An antenna switching circuit and a signal receiving method

Abstract

This application provides an antenna switching circuit and a signal receiving method. The antenna switching circuit includes at least two receiving branches, a first phase-shifting branch, and a controller. Each receiving branch and the first phase-shifting branch are connected to the same antenna. The controller is used to adjust the first phase-shifting branch when the antenna receives a downlink carrier aggregation radio frequency signal that includes at least a first frequency band and a second frequency band, and the input impedance of the first receiving branch corresponding to the first sub-radio frequency signal of the first frequency band to the second sub-radio frequency signal of the second frequency band is less than or equal to a preset threshold. This adjusts the first phase-shifting branch to receive the second sub-radio frequency signal, making the input impedance of the first phase-shifting branch to the second sub-radio frequency signal greater than the preset threshold. The first phase-shifting branch is used to receive the first sub-radio frequency signal, and the second receiving branch corresponding to the second sub-radio frequency signal is used to receive the second sub-radio frequency signal. This enables impedance conversion of multiple forms across different frequency bands, covering the needs of various carrier aggregation combinations.

Description

Technical Field

[0001] This application relates to radio frequency signal transmission technology, and more particularly to an antenna switching circuit and a signal receiving method. Background Technology

[0002] Carrier aggregation (CA) integrates and allocates resources across multiple frequency bands (also known as frequency bands), bringing multiple core advantages such as increased speed, capacity, and efficient spectrum utilization. It is an indispensable foundational capability for modern and future mobile communication networks. Currently, CA across two or more frequency bands is typically achieved by using an antenna switch module (ASM) to open switches connected to the line in different receiving branches. For example, when CA is implemented using Band_A+Band_B+Band_C, the switches connected to BandA / BandB / BandC on the ASM will all be open. At this time, the BandA port is interconnected with the BandB / BandC ports, causing signal leakage and resulting in reduced or degraded sensitivity (CAdesense). Currently, a passive phase-shifting network can be added to the input of the filter in the receiving branch corresponding to a certain frequency band (which must be the signal of the first frequency band in CA) to change the input impedance of the filter for another frequency band (such as the signal of the second frequency band in CA) from a low-impedance state to a high-impedance state. However, this design approach not only requires adjusting the impedance matching of the second frequency band, but also needs to take into account the impedance matching of its own frequency band (such as the first frequency band). As the number of CA combinations that the terminal needs to support increases, the design difficulty also increases. Summary of the Invention

[0003] This application provides an antenna switching circuit and a signal receiving method that can realize impedance conversion of multiple forms of different frequency bands, covering the needs of various carrier aggregation combinations.

[0004] The technical solution of this application embodiment is implemented as follows:

[0005] In a first aspect, embodiments of this application provide an antenna switching circuit, including at least two receiving branches, a first phase-shifting branch, and a controller, wherein each of the at least two receiving branches and the first phase-shifting branch are connected to the same antenna; each receiving branch is used to receive a radio frequency signal in one frequency band; the controller is used to adjust the first phase-shifting branch such that its input impedance to the second sub-radio frequency signal is greater than the preset threshold when the antenna is connected to a downlink carrier-aggregated radio frequency signal that includes at least a first frequency band and a second frequency band, and the input impedance of the first receiving branch corresponding to the first sub-radio frequency signal of the first frequency band to the second sub-radio frequency signal of the second frequency band is less than or equal to a preset threshold, thereby using the first phase-shifting branch to receive the first sub-radio frequency signal; and using the second receiving branch corresponding to the second sub-radio frequency signal to receive the second sub-radio frequency signal; the downlink carrier-aggregated radio frequency signal includes the first sub-radio frequency signal and the second sub-radio frequency signal.

[0006] In some embodiments, each of the receiving branches includes: a receiving switch and a receiving filter; wherein one end of the receiving switch is connected to the antenna and the other end is connected to the receiving filter; The first phase-shift modulation branch includes: a first modulation switch, a phase-shift modulation network, at least two second modulation switches, and a receiving filter included in each of the receiving branches. One end of the first modulation switch is connected to the antenna, and the other end is connected to one end of the phase-shift modulation network. The other end of the phase-shift modulation network is connected to one end of each of the second modulation switches. The other end of each second modulation switch is connected to a receiving filter. The controller is configured to, when the antenna receives the downlink carrier aggregation radio frequency signal and the input impedance of the receiving filter included in the first receiving branch for the second sub-radio frequency signal is less than or equal to a preset threshold, control the receiving switches in the first receiving branch to turn off and control the first modulation switch and the second modulation switch corresponding to the first frequency band to close. It also adjusts the phase-shift modulation network such that the input impedance of the receiving filter connected to the second modulation switch corresponding to the first frequency band for the second sub-radio frequency signal is greater than the preset threshold, so as to use the first phase-shift modulation branch to receive the first sub-radio frequency signal; and controls the receiving switches included in the second receiving branch to close, so as to use the second receiving branch to receive the second sub-radio frequency signal.

[0007] In some embodiments, the phase-shifting adjustment network includes: a first reactor component, a second reactor component, and a third reactor component, wherein the first reactor component is connected to the first adjustment switch at a first node; the first reactor component is connected to the second reactor component and the third reactor component at a second node; the other end of the second reactor component is connected to ground; the other end of the third reactor component is connected to the at least two second adjustment switches at a third node; wherein the first reactor component and the third reactor component contain the same type of reactor element; the second reactor component and the first reactor component and the third reactor component contain different types of reactor elements.

[0008] In some embodiments, the first reactor component includes: at least one set of capacitors connected in series and a first control switch connected in parallel between the first node and the second node, and a second control switch connected in parallel between the first node and the second node; the third reactor component has the same structure as the first reactor component; the second reactor component includes at least one inductor.

[0009] In some embodiments, the controller is configured to, when the antenna is connected to a single-frequency radio frequency signal containing a third frequency band, control the receiving switch included in the receiving branch corresponding to the third frequency band to close, and use the receiving branch corresponding to the third frequency band to receive the single-frequency radio frequency signal; and control the first adjustment switch and the second adjustment switch to be in an off state so that the first phase shift adjustment branch is not enabled.

[0010] In some embodiments, the first phase-shifting adjustment branch further includes: a third adjustment switch and a fourth adjustment switch, wherein the third adjustment switch is connected between the first node and ground; the fourth adjustment switch is connected between the third node and ground; the controller is configured to control the third adjustment switch and the fourth adjustment switch to close when the antenna is connected to the single-frequency radio frequency signal, thereby pulling down the potential of the first node and the third node in the first phase-shifting adjustment branch to ground.

[0011] In some embodiments, the antenna switching circuit further includes a second phase-shift adjustment branch; the second phase-shift adjustment branch is also connected to the antenna; the controller is further configured to, when the antenna is connected to the downlink carrier aggregation radio frequency signal, and the input impedance of the receiving filter included in the first receiving branch to the second sub-radio frequency signal is less than or equal to the preset threshold, and the input impedance of the receiving filter included in the second receiving branch to the first sub-radio frequency signal is less than or equal to the preset threshold, adjust the first phase-shift adjustment branch and the second phase-shift adjustment branch such that the input impedance of the first phase-shift adjustment branch to the second sub-radio frequency signal is greater than the preset threshold and the input impedance of the receiving filter included in the second phase-shift adjustment branch corresponding to the second sub-radio frequency signal to the first sub-radio frequency signal is greater than the preset threshold, so as to use the first phase-shift adjustment branch to receive the first sub-radio frequency signal and use the second phase-shift adjustment branch to receive the second sub-radio frequency signal.

[0012] In some embodiments, the downlink carrier aggregation radio frequency signal further includes a third sub-radio frequency signal corresponding to the fourth frequency band; the antenna switching circuit further includes a third phase shift adjustment branch; the third phase shift adjustment branch is also connected to the antenna; the controller is further configured to adjust the first phase shift adjustment branch and the third phase shift adjustment branch when the input impedance of the receiving filter included in the first receiving branch for the second sub-radio frequency signal is less than or equal to the preset threshold, and the input impedance of the receiving filter included in the third receiving branch corresponding to the third sub-radio frequency signal for the second sub-radio frequency signal or for the first sub-radio frequency signal is less than or equal to the preset threshold, such that the input impedance of the first phase shift adjustment branch for the second sub-radio frequency signal is greater than the preset threshold and the input impedance of the receiving filter included in the third phase shift adjustment branch corresponding to the fourth frequency band for the second sub-radio frequency signal or for the first sub-radio frequency signal is greater than the preset threshold, so as to use the first phase shift adjustment branch to receive the first sub-radio frequency signal, use the third phase shift adjustment branch to receive the third sub-radio frequency signal, and use the second receiving branch to receive the second sub-radio frequency signal.

[0013] Secondly, embodiments of this application also provide a signal receiving method applied to an antenna switching circuit including a controller; the antenna switching circuit further includes at least two receiving branches and a first phase-shift adjustment branch; the method includes: when the accessed downlink carrier aggregation radio frequency signal includes a first frequency band and a second frequency band, and the input impedance of the first receiving branch corresponding to the first sub-radio frequency signal of the first frequency band is less than or equal to a preset threshold in the second frequency band, adjusting the first phase-shift adjustment branch such that the input impedance of the first phase-shift adjustment branch is greater than the preset threshold in the second frequency band, so as to use the first phase-shift adjustment branch to receive the first sub-radio frequency signal; and using the second receiving branch corresponding to the second sub-radio frequency signal of the second frequency band to receive the second sub-radio frequency signal; the downlink carrier aggregation radio frequency signal includes the first sub-radio frequency signal and the second sub-radio frequency signal.

[0014] In some embodiments, the controller includes a register; the method further includes: reading the register to obtain operating parameters of the antenna switching circuit; and determining, based on the operating parameters, that the downlink carrier aggregation radio frequency signal includes the first frequency band and the second frequency band.

[0015] The embodiments of this application have the following beneficial effects: By setting a first phase-shift adjustment branch, when the input impedance of the first receiving branch corresponding to the first frequency band to the second frequency band is less than or equal to a preset threshold (i.e., low impedance state), the first phase-shift adjustment branch is adjusted so that the input impedance of the first phase-shift adjustment branch to the second frequency band is greater than the preset threshold (i.e., high impedance state), and the first phase-shift adjustment branch is used to receive the first sub-RF signal corresponding to the first frequency band. At this time, the first phase-shift adjustment branch can reflect the second sub-RF signal corresponding to the second frequency band to the greatest extent to prevent the second sub-RF signal from leaking to the first receiving branch, thereby affecting the carrier aggregation performance of the second sub-RF signal of the second frequency band and causing CA desense. Attached Figure Description

[0016] Figure 1 This is an exemplary structural diagram of an antenna switching circuit provided in an embodiment of this application;

[0017] Figure 2 This is another exemplary structural diagram of the antenna switching circuit provided in the embodiments of this application;

[0018] Figure 3 This is another exemplary structural diagram of the antenna switch circuit provided in the embodiments of this application;

[0019] Figure 4 This is a flowchart illustrating the radio frequency signal receiving method provided in an embodiment of this application.

[0020] It should be noted that the terms "first" and "second" mentioned above are only used to distinguish between different options and do not represent the degree of superiority or inferiority of the options or their priority in the implementation process. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is 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.

[0023] In the following description, the terms "first, second, third" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0024] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the embodiments of this application is for descriptive purposes only and is not intended to limit the scope of this application.

[0025] The embodiments provided in this application can cleverly decouple the reception of RF signals in single-band state from the reception of RF signals in CA state by adding one or more phase shift adjustment branches in the antenna switching circuit. The phase shift adjustment branch only works when the RF signal is received in CA state, which eliminates the need for a passive phase shifter network connected in series in the receiving branch corresponding to each frequency band. This avoids the insertion loss caused by the passive phase shifter network, improves the performance of single-band signal reception, and greatly saves costs.

[0026] Specifically, the technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See Figure 1 This diagram illustrates a structural schematic of an exemplary antenna switch circuit provided in an embodiment of this application. Figure 1As shown, the antenna switching circuit 100 may include at least two receiving branches 10, a first phase shift adjustment branch 20, and a controller 30, wherein each of the at least two receiving branches 10 (e.g., 10-1, 10-2, 10-3, ...) and the first phase shift adjustment branch 20 are connected to the same antenna 200; each receiving branch (e.g., 10-1, 10-2, 10-3, ...) is used to receive radio frequency signals in one frequency band; The controller 30 can be used to adjust the first phase-shifting branch 20 such that the input impedance of the first receiving branch 101 corresponding to the first sub-radio signal of the first frequency band to the second sub-radio signal of the second frequency band is greater than the preset threshold when the antenna 200 is connected to a downlink carrier aggregation radio frequency signal including at least a first frequency band and a second frequency band, and the input impedance of the first receiving branch 101 corresponding to the first sub-radio signal of the first frequency band to the second sub-radio signal of the second frequency band is less than or equal to a preset threshold, so that the input impedance of the first phase-shifting branch 20 to the second sub-radio signal is greater than the preset threshold, and the first phase-shifting branch 20 is used to receive the first sub-radio signal; and the second receiving branch 102 corresponding to the second sub-radio signal is used to receive the second sub-radio signal; the downlink carrier aggregation radio frequency signal includes the first sub-radio signal and the second sub-radio signal.

[0028] It should be noted that the antenna switching circuit 100 can be an electronic switching circuit, whose core function is to switch between a single antenna and multiple radio frequency circuits of different frequency bands, so that one antenna can be shared by multiple transmitting or receiving channels. The antenna switching circuit 100 disclosed in this application embodiment may include at least two receiving branches 10, a first phase shift adjustment branch 20, and a controller 30. Each receiving branch (e.g., 10-1, 10-2, 10-3, ...) is used to receive radio frequency signals of one frequency band, while different receiving branches (e.g., 10-1, 10-2, 10-3, ...) can receive radio frequency signals of different frequency bands, for example... Figure 1 The receiving branches 10-1, 10-2, and 10-3 shown receive frequency bands Band_A, Band_B, and Band_C, respectively.

[0029] In this configuration, the first phase-shift adjustment branch 20 acts as a backup receiving branch. It is activated only when the received RF signal is a downlink carrier-aggregated RF signal, and the input impedance of the receiving branch (e.g., the first receiving branch 101) corresponding to a sub-RF signal (e.g., the first sub-RF signal) in one frequency band (e.g., the first frequency band) is less than or equal to a preset threshold for the input impedance of a sub-RF signal (e.g., the second sub-RF signal) in another frequency band (e.g., the second frequency band). The first phase-shift adjustment branch 20 is adjusted so that its input impedance to the second sub-RF signal in the second frequency band is greater than the preset threshold. This allows the first phase-shift adjustment branch 20 to receive the first sub-RF signal corresponding to the first frequency band, replacing the first receiving branch 101. This ensures that the branch receiving the first sub-RF signal receives only the first sub-RF signal and not the second sub-RF signal, thus preventing the second sub-RF signal from leaking into the branch receiving the first sub-RF signal.

[0030] In practical applications, the controller 30 is used to determine whether the first phase-shifting branch 20 needs to be activated. Specifically, the controller 30 may include a register for storing the operating parameters of the antenna switching circuit 100. These operating parameters can characterize the frequency bands included in the user-specified downlink carrier aggregation RF signal and the input impedance of the receiving branch corresponding to each frequency band to other frequency bands besides its own (whether it is greater than a preset threshold or less than or equal to a preset threshold). The controller 30 determines the frequency bands included in the RF signal received by the antenna 200 and whether the first phase-shifting branch 20 needs to be activated by reading the operating parameters in the register. It should be noted that whether the RF signal received by the antenna 200 is a downlink carrier aggregation RF signal or a single-frequency RF signal, which frequency bands the downlink carrier aggregation RF signal includes, and whether the first phase-shifting branch 20 needs to be activated are all set by the user. Furthermore, the reception modes supported by the antenna switch circuit 100 in an electronic device are pre-configured before the electronic device leaves the factory. During use, the user sends a setting code to the main controller of the electronic device containing the antenna switch circuit 100 via the input port. The main controller forwards the setting code to the register of the antenna switch circuit 100. The controller 30 reads the setting code (containing operating parameters) from the register and sets the device to the target reception mode based on the read setting code (the target reception mode is, for example, as follows). Figure 4 The receiving method shown uses a receiving mode in which the first sub-RF signal is received by the first phase-shifting adjustment branch 20 and the second sub-RF signal is received by the second receiving branch 102, and then the antenna switching circuit 100 is used to receive the RF signal.

[0031] Here, the preset threshold can be determined based on the user's required CA sensitivity (i.e., CA desense). In other words, the preset threshold can be calculated based on the maximum amount of signal leakage from the second sub-RF signal of the second frequency band in the branch receiving the first sub-RF signal, as required by the user. For example, assuming that the user requires the leakage of the second sub-RF signal in the branch receiving the first sub-RF signal to not exceed 5%, the input impedance of the branch receiving the first sub-RF signal can be calculated based on the condition of 5% leakage of the second sub-RF signal, and this value is the aforementioned preset threshold. In practical applications, the situation where the input impedance of the first receiving branch 101 corresponding to the first sub-RF signal of the first frequency band to the second sub-RF signal of the second frequency band is less than or equal to the preset threshold can be referred to as the input impedance of the receiving branch corresponding to the first frequency band falling into the low impedance region in the second frequency band. At this time, the amount of the second sub-RF signal leaking into the branch receiving the first sub-RF signal does not meet the requirements. Conversely, the situation where the input impedance of the first receiving branch 101 corresponding to the first sub-RF signal of the first frequency band to the second sub-RF signal of the second frequency band is greater than a preset threshold can be referred to as the input impedance of the receiving branch corresponding to the first frequency band entering the high impedance region in the second frequency band. At this time, the amount of the second sub-RF signal leaking to the branch receiving the first sub-RF signal meets the requirements.

[0032] Based on the foregoing description, the core of the technical solution provided by this application embodiment is as follows: when the input impedance of the first receiving branch 101 to the second frequency band does not meet the requirements, the first phase shift adjustment branch 20 is activated and adjusted so that the input impedance of the first phase shift adjustment branch 20 to the second frequency band meets the requirement of being greater than a preset threshold. In this way, the second sub-RF signal is prevented from leaking to the branch receiving the first sub-RF signal as much as possible, thereby improving the CA detection of the second frequency band.

[0033] Here, the first frequency band and the second frequency band can be any two frequency bands from the at least two receiving branches included in the antenna switching circuit 100. It should be noted that in practical applications, the same receiving branch can also receive signals from two frequency bands. For example, Band 66 and Band 3 share a single receiving branch. Therefore, the signals of the first and second frequency bands mentioned in this embodiment can be signals from two frequency bands that do not share a receiving branch, such as Band A and Band B.

[0034] In some embodiments, such as Figure 1As shown, each of the receiving branches (e.g., 10-1, 10-2, 10-3, ...) may include: a receiving switch 1011 and a receiving filter 1012; wherein, one end of the receiving switch 1011 is connected to the antenna 200, and the other end is connected to the receiving filter 1012. The first phase-shifting branch 20 may include: a first adjustment switch 201, a phase-shifting network 202, at least two second adjustment switches 203, and a receiving filter 1012 included in each of the receiving branches (e.g., 10-1, 10-2, 10-3, ...). One end of the first adjustment switch 201 is connected to the antenna 200, and the other end is connected to one end of the phase-shifting network 202. The other end of the phase-shifting network 202 is connected to one end of each of the second adjustment switches 203. The other end of each of the second adjustment switches 203 is connected to one of the receiving filters 1012. The controller 30 is configured to receive the downlink carrier aggregation radio frequency signal at the antenna 200, and the first receiving branch 101 includes... When the input impedance of the receiving filter 1012 to the second sub-RF signal is less than or equal to the preset threshold, the receiving switch 1011 in the first receiving branch 101 is turned off, and the first adjustment switch 201 and the second adjustment switch 203 corresponding to the first frequency band are closed. The phase shift adjustment network 202 is adjusted so that the input impedance of the receiving filter 1012 connected to the second adjustment switch 203 corresponding to the first frequency band to the second sub-RF signal is greater than the preset threshold, so as to use the first phase shift adjustment branch 20 to receive the first sub-RF signal; and the receiving switch 1011 included in the second receiving branch 102 is closed, so as to use the second receiving branch 102 to receive the second sub-RF signal.

[0035] Here, the receiving filter 1012 connected to the second adjustment switch 203 corresponding to each frequency band in the first phase shift adjustment branch 20 is the receiving filter included in the receiving branch corresponding to the same frequency band in at least two receiving branches. That is, the receiving filter 1012 included in each of the at least two receiving branches is multiplexed as the receiving filter connected to the second adjustment switch 203 corresponding to the same frequency band in the first phase shift adjustment branch 20, thereby reducing costs. The second adjustment switch corresponding to the first frequency band can refer to the second adjustment switch connected to the receiving filter 1012 included in the receiving branch corresponding to the first frequency band. The at least two second adjustment switches 203 can be implemented using single-pole multi-throw switches.

[0036] Based on this, when the antenna 200 receives the downlink carrier aggregation RF signal and the input impedance of the receiving filter 1012 included in the first receiving branch 101 for the second sub-RF signal of the second frequency band is less than or equal to a preset threshold, the controller 30 can control the receiving switch 1011 of the first receiving branch 101 to turn off, control the first adjustment switch 201 and the second adjustment switch 203 corresponding to the first frequency band to close, start the first phase shift adjustment branch, and adjust the phase shift adjustment network 202 so that the input impedance of the receiving filter 1012 connected to the second adjustment switch 203 corresponding to the first frequency band for the second frequency band is greater than the preset threshold. At this time, the branch corresponding to the second adjustment switch of the first frequency band in the first phase shift adjustment branch is used to receive the first sub-RF signal instead of the first receiving branch 101 receiving the first sub-RF signal. This prevents the second sub-RF signal from leaking too much to the branch receiving the first sub-RF signal, thereby improving the CA desense of the second sub-RF signal of the second frequency band.

[0037] In some embodiments, such as Figure 2 As shown, the phase-shifting adjustment network 202 may include: a first reactor component 2021, a second reactor component 2022, and a third reactor component 2023, wherein the first reactor component 2021 is connected to the first adjustment switch 201 at a first node P; the first reactor component 2021, the second reactor component 2022, and the third reactor component 2023 are connected to a second node Q; the other end of the second reactor component 2022 is connected to ground; the other end of the third reactor component 2023 is connected to the at least two second adjustment switches 203 at a third node R; wherein the first reactor component 2021 and the third reactor component 2023 contain the same type of reactor element; the second reactor component 2022, the first reactor component 2021, and the third reactor component 2023 contain different types of reactor elements.

[0038] For example, Figure 2 As shown, the first reactor component 2021 may include: at least one set of capacitors C connected in series between the first node P and the second node Q, a first control switch SW1, and a second control switch SW2 connected in parallel between the first node P and the second node Q; the third reactor component 2023 has the same structure as the first reactor component 2021; the second reactor component 2022 may include at least one inductor L. It should be noted that the capacitors and inductors in the phase-shifting network 202 can be implemented in an integrated circuit chip (DIE), resulting in a simple circuit structure.

[0039] In some embodiments, the controller 30 may also be used to control the receiving switch included in the receiving branch corresponding to the third frequency band to close when the antenna 200 is connected to a single-frequency radio frequency signal including the third frequency band, so as to receive the single-frequency radio frequency signal using the receiving branch corresponding to the third frequency band; and to control the first adjustment switch and the second adjustment switch to be in the off state so as to prevent the first phase shift adjustment branch 20 from being enabled.

[0040] In other words, when the antenna 200 receives a single-frequency radio frequency signal, the single-frequency radio frequency signal can be received only through the receiving branch corresponding to the third frequency band, without needing to activate the first phase shift adjustment branch 20.

[0041] In some embodiments, the first phase-shifting branch 20 may further include a third adjustment switch 204 and a fourth adjustment switch 205, wherein the third adjustment switch 204 is connected between the first node P and ground; the fourth adjustment switch 205 is connected between the third node R and ground; the controller 30 is configured to control the third adjustment switch 204 and the fourth adjustment switch 205 to close when the antenna 200 receives the single-frequency radio frequency signal, thereby pulling down the first node P and the third node R in the first phase-shifting branch 20 to ground. This effectively reduces the impact of the first phase-shifting branch 20 on the single-frequency radio frequency signal reception performance. Similarly, each receiving branch may also include a switch connecting the connection line between the receiving switch and the receiving filter to ground, so as to pull down the potential of the key node in the receiving branch to ground when the receiving branch is not in use, thereby effectively reducing the impact of the receiving branch on the performance of other receiving branches.

[0042] In some embodiments, the antenna switching circuit 100 further includes a second phase-shift adjustment branch; the second phase-shift adjustment branch is also connected to the antenna; the controller 30 is further configured to, when the antenna 200 is connected to the downlink carrier aggregation radio frequency signal, and the input impedance of the receiving filter 1012 included in the first receiving branch 101 to the second sub-radio frequency signal is less than or equal to the preset threshold, and the input impedance of the receiving filter 1012 included in the second receiving branch 102 to the first sub-radio frequency signal is less than or equal to the preset threshold, adjust the first phase-shift adjustment branch 20 and the second phase-shift adjustment branch such that the input impedance of the first phase-shift adjustment branch 20 to the second sub-radio frequency signal is greater than the preset threshold and the input impedance of the receiving filter 1012 included in the second phase-shift adjustment branch corresponding to the second sub-radio frequency signal to the first sub-radio frequency signal is greater than the preset threshold, so as to use the first phase-shift adjustment branch 20 to receive the first sub-radio frequency signal and use the second phase-shift adjustment branch to receive the second sub-radio frequency signal.

[0043] It should be noted that the structure of the second phase-shifting branch can be the same as that of the first phase-shifting branch 20. In practical applications, the first receiving branch 101 corresponding to the first sub-RF signal of the first frequency band will leak the second sub-RF signal, and the second receiving branch 102 corresponding to the second sub-RF signal will also leak the first sub-RF signal. In this case, two phase-shifting branches need to be designed, such as the first phase-shifting branch 20 and the second phase-shifting branch. At this time, both the first phase-shifting branch 20 and the second phase-shifting branch will be activated and adjusted so that the first phase-shifting branch 20 will not leak the second sub-RF signal and the second phase-shifting branch will not leak the first sub-RF signal. Thus, the first phase-shifting branch 20 is used to receive the first sub-RF signal, and the second phase-shifting branch is used to receive the second sub-RF signal, while the first receiving branch 101 and the second receiving branch 102 are turned off, thereby improving the CA detection of the first and second frequency bands.

[0044] In some embodiments, the downlink carrier aggregation radio frequency signal further includes a third sub-radio frequency signal corresponding to the fourth frequency band; the antenna switching circuit 100 further includes a third phase shift adjustment branch; the third phase shift adjustment branch is also connected to the antenna; the controller is further configured to adjust the first phase shift adjustment branch and the third phase shift adjustment branch when the input impedance of the receiving filter included in the first receiving branch for the second sub-radio frequency signal is less than or equal to the preset threshold, and the input impedance of the receiving filter included in the third receiving branch corresponding to the third sub-radio frequency signal for the second sub-radio frequency signal or for the first sub-radio frequency signal is less than or equal to the preset threshold, so that the input impedance of the first phase shift adjustment branch for the second sub-radio frequency signal is greater than the preset threshold and the input impedance of the receiving filter included in the third phase shift adjustment branch corresponding to the fourth frequency band for the second sub-radio frequency signal or for the first sub-radio frequency signal is greater than the preset threshold, so as to use the first phase shift adjustment branch to receive the first sub-radio frequency signal, use the third phase shift adjustment branch to receive the third sub-radio frequency signal, and use the second receiving branch to receive the second sub-radio frequency signal.

[0045] It should be noted that the structure of the third phase-shifting adjustment branch can be the same as that of the first phase-shifting adjustment branch 20. In practical applications, the downlink carrier aggregation RF signal received by antenna 200 may also include a third sub-RF signal of the fourth frequency band. If the input impedance of the receiving filter in the receiving branch corresponding to the third sub-RF signal to the first or second sub-RF signal is less than or equal to a preset threshold, and the input impedance of the receiving filter 1012 in the first receiving branch 101 to the second sub-RF signal is less than or equal to a preset threshold, then the first phase-shift adjustment branch 20 and the third phase-shift adjustment branch need to be activated. The first phase-shift adjustment branch 20 is adjusted so that the input impedance of the receiving filter in the first phase-shift adjustment branch corresponding to the first frequency band to the first sub-RF signal is greater than the preset threshold. Similarly, the third phase-shift adjustment branch is adjusted so that the input impedance of the receiving filter in the third phase-shift adjustment branch corresponding to the fourth frequency band to the first or second sub-RF signal is greater than the preset threshold. This allows the first phase-shift adjustment branch 20 to receive the first sub-RF signal to improve the CA detection of the second frequency band, and the third phase-shift adjustment branch to receive the third sub-RF signal to improve the CA detection of the first or second frequency band. desense.

[0046] It should be noted that the aforementioned second and third phase-shift adjustment branches are merely different names used to illustrate two different scenarios. In practical applications, the antenna switching circuit 100 may include one, two, or more phase-shift adjustment branches. Specifically, the number of phase-shift adjustment branches in the antenna switching circuit can be determined by the designer based on the performance of the receiving filter corresponding to each frequency band.

[0047] To understand this application, exemplarily, such as Figure 3 As shown, it illustrates an exemplary structural schematic diagram of an antenna switching circuit 100. (As shown...) Figure 3 As shown, the antenna switching circuit 100 may include: six receiving branches, namely receiving branches for band 7, band 41, band 40, bands 66 & 3, bands 34 & 39, and band 25, corresponding to receiving switches ASM_B7, ASM_B41, ASM_B40, ASM_B66 & 3, ASM_B34 & 39, and ASM_B25, respectively, and a switch between the connection line between the receiving switch and the receiving filter of each receiving branch and ground. The first reactance component 2021 of the phase shift adjustment network 202 includes two sets of first control switches SW1 and capacitor C connected in series, and also includes a second control switch SW2. The second reactance component 2022 includes an inductor. The third reactance component 2023 includes two sets of first control switches SW1 and capacitor C connected in series, and also includes a second control switch SW2. Figure 3In the antenna switch circuit 100 shown, when single-band operation is in operation, the first phase-shifting adjustment branch 20 is not in operation, that is, the first adjustment switch 201 and all the second adjustment switches 203 in the first phase-shifting adjustment branch 20 are open; the third adjustment switch 204 and the fourth adjustment switch 205 are pulled down to ground. At this time, the added first phase-shifting adjustment branch 20 has a negligible impact on each receiving branch. When operating in CA mode, for example, in the case of Band66+Band3+Band41 CA, if the input impedance of the filter in Band41 falls into the low impedance region in the Band66&3 frequency band, the ANT_MHB connection to the receiving switch ASM_B41 is disconnected. Instead, the first phase-shifting adjustment branch 20 is activated. Specifically, the first adjustment switch 201 is closed, the second adjustment switch 203 corresponding to Band41 is closed, and the third adjustment switch 204 and the fourth adjustment switch 205 are disconnected. Furthermore, the capacitors and inductors in the phase-shifting adjustment network 202 can form a T-type / L-type matching network. Without excessively worsening its insertion loss, the input impedance of the connected receiving filter is adjusted to a high impedance state in the Band66&3 frequency band, preventing the signal in the Band66&3 frequency band from leaking to the receiving branch corresponding to Band41 through the switch, thereby affecting the CA performance of Band66&3 and causing CA performance desense. Among them, the capacitors can be designed as switched capacitor arrays on the DIE. Through the logic control of the Mobile Industry Processor Interface (MIPI), the input impedance conversion in the receiving branches corresponding to multiple bands of different forms can be realized to cover the needs of various CA combinations.

[0048] The antenna switching circuit 100 provided in this application embodiment has the following beneficial effects: By setting one or more phase-shifting adjustment branches, the receiving mode of single-frequency RF signals and the receiving mode of carrier-aggregated RF signals are cleverly decoupled. The phase-shifting adjustment branches only work when the filter input impedance is less than or equal to a preset threshold, that is, the reflection coefficient of the input impedance is small, and have almost no impact on the normal path (receiving branch), effectively reducing the impact of CA performance optimization on the single-band signal receiving performance and providing flexible control. Furthermore, by using only a small number of phase-shifting adjustment branches, the switches in the phase-shifting network can be switched on the DIE via MIPI control. Different matching network types and matching values ​​can be quickly switched when different CA combinations are used to achieve effective input impedance adjustment for multiple sets of frequency band CAs, eliminating the need for multiple sets of phase-shifting adjustment networks on multiple receiving branches and greatly reducing costs. In addition, the capacitors and switches used in the phase-shifting adjustment network can all be implemented on the DIE, resulting in a simple circuit structure.

[0049] This application embodiment also provides a signal receiving method, which, when applied to an antenna switching circuit 100, may include a controller; the antenna switching circuit further includes at least two receiving branches and a first phase shift adjustment branch; as shown in the example Figure 4 As shown, the method includes the following steps 401.

[0050] Step 401: When the accessed downlink carrier aggregation radio frequency signal includes a first frequency band and a second frequency band, and the input impedance of the first receiving branch corresponding to the first sub-radio frequency signal of the first frequency band is less than or equal to a preset threshold in the second frequency band, adjust the first phase shift adjustment branch so that the input impedance of the first phase shift adjustment branch is greater than the preset threshold in the second frequency band, so as to use the first phase shift adjustment branch to receive the first sub-radio frequency signal; and use the second receiving branch corresponding to the second sub-radio frequency signal of the second frequency band to receive the second sub-radio frequency signal; the downlink carrier aggregation radio frequency signal includes the first sub-radio frequency signal and the second sub-radio frequency signal.

[0051] In some embodiments, the controller may include a register; the method further includes: reading the register to obtain the operating parameters of the antenna switching circuit; and determining, based on the operating parameters, that the downlink carrier aggregation radio frequency signal includes the first frequency band and the second frequency band.

[0052] It should be noted that the receiving method provided in this application embodiment is based on the antenna switch circuit 100 mentioned above. The steps for receiving have also been described above. Therefore, for the specific steps in the receiving method, please refer to the above understanding and they will not be repeated here.

[0053] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. An antenna switching circuit, characterized in that, include: The system includes at least two receiving branches, a first phase-shifting branch, and a controller, wherein each of the at least two receiving branches and the first phase-shifting branch are connected to the same antenna; each receiving branch is used to receive radio frequency signals in one frequency band. The controller is configured to, when the antenna is connected to a downlink carrier-aggregated radio frequency signal comprising at least a first frequency band and a second frequency band, and the input impedance of the first receiving branch corresponding to the first sub-radio frequency signal of the first frequency band to the second sub-radio frequency signal of the second frequency band is less than or equal to a preset threshold, adjust the first phase-shifting branch such that the input impedance of the first phase-shifting branch to the second sub-radio frequency signal is greater than the preset threshold, and use the first phase-shifting branch to receive the first sub-radio frequency signal; and use the second receiving branch corresponding to the second sub-radio frequency signal to receive the second sub-radio frequency signal; wherein the downlink carrier-aggregated radio frequency signal comprises the first sub-radio frequency signal and the second sub-radio frequency signal.

2. The antenna switching circuit according to claim 1, characterized in that, Each of the receiving branches includes: a receiving switch and a receiving filter; wherein one end of the receiving switch is connected to the antenna and the other end is connected to the receiving filter; The first phase-shifting branch includes: a first adjustment switch, a phase-shifting network, at least two second adjustment switches, and a receiving filter included in each of the receiving branches, wherein one end of the first adjustment switch is connected to the antenna, and the other end is connected to one end of the phase-shifting network; the other end of the phase-shifting network is connected to one end of each of the second adjustment switches; and the other end of each of the second adjustment switches is connected to one of the receiving filters. The controller is configured to, when the antenna receives the downlink carrier aggregation radio frequency signal and the input impedance of the receiving filter included in the first receiving branch to the second sub-radio frequency signal is less than or equal to the preset threshold, control the receiving switch in the first receiving branch to turn off and control the first adjustment switch and the second adjustment switch corresponding to the first frequency band to close, and adjust the phase shift adjustment network such that the input impedance of the receiving filter connected to the second adjustment switch corresponding to the first frequency band to the second sub-radio frequency signal is greater than the preset threshold, so as to use the first phase shift adjustment branch to receive the first sub-radio frequency signal; and control the receiving switch included in the second receiving branch to close, so as to use the second receiving branch to receive the second sub-radio frequency signal.

3. The antenna switching circuit according to claim 2, characterized in that, The phase-shifting adjustment network includes: a first reactor component, a second reactor component, and a third reactor component, wherein the first reactor component is connected to the first adjustment switch at a first node; the first reactor component is connected to the second reactor component and the third reactor component at a second node; the other end of the second reactor component is connected to ground; and the other end of the third reactor component is connected to the at least two second adjustment switches at a third node. The first reactor component and the third reactor component contain the same type of reactor element; the second reactor component, the first reactor component, and the third reactor component contain different types of reactor elements.

4. The antenna switching circuit according to claim 3, characterized in that, The first reactor component includes: at least one set of series capacitors connected in parallel between the first node and the second node, a first control switch, and a second control switch connected in parallel between the first node and the second node; The third reactor component has the same structure as the first reactor component; The second reactance component includes at least one inductor.

5. The antenna switching circuit according to claim 3, characterized in that, The controller is configured to, when the antenna is connected to a single-frequency radio frequency signal containing a third frequency band, control the receiving switch included in the receiving branch corresponding to the third frequency band to close, and use the receiving branch corresponding to the third frequency band to receive the single-frequency radio frequency signal; and control the first adjustment switch and the second adjustment switch to be in the off state so that the first phase shift adjustment branch is not enabled.

6. The antenna switching circuit according to claim 5, characterized in that, The first phase-shifting adjustment branch further includes: a third adjustment switch and a fourth adjustment switch, wherein the third adjustment switch is connected between the first node and ground; the fourth adjustment switch is connected between the third node and ground; the controller is used to control the third adjustment switch and the fourth adjustment switch to close when the antenna is connected to the single-frequency radio frequency signal, so as to pull down the potential of the first node and the third node in the first phase-shifting adjustment branch to ground.

7. The antenna switching circuit according to claim 2, characterized in that, The antenna switching circuit further includes a second phase-shift adjustment branch; the second phase-shift adjustment branch is also connected to the antenna. The controller is further configured to, when the antenna is connected to the downlink carrier aggregation radio frequency signal, and the input impedance of the receiving filter included in the first receiving branch to the second sub-radio frequency signal is less than or equal to the preset threshold, and the input impedance of the receiving filter included in the second receiving branch to the first sub-radio frequency signal is less than or equal to the preset threshold, adjust the first phase shift adjustment branch and the second phase shift adjustment branch such that the input impedance of the first phase shift adjustment branch to the second sub-radio frequency signal is greater than the preset threshold, and the input impedance of the receiving filter included in the second phase shift adjustment branch corresponding to the second sub-radio frequency signal to the first sub-radio frequency signal is greater than the preset threshold, so as to use the first phase shift adjustment branch to receive the first sub-radio frequency signal and use the second phase shift adjustment branch to receive the second sub-radio frequency signal.

8. The antenna switching circuit according to claim 2, characterized in that, The downlink carrier aggregation radio frequency signal also includes a third sub-radio frequency signal corresponding to the fourth frequency band; the antenna switching circuit also includes a third phase shift adjustment branch; the third phase shift adjustment branch is also connected to the antenna; The controller is further configured to, when the input impedance of the receiving filter included in the first receiving branch for the second sub-RF signal is less than or equal to the preset threshold, and the input impedance of the receiving filter included in the third receiving branch corresponding to the third sub-RF signal for the second sub-RF signal or for the first sub-RF signal is less than or equal to the preset threshold, adjust the first phase shift adjustment branch and the third phase shift adjustment branch such that the input impedance of the first phase shift adjustment branch for the second sub-RF signal is greater than the preset threshold, and the input impedance of the receiving filter included in the third phase shift adjustment branch corresponding to the fourth frequency band for the second sub-RF signal or for the first sub-RF signal is greater than the preset threshold, so as to use the first phase shift adjustment branch to receive the first sub-RF signal, use the third phase shift adjustment branch to receive the third sub-RF signal, and use the second receiving branch to receive the second sub-RF signal.

9. A signal receiving method, characterized in that, The method includes: an antenna switching circuit comprising a controller; the antenna switching circuit further comprising at least two receiving branches and a first phase shift adjustment branch; the method comprising: When the accessed downlink carrier aggregation radio frequency signal includes a first frequency band and a second frequency band, and the input impedance of the first receiving branch corresponding to the first sub-radio frequency signal of the first frequency band is less than or equal to a preset threshold in the second frequency band, the first phase shift adjustment branch is adjusted so that the input impedance of the first phase shift adjustment branch is greater than the preset threshold in the second frequency band, so as to receive the first sub-radio frequency signal using the first phase shift adjustment branch; and to receive the second sub-radio frequency signal using the second receiving branch corresponding to the second sub-radio frequency signal of the second frequency band; the downlink carrier aggregation radio frequency signal includes the first sub-radio frequency signal and the second sub-radio frequency signal.

10. The method according to claim 9, characterized in that, The controller includes registers; the method further includes: Read the register to obtain the operating parameters of the antenna switching circuit; Based on the operating parameters, the downlink carrier aggregation radio frequency signal is determined to include the first frequency band and the second frequency band.

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