and the second signal are coupled, the target phase difference between the first coupling path and the second coupling path will also be determined according to the power transmission signal, the first signal, and the second signal.

[0103] S406: Perform a phase shift process on the second signal according to the target phase difference to obtain a third signal.

[0104] Among them, the third signal is the reverse signal of the first signal.

[0105] Specifically, in the power detection method provided by the embodiments of the present application, after determining the target phase difference, perform a phase shift process on the second signal according to the target phase difference to obtain a third signal that is reverse to the first signal.

[0106] S408: Superimpose the first signal and the third signal to obtain a fourth signal.

[0107] It can be understood that during the signal coupling process, due to the large VSWR of the antenna, signal reflection exists in the antenna, resulting in the coupling coefficient being affected by the VSWR of the antenna and the antenna phase. There will be a sine function relationship between the coupling coefficient and the antenna phase, thus leading to power mismatch.

[0108] In the power detection method provided by the embodiments of the present application, after obtaining the third signal that is reverse to the first signal, by superimposing the first signal and the third signal, the coupling coefficient fluctuation caused by antenna mismatch can be eliminated, thereby obtaining a fourth signal without coupling coefficient fluctuation.

[0109] S410: Determine the first power value of the power transmission signal according to the fourth signal.

[0110] Specifically, in the power detection method provided by the embodiments of the present application, after obtaining the fourth signal without coupling coefficient fluctuation, perform power detection according to the fourth signal to obtain the accurate first power value of the power transmission signal.

[0111] The above power detection method provided by the embodiments of the present application respectively performs a first coupling process and a second coupling process on the power transmission signal to obtain a first signal and a second signal; determines the target phase difference according to the power transmission signal, the first signal, and the second signal; performs a phase shift process on the second signal according to the target phase difference to obtain a third signal; superimposes the first signal and the third signal to obtain a fourth signal; determines the first power value of the power transmission signal according to the fourth signal. The above power detection method detects the signal reflected due to mismatch of the antenna through two coupling paths. By shifting the phase of one detected signal obtained by coupling and then superimposing it with the other detected signal obtained by coupling, the final detected signal after eliminating the coupling coefficient fluctuation caused by antenna mismatch is obtained, and power detection is performed. In this way, the influence of antenna mismatch on the power detection result is eliminated, the detection accuracy of power detection is improved, the problems of PA transmission power reduction or PA transmission power exceeding the reliability upper limit can be avoided, and while ensuring the coverage rate and throughput of the electronic device, the service life of the PA is extended.

[0112] In the embodiment of the present application, the phase shift value for phase shift processing is (180° - target phase difference).

[0113] That is, in the power detection method provided in the embodiment of the present application, after determining the target phase difference, the second signal is subjected to phase shift processing with (180° - target phase difference) as the phase shift value to obtain a third signal that is opposite to the first signal.

[0114] In the above embodiment provided by the present application, the phase shift value for phase shift processing is (180° - target phase difference). In this way, the third signal can be made opposite to the first signal, and the fourth signal obtained by superimposing the first signal and the third signal eliminates the coupling coefficient fluctuation caused by antenna mismatch, ensuring the accuracy of power detection based on the fourth signal.

[0115] In the embodiment of the present application, S404 above may specifically include S404a to S404c below:

[0116] S404a: Determine the first phase difference according to the first signal and the power transmission signal.

[0117] Among them, the first phase difference is determined by the phase difference value between the first signal and the power transmission signal.

[0118] S404b: Determine the second phase difference according to the second signal and the power transmission signal.

[0119] Among them, the second phase difference is determined by the phase difference value between the second signal and the power transmission signal.

[0120] S404c: Determine the target phase difference according to the first phase difference and the second phase difference.

[0121] Among them, the target phase difference is the difference between the first phase difference and the second phase difference, and the target phase difference is the phase difference value between the first signal and the second signal.

[0122] Specifically, in the power detection method provided in the embodiment of the present application, after coupling the first signal and the second signal, the first phase difference is determined according to the phase difference value between the first signal and the power transmission signal, the second phase difference is determined according to the phase difference value between the second signal and the power transmission signal, and then the target phase difference is determined according to the difference between the first phase difference and the second phase difference.

[0123] In the above embodiments provided by the present application, in the process of determining the target phase difference according to the power transmission signal, the first signal, and the second signal, the first phase difference is determined according to the first signal and the power transmission signal; the second phase difference is determined according to the second signal and the power transmission signal; and the target phase difference is determined according to the first phase difference and the second phase difference. In this way, the phase self-check function is realized, and the phase difference between two coupling paths within any operating frequency range can be detected in real time, ensuring the accuracy of the superimposed signal, and thus ensuring the accuracy of power detection.

[0124] In the embodiments of the present application, the above S402 may specifically include the following S402a to S402c:

[0125] S402a: Perform a first coupling process on the power transmission signal to obtain a first signal.

[0126] Specifically, in the power detection method provided by the embodiments of the present application, at the beginning of detection, only the first coupling path is turned on, that is, power detection is performed only through the first coupling path. At this time, the first coupling path performs a first coupling process on the power transmission signal to obtain a first signal.

[0127] S402b: Determine the second power value of the power transmission signal according to the first signal.

[0128] Specifically, in the power detection method provided by the embodiments of the present application, in the case of performing power detection only through the first coupling path, after obtaining the first signal, power detection is directly performed according to the first signal, and the second power value of the current power transmission signal is obtained.

[0129] S402c: When the second power value is greater than a preset threshold, perform a second coupling process on the power transmission signal to obtain a second signal.

[0130] Specifically, in the power detection method provided by the embodiments of the present application, when the second power value of the power transmission signal detected only through the first coupling path is greater than the preset threshold, it indicates that the electronic device is in a weak network environment and has a high power demand, that is, it indicates that the power amplifier is in a high-power transmission state. At this time, the second coupling path is turned on again, and the second coupling path performs a second coupling process on the power transmission signal to obtain a second signal, so as to perform power detection by combining the first signal and the second signal.

[0131] Wherein, for the specific value of the above preset threshold, those skilled in the art can set it according to the actual situation, and no specific limitation is made here.

[0132] In the above embodiments provided by the present application, the power transmission signal is subjected to a first coupling process to obtain a first signal; the second power value of the power transmission signal is determined according to the first signal; and when the second power value is greater than a preset threshold, the power transmission signal is subjected to a second coupling process to obtain a second signal. In this way, when the power amplifier is in a high-power transmission state, the second coupling path is enabled for joint power detection to optimize the antenna mismatch problem. On the one hand, the accuracy of the PA transmission power is ensured in the high-power transmission state, avoiding the problems of reduced PA transmission power or PA transmission power exceeding the reliability upper limit in a weak network situation, and improving the communication ability of the electronic device. On the other hand, the working power consumption of the electronic device is reduced.

[0133] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0134] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A radio frequency circuit, characterized in that: include: RF transceivers and antennas; A power transmission path connected to the radio frequency transceiver; A first coupling path and a second coupling path, wherein the first coupling path and the second coupling path are connected between the power transmission path and the antenna, and the first coupling path and the second coupling path are used to couple the power transmission signal of the power transmission path to obtain a first signal and a second signal respectively; A power detection path includes a phase shifter and an adder, wherein the phase shifter is connected to the second coupling path, and the phase shifter is used to perform phase shift processing on the second signal according to a target phase difference between the first coupling path and the second coupling path to obtain a third signal. The adder is connected to the RF transceiver, the first coupling path and the phase shifter, and the adder is used to superimpose the first signal and the third signal to obtain a fourth signal, and input the fourth signal into the RF transceiver, and the RF transceiver is used to determine a first power value of the power transmission signal according to the fourth signal.

2. The radio frequency circuit according to claim 1, characterized in that: When both the first coupling path and the second coupling path are turned on, the phase shift value of the phase shifter is set to (180°-target phase difference).

3. The radio frequency circuit according to claim 1, characterized in that: When only the second coupling path is turned on, the phase shift value of the phase shifter is set to 0°; The adder is also used to: When only the first coupling path is turned on, inputting the first signal into the radio frequency transceiver; When only the second coupling path is turned on, inputting the second signal into the radio frequency transceiver; The radio frequency transceiver is also used for: determining a first phase difference according to the first signal and the power transmission signal; determining a second phase difference according to the second signal and the power transmission signal; The target phase difference is determined according to the first phase difference and the second phase difference.

4. The radio frequency circuit according to claim 1, characterized in that: The first coupling path comprises: a first coupler; a first switch connected to both the first coupler and the adder; The second coupling path comprises: A second coupler connected to the first coupler; The second switch is connected to both the second coupler and the phase shifter.

5. The radio frequency circuit according to claim 4, characterized in that: The first coupler and the second coupler are connected in series.

6. The radio frequency circuit according to claim 5, characterized in that: The first end of the first coupler is connected to the power transmission path, the second end of the first coupler is connected to the first end of the second coupler, and the second end of the second coupler is connected to the antenna.

7. The radio frequency circuit according to claim 4, characterized in that: The first coupler is connected in parallel with the second coupler.

8. The radio frequency circuit according to claim 7, characterized in that: The first end of the first coupler and the first end of the second coupler are both connected to the power transmission path, and the second end of the first coupler and the second end of the second coupler are both connected to the antenna.

9. The radio frequency circuit according to any one of claims 1 to 8, characterized in that: The first coupling path is always turned on, and when the second power value of the power transmission signal determined only through the first coupling path is greater than a preset threshold, the second coupling path is turned on.

10. An electronic device, characterized in that: include: A radio frequency circuit as claimed in any one of claims 1 to 9.

11. A power detection method, characterized in that: Applied to the electronic device as claimed in claim 10, the power detection method comprises: Performing a first coupling process and a second coupling process on the power transmission signal respectively to obtain a first signal and a second signal; determining a target phase difference according to the power transmission signal, the first signal and the second signal; According to the target phase difference, performing phase shift processing on the second signal to obtain a third signal; Superimposing the first signal and the third signal to obtain a fourth signal; A first power value of the power transmission signal is determined according to the fourth signal.

12. The power detection method according to claim 11, characterized in that: The phase shift value of the phase shift processing is (180°-target phase difference).

13. The power detection method according to claim 11, characterized in that: The determining a target phase difference according to the power transmission signal, the first signal, and the second signal includes: determining a first phase difference according to the first signal and the power transmission signal; determining a second phase difference according to the second signal and the power transmission signal; The target phase difference is determined according to the first phase difference and the second phase difference.

14. The power detection method according to any one of claims 11 to 13, characterized in that: The performing first coupling processing and second coupling processing on the power transmission signal respectively to obtain the first signal and the second signal includes: performing the first coupling process on the power transmission signal to obtain the first signal; determining a second power value of the power transmission signal according to the first signal; When the second power value is greater than a preset threshold, the second coupling process is performed on the power transmission signal to obtain the second signal.

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