Signal acquisition circuit and electronic equipment

Abstract

The utility model discloses a signal acquisition circuit and electronic equipment. The signal acquisition circuit comprises a first branch and a second branch, the first branch is used for acquiring and determining a target digital signal according to an original signal, the second branch is used for acquiring and determining a target analog signal according to the original signal, and the original signal is input to the signal acquisition circuit from the outside of the signal acquisition circuit. According to the invention, the signal acquisition circuit is provided with two branches for acquiring the analog signal and the digital signal, so that even if the category of the original signal cannot be clearly determined, the signal acquisition circuit can acquire the analog signal and the digital signal; according to the invention, the two branches can be directly used for processing and operating the original signal at the same time to obtain the output signal with the same category as the original signal, so that the accurate signal acquisition process aiming at the category corresponding to the original signal is completed, a device for executing screening between an analog signal and a digital signal does not need to be independently arranged, and the circuit design is effectively simplified.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, specifically to a signal acquisition circuit and electronic device. Background Technology

[0002] In current technologies, when electronic devices collect input signals from the external environment, it is difficult to perform targeted and accurate signal acquisition if the type of the external input signal is unclear or it is impossible to determine whether the external input signal is an analog signal or a digital signal. Utility Model Content

[0003] This application provides a signal acquisition circuit and an electronic device.

[0004] The signal acquisition circuit involved in the embodiments of this application includes a first branch and a second branch. The first branch is used to determine a target digital signal based on the acquisition of the original signal, and the second branch is used to determine a target analog signal based on the acquisition of the original signal, wherein the original signal is input to the signal acquisition circuit from outside the signal acquisition circuit.

[0005] Thus, by configuring two branches in the signal acquisition circuit for acquiring analog signals and one for acquiring digital signals, even when the category of the original signal cannot be clearly determined, the two branches can be used simultaneously to process and operate the original signal to obtain an output signal of the same category as the original signal. This completes the accurate signal acquisition process for the category corresponding to the original signal, and eliminates the need for a separate analog-to-digital filtering device, effectively simplifying the circuit design.

[0006] In some embodiments, the first branch includes a first voltage divider protection module and a first operational amplifier module. The first voltage divider protection module is used to process the original signal into a first response signal, wherein the voltage of the first response signal conforms to the input voltage range of the first operational amplifier module.

[0007] The first operational amplifier module is configured to determine the target digital signal based on the first response signal.

[0008] In some embodiments, the first voltage divider protection module includes a first resistor, a second resistor, and a first Zener diode. The first end of the first resistor is used to connect to the original signal, and the second end of the first resistor is simultaneously connected to the first end of the second resistor, the first operational amplifier module, and the cathode of the first Zener diode. The anode of the first Zener diode is used to ground, and the second end of the second resistor is used to ground.

[0009] In some embodiments, the first operational amplifier module includes a first power supply sub-circuit, a reference sub-circuit, and a first operational amplifier, wherein the first power supply sub-circuit is used to supply power to the first operational amplifier, the reference sub-circuit is connected to the inverting input port of the first operational amplifier, and the reference sub-circuit is used to provide a reference voltage for determining high and low levels.

[0010] In some implementations, the non-inverting input port of the first operational amplifier is connected to the first terminal of the second resistor, the positive power supply port of the first operational amplifier is connected to the first power supply sub-circuit, the negative power supply port of the first operational amplifier is grounded, and the output port of the first operational amplifier outputs the target digital signal.

[0011] In some embodiments, the second branch includes a second voltage divider protection module and a second operational amplifier module. The second voltage divider protection module is used to process the original signal into a second response signal, wherein the voltage of the second response signal conforms to the input voltage range of the second operational amplifier module.

[0012] The second operational amplifier module is configured to determine the target analog signal based on the second response signal.

[0013] In some embodiments, the second voltage divider protection module includes a third resistor, a fourth resistor, and a second Zener diode. The first end of the third resistor is used to connect to the original signal, and the second end of the third resistor is simultaneously connected to the first end of the fourth resistor, the second operational amplifier module, and the cathode of the second Zener diode. The anode of the second Zener diode is used to ground, and the second end of the fourth resistor is used to ground.

[0014] In some embodiments, the second operational amplifier module includes a second power supply sub-circuit, a voltage control sub-circuit, and a second operational amplifier, wherein the second power supply sub-circuit is used to supply power to the second operational amplifier, and the voltage control sub-circuit is used to control the voltage of the second response signal to be equal to the voltage of the original signal.

[0015] In some embodiments, the non-inverting input port of the second operational amplifier is connected to the first terminal of the fourth resistor, the positive power supply port of the second operational amplifier is connected to the second power supply sub-circuit, the negative power supply port of the second operational amplifier is grounded, the first terminal of the voltage control sub-circuit is connected to the inverting input port of the second operational amplifier, the second terminal of the voltage control sub-circuit is connected to the output port of the second operational amplifier, and the output port of the second operational amplifier outputs the target analog signal.

[0016] The electronic device in this application includes the signal acquisition circuit described above.

[0017] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is a schematic diagram of the module structure of the signal acquisition circuit in the embodiment of this application;

[0020] Figure 2 This is one of the circuit structure diagrams of the signal acquisition circuit in the embodiments of this application;

[0021] Figure 3 This is the second schematic diagram of the circuit structure of the signal acquisition circuit in the embodiments of this application.

[0022] Wherein, 11 is the first branch; 111 is the first voltage divider protection module; 112 is the first operational amplifier module; 1121 is the first power supply sub-circuit; 1122 is the reference sub-circuit; 12 is the second branch; 121 is the second voltage divider protection module; 122 is the second operational amplifier module; 1221 is the second power supply sub-circuit; 1222 is the voltage control sub-circuit; R1 is the first resistor; R2 is the second resistor; R3 is the third resistor; R4 is the fourth resistor; R5 is the fifth resistor; R6 is the sixth resistor; R7 is the seventh resistor; D1 is the first Zener diode; D2 is the second Zener diode; U1 is the first operational amplifier; U2 is the second operational amplifier; C1 is the first capacitor; C2 is the second capacitor; C3 is the third capacitor; C4 is the fourth capacitor; C5 is the fifth capacitor. Detailed Implementation

[0023] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0024] Please see Figure 1 The signal acquisition circuit in this application includes a first branch 11 and a second branch 12. The first branch 11 is used to determine the target digital signal based on the original signal acquisition, and the second branch 12 is used to determine the target analog signal based on the original signal acquisition. The original signal is input to the signal acquisition circuit from outside the signal acquisition circuit.

[0025] Specifically, the signal acquisition circuit disclosed in this application is mainly used for accurate signal acquisition of raw signals with unclear signal categories. The signal acquisition circuit is divided into two branches, and the connection point between the two branches is the input point of the raw signal. The two branches are used for acquiring digital signals and analog signals, respectively. It is worth noting that since no components are set between the two branches to filter analog and digital signals, regardless of whether the raw signal is analog or digital, after the signal processing of the two branches, each branch will output a corresponding electrical signal. However, only the signal output by the branch corresponding to the category of the raw signal is the target signal obtained after acquisition.

[0026] For example, exemplarily, if the first branch 11 is a digital signal acquisition branch and the second branch 12 is an analog signal acquisition branch, assuming the original signal is a digital signal, then after processing by the two branches, the target digital signal output by the first branch 11 is the acquired target signal, while the electrical signal output by the second branch 12 is only related to the original signal in terms of electrical parameters such as voltage, but this signal is not the acquired target signal and cannot be used as the output result of the aforementioned signal acquisition circuit. Conversely, if the original signal is an analog signal, then similarly, the target analog signal output by the second branch 12 is the acquired target signal, while the electrical signal output by the first branch 11 is only related to the original signal in terms of electrical parameters such as voltage, but this signal is not the acquired target signal and cannot be used as the output result of the aforementioned signal acquisition circuit.

[0027] In this way, by performing simple calculations on the original signal, the original signal with an unclear signal category can be processed through the branch corresponding to the signal category, thereby achieving the accurate acquisition process of the original signal. There is no need to set up separate screening devices for analog or digital signals, which effectively simplifies the circuit design.

[0028] Thus, by configuring two branches in the signal acquisition circuit for acquiring analog signals and one for acquiring digital signals, even when the category of the original signal cannot be clearly determined, the two branches can be used simultaneously to process and operate the original signal to obtain an output signal of the same category as the original signal. This completes the accurate signal acquisition process for the category corresponding to the original signal, and eliminates the need for a separate analog-to-digital filtering device, effectively simplifying the circuit design.

[0029] In some implementations, please refer to [the relevant documentation]. Figure 1 The first branch 11 includes a first voltage divider protection module 111 and a first operational amplifier module 112. The first voltage divider protection module 111 is used to process the original signal into a first response signal, wherein the voltage of the first response signal conforms to the input voltage range of the first operational amplifier module 112.

[0030] The first operational amplifier module 112 is configured to determine the target digital signal based on the first response signal.

[0031] Specifically, based on the above embodiments, for the modular structure of the first branch 11 used for processing and acquiring digital signals, the first branch 11, exemplarily, includes a first voltage divider protection module 111 and a first operational amplifier module 112. The main function of the first voltage divider protection module 111 is to perform voltage divider processing on the original signal input to the first branch 11 to obtain a first response signal. Compared with the original signal, the voltage of the first response signal can be guaranteed to meet the input voltage range allowed by the first operational amplifier module 112, thereby ensuring the safety of the first operational amplifier module 112 and the first branch 11 as a whole. The first operational amplifier module 112 is the main functional module of the first branch 11. Its main function is to perform signal processing on the first response signal obtained by the first voltage divider protection module 111 to output a corresponding electrical signal. When the original signal is a digital signal, the electrical signal output by the first operational amplifier module 112 is the target digital signal, thereby completing the digital signal acquisition process for the original signal.

[0032] Please see Figure 2 In some embodiments, the first voltage divider protection module 111 includes a first resistor R1, a second resistor R2, and a first Zener diode D1. The first end of the first resistor R1 is used to receive the original signal, and the second end of the first resistor R1 is connected to the first end of the second resistor R2, the first operational amplifier module 112, and the cathode of the first Zener diode D1. The anode of the first Zener diode D1 is used to ground, and the second end of the second resistor R2 is used to ground.

[0033] Specifically, please refer to Figure 2 For the specific circuit structure of the first branch 11, please refer to the example provided. Figure 2 The multiple rectangular blocks shown include, for the first voltage divider protection module 111, a first resistor R1, a second resistor R2, and a first Zener diode D1. The first end of R1 is connected to the input port IO-IN of the original signal to receive the original signal. The second end of R1 is also connected to the first end of R2, the cathode of D1, and the first operational amplifier module 112. Furthermore, the second end of R2 is grounded, and the anode of D1 is grounded.

[0034] For the first resistor R1, the second resistor R2, and the first Zener diode D1 in the first voltage divider protection module 111, the following effect can be achieved by using the connection method in the example above:

[0035] Firstly, the original signal introduced into the first branch 11 is first subjected to voltage division processing using the connection relationship between R1 and R2. The voltage ratio between the first response signal obtained from the voltage division processing and the original signal is adjusted by setting the resistance values ​​of R1 and R2. For example, in... Figure 2 The resistance values ​​of both R1 and R2 are 200kΩ. It should be noted that... Figure 2 The values ​​of R1 and R2 shown are only examples. In actual applications, the resistance values ​​of R1 and R2 can be adjusted according to the electrical parameters of the first operational amplifier module 112 or the actual voltage division requirements. The above examples should not be construed as limiting the first resistor R1 and the second resistor R2.

[0036] Secondly, the first Zener diode D1 is used to protect the components in the first operational amplifier module 112 and the entire first branch 11. If the original signal voltage is too large, the voltage of the first response signal obtained after voltage division by R1 and R2 may still exceed the maximum limit of the input voltage range of the first operational amplifier module 112. In this case, D1 can be broken down to form a short circuit, thereby directly guiding the signal to ground to protect the first operational amplifier module 112. That is, the critical reverse breakdown voltage of the first Zener diode D1 is related to the maximum limit of the input voltage range of the first operational amplifier module 112, and the specific value of the above-mentioned critical reverse breakdown voltage is finely adjusted according to the actual situation of the components, which is not specifically limited in this application. Under the protection of the first voltage divider protection module 111, the first operational amplifier module 112 can perform calculation processing according to the first response signal obtained after voltage division processing, thereby obtaining the corresponding target digital signal.

[0037] Please continue reading. Figure 2 In some embodiments, the first operational amplifier module 112 includes a first power supply sub-circuit 1121, a reference sub-circuit 1122, and a first operational amplifier U1. The first power supply sub-circuit 1121 is used to supply power to the first operational amplifier U1, the reference sub-circuit 1122 is connected to the inverting input port of the first operational amplifier U1, and the reference sub-circuit 1122 is used to provide a reference voltage for determining the high and low levels.

[0038] Furthermore, in some embodiments, the non-inverting input port of the first operational amplifier is connected to the first end of the second resistor, the positive power supply port of the first operational amplifier is connected to the first power supply sub-circuit 1121, the negative power supply port of the first operational amplifier is used for grounding, and the output port of the first operational amplifier outputs the target digital signal.

[0039] Specifically, based on the above implementation method, for the first operational amplifier module 112, please refer to... Figure 2Specifically, it includes three parts: a first power supply sub-circuit 1121, a reference sub-circuit 1122, and a first operational amplifier U1. In the above embodiment, the first response signal is introduced into U1 from the non-inverting input port +IN, which can generally be achieved by connecting the first end of the second resistor R2 to the non-inverting input port +IN of U1. In addition, the output port OUT of U1 outputs the digital signal Digial-IN corresponding to the first response signal.

[0040] The first power supply sub-circuit 1121 is connected to the positive power supply port +VS of the first operational amplifier U1, and its function is to supply power to U1. In addition, the negative power supply port -VS of the first operational amplifier U1 is grounded, thus forming a power supply loop for the first operational amplifier U1. For the circuit structure of the first power supply sub-circuit 1121, exemplarily, the first power supply sub-circuit 1121 includes one or more parallel capacitors connected between the external power supply VCC and ground. The capacitance value of the capacitors can be adjusted according to actual conditions. For example… Figure 2 In the example shown, the first power supply sub-circuit 1121 includes a first capacitor C1 and a second capacitor C2, wherein the capacitance of C1 is 100μF and the capacitance of C2 is 10μF. Besides Figure 2 Apart from the example shown, the number of capacitors included in the first power supply sub-circuit 1121 and the capacitance value of each capacitor can be adjusted according to actual conditions, and this application does not impose specific limitations.

[0041] Next, the reference circuit 1122 is connected to the inverting input port -IN of the first operational amplifier U1. Its function is to provide a comparison reference for the output signal of the first operational amplifier U1. Let the voltage at the inverting input port -IN of U1 be VB, and the voltage of the first response signal be VA. Then, when VA is greater than or equal to VB, the output port OUT of U1 outputs a high level; when VA is less than VB, the output port OUT of U1 outputs a low level. That is, the value of VB defines the voltage boundary between high and low levels. When the original signal is a digital signal, the first response signal is also a digital signal. With an appropriate VB value setting, the signal Digial-IN output according to the above comparison process can be exactly the same as the original signal, thus realizing the acquisition of digital signals. For the circuit structure of the reference circuit 1122, please refer to [link to relevant documentation]. Figure 2 For example, the reference sub-circuit 1122 includes a fifth resistor R5 and a sixth resistor R6, wherein the first terminal of R5 is connected to the external power supply VCC, the second terminal of R5 is connected to the first terminal of R6, the second terminal of R6 is grounded, and the connection point of R5 and R6 is connected to the inverting input port -IN of U1. Regarding the resistance values ​​of R5 and R6, Figure 2The example given is R5 as 24kΩ and R6 as 75kΩ. In practical applications, the resistance values ​​of R5 and R6 can be adjusted according to the required voltage VB at the inverting input port -IN of U1. This application does not impose specific limitations. Optionally, a variable resistor can be used to replace R5 and R6 to adjust the voltage VB at the inverting input port -IN of U1, thereby quickly adjusting the above-mentioned comparison reference.

[0042] In summary, the original signal enters the first branch 11 via the input port IO-IN. Firstly, the first resistor R1 and the second resistor R2 in the first voltage divider protection module 111 perform voltage division to obtain the first response signal, with a voltage of VA. Simultaneously, the first Zener diode D1 protects the first operational amplifier module 112 to prevent VA from exceeding the maximum input voltage range of the first operational amplifier module 112. The first response signal is input from the non-inverting input port +IN of the first operational amplifier U1. The voltage VA of the first response signal is compared with the voltage VB at the inverting input port -IN of the first operational amplifier U1. Based on the result of the comparison, the corresponding voltage signal Digital-IN is output from the output port OUT of the first operational amplifier U1. If the original signal is a digital signal, the voltage signal Digital-IN output from the output port OUT of the first operational amplifier U1 is the target digital signal, which is identical to the original signal, thus completing the digital signal acquisition process.

[0043] Please see Figure 3 In some embodiments, the second branch 12 includes a second voltage divider protection module 121 and a second operational amplifier module 122. The second voltage divider protection module 121 is used to process the original signal into a second response signal, wherein the voltage of the second response signal conforms to the input voltage range of the second operational amplifier module 122.

[0044] The second operational amplifier module 122 is configured to determine the target analog signal based on the second response signal.

[0045] Specifically, based on the above embodiments, for the modular structure of the second branch 12 used for processing and acquiring analog signals, the second branch 12, exemplarily, includes a second voltage divider protection module 121 and a second operational amplifier module 122. The main function of the second voltage divider protection module 121 is to perform voltage division processing on the original signal input to the second branch 12 to obtain a second response signal. Compared with the original signal, the voltage of the second response signal can be guaranteed to meet the input voltage range allowed by the second operational amplifier module 122, thereby ensuring the safety of the second operational amplifier module 122 and the second branch 12 as a whole. The second operational amplifier module 122 is the main functional module of the second branch 12. Its main function is to perform signal processing on the second response signal obtained by the second voltage divider protection module 121 to output a corresponding electrical signal. When the original signal is an analog signal, the electrical signal output by the second operational amplifier module 122 is the target analog signal, thereby completing the analog signal acquisition process for the original signal.

[0046] Please continue reading. Figure 3 The second voltage divider protection module 121 includes a third resistor R3, a fourth resistor R4, and a second Zener diode D2. The first end of the third resistor R3 is used to receive the original signal, and the second end of the third resistor R3 is connected to the first end of the fourth resistor R4, the second operational amplifier module 122, and the cathode of the second Zener diode D2. The anode of the second Zener diode D2 is used to ground, and the second end of the fourth resistor R4 is used to ground.

[0047] Specifically, for the specific circuit structure of the second branch 12, please refer to the example provided. Figure 3 The multiple rectangular blocks shown include, for the second voltage divider protection module 121, a third resistor R3, a fourth resistor R4, and a second Zener diode D2. The first end of R3 is connected to the input port IO-IN of the original signal to receive the original signal. The second end of R3 is also connected to the first end of R4, the cathode of D2, and the second operational amplifier module 122. Furthermore, the second end of R4 is grounded, and the anode of D2 is grounded.

[0048] For the third resistor R3, the fourth resistor R4, and the second Zener diode D2 in the second voltage divider protection module 121, the following effect can be achieved by using the connection method in the example above:

[0049] Firstly, the original signal introduced into the second branch 12 is first subjected to voltage division processing using the connection relationship between R3 and R4. The voltage ratio between the second response signal obtained from the voltage division processing and the original signal is adjusted by setting the resistance values ​​of R3 and R4. For example, in... Figure 3 In this configuration, R3 is set to 191kΩ, and R4 to 11kΩ. It should be noted that... Figure 3The values ​​of R3 and R4 shown are only examples. In actual applications, the resistance values ​​of R3 and R4 can be adjusted according to the electrical parameters of the second operational amplifier module 122 or the actual voltage division requirements. The above examples should not be construed as limiting the third resistor R3 and the fourth resistor R4.

[0050] Secondly, the second Zener diode D2 is used to protect the components in the second operational amplifier module 122 and the entire second branch 12. If the original signal voltage is too large, the voltage of the second response signal obtained after voltage division by R3 and R4 may still exceed the maximum limit of the input voltage range of the second operational amplifier module 122. In this case, D2 can be broken down to form a short circuit, thereby directly guiding the signal to ground to protect the second operational amplifier module 122. That is, the critical reverse breakdown voltage of the second Zener diode D2 is related to the maximum limit of the input voltage range of the second operational amplifier module 122, and the specific value of the above-mentioned critical reverse breakdown voltage is fine-tuned according to the actual situation of the components. This application does not make a specific limitation. Under the protection of the second voltage divider protection module 121, the second operational amplifier module 122 can perform calculations based on the second response signal obtained after voltage division to obtain the corresponding target analog signal.

[0051] Please continue reading. Figure 3 In some embodiments, the second operational amplifier module 122 includes a second power supply sub-circuit 1221, a voltage control sub-circuit 1222, and a second operational amplifier U2, wherein the second power supply sub-circuit 1221 is used to supply power to the second operational amplifier U2, and the voltage control sub-circuit 1222 is used to control the voltage of the second response signal to be equal to the voltage of the original signal.

[0052] Furthermore, in some embodiments, the non-inverting input port of the second operational amplifier U2 is connected to the first end of the fourth resistor R4, the positive power supply port of the second operational amplifier U2 is connected to the second power supply sub-circuit 1221, the negative power supply port of the second operational amplifier U2 is grounded, the first end of the voltage control sub-circuit 1222 is connected to the inverting input port of the second operational amplifier U2, the second end of the voltage control sub-circuit 1222 is connected to the output port of the second operational amplifier U2, and the output port of the second operational amplifier U2 outputs the target analog signal.

[0053] Specifically, based on the above implementation method, for the second operational amplifier module 122, please refer to... Figure 3Specifically, it includes three parts: a second power supply sub-circuit 1221, a voltage control sub-circuit 1222, and a second operational amplifier U2. In the above embodiment, the second response signal is introduced into U2 from the non-inverting input port +IN. This can generally be achieved by connecting the first end of the fourth resistor R4 to the non-inverting input port +IN of U2. In addition, the output port OUT of U2 outputs the analog signal Analog-IN corresponding to the second response signal.

[0054] The second power supply sub-circuit 1221 is connected to the positive power supply port +VS of the second operational amplifier U2, and its function is to supply power to U2. In addition, the negative power supply port -VS of the second operational amplifier U2 is grounded, thus forming a power supply loop for the second operational amplifier U2. For the circuit structure of the second power supply sub-circuit 1221, exemplarily, it includes one or more parallel capacitors connected between the external power supply VCC and ground. The capacitance value of the capacitors can be adjusted according to actual conditions. For example… Figure 3 In the example shown, the second power supply sub-circuit 1221 includes a third capacitor C3 and a fourth capacitor C4, where C3 has a capacitance of 100μF and C4 has a capacitance of 10μF. Besides Figure 3 Apart from the example shown, the number of capacitors included in the second power supply sub-circuit 1221 and the capacitance value of each capacitor can be adjusted according to actual conditions, and this application does not impose specific limitations.

[0055] Next, the voltage control circuit 1222 is connected to the inverting input port -IN of the second operational amplifier U2. Its function is to form a voltage follower together with the second operational amplifier U2, ensuring that the analog signal output from the output port OUT of U2 is the same as the voltage VC of the second response signal input to U2. For the circuit structure of the voltage control circuit 1222, please refer to [link to relevant documentation]. Figure 3 For example, the voltage control circuit 1222 includes a seventh resistor R7 and a fifth capacitor C5. For example, the resistance of R7 is 10kΩ and the capacitance of C5 is 100μF. The resistance value of R7 and the capacitance value of C5 are related to the resistance values ​​of the third resistor R3 and the fourth resistor R4 in the second voltage divider protection module 121. The specific values ​​of R3, R4, R7 and C5 can be adjusted according to the actual situation, and this application does not make specific limitations.

[0056] In summary, the original signal enters the second branch 12 via the input port IO-IN. First, the third resistor R3 and the fourth resistor R4 in the second voltage divider protection module 121 perform voltage division to obtain the second response signal, with a voltage of VC. Simultaneously, the second Zener diode D2 protects the second operational amplifier module 122 to prevent VC from exceeding the maximum input voltage range of the second operational amplifier module 122. The second response signal is input from the non-inverting input port +IN of the second operational amplifier U2. The second operational amplifier U2 and the voltage control circuit 1222 form a voltage follower, outputting the corresponding voltage signal Anolog-IN from the output port OUT of the second operational amplifier U2. The voltage of the Anolog-IN voltage signal is equal to the voltage VC of the second response signal. If the original signal is an analog signal, the voltage signal Anolog-IN output from the output port OUT of the second operational amplifier U2 is the target analog signal. Boosting the target analog signal yields the same analog signal as the original signal, thus completing the analog signal acquisition process.

[0057] The electronic device in this application includes the signal acquisition circuit described above.

[0058] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0060] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A signal acquisition circuit, characterized by comprising: The signal acquisition circuit comprises a first branch and a second branch, the first branch is used for determining a target digital signal according to original signal acquisition, and the second branch is used for determining a target analog signal according to the original signal acquisition, wherein the original signal is input from outside the signal acquisition circuit to the signal acquisition circuit.

2. The circuit of claim 1, wherein, The first branch comprises a first voltage division protection module and a first operational amplifier module, the first voltage division protection module is used for processing the original signal into a first response signal, wherein the voltage of the first response signal conforms to the input voltage range of the first operational amplifier module; The first operational amplifier module is configured to determine the target digital signal according to the first response signal.

3. The circuit of claim 2, wherein, The first voltage division protection module comprises a first resistor, a second resistor and a first zener diode, the first end of the first resistor is used for accessing the original signal, the second end of the first resistor is connected to the first end of the second resistor, the first operational amplifier module and the cathode of the first zener diode at the same time, the anode of the first zener diode is used for grounding, and the second end of the second resistor is used for grounding.

4. The circuit of claim 3, wherein, The first operational amplifier module comprises a first power supply sub-circuit, a reference sub-circuit and a first operational amplifier, wherein the first power supply sub-circuit is used for supplying power to the first operational amplifier, the reference sub-circuit is connected to the inverting input port of the first operational amplifier, and the reference sub-circuit is used for providing a reference voltage for determining high and low levels.

5. The circuit of claim 4, wherein, The non-inverting input port of the first operational amplifier is connected to the first end of the second resistor, the positive power supply port of the first operational amplifier is connected to the first power supply sub-circuit, the negative power supply port of the first operational amplifier is used for grounding, and the output port of the first operational amplifier outputs the target digital signal.

6. The circuit of claim 1, wherein, The second branch comprises a second voltage division protection module and a second operational amplifier module, the second voltage division protection module is used for processing the original signal into a second response signal, wherein the voltage of the second response signal conforms to the input voltage range of the second operational amplifier module; The second operational amplifier module is configured to determine the target analog signal according to the second response signal.

7. The circuit of claim 6, wherein, The second voltage division protection module comprises a third resistor, a fourth resistor and a second zener diode, the first end of the third resistor is used for accessing the original signal, the second end of the third resistor is connected to the first end of the fourth resistor, the second operational amplifier module and the cathode of the second zener diode at the same time, the anode of the second zener diode is used for grounding, and the second end of the fourth resistor is used for grounding.

8. The circuit of claim 7, wherein, The second operational amplifier module comprises a second power supply sub-circuit, a voltage control sub-circuit and a second operational amplifier, wherein the second power supply sub-circuit is used for supplying power to the second operational amplifier, and the voltage control sub-circuit is used for controlling the voltage of the second response signal to be equal to the voltage of the original signal.

9. The circuit of claim 8, wherein, The noninverting input port of the second operational amplifier is connected with the first end of the fourth resistor, the positive power supply port of the second operational amplifier is connected with the second power supply subcircuit, the negative power supply port of the second operational amplifier is grounded, the first end of the pressure control subcircuit is connected with the inverting input port of the second operational amplifier, the second end of the pressure control subcircuit is connected with the output port of the second operational amplifier, and the output port of the second operational amplifier outputs the target analog signal.

10. An electronic device, comprising: The electronic device comprises the signal acquisition circuit according to any one of claims 1-9.

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