Radio frequency circuit and electronic device

Abstract

The utility model relates to electronic equipment technical field discloses a kind of radio frequency circuit and electronic equipment, radio frequency circuit includes: cellular communication antenna;First GPS antenna;Second GPS antenna, compared with first GPS antenna, with higher spatial isolation between the cellular communication antenna;Radio frequency switching circuit, the input of the radio frequency switching circuit is connected the first GPS antenna and second GPS antenna, the output of the radio frequency switching circuit is connected GPS demodulator;Control module is connected with cellular communication module, for according to the interference state of cellular communication module output, control the radio frequency switching circuit switching and the connection state of the first GPS antenna and second GPS antenna. By the interference state of cellular communication module output dynamic adjustment antenna path, to enhance overall anti-interference capability. It is favorable to provide more stable GPS receiving path in the scene where cellular interference exists.

Description

Technical Field

[0001] This utility model relates to the field of electronic equipment technology, and in particular to a radio frequency circuit and electronic equipment. Background Technology

[0002] With the widespread application of mobile communication and positioning technologies, electronic devices integrating cellular communication modules and GPS demodulators have become mainstream. In integrated environments, interference may occur when cellular communication modules and GPS modules coexist, especially in AGPS (Assisted GPS) operating mode, where signals from the cellular communication frequency band may significantly interfere with the GPS receiving channel, affecting GPS performance.

[0003] To ensure GPS maintains good sensitivity and accuracy in complex multi-frequency environments, it is typically necessary to design radio frequency circuits with anti-interference capabilities to improve overall system performance. However, achieving low loss, high isolation, and flexible switching control within limited space remains a key problem that the industry urgently needs to solve. The above information is provided as background information only to aid in understanding this disclosure and does not constitute an assertion or admission that any of the above content can be used as prior art relative to this disclosure. Utility Model Content

[0004] This invention provides a radio frequency circuit and electronic device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A radio frequency circuit, used in an electronic device supporting AGPS functionality, includes:

[0007] Cellular communication antenna;

[0008] First GPS antenna;

[0009] The second GPS antenna has a higher spatial isolation from the cellular communication antenna compared to the first GPS antenna.

[0010] The radio frequency switching circuit has its input terminal connected to the first GPS antenna and the second GPS antenna, and its output terminal connected to a GPS demodulator.

[0011] The control module, connected to the cellular communication module, is used to control the radio frequency switching circuit to switch the connection status with the first GPS antenna and the second GPS antenna according to the interference status output by the cellular communication module.

[0012] Optionally, the first GPS antenna is connected to the GPS demodulator via a first receiving path; the first receiving path is connected to the first GPS antenna at the first input port of the radio frequency switching circuit and to the GPS demodulator at the first output port of the radio frequency switching circuit.

[0013] The second GPS antenna is connected to the GPS demodulator via a second receiving path. The second receiving path is connected to the second GPS antenna at the second input port of the radio frequency switching circuit and to the GPS demodulator at the first output port of the radio frequency switching circuit.

[0014] Optionally, a first filter is provided in the first receiving path.

[0015] Optionally, the second receiving path includes a first signal branch and a second signal branch, wherein a second filter is provided in the first signal branch and the second signal branch bypasses the second filter;

[0016] When the radio frequency switching circuit is connected to the second GPS antenna, it selectively connects to either the first signal branch or the second signal branch.

[0017] Optionally, the out-of-band rejection capability of the second filter is higher than that of the first filter.

[0018] Optionally, the radio frequency switching circuit is controlled by the control module to connect or disconnect the connection with the first receiving path;

[0019] The second receiving path is in a constant connection state.

[0020] Optionally, the radio frequency switching circuit is controlled by the control module and can selectively connect to either the first receiving path or the second receiving path.

[0021] Optionally, the radio frequency switching circuit is a double-pole single-throw switch.

[0022] Optionally, the first filter is a low-pass filter used to suppress interference signals from cellular communication frequency bands;

[0023] The second filter is a bandpass filter, used to enhance the in-band passband characteristics of GPS signals.

[0024] This invention also provides an electronic device, including the radio frequency circuit described above.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention provides a radio frequency circuit and electronic device, which includes two GPS antennas. The second GPS antenna has higher isolation from the cellular communication antenna. The two GPS antennas and a GPS demodulator are connected via a radio frequency switching circuit, and the switching state is controlled by a control module. This invention dynamically adjusts the antenna path according to the interference status output by the cellular communication module, thereby enhancing the overall anti-interference capability. This is beneficial for providing a more stable GPS reception path in scenarios with cellular interference.

[0027] This invention has other features and advantages that will be apparent from or will be set forth in detail in the accompanying drawings and the following detailed description, which together serve to explain the particular principles of this invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a radio frequency circuit provided in an embodiment of the present invention.

[0030] Reference numerals: 11, High-frequency cellular antenna; 12, Low-frequency cellular antenna; 21, First GPS antenna; 22, Second GPS antenna; 23, GPS demodulator; 24, Radio frequency switching circuit; 31, Control module; 41, Bypass branch; 51, First filter; 52, Second filter. Detailed Implementation

[0031] To illustrate the possible application scenarios, technical principles, implementable specific solutions, and achievable objectives and effects of this application in detail, the following description, in conjunction with the listed specific embodiments and accompanying drawings, provides a detailed explanation. The embodiments described herein are merely illustrative of the technical solutions of this application and are therefore intended to limit the scope of protection of this application.

[0032] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0033] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0034] In the description of this application, the term "and / or" is used to describe the logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and A and B exist simultaneously. Additionally, the character " / " in this document generally indicates that the preceding and following objects have an "or" logical relationship.

[0035] In this application, terms such as “first” and “second” are used only to distinguish one entity or operation from another, and do not necessarily require or imply any actual quantity, hierarchy or order relationship between these entities or operations.

[0036] Unless otherwise specified, the use of terms such as “comprising,” “including,” “having,” or other similar expressions in this application is intended to cover non-exclusive inclusion, which does not exclude the presence of additional elements in a process, method, or product that includes the stated elements, such that a process, method, or product that includes a list of elements may include not only those defined elements but also other elements not expressly listed, or elements inherent to such a process, method, or product.

[0037] Similar to the understanding in the Examination Guidelines, in this application, expressions such as "greater than," "less than," and "exceeding" are understood to exclude the stated number; expressions such as "above," "below," and "within" are understood to include the stated number. Furthermore, in the description of the embodiments in this application, "multiple" means two or more (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups" and "multiple times," unless otherwise explicitly specified.

[0038] In the description of the embodiments of this application, the space-related expressions used, such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or drawings. They are only for the purpose of describing the specific embodiments of this application or for the reader's understanding, and do not indicate or imply that the device or component referred to must have a specific position, a specific orientation, or be constructed or operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0039] Unless otherwise expressly specified or limited, the terms "installation," "connection," "linking," "fixing," and "setting," as used in the description of the embodiments of this application, should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two components or the interaction between two components. For those skilled in the art to which this application pertains, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] In existing electronic devices, the spatial isolation between GPS antennas and cellular antennas cannot be guaranteed. Although adding an extra filter can suppress cellular interference in AGPS scenarios, it will increase signal insertion loss in single GPS scenarios, thus sacrificing single GPS performance.

[0041] To address the aforementioned issues, this invention achieves a balance between dual-mode performance by dynamically switching dual GPS antennas, suppressing AGPS cellular interference while ensuring low signal loss in single-GPS scenarios.

[0042] The following is a detailed description of this embodiment with reference to the accompanying drawings.

[0043] Please refer to Figure 1 This utility model provides a radio frequency (RF) circuit for use in electronic devices that support AGPS functionality. As shown in the figure, this RF circuit, through a reasonable layout, can effectively receive and process GPS signals and other RF signals. With the help of AGPS technology, it assists electronic devices in achieving positioning and other functions more efficiently and accurately, providing users with a more stable user experience.

[0044] Specifically, the radio frequency circuit includes:

[0045] Cellular communication antenna; specifically, the cellular communication antenna includes a mid-to-high frequency cellular antenna 11 and a low-frequency cellular antenna 12;

[0046] First GPS antenna 21;

[0047] The second GPS antenna 22 has a higher spatial isolation from the cellular communication antenna compared to the first GPS antenna 21.

[0048] The radio frequency switching circuit 24 has its input terminal connected to the first GPS antenna 21 and the second GPS antenna 22, and its output terminal connected to the GPS demodulator 23.

[0049] The control module 31 is connected to the cellular communication module and is used to control the radio frequency switching circuit 24 to switch the connection state with the first GPS antenna 21 and the second GPS antenna 22 according to the interference status output by the cellular communication module.

[0050] Specifically, the control module 31 is a CPU Modem (modem chip).

[0051] In this embodiment, by setting two GPS antennas, with the second GPS antenna 22 having higher isolation from the cellular communication antenna, a clearer GPS reception path is provided in scenarios with cellular interference. In this embodiment, the two GPS antennas and the GPS demodulator 23 are connected by an RF switching circuit 24, and its switching state is controlled by a control module 31. The antenna path is dynamically adjusted according to the interference status output by the cellular communication module, thereby enhancing the overall anti-interference capability.

[0052] With the aforementioned settings, when cellular interference is strong, the system switches to the receiving path of the second GPS antenna 22, which has a higher degree of isolation, thereby improving AGPS performance; when interference is weak, the first GPS path can be maintained to reduce path loss and meet the sensitivity requirements in single GPS mode.

[0053] In some embodiments, the first GPS antenna 21 is connected to the GPS demodulator 23 via a first receiving path; the first receiving path is connected to the first GPS antenna 21 at the first input port of the radio frequency switching circuit 24 and to the GPS demodulator 23 at the first output port of the radio frequency switching circuit 24.

[0054] The second GPS antenna 22 is connected to the GPS demodulator 23 through the second receiving path. The second receiving path is connected to the second GPS antenna 22 at the second input port of the RF switching circuit 24 and to the GPS demodulator 23 at the first output port of the RF switching circuit 24.

[0055] The clear division of the aforementioned path structure helps to improve the rationality of radio frequency circuit wiring, thereby further optimizing the stability of signal transmission.

[0056] In some implementations, a first filter 51 is provided in the first receiving path. It is understood that the first filter 51 is used to perform basic signal purification to suppress some out-of-band interference and improve signal purity, especially to optimize the receiving channel in a single GPS mode.

[0057] In some embodiments, the second receiving path includes a first signal branch and a second signal branch, wherein a second filter 52 is provided in the first signal branch, and the second signal branch bypasses the second filter 52. When the RF switching circuit 24 is connected to the second GPS antenna 22, it selectively connects to either the first signal branch or the second signal branch.

[0058] Specifically, the out-of-band rejection capability of the second filter 52 is higher than that of the first filter 51. Because the out-of-band rejection capability of the second filter 52 is higher than that of the first filter 51, it can further enhance its anti-interference capability in the operating mode with severe cellular interference, thereby enhancing the stability of signal transmission.

[0059] Furthermore, the second receiving path includes a bypass structure. The control circuit, based on the interference status output by the cellular communication module, allows the GPS signal to bypass the second filter 52 and directly connect to the GPS demodulator 23 when the isolation condition is met. This configuration improves the flexibility of path selection, allowing for the selection of a suitable path connection scheme in practical applications.

[0060] For example, when cellular interference is severe, the first signal branch with the second filter 52 is selected; if the signal interference is not significant, the second signal branch is selected to bypass the second filter 52 to reduce signal loss, thereby improving the receiving sensitivity.

[0061] In some implementations, the radio frequency switching circuit 24 is controlled by the control module 31 to connect or disconnect the connection with the first receiving path; the second receiving path is in a constant connection state.

[0062] By limiting the RF switching circuit 24 to only connect or disconnect the first receiving path, while the second receiving path remains constantly connected, the control logic is simplified. This ensures the stable existence of the AGPS path while controlling the use of the first path as needed, thus saving resources and improving efficiency.

[0063] In some implementations, the radio frequency switching circuit 24 is controlled by the control module 31 to selectively connect to either the first receiving path or the second receiving path.

[0064] When the RF switching circuit 24 selects one of the two paths to connect, it can improve the acceptance efficiency while reducing costs and improving the adaptability in different interference environments.

[0065] In some implementations, the RF switching circuit 24 is a double-pole single-throw switch. When it is necessary to switch connection paths, the double-pole single-throw switch is used to cut off unnecessary connections of unwanted antenna paths, avoid interference introduced by idle antennas, ensure the signal purity of the working path, and improve the quality of GPS signal reception.

[0066] In some implementations, the first filter 51 is a low-pass filter used to suppress interference signals from the cellular communication frequency band; the second filter 52 is a band-pass filter used to enhance the in-band passband characteristics of the GPS signal. By configuring the first filter 51 and the second filter 52 specifically, it is beneficial to improve the signal processing effect under different frequency bands and achieve differentiated filtering configuration.

[0067] This RF circuit design is based on a multi-antenna switching architecture to achieve anti-interference collaborative operation between GPS and cellular communication.

[0068] When the device only operates the independent GPS positioning function, that is, in single GPS mode, when the control module 31 confirms that there is no frequency band interference, it outputs a low level through the GPIO pin, and the RF switching circuit 24 turns on the RF1 path and connects to the first GPS antenna 21. The first receiving path where the first GPS antenna 21 is located is designed as a low-loss signal link, and its spatial layout is close to the cellular communication antenna. At this time, the efficiency of the first GPS antenna 21 meets the TIS (Total Isotropic Sensitivity) requirement in single GPS mode.

[0069] When the device enables the AGPS assisted positioning function, the control module 31 monitors the interference status of the cellular communication module in real time. If interference in a specific frequency band is detected, the GPIO of the control module 31 outputs a high level, and the RF switching circuit 24 conducts the RF2 path to connect to the second GPS antenna 22. The second GPS antenna 22 adopts a high isolation design and maintains a certain physical distance from the cellular communication antenna. The signal link integrates a second filter 52, which improves the anti-interference performance in AGPS mode and meets the corresponding TIS requirements.

[0070] In summary, the control module 31 implements intelligent switching based on a specific strategy. It first pre-configures a frequency band interference database of interference characteristics for each cellular frequency band, then determines the interference intensity through the RSSI value of the cellular communication module, and follows the adaptive switching logic.

[0071] Specifically, if the RSSI value of cellular communication is greater than the preset interference threshold, the level of the general GPIO pin is set to 1, and the second GPS antenna 22 is switched; otherwise, the level of the GPIO pin is set to 0, that is, the first GPS antenna 21 is used.

[0072] Meanwhile, when the spatial isolation of the second GPS antenna 22 meets the requirements, the second filter 52 can be bypassed through the bypass branch 41 to reduce signal insertion loss.

[0073] Based on the foregoing embodiments, this utility model also provides an electronic device, including the radio frequency circuit described above.

[0074] By integrating this radio frequency circuit into electronic devices, it can be adapted to integrated products such as smartphones, achieving high-quality communication in limited spaces.

[0075] Finally, it should be noted that although the above embodiments have been described in the text and drawings of this application, this should not limit the scope of protection of this utility model. Any technical solutions resulting from equivalent structural or procedural substitutions or modifications made based on the essential concept of this application and utilizing the content described in the text and drawings of this application, as well as the direct or indirect application of the technical solutions of the above embodiments to other related technical fields, are all included within the scope of protection of this utility model.

Claims

1. A radio frequency circuit applied in an electronic device supporting AGPS function, characterized in that, include: Cellular communication antenna; First GPS antenna; The second GPS antenna has a higher spatial isolation from the cellular communication antenna compared to the first GPS antenna. The radio frequency switching circuit has its input terminal connected to the first GPS antenna and the second GPS antenna, and its output terminal connected to a GPS demodulator. The control module, connected to the cellular communication module, is used to control the radio frequency switching circuit to switch the connection status with the first GPS antenna and the second GPS antenna according to the interference status output by the cellular communication module.

2. The radio frequency circuit according to claim 1, characterized in that, The first GPS antenna is connected to the GPS demodulator via a first receiving path; the first receiving path is connected to the first GPS antenna at the first input port of the radio frequency switching circuit and to the GPS demodulator at the first output port of the radio frequency switching circuit. The second GPS antenna is connected to the GPS demodulator via a second receiving path. The second receiving path is connected to the second GPS antenna at the second input port of the radio frequency switching circuit and to the GPS demodulator at the first output port of the radio frequency switching circuit.

3. The radio frequency circuit according to claim 2, characterized in that, The first receiving path is equipped with a first filter.

4. The radio frequency circuit according to claim 3, characterized in that, The second receiving path includes a first signal branch and a second signal branch. A second filter is provided in the first signal branch, and the second signal branch bypasses the second filter. When the radio frequency switching circuit is connected to the second GPS antenna, it selectively connects to either the first signal branch or the second signal branch.

5. The radio frequency circuit according to claim 4, characterized in that, The second filter has a higher out-of-band rejection capability than the first filter.

6. The radio frequency circuit according to any one of claims 2-5, characterized in that, The radio frequency switching circuit is controlled by the control module to connect or disconnect the connection with the first receiving path; The second receiving path is in a constant connection state.

7. The radio frequency circuit according to any one of claims 2-5, characterized in that, The radio frequency switching circuit is controlled by the control module and can selectively connect to either the first receiving path or the second receiving path.

8. The radio frequency circuit according to any one of claims 1-5, characterized in that, The radio frequency switching circuit is a double-pole single-throw switch.

9. The radio frequency circuit according to claim 4 or 5, characterized in that, The first filter is a low-pass filter used to suppress interference signals from the cellular communication frequency band; The second filter is a bandpass filter, used to enhance the in-band passband characteristics of GPS signals.

10. An electronic device, characterized in that, Includes the radio frequency circuit as described in any one of claims 1 to 9.

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