Radio frequency front-end circuit and electronic equipment

Abstract

The utility model discloses a radio frequency front-end circuit and electronic equipment, and a radio frequency receiving and transmitting module determines a target radio frequency signal to be received and transmitted according to a first corresponding relation between a preset signal frequency and a first matching unit and a target signal frequency of the target radio frequency signal. Firstly, a first target matching unit is determined from a plurality of first matching units, then a target radio frequency signal and a first control signal are sent to an impedance matching module, so that the impedance matching module can determine the first target matching unit matched with the target radio frequency signal, and the target radio frequency signal is transmitted through the first target matching unit. In order to enable the transmitted target radio-frequency signal to meet the communication requirement, the radio-frequency transceiver module needs to determine the first matching unit for transmitting the target radio-frequency signal according to the signal frequency of the target radio-frequency signal before receiving and transmitting the target radio-frequency signal, so that different impedance matching can be provided for the radio-frequency signals with different frequencies, and the transmission efficiency of the radio-frequency transceiver module is improved. And the matching applicability is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to radio frequency technology, and relate to but are not limited to a radio frequency front-end circuit and electronic equipment. Background Art

[0002] In general mobile communication devices, the matching impedance network of the power amplifier in the RF circuit is customized. The power amplifier is, for example, a wideband pulse amplitude modulation power amplifier. Once a different power amplifier needs to be replaced, the customized matching impedance network must also be replaced, which undoubtedly increases the production cost. Utility Model Content

[0003] In view of this, an RF front-end circuit and an electronic device provided in an embodiment of the present application can provide different impedance matching for RF signals of different frequencies, thereby improving matching applicability.

[0004] In a first aspect, an embodiment of the present application provides a radio frequency front-end circuit, the circuit comprising at least one antenna, a radio frequency transceiver module and an impedance matching module, the impedance matching module comprising at least two first matching units, each of the at least two first matching units being respectively connected to the at least one antenna and the radio frequency transceiver module, and different first matching units having different impedance values, wherein:

[0005] The RF transceiver module is used to determine the first target matching unit according to the first corresponding relationship between the preset signal frequency and the first matching unit and the target signal frequency of the target RF signal when determining the target RF signal to be transmitted and received, and send the target RF signal and a first control signal to the impedance matching module, wherein the first control signal is used to indicate the first target matching unit, and the first target matching unit is any one or more of the at least two first matching units;

[0006] The impedance matching module is used to transmit the target RF signal to the RF transceiver module or the at least one antenna according to the first target matching unit under the control of the RF transceiver module.

[0007] In one embodiment, the impedance matching module further includes a first switch unit, and the first switch unit is connected to the at least one antenna and the at least two first matching units respectively, wherein:

[0008] The first switch unit is used to conduct the connection between the first target matching unit and the at least one antenna under the control of the radio frequency transceiver module.

[0009] In one embodiment, the impedance matching module further includes at least one second matching unit, each of the at least one second matching unit is connected to the ground terminal and the first switch unit respectively, wherein:

[0010] The RF transceiver module is used to generate and send a second control signal to the first switch unit according to a second corresponding relationship between a preset signal frequency and a second matching unit and a target signal frequency of the target RF signal, wherein the second control signal is used to indicate to turn on the connection between the second target matching unit and the at least one antenna, or to disconnect the connection between each second matching unit and the at least one antenna, and the second target matching unit is any one or more of the at least one second matching unit;

[0011] The first switch unit is used to, under the control of the radio frequency transceiver module, conduct the connection between the second target matching unit and the at least one antenna, or disconnect the connection between each second matching unit and the at least one antenna;

[0012] Wherein, when the connection between the second matching unit and the at least one antenna is turned on, the impedance matching module transmits the target RF signal to the RF transceiver module or the at least one antenna through the second target matching unit and the first target matching unit.

[0013] In one embodiment, the impedance matching module further includes a second switch unit, and the second switch unit is connected to the RF transceiver module and the at least two first matching units respectively, wherein:

[0014] The second switch unit is used to conduct the connection between the first target matching unit and the RF transceiver module under the control of the RF transceiver module.

[0015] In one embodiment, the number of the impedance matching modules is at least two, the RF transceiver module includes a RF transceiver and at least two duplexers, the at least two duplexers are connected to the RF transceiver, and the at least two duplexers are also connected to at least two impedance matching modules in a one-to-one correspondence, wherein:

[0016] The at least two duplexers are used to transmit a target radio frequency signal to be sent to the at least one antenna, or to transmit a target radio frequency signal to be received to the radio frequency transceiver, and different duplexers are used to transmit radio frequency signals of different frequency bands;

[0017] The RF transceiver is used to send the target RF signal to be sent via a target duplexer, or to receive the target RF signal to be received via the target duplexer, and the target duplexer is any one or more of the at least two duplexers.

[0018] In one embodiment, the impedance matching module further includes a third matching unit, and the third matching unit is connected to the target duplexer and the second switch unit respectively, wherein:

[0019] The third matching unit is used to process the target RF signal according to a preset target impedance value when receiving the target RF signal, and transmit the processed target RF signal to the second switch unit or the target duplexer.

[0020] In one embodiment, the circuit further includes a coupling unit, and the coupling unit is connected to the at least one antenna and the radio frequency transceiver module respectively, wherein:

[0021] The coupling unit is used to obtain and transmit the coupled radio frequency signal at the at least one antenna to the radio frequency transceiver module;

[0022] The RF transceiver module is used to detect the target power value of the coupled RF signal. If the target power value is not within a preset power threshold range, the connection between the at least one antenna and the matching unit set is controlled in sequence according to a preset order until the target power value is within the power threshold range. The matching unit set includes the at least two first matching units and the at least one second matching unit.

[0023] In one of the embodiments, the RF transceiver module is also used to determine a third target matching unit that is currently connected to the at least one antenna when the target power value is within the power threshold range, and update the first correspondence relationship and the second correspondence relationship according to the third target matching unit and the target signal frequency, and the third target matching unit includes one or more of the at least two first matching units and the at least one second matching unit.

[0024] In one embodiment, the coupling unit includes a forward coupler and a backward coupler, the forward coupler is used to obtain a coupled radio frequency signal corresponding to the radio frequency signal transmitted to the at least one antenna, and the backward coupler is used to obtain a coupled radio frequency signal corresponding to a portion of the radio frequency signal reflected back and received by the at least one antenna, and the power threshold range includes a first threshold range and a second threshold range, wherein:

[0025] The RF transceiver module is used to generate a third control signal when the first power value is not within the first threshold range and / or the second power value is not within the second threshold range, the first power value is the power value of the coupled RF signal obtained by the forward coupler, the second power value is the power value of the coupled RF signal obtained by the backward coupler, and the third control signal is used to control the connection between the at least one antenna and the matching unit set.

[0026] In a second aspect, an embodiment of the present application further provides an electronic device, wherein the electronic device includes the radio frequency front-end circuit as described in the first aspect.

[0027] In the above-mentioned RF front-end circuit, multiple first matching units with different impedance values ​​are respectively connected to at least one antenna and an RF transceiver module, so that when the RF transceiver module determines the target RF signal to be transmitted and received, the first target matching unit is determined from multiple first matching units according to the first correspondence between the preset signal frequency and the first matching unit and the target signal frequency of the target RF signal, and the target RF signal and the first control signal are sent to the impedance matching module so that the impedance matching module can determine the first target matching unit that matches the target RF signal, and the target RF signal is transmitted through the first target matching unit so that the transmitted target RF signal can meet the communication requirements. In which, because the RF transceiver module needs to first determine the first matching unit that transmits the target RF signal according to the signal frequency of the target RF signal before transmitting and receiving the target RF signal, different impedance matching can be provided for RF signals of different frequencies, thereby improving the matching applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0029] Figure 1 A schematic diagram of the structure of a radio frequency front-end circuit provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of the structure of an impedance matching module provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of the structure of an impedance matching module provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of the structure of an impedance matching module provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of the structure of the radio frequency transceiver module provided in an embodiment of the present application;

[0034] Figure 6 A schematic diagram of the structure of a radio frequency front-end circuit provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the structure of a radio frequency front-end circuit provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of the structure of a coupling unit provided in an embodiment of the present application;

[0037] Fig. 9 A schematic diagram of the implementation structure of the RF front-end circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the specific technical solution of the present application will be further described in detail below in conjunction with the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0040] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0041] It should be pointed out that the terms "first\second\third" involved in the embodiments of the present application are used to distinguish similar or different objects, and do not represent a specific ordering of the objects. It can be understood that "first\second\third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of the present application described here can be implemented in an order other than that illustrated or described here.

[0042] Figure 1 This is a schematic diagram of the structure of a radio frequency front-end circuit provided in an embodiment of the present application. Figure 1 As shown, the RF front-end circuit may include at least one antenna 103, a RF transceiver module 101 and an impedance matching module 102, the impedance matching module 102 includes at least two first matching units 1021, each of the at least two first matching units 1021 is connected to at least one antenna 103 and the RF transceiver module 101, and different first matching units 1021 have different impedance values, wherein:

[0043] The RF transceiver module 101 is used to determine the first target matching unit according to the first corresponding relationship between the preset signal frequency and the first matching unit 1021 and the target signal frequency of the target RF signal when determining the target RF signal to be transmitted and received, and send the target RF signal and the first control signal to the impedance matching module 102, wherein the first control signal is used to indicate the first target matching unit, and the first target matching unit is any one or more of the at least two first matching units 1021;

[0044] The impedance matching module 102 is used to transmit a target RF signal to the RF transceiver module 101 or at least one antenna 103 according to a first target matching unit under the control of the RF transceiver module 101 .

[0045] During the implementation process, since different first matching units 1021 have different impedance values, and the size of the impedance value and the frequency of the RF signal will affect the transmission effect of the RF signal, when determining the target RF signal to be transmitted and received, it is necessary to first determine the first target matching unit according to the signal frequency of the target RF signal, and then send the target RF signal and the first control signal to the impedance matching module 102, so that the impedance matching module 102 transmits the target RF signal to the RF transceiver module 101 or at least one antenna 103 according to the first target matching unit. Before transmitting the target RF signal, the first target matching unit to be transmitted of the target RF signal is first determined, which can ensure that the circuit can transmit and receive RF signals by determining the corresponding first target matching unit from at least two first matching units 1021 regardless of the specific frequency of the RF signal to be transmitted and received.

[0046] Optionally, the above-mentioned RF transceiver module 101 may include an RF power amplifier and an RF transceiver 1011. The RF transceiver 1011 is used to output the RF signal to be sent and receive the RF signal. The RF power amplifier is used to amplify the RF signal to be sent. The specific implementation means adopt the common technical means in the prior art, which will not be repeated here.

[0047] Optionally, the first matching unit 1021 may include impedance elements such as capacitors and inductors, and each first matching unit 1021 may include different impedance elements, or may include the same impedance elements with different impedance values, so that different first matching units 1021 have different impedance values. In some embodiments, each first matching unit 1021 may specifically adopt a common impedance matching network in the prior art, and the specific structure is not repeated here.

[0048] Optionally, the above-mentioned first correspondence relationship can be achieved by testing RF signals of different frequencies in advance. During the test, the RF signal is transmitted through different first matching units 1021 to output the test signal, and then the test signal and the RF signal are compared to take the first matching unit 1021 with the smallest phase difference as the first matching unit 1021 corresponding to the RF signal. Similarly, RF signals of other frequencies can also perform the same test steps, so as to obtain the above-mentioned first correspondence relationship through a limited number of tests.

[0049] For example, at least one first matching unit 1021 includes a first matching network and a second matching network, the first matching network and the second matching network have different impedance values, the first matching network and the second matching network are respectively connected to the RF transceiver module 101 and the antenna 103, the RF transceiver module 101 generates a set of original data in advance, including test transmission data and test reception data, the set of original data passes through the first matching network and the second matching network respectively to obtain two sets of test data, and then compares the two sets of test data to obtain a set of target test data with a maximum value, and uses the matching network corresponding to the target test data as the matching unit corresponding to the sending RF signal.

[0050] In some embodiments, the RF transceiver module 101 may send a control signal to the impedance matching module 102 to adjust the impedance matching module 102 to a corresponding matching unit, thereby adjusting the impedance value of the impedance matching module 102 in real time according to the signal frequency of the target RF signal.

[0051] It should be noted that the impedance value of each of the at least two first matching units 1021 in the present application is set by those skilled in the art according to actual conditions, and the present application does not impose any limitation thereto.

[0052] In the above-mentioned RF front-end circuit, multiple first matching units 1021 with different impedance values ​​are respectively connected to at least one antenna 103 and the RF transceiver module 101, so that when the RF transceiver module 101 determines the target RF signal to be transmitted and received, the first target matching unit is determined from the multiple first matching units 1021 according to the first corresponding relationship between the preset signal frequency and the first matching unit 1021 and the target signal frequency of the target RF signal, and the target RF signal and the first control signal are sent to the impedance matching module 102, so that the impedance matching module 102 can determine the first target matching unit that matches the target RF signal, and transmit the target RF signal through the first target matching unit, so that the transmitted target RF signal can meet the communication requirements, wherein, before the RF transceiver module 101 transmits and receives the target RF signal, it is necessary to first determine the first matching unit 1021 that transmits the target RF signal according to the signal frequency of the target RF signal, so that different impedance matching can be provided for RF signals of different frequencies, thereby improving the matching applicability.

[0053] In some embodiments, Figure 2 As shown, the impedance matching module 102 further includes a first switch unit 1022, and the first switch unit 1022 is respectively connected to at least one antenna 103 and at least two first matching units 1021, wherein:

[0054] The first switch unit 1022 is used to conduct the connection between the first target matching unit and the at least one antenna 103 under the control of the RF transceiver module 101 .

[0055] During the implementation process, after determining the first target matching unit, the RF transceiver module 101 can send a control signal to the first switch unit 1022 to control the connection between the first target matching unit and at least one antenna 103 through the first target matching unit, so that the target RF signal is transmitted to at least one antenna 103 through the first target matching unit, thereby completing the sending of the target RF signal, and allowing the target RF signal to be transmitted to the RF transceiver module 101 through the first target matching unit, thereby completing the reception of the target RF signal.

[0056] Optionally, the first switch unit 1022 may be a multi-pole multi-throw switch so that when there are multiple target RF signals of different frequencies, the first switch unit 1022 may simultaneously conduct the connection between multiple switch ports and multiple first matching units 1021 to transmit the multiple target RF signals respectively.

[0057] Optionally, the above-mentioned first switch unit 1022 includes a first connection end and multiple second connection ends, the first connection end is connected to at least one antenna 103, and the multiple second connection ends are connected one-to-one to at least two first matching units 1021. The first switch unit 1022 can conduct the connection between the second connection end corresponding to the first target matching unit and the first connection end, so that the target RF signal is transmitted to at least one antenna 103 through the first target matching unit.

[0058] It can be understood that by setting the first switch unit 1022, it is possible to select one of the at least two first matching units 1021 as the transmission path for transmitting the target RF signal, thereby preventing other first matching units 1021 from affecting the transmission path and reducing the device cost.

[0059] In some embodiments, Figure 3 As shown, the impedance matching module 102 further includes at least one second matching unit 1023, each of the at least one second matching unit 1023 is connected to the ground terminal and the first switch unit 1022, respectively, and different second matching units 1023 have different impedance values, wherein:

[0060] The RF transceiver module 101 is used to generate and send a second control signal to the first switch unit 1022 according to a second corresponding relationship between a preset signal frequency and a second matching unit 1023 and a target signal frequency of a target RF signal, wherein the second control signal is used to indicate to turn on the connection between the second target matching unit and at least one antenna 103, or to disconnect the connection between each second matching unit 1023 and at least one antenna 103, wherein the second target matching unit is any one or more of the at least one second matching unit 1023;

[0061] A first switch unit 1022 is used to connect the second target matching unit and at least one antenna 103, or disconnect the connection between each second matching unit 1023 and at least one antenna 103 under the control of the RF transceiver module 101;

[0062] When the connection between the second matching unit 1023 and at least one antenna 103 is turned on, the impedance matching module 102 transmits the target RF signal to the RF transceiver module 101 or at least one antenna 103 through the second target matching unit and the first target matching unit.

[0063] During implementation, in addition to selecting one of the at least two first matching units 1021 as the corresponding matching circuit, the RF transceiver module 101 can also control the first switch unit 1022 to turn on the second matching unit 1023, so as to connect the second matching unit 1023 in parallel between the first target matching unit and at least one antenna 103, and the first target matching unit and the second matching unit 1023 in parallel can obtain an additional impedance value, thereby expanding the selectivity of the impedance value. In addition, since the second matching unit 1023 is directly connected to the first switch unit 1022, it can be connected in parallel with any first matching unit 1021 to achieve global matching.

[0064] Among them, the above second corresponding relationship indicates the situation where the connection between the second target matching unit and at least one antenna 103 needs to be turned on, and also indicates the situation where the connection between the second target matching unit and at least one antenna 103 does not need to be turned on. When the signal frequency of the target RF signal corresponds to the situation where the connection between the second target matching unit and at least one antenna 103 needs to be turned on, the RF transceiver module 101 will control the first switch unit 1022 to turn on the connection between the second target matching unit and at least one antenna 103; when the signal frequency of the target RF signal corresponds to the situation where the connection between the second target matching unit and at least one antenna 103 does not need to be turned on, the RF transceiver module 101 will control the first switch unit 1022 to disconnect the connection between each second matching unit 1023 and at least one antenna 103, and transmit the target RF signal only through the first target matching unit.

[0065] The second matching unit 1023 may be the same as or different from the first matching unit 1021 , and is configured by those skilled in the art according to actual conditions, and is not limited in this application.

[0066] It can be understood that by setting at least one second matching unit 1023 to be connected to the ground and the first switch unit 1022 respectively, the RF transceiver module 101 can be combined in at least two first matching units 1021 and at least one second matching unit 1023 to obtain multiple additional impedance values, thereby expanding the selectivity of the matching impedance value.

[0067] In some embodiments, Figure 4 As shown, the impedance matching module 102 further includes a second switch unit 1024, and the second switch unit 1024 is respectively connected to the RF transceiver module 101 and at least two first matching units 1021, wherein:

[0068] The second switch unit 1024 is used to conduct the connection between the first target matching unit and the RF transceiver module 101 under the control of the RF transceiver module 101 .

[0069] During the implementation process, after determining the first target matching unit, the RF transceiver module 101 can send a control signal to the second switch unit 1024 to control the second switch unit 1024 to turn on the connection between the first target matching unit and the RF transceiver module 101, so that the target RF signal is transmitted to the first target matching unit through the RF transceiver module 101, thereby completing the sending of the target RF signal, and allowing the target RF signal to be transmitted to the RF transceiver module 101 through the first target matching unit, thereby completing the reception of the target RF signal.

[0070] Optionally, the second switch unit 1024 may be a multi-pole multi-throw switch so that when there are multiple target RF signals of different frequencies, the second switch unit 1024 may simultaneously conduct the connection between multiple switch ports and multiple first matching units 1021 to transmit the multiple target RF signals respectively.

[0071] Optionally, the second switch unit 1024 includes a first connection end and multiple second connection ends, the first connection end is connected to the RF transceiver module 101, and the multiple second connection ends are connected one-to-one to at least two first matching units 1021. The second switch unit 1024 can conduct the connection between the second connection end corresponding to the first target matching unit and the first connection end, so that the target RF signal can be transmitted between the RF transceiver module 101 and at least one antenna 103.

[0072] It can be understood that by setting the second switch unit 1024 to conduct the connection between the first target matching unit and the RF transceiver module 101, it is possible to select one of the at least two first matching units 1021 as the transmission path for transmitting the target RF signal, thereby avoiding other first matching units 1021 from affecting the transmission path and reducing the device cost.

[0073] In some embodiments, Figure 5 As shown, the number of the impedance matching modules 102 is at least two, the RF transceiver module 101 includes a RF transceiver 1011 and at least two duplexers 1012, at least two duplexers 1012 are connected to the RF transceiver 1011, and at least two duplexers 1012 are also connected to at least two impedance matching modules 102 in a one-to-one correspondence, wherein:

[0074] At least two duplexers 1012, used to transmit a target radio frequency signal to be transmitted to at least one antenna 103, or to transmit a target radio frequency signal to be received to the radio frequency transceiver 1011, and different duplexers 1012 are used to transmit radio frequency signals of different frequency bands;

[0075] The RF transceiver 1011 is used to send a target RF signal to be sent via a target duplexer 1012 , or receive a target RF signal to be received via a target duplexer 1012 . The target duplexer 1012 is any one or more of the at least two duplexers 1012 .

[0076] During the implementation process, when sending the target RF signal, the duplexer 1012 switches to the transmitting channel to transmit the target RF signal output by the RF transceiver 1011 to the corresponding impedance matching module 102 to complete the signal sending work; when receiving the target RF signal, the duplexer 1012 switches to the receiving channel to transmit the target RF signal received by the antenna 103 to the RF transceiver 1011 to complete the signal receiving work.

[0077] It is understandable that by setting at least two duplexers 1012, when it is necessary to simultaneously transmit and receive multiple RF signals, the RF transceiver module 101 can provide different transmission paths for the multiple RF signals to simultaneously complete the transmission and reception of multiple RF signals.

[0078] In some embodiments, Figure 6 As shown, the impedance matching module 102 further includes a third matching unit 1025, and the third matching unit 1025 is connected to the target duplexer 1012 and the second switch unit 1024 respectively, wherein:

[0079] The third matching unit 1025 is used to process the target RF signal according to a preset target impedance value when receiving the target RF signal, and transmit the processed target RF signal to the second switch unit 1024 or the target duplexer 1012 .

[0080] During the implementation process, when the third matching unit 1025 receives the target RF signal transmitted by the RF transceiver module 101, the target RF signal can be first processed according to its own impedance value, and then the processed target RF signal can be transmitted to the second switch unit 1024, so that the second switch unit 1024 transmits based on the processed target RF signal; when the third matching unit 1025 receives the target RF signal transmitted by the second switch unit 1024, the target RF signal can be first processed according to its own impedance value, and then the processed target RF signal can be transmitted to the RF transceiver module 101, so that the RF transceiver module 101 performs subsequent signal demodulation based on the processed target RF signal.

[0081] The third matching unit 1025 may be the same as or different from the second matching unit 1023 or the first matching unit 1021 , and is configured by those skilled in the art according to actual conditions, and is not limited in this application.

[0082] It can be understood that, by setting the third matching unit 1025 to provide an additional impedance value for the target RF signal, the RF transceiver module 101 can select from a variety of transmission paths when performing impedance matching according to the target RF signal.

[0083] In some embodiments, Figure 7 As shown, the above circuit further includes a coupling unit 104, and the coupling unit 104 is connected to at least one antenna 103 and the RF transceiver module 101 respectively, wherein:

[0084] A coupling unit 104, configured to obtain and transmit a coupled radio frequency signal from at least one antenna 103 to the radio frequency transceiver module 101;

[0085] The RF transceiver module 101 is used to detect the target power value of the coupled RF signal. If the target power value is not within a preset power threshold range, the connection between at least one antenna 103 and a matching unit set is controlled in sequence according to a preset order until the target power value is within the power threshold range. The matching unit set includes at least two first matching units 1021 and at least one second matching unit 1023.

[0086] During the implementation process, in order to detect whether the target RF signal is accurately sent, a coupling unit 104 can be set on the transmission path between at least one antenna 103 and the RF transceiver module 101, so that the coupling unit 104 obtains and transmits the coupled RF signal at at least one antenna 103 to the RF transceiver module 101. The RF transceiver module 101 can detect the target power value of the coupled RF signal. If the target power value is not within the preset power threshold range, the connection between at least one antenna 103 and the matching unit set is controlled in sequence according to a preset order until the target power value is within the power threshold range.

[0087] Among them, the above-mentioned preset order is set by technical personnel in this field according to actual conditions. For example, the matching unit set includes matching unit A, matching unit B and matching unit C, wherein matching unit A and matching unit B are both first matching unit 1021, and matching unit C is the second matching unit 1023. The preset order can be to first turn on only matching unit A, then turn on only matching unit B, then turn on matching unit A and matching unit C, and finally turn on matching unit B and matching unit C. This application does not impose any restrictions.

[0088] In some embodiments, the RF transceiver module 101 is also used to determine the third target matching unit currently connected to at least one antenna 103 when the target power value is within the power threshold range, and update the first correspondence and the second correspondence according to the third target matching unit and the target signal frequency. The third target matching unit includes one or more of at least two first matching units 1021 and at least one second matching unit 1023, so that the first correspondence and the second correspondence can be updated according to the current switch conduction state, so that when the target RF signal is subsequently sent, the transmission can be performed directly according to the third target matching unit.

[0089] It can be understood that by setting the coupling unit 104 to obtain and transmit the coupled RF signal at at least one antenna 103 to the RF transceiver module 101, the RF transceiver module 101 can detect the target power value of the coupled RF signal and adjust the switch conduction status of the first switch unit 1022 and the second switch unit 1024 in real time to adjust the third target matching unit connected to the antenna 103.

[0090] In some embodiments, Figure 8 As shown, the coupling unit 104 includes a forward coupler 1041 and a backward coupler 1042, the forward coupler 1041 is used to obtain a coupled radio frequency signal corresponding to the radio frequency signal transmitted to at least one antenna 103, and the backward coupler 1042 is used to obtain a coupled radio frequency signal corresponding to a portion of the radio frequency signal reflected back and received by at least one antenna 103, and the power threshold range includes a first threshold range and a second threshold range, wherein:

[0091] The RF transceiver module 101 is used to generate a third control signal when the first power value is not within the first threshold range and / or the second power value is not within the second threshold range. The first power value is the power value of the coupled RF signal obtained by the forward coupler 1041, and the second power value is the power value of the coupled RF signal obtained by the backward coupler 1042. The third control signal is used to control the connection between at least one antenna 103 and the matching unit set.

[0092] During the implementation process, the forward coupler 1041 will obtain a coupled RF signal corresponding to the RF signal transmitted to at least one antenna 103. The RF transceiver module 101 can determine whether the RF signal transmitted to the antenna 103 is accurate based on the coupled RF signal obtained by the forward coupler 1041. The backward coupler 1042 will obtain a coupled RF signal corresponding to the partial RF signal reflected back and received by at least one antenna 103. The RF transceiver module 101 can determine whether the RF signal can be radiated through the antenna 103 based on the coupled RF signal obtained by the backward coupler 1042. If the antenna 103 cannot radiate and causes reflection, that is, the coupled RF signal obtained by the backward coupler 1042 is not within the second threshold range, then the above-mentioned third control signal is generated.

[0093] It can be understood that by setting the forward coupler 1041 to detect whether the RF signal transmitted to the antenna 103 is accurate, and by setting the backward coupler 1042 to detect whether the RF signal can be radiated through the antenna 103, it can be ensured that when there are obstructions, the impedance value of the target RF signal can reach the optimal state.

[0094] Fig. 9 The following is a schematic diagram of the implementation structure of a radio frequency front-end circuit provided in an embodiment of the present application. Fig. 9As shown, the RF front-end circuit includes an antenna 103, a RF transceiver module 101 and an impedance matching module 102. The RF transceiver module 101 includes a RF transceiver 1011, a power amplifier and three duplexers 1012. The three duplexers 1012 are Band 1 duplexer, Band 3 duplexer and Band 7 duplexer. The impedance matching module 102 includes at least two first matching units 1021, at least one second matching unit 1023, a third matching unit 1025, a first switch unit 1022 and a second switch unit 1024. The first switch unit 1022 includes a first switch S PDT1, a second switch SPDT2 and a third switch SPDT3, the second switch unit 1024 includes a fourth switch SP8T, at least two first matching units 1021 include Band1 matching network 2, Band1 matching network 3, Band3 matching network 2, Band3 matching network 3, Band7 matching network 2 and Band7 matching network 3, at least one second matching unit 1023 includes a global matching network 1, a global matching network 2, and the third matching unit 1025 includes Band1 matching network 1, Band3 matching network 1 and Band7 matching network 1. Among them, Band1 duplexer, Band3 duplexer and Band7 duplexer, wherein the first connection ends of Band1 duplexer, Band3 duplexer and Band7 duplexer are connected to the transmitting port of the RF transceiver through the RF power amplifier, the second connection ends of Band1 duplexer, Band3 duplexer and Band7 duplexer are connected to the receiving port of the RF transceiver, the third connection end of Band1 duplexer is connected to one end of Band1 matching network 1, the third connection end of Band3 duplexer is connected to one end of Band3 matching network 1, the third connection end of Band7 duplexer is connected to one end of Band7 matching network 1, and the other ends of Band1 matching network 1, Band3 matching network 1 and Band7 matching network 1 are respectively connected to the first switch SPDT1, the second switch SPDT2 and The first connection end of the third switch SPDT3 is connected, the second connection end of the first switch SPDT1 is connected to one end of Band1 matching network 2 and Band1 matching network 3 respectively, the second connection end of the second switch SPDT2 is connected to one end of Band3 matching network 2 and Band1 matching network 3 respectively, the second connection end of the third switch SPDT3 is connected to one end of Band7 matching network 2 and Band1 matching network 3 respectively, the other ends of global matching network 1, global matching network 2, Band1 matching network 2, Band1 matching network 3, Band3 matching network 2, Band3 matching network 3, Band7 matching network 2 and Band7 matching network 3 are all connected to one end of the fourth switch SP8T, and the other end of the fourth switch SP8T is respectively connected to the forward coupler, reverse coupler and antenna.

[0095] During implementation, if the Band1 duplexer is in a working state, the Band1 duplexer is connected to the third port SP8T-3 of the fourth switch SP8T (or the fourth port SP8T-4 of the fourth switch SP8T) through the Band1 matching network 1 and the Band1 matching network 2 (or the Band1 matching network 1 and the Band1 matching network 3), and the fourth switch SP8T can conduct the connection between SP8T-3 (or SP8T-4) and the antenna, so that the radio frequency signal is sent to the antenna through the Band1 duplexer, the Band1 matching network 1 and the Band1 matching network 2 (or the Band1 duplexer, the Band1 matching network 1 and the Band1 matching network 3); similarly, if the Band3 duplexer is in a working state, the Band3 duplexer is connected to the fifth port SP8T-5 of the fourth switch SP8T (or the sixth port SP8T of the fourth switch SP8T) through the Band3 matching network 1 and the Band3 matching network 2 (or the Band3 matching network 1 and the Band3 matching network 3). 8T-6), the fourth switch SP8T can conduct the connection between SP8T-5 (or SP8T-6) and the antenna, so that the radio frequency signal is sent to the antenna via the Band3 duplexer, Band3 matching network 1 and Band3 matching network 2 (or Band3 duplexer, Band3 matching network 1 and Band3 matching network 3); similarly, if the Band7 duplexer is in working state, the Band7 duplexer is connected to the seventh port SP8T-7 of the fourth switch SP8T (or the eighth port SP8T-8 of the fourth switch SP8T) through the Band7 matching network 1 and Band7 matching network 2 (or Band7 matching network 1 and Band7 matching network 3), and the fourth switch SP8T can conduct the connection between SP8T-7 (or SP8T-8) and the antenna, so that the radio frequency signal is sent to the antenna via the Band7 duplexer, Band7 matching network 1 and Band7 matching network 2 (or Band7 duplexer, Band7 matching network 1 and Band7 matching network 3). In some embodiments, only one of the Band 1 duplexer, Band 3 duplexer, and Band 7 duplexer may be in working order, or multiple duplexers may be in working order at the same time. When multiple duplexers are in working order at the same time, the fourth switch SP8T will simultaneously turn on the antenna and some or all of the multiple switch ports (SP8T-3, SP8T-4, SP8T-5, SP8T-6, SP8T-7, and SP8T-8).

[0096] Meanwhile, the fourth switch SP8T can further conduct the first port SP8T-1 and the second port SP8T-2 in addition to the above-mentioned multiple switch ports to further adjust the impedance matching of the Band 1 duplexer, the Band 3 duplexer and the Band 7 duplexer in the working state.

[0097] When determining which switch conduction state the RF signal corresponds to, the following situations can be considered:

[0098] Case 1, single channel:

[0099] The RF front-end circuit will generate a set of raw data including transmission data and reception data. This set of raw data passes through Band1 matching network 2 and SP8T-3 to obtain the first set of test data; this set of raw data passes through Band1 matching network 2 and SP8T-3, while SP8T-1 is turned on, to obtain the second set of test data; this set of raw data passes through Band1 matching network 2 and SP8T-3, while SP8T-2 is turned on, to obtain the third set of test data; this set of raw data passes through Band1 matching network 2 and SP8T-3, while SP8T-1 and SP8 are turned on. T-2, the fourth group of test data is obtained; this group of original data passes through Band1 matching network 3 and SP8T-4 to obtain the fifth group of test data; this group of original data passes through Band1 matching network 3 and SP8T-4, and SP8T-1 is turned on at the same time to obtain the sixth group of test data; this group of original data passes through Band1 matching network 3 and SP8T-4, and SP8T-2 is turned on at the same time to obtain the seventh group of test data; this group of original data passes through Band1 matching network 3 and SP8T-4, and SP8T-1 and SP8T-2 are turned on at the same time to obtain the eighth group of test data. The above eight groups of test data are compared, and the maximum value among them is taken as the optimal group. The switch conduction condition corresponding to the optimal group is the channel parameter of Band1 when working in a single frequency band. Similarly, the calibration steps of the optimal group of channel parameters of Band3 and Band7 when working in a single frequency band are the same as the steps of the optimal group of channel parameters of Band1 when working in a single frequency band.

[0100] Case 2, dual channels:

[0101] The only difference between the dual-channel case and the single-channel case is that when Band 3 is in the SP8T-5 port and the SP8T common end is turned on, Band 1 is in the SP8T-3 and SP8T common end is turned on, or SP8T-4 and SP8T common end is turned on, repeat the steps of "the first step, single-channel calibration" to obtain 8 groups of Band 1 test data and 8 groups of Band 3 test data in a one-to-one correspondence; when Band 3 is in the SP8T-6 switch and the SP8T common end is turned on, Band 1 is in the SP8T-3 and SP8T is turned on, or SP8T-4 and SP8T is turned on, repeat the steps of the single-channel case to obtain 8 groups of Band 1 test data and 8 groups of Band 3 test data in a one-to-one correspondence; these 16 groups of Band 1 and Band 3 test data are Band 1 and Band 3 Test data under all combinations, after obtaining this set of data, the absolute values ​​of the transmission data of Band 1 and the transmission data of Band 3 in the test data can be added to obtain the first data, the absolute values ​​of the reception data of Band 1 and the reception data of Band 3 can be added to obtain the second data, and then the first data and the second data can be added again, and the maximum value of the sum is taken as the conduction mode of the switch of SP8T when Band 1 and Band 3 work at the same time. Therefore, the optimal opening mode of SP8T when Band 1 and Band 3 work is obtained. Similarly, the calibration steps of the optimal set of channel parameters when Band 1 and Band 7 and Band 3 and Band 7 work are the same as the aforementioned steps of the optimal set of channel parameters when Band 1 and Band 3 work.

[0102] Case 3, three channels:

[0103] The three duplexers have two pass states respectively: Band 1 has two pass states, SP8T-3 and SP8T-4, Band 3 has two pass states, SP8T-5 and SP8T-6, and Band 7 has two pass states, SP8T-7 and SP8T-8. Therefore, when the three duplexers work at the same time, there are a total of 8 different switch conduction combinations:

[0104] SP8T-3, SP8T-5, SP8T-7;

[0105] SP8T-3, SP8T-6, SP8T-7;

[0106] SP8T-3, SP8T-5, SP8T-8;

[0107] SP8T-3, SP8T-6, SP8T-8;

[0108] SP8T-4, SP8T-5, SP8T-7;

[0109] SP8T-4, SP8T-6, SP8T-7;

[0110] SP8T-4, SP8T-5, SP8T-8;

[0111] As well as, SP8T-4, SP8T-6, SP8T-8.

[0112] Depending on whether SP8T-1 and SP8T-2 are turned on, there are four states:

[0113] SP8T-1 is not open, and SP8T-2 is not open;

[0114] SP8T-1 is on, and SP8T-2 is not on;

[0115] SP8T-1 is not open, and SP8T-2 is open;

[0116] SP8T-1 is open, and SP8T-2 is open;

[0117] After the combination, there are 32 states in total. After calculating the absolute value of the transmitted data and the sum of the absolute value of the received data of each group of Band1, Band3, and Band7 in these 32 states, the group of data with the largest absolute value is obtained as the optimal data. When actually calling, this group of data is called first.

[0118] However, in actual use, if the antenna is blocked, the impedance of the antenna will change, resulting in the optimal state obtained in case 3 not always being optimal. At this time, the switch conduction condition needs to be adjusted according to the actual situation. The adjustment steps include:

[0119] The power thresholds of the normal and reverse couplers are set. When the forward coupler state is within the power threshold and the coupling power value of the reverse coupler is greater than the threshold (indicating that the proportion of the power output to the antenna that is reflected is higher than the state corresponding to the threshold setting), the 32 switch combinations in situation three are repeated in sequence, and the coupling power values ​​of the forward coupler and the reverse coupler at this time are continuously scanned. When the coupling power value of the forward coupler (the sum of the forward coupling power value of Band1 + the forward coupling power value of Band3 + the forward coupling power value of Band7) is within the threshold in all switch states, and the coupling value of the reverse coupler (the sum of the backward coupling power value of Band1 + the backward coupling power value of Band3 + the backward coupling power value of Band7) reaches the minimum in all switch states, this group of SP8T states is selected as the current optimal SP8T state for use.

[0120] By implementing the above embodiment, different matching paths and combinations can be used under different frequency band combinations, and the adjustment is very flexible. Moreover, the path parameters can be adjusted according to the actual situation based on the current matching form.

[0121] It should be understood that "one embodiment" or "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in one embodiment" or "in some embodiments" appearing throughout the specification may not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application. The above-mentioned sequence numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above description of each embodiment tends to emphasize the differences between the various embodiments, and the same or similar aspects can be referenced to each other. For the sake of brevity, this article will not repeat them.

[0122] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist at the same time, and object B exists alone.

[0123] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0124] The modules described above as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules; they may be located in one place or distributed on multiple network units; some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0125] In addition, all functional modules in the embodiments of the present application may be integrated into one processing unit, or each module may be a separate unit, or two or more modules may be integrated into one unit; the above-mentioned integrated modules may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0126] Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0127] The features disclosed in several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0128] The above is only an implementation method of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A radio frequency front-end circuit, characterized in that: The circuit includes at least one antenna, a radio frequency transceiver module and an impedance matching module, wherein the impedance matching module includes at least two first matching units, each of the at least two first matching units is respectively connected to the at least one antenna and the radio frequency transceiver module, and different first matching units have different impedance values, wherein: The RF transceiver module is used to determine the first target matching unit according to the first corresponding relationship between the preset signal frequency and the first matching unit and the target signal frequency of the target RF signal when determining the target RF signal to be transmitted and received, and send the target RF signal and a first control signal to the impedance matching module, wherein the first control signal is used to indicate the first target matching unit, and the first target matching unit is any one or more of the at least two first matching units; The impedance matching module is used to transmit the target RF signal to the RF transceiver module or the at least one antenna according to the first target matching unit under the control of the RF transceiver module.

2. The circuit according to claim 1, characterized in that The impedance matching module further includes a first switch unit, and the first switch unit is connected to the at least one antenna and the at least two first matching units respectively, wherein: The first switch unit is used to conduct the connection between the first target matching unit and the at least one antenna under the control of the radio frequency transceiver module.

3. The circuit according to claim 2, characterized in that The impedance matching module further includes at least one second matching unit, each of which is connected to the ground terminal and the first switch unit respectively, wherein: The RF transceiver module is used to generate and send a second control signal to the first switch unit according to a second corresponding relationship between a preset signal frequency and a second matching unit and a target signal frequency of the target RF signal, wherein the second control signal is used to indicate to turn on the connection between the second target matching unit and the at least one antenna, or to disconnect the connection between each second matching unit and the at least one antenna, and the second target matching unit is any one or more of the at least one second matching unit; The first switch unit is used to, under the control of the radio frequency transceiver module, conduct the connection between the second target matching unit and the at least one antenna, or disconnect the connection between each second matching unit and the at least one antenna; Wherein, when the connection between the second matching unit and the at least one antenna is turned on, the impedance matching module transmits the target RF signal to the RF transceiver module or the at least one antenna through the second target matching unit and the first target matching unit.

4. The circuit according to claim 2, characterized in that The impedance matching module further includes a second switch unit, which is connected to the RF transceiver module and the at least two first matching units respectively, wherein: The second switch unit is used to conduct the connection between the first target matching unit and the RF transceiver module under the control of the RF transceiver module.

5. The circuit according to claim 4, characterized in that The number of the impedance matching modules is at least two, the RF transceiver module includes a RF transceiver and at least two duplexers, the at least two duplexers are connected to the RF transceiver, and the at least two duplexers are also connected to at least two impedance matching modules in a one-to-one correspondence, wherein: The at least two duplexers are used to transmit a target radio frequency signal to be sent to the at least one antenna, or to transmit a target radio frequency signal to be received to the radio frequency transceiver, and different duplexers are used to transmit radio frequency signals of different frequency bands; The RF transceiver is used to send the target RF signal to be sent via a target duplexer, or to receive the target RF signal to be received via the target duplexer, and the target duplexer is any one or more of the at least two duplexers.

6. The circuit according to claim 5, characterized in that The impedance matching module further includes a third matching unit, and the third matching unit is connected to the target duplexer and the second switch unit respectively, wherein: The third matching unit is used to process the target RF signal according to a preset target impedance value when receiving the target RF signal, and transmit the processed target RF signal to the second switch unit or the target duplexer.

7. The circuit according to claim 3, characterized in that The circuit further includes a coupling unit, and the coupling unit is connected to the at least one antenna and the radio frequency transceiver module respectively, wherein: The coupling unit is used to obtain and transmit the coupled radio frequency signal at the at least one antenna to the radio frequency transceiver module; The RF transceiver module is used to detect the target power value of the coupled RF signal. If the target power value is not within a preset power threshold range, the connection between the at least one antenna and the matching unit set is controlled in sequence according to a preset order until the target power value is within the power threshold range. The matching unit set includes the at least two first matching units and the at least one second matching unit.

8. The circuit according to claim 7, characterized in that The RF transceiver module is also used to determine, when the target power value is within the power threshold range, a third target matching unit that is currently connected to the at least one antenna, and update the first correspondence relationship and the second correspondence relationship according to the third target matching unit and the target signal frequency, wherein the third target matching unit includes one or more of the at least two first matching units and the at least one second matching unit.

9. The circuit according to claim 7, characterized in that The coupling unit includes a forward coupler and a backward coupler, the forward coupler is used to obtain a coupled radio frequency signal corresponding to the radio frequency signal transmitted to the at least one antenna, and the backward coupler is used to obtain a coupled radio frequency signal corresponding to a portion of the radio frequency signal reflected back and received by the at least one antenna, and the power threshold range includes a first threshold range and a second threshold range, wherein: The RF transceiver module is used to generate a third control signal when the first power value is not within the first threshold range and / or the second power value is not within the second threshold range, the first power value is the power value of the coupled RF signal obtained by the forward coupler, the second power value is the power value of the coupled RF signal obtained by the backward coupler, and the third control signal is used to control the connection between the at least one antenna and the matching unit set.

10. An electronic device, characterized in that: The electronic device comprises a radio frequency front-end circuit as described in any one of claims 1-9.

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