Signal processing circuit and electronic device

Abstract

The application discloses a signal processing circuit and electronic equipment, and belongs to the technical field of data transmission. The signal processing circuit comprises a controller, a first switch module, a second switch module and a USB interface; the first end of the controller is connected with the control end of the first switch module, the second end of the controller is connected with the first end of the first switch module, the second end of the first switch module is connected with the USB interface through the second switch module, and the third end of the first switch module is connected with the USB interface; when it is acquired that the to-be-transmitted signal comprises a first USB data signal, the controller controls the first end of the first switch module and the third end of the first switch module to be conductive, and the first USB data signal is a USB data signal in a low-insertion-loss USB data transmission scene; otherwise, the controller controls the first end of the first switch module and the second end of the first switch module to be conductive; and the second switch module is used for conducting a data channel matched with the to-be-transmitted signal.

Description

Technical Field

[0001] This application belongs to the field of data transmission technology, specifically relating to a signal processing circuit and an electronic device. Background Technology

[0002] Mobile phones and other electronic devices can be connected to the vehicle's infotainment system via a USB cable to exchange signals between the phone and the system.

[0003] In related technologies, the system framework for transmitting USB data inside a mobile phone Figure 1 As shown, the Application Processor (AP) controls the USB switch to switch between the USB path and the Mobile High-Definition Link (MHL) path via an enable signal. Then, it controls the Type-C switch to switch between USB mode, audio mode, and DisplayPort (DP) projection mode via communication methods such as the Inter-Integrated Circuit (IIC). The internal switching between the USB and Type-C switches determines which type of data is ultimately transmitted. These two switches can cause insertion loss during USB data transmission, thus reducing the performance of USB data exchange between the mobile phone and the vehicle's infotainment system. Summary of the Invention

[0004] The purpose of this application is to provide a signal processing circuit and electronic device that connects the AP to the Type-C connector by adding a bypass, thereby solving the problem of interference caused by the USB switch and the Type-C switch on the USB data transmitted between the AP and the Type-C connector.

[0005] In a first aspect, embodiments of this application provide a signal processing circuit, including: a controller, a first switch module, a second switch module, and a USB interface;

[0006] The first end of the controller is connected to the control end of the first switch module, the second end of the controller is connected to the first end of the first switch module, the second end of the first switch module is connected to the USB interface through the second switch module, and the third end of the first switch module is connected to the USB interface.

[0007] Wherein, when the controller obtains that the signal to be transmitted includes the first USB data signal, it controls the first terminal of the first switch module to be connected to the third terminal of the first switch module, wherein the first USB data signal is the USB data signal under the low insertion loss USB data transmission scenario; when the controller obtains that the signal to be transmitted does not include the first USB data signal, it controls the first terminal of the first switch module to be connected to the second terminal of the first switch module.

[0008] The second switch module is used to activate a data path that matches the signal to be transmitted.

[0009] Secondly, embodiments of this application provide an electronic device including the signal processing circuit described in the first aspect.

[0010] In this embodiment, when the controller receives a signal to be transmitted including a first USB data signal, it controls the first terminal of the first switch module to be connected to the third terminal of the first switch module, so as to transmit the first USB data signal to the USB interface through the third terminal of the first switch module, or transmit the first USB data signal from the USB interface to the controller through the first terminal of the first switch module. The first USB data signal is a USB data signal under low insertion loss USB data transmission scenario. In this way, the first USB data signal does not need to be transmitted through the second switch module and the corresponding data path, thereby avoiding the insertion loss caused by the second switch module and its data path to the first USB data signal, and thus improving the USB data interaction performance between the electronic device where the signal processing circuit provided in this embodiment is located and the device connected to the USB interface. Attached Figure Description

[0011] Figure 1 This is a block diagram of a USB data transfer system in related technologies;

[0012] Figure 2 This is a structural block diagram of a signal processing circuit provided in an embodiment of this application;

[0013] Figure 3 This is a schematic diagram of the working process of a signal processing circuit provided in an embodiment of this application;

[0014] Figure 4a This is one of the circuit structure diagrams of a signal processing circuit provided in the embodiments of this application;

[0015] Figure 4b This is a second schematic diagram of the circuit structure of a signal processing circuit provided in an embodiment of this application;

[0016] Figure 4cThis is the third schematic diagram of the circuit structure of a signal processing circuit provided in the embodiments of this application;

[0017] Figure 5 This is a schematic diagram showing the connection relationship between the radio frequency coaxial cable, modulator, and demodulator in a signal processing circuit provided in an embodiment of this application;

[0018] Figure 6 This is a schematic diagram of the structure of a radio frequency coaxial cable connecting the motherboard and the sub-board in an electronic device provided in this application embodiment. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0020] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0021] In related technologies, cars and mobile phones can be interconnected to realize vehicle networking functions; based on the mobile phone, the car can bring the same experience as the mobile phone, such as navigation, music control, weather preview, voice control, etc.

[0022] Currently, there are two ways to connect a car and a mobile phone: one is a wired connection based on a USB cable; the other is a wireless connection through hotspots, wireless local area networks (WLAN), ultra-wideband (UWB), etc. Relatively few car models currently support wireless connections, but all existing models support wired connections.

[0023] For wired connections, the signal quality transmitted via USB cable depends primarily on the design and selection of the mobile phone, USB cable, and vehicle infotainment system modules.

[0024] 1) For mobile phones, given the relatively stable performance of their USB-related functions, the impact on USB signal transmission is minimal;

[0025] 2) Regarding USB cables, given that there are various types of USB cables on the market, with varying lengths and significant performance differences, they have a large impact on USB signal transmission.

[0026] 3) For in-vehicle infotainment systems, due to limitations in the layout of the main control board, the distance between the main control board and the USB socket is relatively far. In this case, a USB extension cable will be added inside the infotainment system to connect the main control board and the USB socket. This USB extension cable has a significant impact on the USB signal transmission.

[0027] In addition, the aforementioned USB cables or USB extension cables may introduce the following two types of problems:

[0028] 1) Initially, wired vehicle-to-everything (V2X) connections could not be established. For example, the insertion loss of USB transmission signals is relatively large when using USB cables or USB extension cables, making it impossible to accurately identify USB transmission signals, thus preventing wired V2X connections from establishing a connection initially.

[0029] 2) Initially, the wired vehicle network could connect, but it suddenly stopped during use; for example, when the user touches the USB cable or the car passes through a shaking road, the transmitted signal jitters. Combined with the large insertion loss of the USB cable or USB extension cable, this can cause the USB transmission signal to suddenly stop.

[0030] Specifically, signal communication in wired connection mode is based on protocols such as USB 2.0 (USB 3.2) for transmission;

[0031] In the USB 2.0 protocol, to prevent interference signals from affecting normal signal transmission, two parameters are designed: Squelch and HS_disconnect. When the signal amplitude received by the phone or car is less than the threshold set by Squelch, the received signal is judged as interference and not decoded. This can cause signal disconnection issues when using wired car networking functions, affecting the user experience. Similarly, when the phone receives a signal amplitude greater than HS_disconnect, it is judged as a disconnected communication mode, which can also cause signal disconnection issues when using wired car networking functions, affecting the user experience. For example, a sudden signal interruption while using a wired car networking navigation system on the highway may cause the user to miss a key intersection, or the music may suddenly stop while the user is listening to music in the car, thus impacting the user experience.

[0032] It is worth mentioning that, such as Figure 1As shown in the diagram, in a traditional USB system connection, the USB data output from the AP needs to pass through multiple selection switches (such as USB switch and Type-C switch) before reaching the USB interface (such as USB socket). The insertion loss caused by these switches degrades the signal quality of the entire device's output. In scenarios such as vehicle-mounted system connections, coupled with the varying lengths of the end-to-end USB data cables and the complex data transmission environment, signal interruption is highly likely.

[0033] In this embodiment, by setting a low insertion loss bypass for the selection switch, the USB data signal can be transmitted to the USB interface through the bypass. In this way, the USB data signal does not need to be transmitted through the selection switch, thereby avoiding the insertion loss caused by the selection switch to the USB data signal. This improves the signal quality of USB data transmitted between the electronic device where the signal processing circuit provided in this embodiment is located and the device connected to the USB interface, and also improves the connection stability between the two devices.

[0034] The signal processing circuit and electronic equipment provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0035] Please see Figure 2 The signal processing circuit provided in this application embodiment includes: a controller 1, a first switch module 2, a second switch module 3, and a USB interface 4.

[0036] The controller 1 has a first terminal connected to the control terminal of the first switch module 2, a second terminal connected to the first terminal of the first switch module 2, a second terminal connected to the USB interface 4 via the second switch module 3, and a third terminal connected to the USB interface 4. The second switch module 3 is used to conduct a data path that matches the signal to be transmitted.

[0037] In operation, when the controller 1 obtains that the signal to be transmitted includes the first USB data signal, it controls the first terminal of the first switch module 2 to be connected to the third terminal of the first switch module 2. The first USB data signal is the USB data signal under the low insertion loss USB data transmission scenario. When the controller 1 obtains that the signal to be transmitted does not include the first USB data signal, it controls the first terminal of the first switch module 2 to be connected to the second terminal of the first switch module 2.

[0038] It should be noted that at any given time, the first terminal of the first switch module 2 is only connected to one of the second and third terminals of the first switch module 2. That is, when the first terminal of the first switch module 2 is connected to the second terminal of the first switch module 2, the first terminal of the first switch module 2 is disconnected from the third terminal of the first switch module 2; when the first terminal of the first switch module 2 is connected to the third terminal of the first switch module 2, the first terminal of the first switch module 2 is disconnected from the second terminal of the first switch module 2.

[0039] In one implementation, controller 1 may be an application processor (AP).

[0040] Of course, controller 1 can be an additional controller. In this embodiment, for ease of explanation, it is usually illustrated by controlling it as an AP, which does not constitute a specific limitation.

[0041] In one embodiment, the second switch module 3 causes greater insertion loss to the signal, meaning the insertion loss caused by the second switch module 3 is greater than that caused by the first switch module 2. For example, the second switch module 3 may include at least one of a USB switch and a Type-C switch.

[0042] At this time, the second switch module 3 is used to activate the data path that matches the signal to be transmitted, which can be understood as:

[0043] The USB switch can internally switch between USB and MHL channels;

[0044] The Type-C switch can switch between USB mode, audio mode, and DP projection mode. In audio mode and DP mode, it is compatible with reversible plug path switching. The Type-C switch is also used for data cable identification, making it a multi-functional compatible device.

[0045] In other words, the type of data ultimately transmitted is determined by switching between the USB switch and the Type-C switch. In practice, the AP can control the USB switch and the Type-C switch through the enable signal to switch the type of data ultimately transmitted.

[0046] In one embodiment, data in audio mode and DP projection mode can be transmitted to USB interface 4 via the second switch module 3.

[0047] In other words, when the controller 1 obtains data (such as audio data or video data) in the signal to be transmitted, including audio mode and DP projection mode, the controller 1 can control the first terminal of the first switch module 2 to conduct with the second terminal of the first switch module 2.

[0048] In one embodiment, the data to be transmitted may include data transmitted from the electronic device containing the signal processing circuitry to the external device connected to the USB interface 4.

[0049] In another implementation, the data to be transmitted may include data transmitted from an external device connected to the USB interface 4 to the electronic device where the signal processing circuit is located.

[0050] In another embodiment, the data to be transmitted may include data transmitted from the electronic device containing the signal processing circuit to the external device connected to the USB interface 4, and data transmitted from the external device connected to the USB interface 4 to the electronic device containing the signal processing circuit.

[0051] For ease of explanation, in the embodiments of this application, the example is usually taken as data to be transmitted from the electronic device where the signal processing circuit is located to the external device connected to the USB interface 4, which does not constitute a specific limitation.

[0052] In one embodiment, the first USB data signal may include all USB data signals. In this case, when the controller 1 receives a USB data signal as the signal to be transmitted, it controls the first terminal of the first switch module 2 to be connected to the third terminal of the first switch module 2; when the controller 1 receives a non-USB data signal as the signal to be transmitted, such as an audio signal, it controls the first terminal of the first switch module 2 to be connected to the second terminal of the first switch module 2.

[0053] In another embodiment, the first USB data signal may include a portion of the USB data signal. For example, the first USB data signal is a USB data signal under a low insertion loss transmission scenario, that is, USB data that needs to be transmitted with low insertion loss. In this case, when the controller 1 acquires the USB data, it determines whether the USB data needs to be transmitted with low insertion loss. If it does, it controls the first terminal of the first switch module 2 to be connected to the third terminal of the first switch module 2. If it does not need to be connected or the controller 1 acquires audio data or audio signal, the controller 1 controls the first terminal of the first switch module 2 to be connected to the second terminal of the first switch module 2.

[0054] In general, the insertion loss of the first data path is greater than that of the second data path. The first data path is the data path between the controller 1 and the USB interface 4 when the first terminal of the first switch module 2 is connected to the second terminal of the first switch module 2. The second data path is the data path between the controller 1 and the USB interface 4 when the first terminal of the first switch module 2 is connected to the third terminal of the first switch module 2.

[0055] like Figure 3 As shown, the working process of the signal processing circuit provided in this application embodiment may include the following steps:

[0056] Step 301: Insertion detected data cable connection;

[0057] Step 302: The AP determines whether to perform low-insertion USB data transmission;

[0058] If the judgment result of step 302 is "yes", that is, the data to be transmitted obtained by the AP includes the first USB data, then step 303 is executed; if the judgment result of step 302 is "no", that is, the data to be transmitted obtained by the AP does not include the first USB data, then step 304 is executed.

[0059] Step 303: AP outputs a first signal, which is used to control the first switch module to turn on the second data path;

[0060] Step 304: AP outputs a second signal, the first signal being used to control the first switch module to conduct the first data path.

[0061] As an optional implementation, when the controller 1 receives the signal to be transmitted, including the first USB data signal, it transmits a first electrical signal to the control terminal of the first switch module 2. Under the action of the first electrical signal, the first terminal of the first switch module 2 is connected to the third terminal of the first switch module 2; or,

[0062] When the controller 1 receives a signal to be transmitted that does not include the first USB data signal, it transmits a second electrical signal to the control terminal of the first switch module 2. Under the action of the second electrical signal, the first terminal of the first switch module 2 is connected to the second terminal of the first switch module 2.

[0063] The first and second electrical signals mentioned above can be analog signals with different values ​​or different digital signals, and no specific limitation is made here.

[0064] Optionally, such as Figure 4a As shown, the first switching module 2 includes: a first MOS transistor 21 and a second MOS transistor 22, wherein MOS transistor is short for Metal Oxide Semiconductor.

[0065] The control terminal of the first switching module 2 includes the gate of the first MOS transistor 21 and the gate of the second MOS transistor 22;

[0066] The first terminal of the first switching module 2 includes the source of the first MOS transistor 21 and the source of the second MOS transistor 22;

[0067] The second terminal of the first switching module 2 includes the drain of the second MOS transistor 22;

[0068] The third terminal of the first switching module 2 includes the drain of the first MOS transistor 21;

[0069] When the controller 1 receives the signal to be transmitted, including the first USB data signal, it transmits a first electrical signal to the gate of the first MOSFET 21 and the gate of the second MOSFET 22. The first MOSFET 21 is turned on under the action of the first electrical signal, and the second MOSFET 22 is not turned on.

[0070] In one embodiment, the first MOS transistor can be an NMOS transistor, and the second MOS transistor can be a PMOS transistor. In this case, the first electrical signal can be a high-level signal.

[0071] In other words, when controller 1 receives the signal to be transmitted, including the first USB data signal, it outputs a high-level signal through its first terminal to turn on the NMOS transistor and turn off the PMOS transistor. At this time, the first USB data signal bypasses the high insertion loss device in the second switching module 3 for transmission.

[0072] It should be noted that in the embodiments of this application, the MOS transistor being turned on means that the source and drain of the MOS transistor are connected; similarly, the MOS transistor not being turned on means that the source and drain of the MOS transistor are not connected, that is, the source and drain of the MOS transistor are disconnected.

[0073] Optionally, when the controller 1 obtains that the signal to be transmitted is a second USB data signal or an audio signal, it transmits a low-level signal to the gate of the first MOSFET 21 and the gate of the second MOSFET 22. That is, the second electrical signal is a low-level signal, the first MOSFET 21 does not conduct under the action of the second electrical signal, and the second MOSFET 22 conducts.

[0074] Wherein, the first USB data signal is a USB data signal under low insertion loss USB data transmission scenario; the second USB data signal is a USB data signal under scenario where low insertion loss USB data transmission is not required.

[0075] In this embodiment, if the controller 1 obtains a signal to be transmitted that does not include the first USB data signal, for example, if the signal to be transmitted is the second USB data signal or an audio signal, the first terminal of the controller 1 can output a low-level signal or not output any signal, which is equivalent to outputting a low-level signal. At this time, the NMOS transistor is not turned on, and the PMOS transistor is turned on.

[0076] It is worth noting that in this embodiment, controller 1 can output a low-level signal by default, or not output any signal at all. For example, if controller 1 does not acquire a transmission signal or acquires the first USB data signal to be transmitted, it outputs a low-level signal or does not output any signal. In this case, the first MOSFET 21 is not turned on, and the second MOSFET 22 is turned on. In this way, even if controller 1 freezes, the first MOSFET 21 remains off and the second MOSFET 22 remains on. Thus, the electronic device where the signal processing circuit is located and the external device connected to the USB interface 4 can still perform wired data interaction through the first data path.

[0077] In another implementation, the first MOS transistor can be a PMOS transistor and the second MOS transistor can be an NMOS transistor. In this case, the first electrical signal can be a low-level signal.

[0078] In other words, when controller 1 receives the signal to be transmitted, including the first USB data signal, it outputs a low-level signal through its first terminal to turn on the PMOS transistor and turn off the NMOS transistor. At this time, the first USB data signal bypasses the high insertion loss device in the second switching module 3 for transmission.

[0079] It is worth noting that in this embodiment, the first terminal of the controller 1 can output a high-level signal by default. For example, if the controller 1 obtains a signal to be transmitted that does not include the first USB data signal, for example, if the signal to be transmitted is the second USB data signal or an audio signal, or if the controller 1 does not obtain a signal to be transmitted, it outputs a high-level signal to make the PMOS transistor not conduct and the NMOS transistor conduct.

[0080] Optionally, in this embodiment, when the controller 1 obtains that the signal to be transmitted is a second USB data signal or an audio signal, the first terminal of the controller 1 can output a high-level signal, that is, the second electrical signal is a low-level signal, so that the first MOS transistor 21 is not turned on and the second MOS transistor 22 is turned on.

[0081] As an optional implementation method, such as Figure 4a As shown, the signal processing circuit provided in this application embodiment may further include: a filter network 5;

[0082] The first end of the filter network 5 is connected to the third end of the first switch module 2, the second end of the filter network 5 is connected to the USB interface 4, the third end of the filter network 5 is connected to the second end of the second switch module 3, and the first end of the second switch module 3 is connected to the second end of the first switch module 2.

[0083] In this embodiment, by adding a filter network to the signal processing circuit, interference signals in the data signal passing through the signal processing circuit can be filtered out, thereby further improving the communication quality of the data signal processed by the signal processing circuit.

[0084] As an optional implementation method, such as Figure 4b As shown, the signal processing circuit provided in this application embodiment may further include: an overvoltage protection (OVP) module 6;

[0085] The first end of the overvoltage protection module 6 is connected to the third end of the first switch module 2, and the second end of the overvoltage protection module 6 is connected to the control end of the first switch module 2.

[0086] When the overvoltage protection module 6 receives an electrical signal greater than the first threshold at its first terminal, the overvoltage protection module 6 sends a first signal to the control terminal of the first switch module 2. Based on the first signal, the first switch module 2 disconnects its first terminal from its third terminal.

[0087] In this embodiment, compared to, Figure 4a In the manner shown, an overvoltage protection module 6 is added between the first switch module 2 and the USB interface 4. When the overvoltage protection module 6 detects that the voltage on the USB interface 4 is too high, it controls the first terminal of the first switch module 2 to disconnect from the third terminal of the first switch module 2. In this way, it can prevent the voltage from flowing back through the first switch module 2 and causing damage to the signal processing circuit or even the electronic components in the electronic device where the signal processing circuit is located.

[0088] Optionally, the overvoltage protection module 6 includes a comparator 61 and a third MOSFET 62.

[0089] The input terminal of the comparator 61 is connected to the third terminal of the first switch module 2. The reference terminal of the comparator 61 receives the electrical signal of the first threshold. The output terminal of the comparator 61 is connected to the gate of the third MOS transistor 62. The source of the third MOS transistor 62 is connected to the control terminal of the first switch module 2. The drain of the third MOS transistor 62 is grounded.

[0090] When the electrical signal value obtained at the input terminal of the comparator 61 is greater than the electrical signal value at the reference terminal of the comparator 61, the output terminal of the comparator 61 outputs a third electrical signal, and the third MOS transistor 62 is turned on under the action of the third electrical signal. The first signal is a low-level signal.

[0091] It is worth noting that, given that the third terminal of the first switch module 2 is directly or indirectly connected to the USB interface 4, the connection between the input terminal of the comparator 61 and the third terminal of the first switch module 2 can be understood as the direct or indirect connection between the input terminal of the comparator 61 and the USB interface 4. In other words, if the electrical signal value obtained by the input terminal of the comparator 61 is greater than the electrical signal value at the reference terminal of the comparator 61, it can be understood that the electrical signal value obtained by the comparator 61 from the USB interface 4 exceeds a threshold, i.e., there is a risk of voltage backflow from the USB interface 4 to the controller 1.

[0092] In operation, given that the third terminal of the third MOSFET 62 is grounded, if the second terminal of the third MOSFET 62 and the third terminal of the third MOSFET 62 are connected, the control terminal of the first switch module 2 will be grounded. At this time, the first switch module 2 can disconnect the second terminal of the first switch module 2 and the third terminal of the first switch module 2 based on the low-level signal of the control terminal.

[0093] In one embodiment, the third MOSFET 62 can be an NMOS transistor. In this case, the third electrical signal output by the comparator 61 is a high-level signal. That is, when the input electrical signal value of the comparator 61 is greater than the reference signal value of the comparator 61, the output of the comparator 61 outputs a high-level signal. Conversely, when the input electrical signal value of the comparator 61 is less than or equal to the reference signal value of the comparator 61, the output of the comparator 61 outputs a low-level signal. In this case, the third MOSFET 62 is not turned on, and the first switch module 2 controls the switching state only according to the control signal from the controller 1.

[0094] In another embodiment, the third MOSFET 62 can be a PMOS transistor. In this case, the third electrical signal output by the comparator 61 is a low-level signal. That is, when the input electrical signal value of the comparator 61 is greater than the reference signal value of the comparator 61, the output of the comparator 61 outputs a low-level signal. Conversely, when the input electrical signal value of the comparator 61 is less than or equal to the reference signal value of the comparator 61, the output of the comparator 61 outputs a high-level signal.

[0095] It should be noted that, as Figure 4b In the embodiment shown, the first switching module 2 includes an NMOS transistor as an example. At this time, the drain of the third MOS transistor 62 is grounded. Thus, when the drain and source of the third MOS transistor 62 are turned on, the gate voltage of the NMOS transistor (first switching module 2) can be pulled low, thereby controlling the NMOS transistor (first switching module 2) to not be turned on.

[0096] However, in other embodiments, the first switching module 2 may include a PMOS transistor or even other components. In this case, the drain of the third MOS transistor 62 can be connected to other signal sources. For example, assuming the first switching module 2 is a PMOS transistor, the drain of the third MOS transistor 62 can be connected to a high-level signal source. In this way, when the drain and source of the third MOS transistor 62 are turned on, the gate voltage of the PMOS transistor (first switching module 2) can be pulled high, thereby controlling the PMOS transistor (first switching module 2) to not be turned on.

[0097] It should be noted that, in addition to the comparator 61 and the third MOSFET 62 mentioned above, the overvoltage protection module 6 may also include other circuit structures or electronic components, such as: Figure 4b As shown, the overvoltage protection module 6 also includes a voltage divider circuit composed of a first resistor R1 and a second resistor R2. The first resistor R1 and the second resistor R2 are connected in series between the first end of the filter network 5 and the ground end, and the input end of the comparator 61 is connected between the first resistor R1 and the second resistor R2. In this way, through the voltage division of the first resistor R1 and the second resistor R2, the level obtained by the input end of the comparator 61 can be kept within a reasonable range and can be used to compare with the reference level of the comparator 61 to determine whether there is a risk of voltage reverse flow.

[0098] The resistance values ​​of the first resistor R1 and the second resistor R2 are related to the operating voltage of the USB interface 4 and the reference voltage of the reference terminal of the comparator 61, and are not specifically limited here.

[0099] In addition, the overvoltage protection module 6 may also include, besides, Figure 4b Other circuits or components besides the comparator 61 and the third MOSFET 62 shown only need to enable the overvoltage protection module 6 to determine whether the voltage on the USB interface 4 is too high, and to control the first switch module 2 to disconnect the USB interface 4 from the AP when the voltage on the USB interface 4 is too high. For example, the overvoltage protection module 6 can only contain a comparator, and the output terminal of the comparator can be directly connected to the control terminal of the first switch module 2 so that the first switch module 2 switches the switching state based on the output signal of the comparator. The specific structure and principle of the overvoltage protection module 6 are not specifically limited here.

[0100] Optionally, the overvoltage protection module 6 can operate only during the period when the first terminal and the third terminal of the first switch module 2 are connected. In this way, during the period when the first terminal and the third terminal of the first switch module 2 are disconnected, the voltage on the USB interface 4 will not flow back to the controller 1 and other components through the first switch module 2, thereby making the overvoltage protection module 6 not work. For example, when the controller 1 controls the first terminal and the third terminal of the first switch module 2 to be connected, it sends a first control signal to the overvoltage protection module 6 to control the overvoltage protection module 6 to start working; and / or, when the controller 1 controls the first terminal and the third terminal of the first switch module 2 to be disconnected, it sends a second control signal to the overvoltage protection module 6 to control the overvoltage protection module 6 to stop working.

[0101] This prevents the overvoltage protection module 6 from performing unnecessary operations.

[0102] As an optional implementation method, such as Figure 4c As shown, the first switch module 2 includes: a first NAND gate logic module 23, a second NAND gate logic module 24, a third NAND gate logic module 25, and a NOT gate logic module 26;

[0103] The first input terminal of the first NAND gate logic module 23 is connected to the first terminal of the controller 1, the second input terminal of the first NAND gate logic module 23 is connected to the second terminal of the controller 1, and the output terminal of the first NAND gate logic module 23 is connected to the first input terminal of the third NAND gate logic module 25.

[0104] The first input terminal of the second NAND gate logic module 24 is connected to the first terminal of the controller 1 through the NOT gate logic module 26, the second input terminal of the second NAND gate logic module 24 is connected to the second terminal of the controller 1, and the output terminal of the second NAND gate logic module 24 is connected to the second input terminal of the third NAND gate logic module 25.

[0105] The output of the third NAND gate logic module 25 is connected to the USB interface 4;

[0106] When the signal to be transmitted is received, including the first USB data signal, the first terminal of the controller 1 outputs a high-level signal. Under the action of the high-level signal, the second input terminal of the first NAND gate logic module 23 and the output terminal of the third NAND gate logic module 25 are connected; or...

[0107] If the signal to be transmitted does not include the first USB data signal, the first terminal of the controller outputs a low-level signal. Under the action of the low-level signal, the second input terminal of the second NAND gate logic module 24 and the output terminal of the third NAND gate logic module 25 are connected.

[0108] The NAND gate logic module includes two input terminals and one output terminal. Its working principle is as follows: when both input terminals are "1", the output is "0"; when at least one of the two input terminals is "0", the output is "1". Here, "1" can represent a signal or a high-level signal, and "0" can represent a no-signal or low-level signal.

[0109] In this embodiment, the truth table of the first switch module 2 is shown in Table 1 below:

[0110] Table 1

[0111]

[0112]

[0113] As shown in Table 1 above, USB-EN represents the signal output from the first terminal of controller 1; DATA0 represents the low-insertion-loss or lossless transmission signal output from the second terminal of controller 1; DATA1 represents the transmission signal with insertion loss or high insertion loss output from the second terminal of controller 1 and processed by the second switch module 3; DATA-OUT represents the signal output from the third terminal of the first switch module 2, i.e., the output terminal of the third NAND gate logic module 25.

[0114] In this embodiment, the first switching module 2 is a two-to-one logic circuit composed of three NAND gate logic modules and one NOT gate logic module, which has higher reliability compared to switching circuits such as MOSFETs.

[0115] It should be noted that the instruction manual includes... Figure 4c In addition, a target module X is provided between the first switch module 2 and the USB interface 4. The target module X may include at least one of a filter network 5 and an overvoltage protection module 6.

[0116] As an optional implementation method, such as Figure 5 As shown, the signal processing circuit provided in this embodiment further includes: a radio frequency coaxial cable 7;

[0117] The radio frequency coaxial cable 7 serves as at least a portion of the conductive line between the second end of the controller 1 and the USB interface 4.

[0118] Using the radio frequency coaxial cable 7 as at least part of the conductive line between the second end of the controller 1 and the USB interface 4 can reduce the insertion loss of the conductive line on the transmitted data signal compared to using ordinary wires as the conductive line between the second end of the controller 1 and the USB interface 4.

[0119] In one implementation, as shown Figure 4aTaking the signal processing circuit shown as an example, at least a portion of the conductive lines between the second terminal of the controller 1 and the USB interface 4 may include at least one of the following:

[0120] The conductive line between the second terminal of controller 1 and the first terminal of the first switch module 2;

[0121] The conductive line between the third terminal of the first switch module 2 and the filter network 5;

[0122] Conductive lines between filter network 5 and USB interface 4;

[0123] The conductive line between the second end of the first switch module 2 and the first end of the second switch module 3;

[0124] The conductive line between the second end of the second switch module 3 and the filter network 5.

[0125] Of course, the signal processing circuit can also have other circuit structures or include other components, and at least part of the conductive lines between the second terminal of the controller 1 and the USB interface 4 can also be adjusted accordingly. For example, if the signal processing circuit includes the OVP module 6 and the filter network 5, the at least part of the conductive lines between the second terminal of the controller 1 and the USB interface 4 can also include: the conductive lines between the filter network 5 and the OVP module 6, the conductive lines between the OVP module 6 and the USB interface 4, etc. No specific limitation is made here regarding the at least part of the conductive lines between the second terminal of the controller 1 and the USB interface 4.

[0126] In one embodiment, at least a portion of the conductive lines between the second end of the controller 1 and the USB interface 4 may include conductive lines with a length greater than or equal to a preset length.

[0127] For example: Figure 5 As shown, assuming the electronic device containing the signal processing circuit includes a motherboard 501 and a sub-board 502, some components of the signal processing circuit, including the controller 1, are located on the motherboard 501, and other components, including the USB interface 4, are located on the sub-board 502. Given that the motherboard 501 and the sub-board 502 are far apart, at least a portion of the conductive lines between the second end of the controller 1 and the USB interface 4 may include the conductive lines of the signal processing circuit connected between the motherboard 501 and the sub-board 502.

[0128] For example: Suppose that... Figure 4aThe controller 1, first switch module 2, second switch module 3 and filter network 5 in the signal processing circuit shown are set on the main board 501, and the USB interface 4 is set on the sub-board 502. The first end of the RF coaxial cable 7 is connected to the main board 501 and connected to the filter network 5 through the circuit on the main board 501. The second end of the RF coaxial cable 7 is connected to the sub-board 502 and connected to the USB interface 4 through the circuit on the sub-board 502.

[0129] The motherboard 501 can be a circuit board within an electronic device that houses core components such as a system-on-chip (SOC), a power management IC (PMIC), and a microcontroller unit (MCU). The secondary board 502 can be a circuit board within an electronic device that houses modules such as a Type-C processing module and a subscriber identity module (SIM) card. Typically, the motherboard 501 is located on the upper side of the electronic device, and the secondary board 502 is located on the lower side.

[0130] It is worth mentioning that, in addition to transmitting wired signals, the RF coaxial cable 7 can also be used to transmit RF signals. That is, the RF coaxial cable 7 serves as the RF coaxial cable in the antenna module of the electronic device containing the multiplexed signal processing circuit. In this case, by using the RF coaxial cable 7 as the D+ and D- transmission path, the trace area of ​​the flexible printed circuit (FPC) between the main board 501 and the sub-board 502 can be saved, as can the number of pins for the corresponding board-to-board (BTB) interface, thereby reducing the production cost of the electronic device. Furthermore, given that the coaxial cable has a lower impedance than the FPC, it results in less insertion loss for transmitted signals, making it more suitable for data transmission scenarios requiring low insertion loss.

[0131] In one embodiment, when the RF coaxial cable 7 is multiplexed with the D+ and D- transmission paths, since the RF coaxial cable also needs to transmit RF signals, a time-division multiplexing method can be adopted to construct a time-division multiplexing system to divide the D+, D- transmission paths and RF paths into time. For example, in scenarios such as vehicle infotainment systems, the RF coaxial cable 7 is used to transmit USB signals, while in other scenarios, the RF coaxial cable 7 is used to transmit RF signals normally.

[0132] In another embodiment, the signal processing circuit provided in this application further includes: a first modulator 8 and a first demodulator 9;

[0133] The first modulator 8 is connected to the first end of the radio frequency coaxial line 7, and the first demodulator 9 is connected to the second end of the radio frequency coaxial line 7.

[0134] The first modulator 8 is used to modulate the signal to be transmitted and the radio frequency signal into a target signal;

[0135] The first demodulator 9 is used to demodulate the signal to be transmitted and the radio frequency signal from the target signal.

[0136] The first end of the radio frequency coaxial cable 7 may include: an end of the radio frequency coaxial cable 7 for electrical connection with the controller 1, and / or an end of the radio frequency coaxial cable 7 for electrical connection with the USB interface 4.

[0137] The second end of the radio frequency coaxial line 7 may include: one end of the radio frequency coaxial line 7 for electrical connection with the USB interface 4, and / or, one end of the radio frequency coaxial line 7 for electrical connection with the controller 1.

[0138] For example: Figure 6 As shown, a first modulator 8 and a first demodulator 9 can be respectively set at both ends of the radio frequency coaxial line 7. After the radio frequency signal and the USB signal are modulated by the first modulator 8, the modulated target signal is transmitted to the first demodulator 9 through the radio frequency coaxial line 7. The first demodulator 9 demodulates the radio frequency signal and the USB signal from the target signal transmitted by the radio frequency coaxial line 7, and transmits the demodulated radio frequency signal to the corresponding radio frequency path, and transmits the demodulated USB signal to the corresponding USB data transmission path.

[0139] It should be noted that the instruction manual includes... Figure 6 In this example, the first modulator 8 and the first demodulator 9 are used to modulate and demodulate the radio frequency signal and the USB signal output by the electronic device where the signal processing circuit is located. In another embodiment, the modulator can be connected between the radio frequency coaxial line 7 and the USB interface 4, and the demodulator can be connected between the radio frequency coaxial line 7 and the USB signal receiving device (such as the controller 1) and the radio frequency signal receiving device (such as the radio frequency chip). In this case, the modulator and demodulator are used to modulate and demodulate the USB signal transmitted by the external device connected to the USB interface 4 to the electronic device where the signal processing circuit is located through the USB interface 4 and the radio frequency signal received by the electronic device where the signal processing circuit is located.

[0140] Alternatively, two first modulators 8 and two first demodulators 9 can be configured. One first modulator 8 and one first demodulator 9 are used to modulate and demodulate the radio frequency signal and USB signal output by the electronic device where the signal processing circuit is located. The other first modulator 8 and the other first demodulator 9 are used to modulate and demodulate the USB signal transmitted by the external device connected to the USB interface 4 to the electronic device where the signal processing circuit is located through the USB interface 4, as well as the radio frequency signal received by the electronic device where the signal processing circuit is located.

[0141] Compared to the scheme of time-division multiplexing the RF coaxial cable 7 for the RF path and USB data path, this embodiment can multiplex the RF coaxial cable 7 to transmit RF signals and USB signals simultaneously. Thus, when transmitting USB signals, the RF signal-based communication capability of the electronic device containing the signal processing circuit will not be affected.

[0142] This application also provides an electronic device, which includes, as described above... Figures 2 to 6 The signal processing circuit in any of the embodiments shown.

[0143] The electronic devices provided in this application can be mobile phones, tablets, laptops, smartwatches, or other devices that can connect to external devices (such as in-vehicle systems) via wired connections and perform USB data transmission. The types of electronic devices are not exhaustive.

[0144] For example, by using a USB data cable, one end can be connected to the USB port of the mobile phone, and the other end can be connected to the USB socket of the car's infotainment system. This allows for a wired connection between the mobile phone and the car's infotainment system, enabling USB data signal exchange between them.

[0145] It is worth noting that the embodiments of this application are based on, as follows Figures 2 to 6 The signal processing circuit in any of the embodiments shown can improve the USB data signal interaction performance between the electronic device and the external device, and improve the stability of the USB connection between the electronic device and the external device. For example, when the USB signal transmitted between the mobile phone and the vehicle's infotainment system fluctuates due to bumpy road conditions, based on... Figures 2 to 6 In any of the embodiments shown, the signal processing circuit conducts a second data path with low insertion loss, that is, the first end of the first switch module 2 and the third end of the first switch module 2 are connected. At this time, the insertion loss of the USB signal between the mobile phone and the vehicle can be reduced, thereby reducing the risk of USB connection between the mobile phone and the vehicle due to excessive insertion loss in this scenario.

[0146] Optionally, such as Figure 5 As shown, the electronic device provided in this application embodiment includes a motherboard 501 and a sub-board 502;

[0147] The first device in the signal processing circuit is located on the main board 501, and the second device in the signal processing circuit is located on the sub-board 502;

[0148] The line between the first device and the second device is a radio frequency coaxial cable 7.

[0149] Wherein, the first device includes a controller 1, or the first device includes a controller 1 and at least one of a first switching module 2, a filter network 5 and an overvoltage protection module 6;

[0150] The second device includes a USB interface 4, or the second device includes a USB interface 4 and at least one of a first switch module 2, a filter network 5, and an overvoltage protection module 6.

[0151] It should be noted that, in implementation, controller 1 is fixedly mounted on the main board 501, and USB interface 4 is fixedly mounted on the sub-board 502. Other components in the signal processing circuit, such as the first switch module 2, filter network 5, and overvoltage protection module 6, can be mounted on either the main board 501 or the sub-board. In this case, the components connected to both ends of the RF coaxial cable 7 can be adjusted adaptively, as long as the RF coaxial cable 7 is connected between the main board 501 and the sub-board 502. For specific connection methods, please refer to the relevant descriptions in the above signal processing circuit embodiment, which will not be repeated here.

[0152] In this embodiment, the ordinary conductive lines, such as FPC, between the motherboard 501 and the sub-board 502 are replaced by an RF coaxial cable 7. This reduces the insertion loss of USB signals transmitted through the RF coaxial cable 7, making it more suitable for data transmission scenarios with low insertion loss requirements.

[0153] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0154] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A signal processing circuit, characterized by comprising: The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device.

2. The signal processing circuit of claim 1, wherein, The application relates to a USB interface control device. The application relates to a USB interface control device.

3. The signal processing circuit of claim 2, wherein, The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device.

4. The signal processing circuit of claim 3, wherein, The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control device. The application relates to a USB interface control 5. The signal processing circuit of claim 1, wherein, The first switch module comprises a first NAND gate logic module, a second NAND gate logic module, a third NAND gate logic module and a NOT gate logic module. The first input end of the first NAND gate logic module is connected with the first end of the controller, the second input end of the first NAND gate logic module is connected with the second end of the controller, and the output end of the first NAND gate logic module is connected with the first input end of the third NAND gate logic module. The first input end of the second NAND gate logic module is connected with the first end of the controller through the NOT gate logic module, the second input end of the second NAND gate logic module is connected with the second end of the controller, and the output end of the second NAND gate logic module is connected with the second input end of the third NAND gate logic module. The output end of the third NAND gate logic module is connected with the USB interface. In the case that the to-be-transmitted signal comprises the first USB data signal, the first end of the controller outputs a high-level signal, and under the action of the high-level signal, the second input end of the first NAND gate logic module and the output end of the third NAND gate logic module are turned on; or In the case that the to-be-transmitted signal does not comprise the first USB data signal, the first end of the controller outputs a low-level signal, and under the action of the low-level signal, the second input end of the second NAND gate logic module and the output end of the third NAND gate logic module are turned on.

6. The signal processing circuit according to any one of claims 1 to 5, characterized by, The second switch module comprises at least one of a USB switch and a Type-C switch.

7. The signal processing circuit according to any one of claims 1 to 5, characterized by, Further comprising: a filter network; The first end of the filter network is connected with the third end of the first switch module, the second end of the filter network is connected with the USB interface, the third end of the filter network is connected with the second end of the second switch module, and the first end of the second switch module is connected with the second end of the first switch module.

8. The signal processing circuit according to any one of claims 1 to 5, characterized by Further comprising: a radio frequency coaxial line; The radio frequency coaxial line serves as at least part of a conductive circuit between the second end of the controller and the USB interface.

9. The signal processing circuit of claim 8, wherein, Further comprising: a first modulator and a first demodulator; The first modulator is connected with the first end of the radio frequency coaxial line, and the first demodulator is connected with the second end of the radio frequency coaxial line; The first modulator is configured to modulate the to-be-transmitted signal and a radio frequency signal into a target signal; The first demodulator is configured to demodulate the to-be-transmitted signal and the radio frequency signal from the target signal.

10. The signal processing circuit of any one of claims 1 to 5, wherein, Further comprising: an overvoltage protection module; The first end of the overvoltage protection module is connected with the third end of the first switch module, and the second end of the overvoltage protection module is connected with the control end of the first switch module; In the case that an electrical signal greater than a first threshold value is obtained at the first end of the overvoltage protection module, the second end of the overvoltage protection module sends a first signal to the control end of the first switch module, and the first switch module disconnects the first end of the first switch module from the third end of the first switch module based on the first signal.

11. The signal processing circuit of claim 10, wherein, The overvoltage protection module comprises a comparator and a third MOS tube. An input end of the comparator is connected with a third end of the first switch module, a reference end of the comparator receives an electrical signal of the first threshold value, an output end of the comparator is connected with a gate of the third MOS tube, a source of the third MOS tube is connected with a control end of the first switch module, and a drain of the third MOS tube is grounded. In a case where the electrical signal value obtained at the input end of the comparator is greater than the electrical signal value at the reference end of the comparator, the output end of the comparator outputs a third electrical signal, the third MOS tube is turned on under the action of the third electrical signal, and the first signal is a low-level signal.

12. An electronic device, comprising: The signal processing circuit comprises the first device and the second device.

13. The electronic device of claim 12, wherein, The electronic device comprises a main board and a sub-board. The first device in the signal processing circuit is located on the main board, and the second device in the signal processing circuit is located on the sub-board. A line between the first device and the second device is a radio frequency coaxial line.

14. The electronic device of claim 13, wherein, The first device comprises a controller, or the first device comprises the controller and at least one of a first switch module, a filter network and an overvoltage protection module. The second device comprises a USB interface, or the second device comprises the USB interface and at least one of a first switch module, a filter network and an overvoltage protection module.

Images