Anti-interference circuits for wearable devices and wearable electronic devices

Abstract

This utility model discloses an anti-interference circuit for wearable devices, comprising: a Bluetooth module and / or a WIFI module, and a GNSS module; the GNSS module includes a first filtering circuit, which includes a first inductor, a second inductor, a third inductor, and a first capacitor. The first inductor and the second inductor are connected in series. One end of the first capacitor is electrically connected to the connection line between the first inductor and the second inductor, and the other end of the first capacitor is electrically connected to one end of the third inductor. The other end of the third inductor is grounded. The first filtering circuit is used to filter the radio frequency signals generated by the antennas of the Bluetooth module and / or the WIFI module to avoid interfering with the positioning signals in the GNSS module.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuits, specifically to an anti-interference circuit for wearable devices and a wearable electronic device. Background Technology

[0002] Existing wearable devices possess GNSS positioning, Bluetooth, and wireless communication capabilities. The simultaneous operation of these different wireless communication functions can lead to electromagnetic interference. Due to the compact structure of wearable devices, mutual interference can exist between wireless signals within the device, resulting in performance degradation. For example, anti-interference processing of GNSS signals is a crucial component of positioning equipment; the quality of anti-interference performance directly affects the effectiveness of subsequent signal positioning and tracking. Poor anti-interference performance may lead to positioning failure or excessively high positioning accuracy.

[0003] Currently, conventional technologies increase the physical distance between the interference source and the interfered source, and use shielding measures such as shielding covers, conductive cloths, or absorbing materials. Radio frequency circuits also use surface acoustic wave (SAW) filters. However, these methods suffer from high costs and large space requirements. Summary of the Invention

[0004] Based on the above situation, the main purpose of this utility model is to provide a wearable device anti-interference circuit that is low in cost, small in space, and has strong anti-interference performance.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An anti-interference circuit for a wearable device, comprising:

[0007] Bluetooth module and / or WIFI module;

[0008] GNSS module;

[0009] The GNSS module includes a first filtering circuit, which includes a first inductor, a second inductor, a third inductor, and a first capacitor. The first inductor and the second inductor are connected in series. One end of the first capacitor is electrically connected to the connection line between the first inductor and the second inductor, and the other end of the first capacitor is electrically connected to one end of the third inductor. The other end of the third inductor is grounded. The first filtering circuit is used to filter the radio frequency signals generated by the antennas of the Bluetooth module and / or the WIFI module to avoid interference with the positioning signals in the GNSS module.

[0010] Preferably, the Bluetooth module includes a Bluetooth antenna, a Bluetooth antenna matching unit, a filtering circuit, and a Bluetooth processing chip.

[0011] The Bluetooth processing chip is electrically connected to one end of the filtering circuit;

[0012] The other end of the filter circuit is electrically connected to one end of the Bluetooth antenna matching unit;

[0013] The other end of the Bluetooth antenna matcher is electrically connected to the Bluetooth antenna.

[0014] Preferably, the WIFI module includes a WIFI antenna, a WIFI antenna matching unit, a filtering circuit, and a WIFI processing chip.

[0015] The WIFI processing chip is electrically connected to one end of the filtering circuit;

[0016] The other end of the filter circuit is electrically connected to one end of the WIFI antenna matching unit;

[0017] The other end of the WIFI antenna matcher is electrically connected to the WIFI antenna.

[0018] Preferably, the filtering circuit is a surface acoustic wave filter.

[0019] Preferably, the GNSS module further includes a GNSS antenna, a GNSS antenna matching circuit, a low-noise amplifier, and a GNSS processing chip.

[0020] The GNSS processing chip is electrically connected to one end of the low-noise amplifier.

[0021] The other end of the low-noise amplifier is electrically connected to the second inductor in the first filter circuit, and the first inductor in the first filter circuit is electrically connected to one end of the GNSS antenna matching circuit.

[0022] The other end of the GNSS antenna matching circuit is electrically connected to the GNSS antenna.

[0023] Preferably, the GNSS module further includes a surface acoustic wave (SAW) filter, one end of which is electrically connected to the GNSS processing chip, and the other end of which is electrically connected to the low-noise amplifier.

[0024] Preferably, the GNSS module further includes a second filtering circuit, which includes a fourth inductor, a fifth inductor, a sixth inductor, and a second capacitor.

[0025] The fourth inductor is connected in series with the fifth inductor. One end of the fourth inductor is electrically connected to the low-noise amplifier, and one end of the fifth inductor is electrically connected to the GNSS processing chip. One end of the second capacitor is electrically connected to the connection line between the fourth and fifth inductors, and the other end of the second capacitor is electrically connected to one end of the sixth inductor. The other end of the sixth inductor is grounded. The second filter circuit is used to filter the radio frequency signals generated by the antennas of the Bluetooth module and the WIFI module to avoid interference with the positioning signal in the GNSS module.

[0026] Preferably, the inductance value of the first inductor is 2.2nH, the inductance value of the second inductor is 2.2nH, the inductance value of the third inductor is 3.6nH, and the capacitance value of the first capacitor is 1pF.

[0027] This utility model also discloses a wearable electronic device, including the anti-interference circuit described in any one of this utility model.

[0028] In this invention, a filter circuit is formed by setting four discrete components in the GNSS circuit module, which can effectively suppress the impact of Bluetooth / WIFI radio frequency spurious interference signals on GNSS signal performance. This effectively reduces the problems of high cost and large space occupation of radio frequency anti-interference circuits in wearable devices.

[0029] Other beneficial effects of this utility model will be explained in the specific embodiments through the introduction of specific technical features and technical solutions. Those skilled in the art should be able to understand the beneficial technical effects brought about by these technical features and technical solutions through the introduction of these technical features and technical solutions. Attached Figure Description

[0030] The preferred embodiment of the anti-interference circuit for wearable devices according to the present invention will be described below with reference to the accompanying drawings. In the drawings:

[0031] Figure 1 This is a block diagram of an anti-interference circuit for a wearable device according to a preferred embodiment of the present invention.

[0032] Figure 2 The circuit diagram is shown below for the first filter circuit in the anti-interference circuit of a wearable device according to a preferred embodiment of the present invention.

[0033] Figure 3 This is a circuit block diagram of a Bluetooth module according to a preferred embodiment of the present invention;

[0034] Figure 4 This is a circuit block diagram of a WIFI module according to a preferred embodiment of the present invention;

[0035] Figure 5 This is a circuit block diagram of a Bluetooth / WIFI module according to a preferred embodiment of the present invention;

[0036] Figure 6 This is a circuit block diagram of a GNSS module according to a preferred embodiment of the present invention;

[0037] Figure 7 This is a block diagram of an anti-interference circuit for a Bluetooth / WIFI module and a GNSS module according to a preferred embodiment of the present invention.

[0038] Figure 8 This is a circuit block diagram of a GNSS module according to another preferred embodiment of the present invention;

[0039] Figure 9 This is a graph showing the relationship between different operating frequency signals and insertion loss values, tested according to the technical solution of this utility model. Detailed Implementation

[0040] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this utility model.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. In this application, "first," "second," "third," "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] Figure 1 The block diagram of an anti-interference circuit for a wearable device according to a preferred embodiment of the present invention includes a Bluetooth module and / or a WIFI module 100 and a GNSS module 200. The GNSS module 100 includes a first filter circuit 201, such as... Figure 2As shown, the first filtering circuit includes a first inductor L1, a second inductor L2, a third inductor L3, and a first capacitor C1. The first inductor L1 and the second inductor L2 are connected in series. One end of the first capacitor C1 is electrically connected to the connection line between the first inductor L1 and the second inductor L2, and the other end of the first capacitor C1 is electrically connected to one end of the third inductor L3. The other end of the third inductor L3 is grounded. The first filtering circuit is used to filter the radio frequency signals generated by the antenna of the Bluetooth module and / or the WIFI module 100 to avoid interference with the positioning signals in the GNSS module 100.

[0043] In this invention, a filter circuit is formed by setting four discrete components in the GNSS circuit module, which can effectively suppress the impact of Bluetooth / WIFI radio frequency spurious interference signals on GNSS signal performance. This effectively reduces the problems of high cost and large space occupation of radio frequency anti-interference circuits in wearable devices.

[0044] In specific implementations, wearable devices may include independent Bluetooth modules, independent WIFI modules, or integrated Bluetooth and WIFI modules, all of which can adopt the anti-interference measures described in this technical solution.

[0045] In a preferred embodiment, such as Figure 3 As shown, the Bluetooth module 100 may include a Bluetooth antenna 101, a Bluetooth antenna matching unit 102, a filtering circuit 103, and a Bluetooth processing chip 104. The Bluetooth processing chip 104 is electrically connected to one end of the filtering circuit 103, the other end of the filtering circuit 103 is electrically connected to one end of the Bluetooth antenna matching unit 102, and the other end of the Bluetooth antenna matching unit 102 is electrically connected to the Bluetooth antenna 101. Figure 4 As shown, the WIFI module 100 may include a WIFI antenna 101, a WIFI antenna matching unit 102, a filter circuit 103, and a WIFI processing chip. The WIFI processing chip 104 is electrically connected to one end of the filter circuit 103, the other end of the filter circuit 103 is electrically connected to one end of the WIFI antenna matching unit 102, and the other end of the WIFI antenna matching unit 102 is electrically connected to the WIFI antenna. Another implementation is a Bluetooth and WIFI integrated module, such as... Figure 5 As shown, the Bluetooth and WIFI integrated module 100 may include a Bluetooth / WIFI antenna 101, a Bluetooth / WIFI antenna matching unit 102, a filtering circuit 103, and a Bluetooth / WIFI processing chip 104. The Bluetooth / WIFI processing chip 104 is electrically connected to one end of the filtering circuit 103, the other end of the filtering circuit 103 is electrically connected to one end of the Bluetooth / WIFI antenna matching unit 102, and the other end of the Bluetooth / WIFI antenna matching unit 102 is electrically connected to the Bluetooth / WIFI antenna 101.

[0046] In a specific implementation, the above Figure 2-5 The filtering circuit in the embodiment can be a surface acoustic wave filter.

[0047] In a preferred embodiment, such as Figure 6 As shown, the GNSS module 200 may further include a GNSS antenna 202, a GNSS antenna matching circuit 203, a low-noise amplifier 204, and a GNSS processing chip 205. The GNSS processing chip 205 is electrically connected to one end of the low-noise amplifier 204, and the other end of the low-noise amplifier 204 is electrically connected to the second inductor L2 in the first filter circuit 201. The first inductor L1 in the first filter circuit 201 is electrically connected to one end of the GNSS antenna matching circuit 203, and the other end of the GNSS antenna matching circuit 203 is electrically connected to the GNSS antenna 202.

[0048] like Figure 7 As shown, in wearable devices, the radio frequency signal of the Bluetooth / WIFI module can interfere with the radio frequency signal of the GNSS module. The anti-interference circuit of this invention can effectively suppress the impact of Bluetooth / WIFI radio frequency spurious interference signals on the performance of GNSS signals, and is less expensive than existing solutions.

[0049] In a preferred embodiment, the GNSS module 200 may further include a surface acoustic wave filter, one end of which is electrically connected to the GNSS processing chip 205 and the other end of which is electrically connected to the low noise amplifier 204.

[0050] In a preferred embodiment, such as Figure 8 As shown, the GNSS module 200 may further include a second filtering circuit 206. The second filtering circuit 206 includes a fourth inductor L4, a fifth inductor L5, a sixth inductor L6, and a second capacitor C2. The fourth inductor L4 and the fifth inductor L5 are connected in series. One end of the fourth inductor L4 is electrically connected to the low-noise amplifier 204, and one end of the fifth inductor L5 is electrically connected to the GNSS processing chip 205. One end of the second capacitor C2 is electrically connected to the connection line between the fourth inductor L4 and the fifth inductor L5, and the other end of the second capacitor C2 is electrically connected to one end of the sixth inductor L6. The other end of the sixth inductor L6 is grounded. The second filtering circuit 206 can also filter the radio frequency signals generated by the antennas of the Bluetooth module and the WIFI module to avoid interference with the positioning signal in the GNSS module. Adding a second filtering circuit between the GNSS processing chip 205 and the low-noise amplifier 205 further filters the filtered GNSS radio frequency signal, resulting in a cleaner GNSS signal and improved positioning accuracy.

[0051] In a preferred embodiment, the inductance value of the first inductor L1 can be 2.2nH, the inductance value of the second inductor L2 can be 2.2nH, the inductance value of the third inductor L3 can be 3.6nH, and the capacitance value of the first capacitor C1 can be 1pF. This can effectively suppress the impact of Bluetooth / WIFI radio frequency spurious interference signals on GNSS signal performance while ensuring that the insertion loss in the GNSS frequency band of 1550-1610MHz is minimized.

[0052] Similarly, the inductance value of the fourth inductor L4 in the second filter circuit 206 can also be 2.2nH, the inductance value of the fifth inductor L5 can also be 2.2nH, the inductance value of the sixth inductor L6 can also be 3.6nH, and the capacitance value of the second capacitor C2 can also be 1pF.

[0053] like Figure 9 The figure shows the relationship between the signal operating frequency and the insertion loss value tested using the technical solution of this utility model. The horizontal axis represents the signal operating frequency in GHz, ranging from 0.4 GHz to 3 GHz. The vertical axis represents the insertion loss (IL), which is the difference between the output power and the input power after the signal passes through the filter circuit. The larger the insertion loss value, the more severely the signal attenuates at that frequency. The curves in the figure show the relationship between the insertion loss of the first filter circuit at different frequencies. In the figure, point m1 corresponds to a signal frequency of 1.575 GHz with an insertion loss of 0.258 dB; point m2 corresponds to a signal frequency of 1.61 GHz with an insertion loss of 0.257 dB; point m3 corresponds to a signal frequency of 2.4 GHz with an insertion loss of 21.576 dB; point m4 corresponds to a frequency of 2.5 GHz with an insertion loss of 21.223 dB; and point m5 corresponds to a signal frequency of 2.45 GHz with an insertion loss of 25.725 dB. As can be seen, the anti-interference circuit of this invention has very small insertion loss in the GNSS frequency band of 1550-1610MHz, while it produces significant attenuation outside the 1550-1610MHz frequency band, i.e., "filtering effect", thus achieving an effective filtering effect.

[0054] This utility model also discloses a wearable electronic device, including the anti-interference circuit described in any one of this utility model.

[0055] Those skilled in the art will understand that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0056] It should be understood that the above-described embodiments are merely exemplary and not restrictive. Without departing from the basic principles of this utility model, any obvious or equivalent modifications or substitutions made by those skilled in the art regarding the above details will be included within the scope of the claims of this utility model.

Claims

1. An anti-interference circuit for wearable devices, characterized in that, include: Bluetooth module and / or WIFI module; GNSS module; The GNSS module includes a first filtering circuit, which includes a first inductor, a second inductor, a third inductor, and a first capacitor. The first inductor and the second inductor are connected in series. One end of the first capacitor is electrically connected to the connection line between the first inductor and the second inductor, and the other end of the first capacitor is electrically connected to one end of the third inductor. The other end of the third inductor is grounded. The first filtering circuit is used to filter the radio frequency signals generated by the antennas of the Bluetooth module and / or the WIFI module to avoid interference with the positioning signals in the GNSS module.

2. The wearable device anti-interference circuit according to claim 1, characterized in that, The Bluetooth module includes a Bluetooth antenna, a Bluetooth antenna matching unit, a filtering circuit, and a Bluetooth processing chip. The Bluetooth processing chip is electrically connected to one end of the filtering circuit; The other end of the filter circuit is electrically connected to one end of the Bluetooth antenna matching unit; The other end of the Bluetooth antenna matcher is electrically connected to the Bluetooth antenna.

3. The wearable device anti-interference circuit according to claim 1, characterized in that, The WIFI module includes a WIFI antenna, a WIFI antenna matching unit, a filtering circuit, and a WIFI processing chip. The WIFI processing chip is electrically connected to one end of the filtering circuit; The other end of the filter circuit is electrically connected to one end of the WIFI antenna matching unit; The other end of the WIFI antenna matcher is electrically connected to the WIFI antenna.

4. The wearable device anti-interference circuit of any one of claims 2-3, wherein, The filtering circuit is a surface acoustic wave filter.

5. The wearable device anti-interference circuit of claim 1, wherein, The GNSS module also includes a GNSS antenna, a GNSS antenna matching circuit, a low-noise amplifier, and a GNSS processing chip. The GNSS processing chip is electrically connected to one end of the low-noise amplifier. The other end of the low-noise amplifier is electrically connected to the second inductor in the first filter circuit, and the first inductor in the first filter circuit is electrically connected to one end of the GNSS antenna matching circuit. The other end of the GNSS antenna matching circuit is electrically connected to the GNSS antenna.

6. The wearable device anti-interference circuit of claim 5, wherein, The GNSS module also includes a surface acoustic wave (SAW) filter, one end of which is electrically connected to the GNSS processing chip, and the other end of which is electrically connected to the low-noise amplifier.

7. The wearable device anti-interference circuit of claim 5, wherein, The GNSS module further includes a second filtering circuit, which comprises a fourth inductor, a fifth inductor, a sixth inductor, and a second capacitor. The fourth inductor is connected in series with the fifth inductor. One end of the fourth inductor is electrically connected to the low-noise amplifier, and one end of the fifth inductor is electrically connected to the GNSS processing chip. One end of the second capacitor is electrically connected to the connection line between the fourth and fifth inductors, and the other end of the second capacitor is electrically connected to one end of the sixth inductor. The other end of the sixth inductor is grounded. The second filter circuit is used to filter the radio frequency signals generated by the antennas of the Bluetooth module and the WIFI module to avoid interference with the positioning signal in the GNSS module.

8. The wearable device anti-interference circuit of claim 1, wherein, The inductance of the first inductor is 2.2nH, the inductance of the second inductor is 2.2nH, the inductance of the third inductor is 3.6nH, and the capacitance of the first capacitor is 1pF.

9. A wearable electronic device, characterized in that, Including the anti-interference circuit as described in any one of claims 1-8.

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