Analog signal output circuit, processing device and electronic equipment

Abstract

The utility model provides an analog signal output circuit, a processing device and electronic equipment. The analog signal output circuit comprises a first resistor, the first end of which is connected with the analog signal input end; the first input end of the operational amplifier is connected with the second end of the first resistor; the first end of the second resistor is connected with the first input end; the first end of the first switch is connected with the second end of the second resistor, and the second end of the first switch is connected with the analog signal output end; the first end of the third resistor is connected with the second input end of the operational amplifier, and the second end is grounded; the output end of the operational amplifier and the second input end form a feedback loop; the first end of the second switch is connected with the output end of the operational amplifier; the second end of the second switch is connected with the analog signal output end; and the controller is connected with the control ends of the first switch and the second switch and can control the first switch and the second switch to be switched between a voltage mode and a current mode. The device is simple in structure and high in integration level, and reduces channel redundancy, power consumption and cost.

Description

Technical Field

[0001] This utility model generally relates to the field of analog circuit technology, and in particular to an analog signal output circuit, processing device and electronic device. Background Technology

[0002] In industrial communication, analog signal output circuits play a crucial role. However, some existing analog signal output circuits suffer from drawbacks such as channel redundancy, circuit complexity, high power consumption, and high cost. Therefore, there is an urgent need for a new analog signal output circuit to solve these technical problems.

[0003] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Utility Model Content

[0004] To address one or more of the problems existing in the prior art, this utility model provides an analog signal output circuit, comprising:

[0005] A first resistor, the first end of which is connected to the analog signal input terminal;

[0006] An operational amplifier, wherein the first input terminal of the operational amplifier is connected to the second terminal of the first resistor;

[0007] The second resistor has its first end connected to the first input terminal;

[0008] A first switch, the first end of the first switch is connected to the second end of the second resistor, and the second end of the first switch is connected to the analog signal output terminal;

[0009] A third resistor, the first end of which is connected to the second input terminal of the operational amplifier, and the second end of which is grounded; the output terminal of the operational amplifier and the second input terminal form a feedback loop;

[0010] A second switch, the first end of which is connected to the output terminal of the operational amplifier; the second end of which is connected to the analog signal output terminal; and

[0011] The controller is connected to the control terminals of the first switch and the second switch, and can control the on and off of the first switch and the second switch so that the analog signal output circuit switches between voltage mode and current mode.

[0012] Optionally, the first switch is open, the second switch is open, and the analog signal output circuit operates in the voltage mode.

[0013] Optionally, the first switch is turned on, the second switch is turned off, and the analog signal output circuit operates in the current mode.

[0014] Optionally, the analog signal output circuit further includes a fourth resistor, the first end of which is connected to the first end of the third resistor, and the second end of which is connected to the output terminal of the operational amplifier.

[0015] Optionally, the analog signal output circuit further includes a fifth resistor, which is connected in parallel to the first and second terminals of the second switch.

[0016] Optionally, the analog signal output circuit further includes: an extended protection circuit, which is connected to the output terminal of the operational amplifier and the fifth resistor, and the extended protection circuit includes at least one of an overvoltage protection circuit, a current extension circuit, or an overcurrent protection circuit.

[0017] Optionally, the overvoltage protection circuit is connected to the output of the operational amplifier and the fifth resistor.

[0018] Optionally, the overvoltage protection circuit includes a diode, with the anode of the diode connected to the fifth resistor and the cathode connected to the output terminal of the operational amplifier.

[0019] Optionally, the current extension circuit is connected to the output of the operational amplifier and the fifth resistor.

[0020] Optionally, the current extension circuit includes a first transistor, and the extension protection circuit further includes a sixth resistor. The first end of the sixth resistor is connected to the output terminal of the operational amplifier, the second end of the sixth resistor is connected to the base of the first transistor, and the collector of the first transistor is connected to a voltage source.

[0021] Optionally, the overcurrent protection circuit is connected to the current extension circuit and the fifth resistor.

[0022] Optionally, the overcurrent protection circuit includes a seventh resistor and a second transistor. The first end of the seventh resistor is connected to the emitter of the first transistor and the base of the second transistor, and the second end of the seventh resistor is connected to the fifth resistor. The collector of the second transistor is connected to the base of the first transistor, and the emitter of the second transistor is connected to the first end of the second switch.

[0023] Optionally, the analog signal output circuit further includes a gain adjustment circuit, which is connected to the first terminal of the third resistor and the fourth resistor.

[0024] Optionally, the gain adjustment circuit includes an eighth resistor and a third switch. One end of the eighth resistor is connected to the first end of the third switch, and the other end of the eighth resistor is connected to the first end of the third resistor and the fourth resistor. The second end of the third switch is grounded, and the control end of the third switch is connected to the controller.

[0025] Optionally, the first switch, the second switch, and the third switch comprise metal-oxide-semiconductor field-effect transistors.

[0026] Optionally, the first switch includes a first sub-switch and a second sub-switch, with the gate of the first sub-switch connected to the source of the second sub-switch; the third switch includes a third sub-switch and a fourth sub-switch, with the gate of the third sub-switch connected to the source of the fourth sub-switch.

[0027] Optionally, the analog signal output circuit further includes a capacitor connected in parallel with the fourth resistor.

[0028] This utility model also provides a processing device, including the analog signal output circuit described above.

[0029] This invention also provides an electronic device, including the analog signal output circuit described above.

[0030] The analog signal output circuit of this invention supports 0-10V constant voltage output mode and 4-20mA constant current mode for industrial applications. The controller provides control signals to control the on / off state of the first and second switches, so as to switch between voltage mode and current mode. By replacing the power switch with a signal switch, the power requirements and costs are greatly reduced.

[0031] The analog signal output circuit of this invention uses a single operational amplifier for both voltage and current modes. It avoids channel redundancy through a multiplexed feedback loop, resulting in high integration, a simplified structure, reduced circuit complexity, cost savings, and improved reliability.

[0032] The analog signal output circuit of this invention has high versatility and is suitable for various processing devices and electronic equipment.

[0033] By employing the aforementioned analog signal output circuit, the processing device or electronic device of this invention helps to achieve high integration and miniaturization, thereby saving costs and improving reliability. Attached Figure Description

[0034] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This diagram illustrates the architecture of some existing analog signal output circuits.

[0036] Figure 2 A schematic diagram of the overall architecture of an analog signal output circuit according to some embodiments of the present invention is shown.

[0037] Figure 3 A schematic diagram of an analog signal output circuit according to some embodiments of the present invention is shown.

[0038] Figure 4 A schematic diagram of an analog signal output circuit according to some embodiments of the present invention is shown.

[0039] Figure 5 A schematic diagram of an analog signal output circuit according to some embodiments of the present invention is shown.

[0040] Figure 6 A schematic diagram of a processing apparatus according to some embodiments of the present invention is shown.

[0041] Figure 7 A schematic diagram of an electronic device according to some embodiments of the present invention is shown. Detailed Implementation

[0042] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0043] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "coupling" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0046] The following provides many different embodiments or examples for implementing various structures of this invention. To simplify the invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0047] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0048] Figure 1 This shows schematic diagrams of the architectures of some existing analog signal output circuits. For example... Figure 1 As shown, the analog signal output circuit includes a controller, operational amplifier, feedback loop, and analog switch. In voltage and current modes, the analog signal output circuit operates using two independent analog circuits (each using its own operational amplifier and feedback loop), with power switching performed on the output side. This architecture always results in one analog circuit being idle, leading to channel redundancy, circuit complexity, high power consumption, and high cost.

[0049] Figure 2 A schematic diagram of the overall architecture of an analog signal output circuit according to some embodiments of the present invention is shown. Figure 2 As shown, the analog signal output circuit of this invention shares a single analog circuit for both voltage and current modes. This analog circuit includes an operational amplifier and a switch matrix composed of multiple switches. Compared with traditional technical solutions, it has a simpler structure, higher integration, reduced channel redundancy, and lower circuit complexity, power consumption, and cost. A detailed description follows.

[0050] Figure 3 A schematic diagram of an analog signal output circuit 10 according to some embodiments of the present invention is shown. For example... Figure 3 As shown, the analog signal output circuit 10 includes an analog signal input terminal INPUT, an analog signal output terminal OUTPUT, an operational amplifier OPA, a first resistor R1, a second resistor R2, a third resistor R3, a first switch Q1, a second switch Q2, and a controller. Figure 3 (Not shown). The first terminal of the first resistor R1 is connected to the analog signal input terminal INPUT. The second terminal of the first resistor R1 is connected to the first input terminal of the operational amplifier OPA (e.g., Figure 3 (Illustrated positive input terminal). The first terminal of the second resistor R2 is connected to the first input terminal of the operational amplifier OPA (e.g., Figure 3 The schematic positive input terminal) and the second terminal of the first resistor R1. The second terminal of the second resistor R2 is connected to the first terminal of the first switch Q1, and the second terminal of the first switch Q1 is connected to the analog signal output terminal OUTPUT. The first terminal of the third resistor R3 is connected to the second input terminal of the operational amplifier OPA (e.g., the positive input terminal). Figure 3 (Illustrated negative input terminal). The second terminal of the third resistor R3 is grounded. The output terminal of the operational amplifier OPA forms a feedback loop with the second input terminal (e.g., Figure 3 (Illustrative negative feedback loop). In some embodiments, the analog signal output circuit 10 further includes a fourth resistor R4. The first end of the fourth resistor R4 is connected to the first end of the third resistor R3, and the second end of the fourth resistor R4 is connected to the output terminal OUT of the operational amplifier OPA. The first end of the second switch Q2 is connected to the output terminal OUT of the operational amplifier OPA. The second end of the second switch Q2 is connected to the analog signal output terminal OUTPUT. In some embodiments, the analog signal output circuit 10 further includes a fifth resistor R5. The fifth resistor R5 is connected in parallel to the first and second ends of the second switch Q2. The controller is connected to the control terminals of the first switch Q1 and the second switch Q2 (e.g., ...). Figure 3 The schematic enable terminals EN1 and EN2 can control the on / off state of the first switch Q1 and the second switch Q2, so that the analog signal output circuit 10 switches between voltage mode (CVMODE) and current mode (CCMODE).

[0051] In some embodiments, such as Figure 3 As shown, the first switch Q1 is open, the second switch Q2 is open, and the analog signal output circuit 10 operates in voltage mode (CV MODE). In voltage mode, the analog signal output circuit 10 supports a constant voltage output of 0–10V. In voltage mode, the analog voltage signal is output through the operational amplifier OPA and flows through the second switch Q2 to the signal output terminal OUTPUT. In voltage mode, the analog signal output circuit 10 supports negative feedback. The analog voltage signal is fed back from the signal output terminal OUTPUT through the second switch Q2 and the fourth resistor R4 to the second input terminal (e.g., the negative input terminal) of the operational amplifier OPA. In voltage mode, the output voltage of the analog signal output circuit 10 depends only on the analog input voltage.

[0052] In some embodiments, such as Figure 3 As shown, the first switch Q1 is on, the second switch Q2 is off, and the analog signal output circuit 10 operates in current mode (CC MODE). In current mode, the analog signal output circuit 10 supports a constant current output of 4–20 mA. In current mode, the analog current signal is output from the signal output terminal OUTPUT via the first resistor R1, the second resistor R2, and the first switch Q1. In current mode, the analog signal output circuit 10 supports positive feedback. The analog current signal is fed back from the signal output terminal OUTPUT through the first switch Q1 and the second resistor R2 to the first input terminal (e.g., the positive input terminal) of the operational amplifier OPA. The fifth resistor R5 acts as a shunt resistor. During positive feedback, the analog current signal is shunted by the fifth resistor R5, making the output current of the analog signal output circuit 10 dependent on the input voltage.

[0053] In some embodiments, the controller may include control circuitry, a central processing unit (CPU), a micro control unit (MCU), a digital signal processor (DSP), other general-purpose processors, application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), complex programmable logic devices (CPLDs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and other components or circuits.

[0054] In some embodiments, the first switch Q1 / second switch Q2 / third switch Q3 may include a metal-oxide-semiconductor field-effect transistor (MOSFET). The MOSFET may be a P-channel metal-oxide-semiconductor field-effect transistor (PMOS). Alternatively, the MOSFET may be an N-channel metal-oxide-semiconductor field-effect transistor (NMOS). The MOSFET may employ a multiplexer integrated with a J-type field-effect transistor (JFET).

[0055] In some embodiments, the first switch Q1 / second switch Q2 / third switch Q3 may include any switching device that can perform an equivalent or similar function, such as a bipolar junction transistor (BJT), a relay, a silicon controlled rectifier (SCR), a potentiometer, or a mechanical switch. In practical applications, the specific configuration can be determined according to requirements.

[0056] In some embodiments, such as Figure 3 As shown, the first switch Q1 includes a first sub-switch Q11 and a second sub-switch Q12. Both the first sub-switch Q11 and the second sub-switch Q12 can be MOSFETs. The gate of the first sub-switch Q11 is connected to the source of the second sub-switch Q12, i.e., back-to-back. The gates (i.e., control terminals) of the first sub-switch Q11 and the second sub-switch Q12 are connected to a controller. The controller can control the on / off state of the first sub-switch Q11 and the second sub-switch Q12 to achieve unidirectional or bidirectional control.

[0057] In some embodiments, the analog signal output circuit 10 further includes an extended protection circuit 11. Figure 4 A schematic diagram of an analog signal output circuit 10 according to some embodiments of the present invention is shown. For example... Figure 4 As shown, the extended protection circuit 11 is connected to the output terminal of the operational amplifier OPA and the fifth resistor R5 (or the first terminal of the second switch Q2). The extended protection circuit 11 includes at least one of the following: overvoltage protection circuit 110, current extension circuit 120, or overcurrent protection circuit 130.

[0058] In some embodiments, such as Figure 4As shown, the overvoltage protection circuit 110 is connected to the output terminal of the operational amplifier OPA and the fifth resistor R5 (or the first terminal of the second switch Q2). The overvoltage protection circuit 110 is used to implement overvoltage protection. Exemplarily, the overvoltage protection circuit 110 may include one or more devices or circuits such as diodes and step-down resistors.

[0059] In some embodiments, such as Figure 4 As shown, the current expansion circuit 120 connects the output terminal of the operational amplifier OPA to the fifth resistor R5 (or the first terminal of the second switch Q2). The current expansion circuit 120 is used to amplify the current. Exemplarily, the current expansion circuit 120 may include one or more amplifying devices or circuits such as transistors or MOSFETs.

[0060] In some embodiments, such as Figure 4 As shown, the overcurrent protection circuit 130 is connected to the current extension circuit 120 and the fifth resistor R5 (or the first terminal of the second switch Q2). The overcurrent protection circuit 130 can protect the circuit from overcurrent damage. Exemplarily, the overcurrent protection circuit 130 may include one or more devices or circuits such as transistors, MOSFETs, and step-down resistors.

[0061] Figure 5 A schematic diagram of an analog signal output circuit 10 according to some embodiments of the present invention is shown. For example... Figure 5 As shown, the overvoltage protection circuit 110 includes a diode D1. The anode of diode D1 is connected to the fifth resistor R5 (or the first terminal of the second switch Q2), and the cathode is connected to the output terminal of the operational amplifier OPA. When the voltage at the anode of diode D1 is high (e.g., above the voltage threshold), diode D1 conducts, causing the voltage to leak from the operational amplifier OPA. In other words, if the output voltage of the analog signal output circuit 10 is greater than the voltage threshold, diode D1 helps to absorb the voltage. It should be understood that the overvoltage protection circuit 110 can also use active devices such as transistors or MOSFETs to leak these overvoltages.

[0062] In some embodiments, such as Figure 5 As shown, the current expansion circuit 120 includes a first transistor K1. The expansion protection circuit 11 also includes a sixth resistor R6. The first terminal of the sixth resistor R6 is connected to the output terminal of the operational amplifier OPA, and the second terminal of the sixth resistor R6 is connected to the base of the first transistor K1. The collector of the first transistor K1 is connected to a voltage source P (e.g., 24V). The emitter of the first transistor K1 is connected to a seventh resistor R7. The output signal of the operational amplifier OPA can be amplified by the first transistor K1 via the sixth resistor R6, thereby achieving current expansion.

[0063] In some embodiments, such as Figure 5As shown, the overcurrent protection circuit 130 includes a seventh resistor R7 and a second transistor K2. The first terminal of the seventh resistor R7 is connected to the emitter of the first transistor K1 and the base of the second transistor K2, and the second terminal of the seventh resistor R7 is connected to a fifth resistor R5. The collector of the second transistor K2 is connected to the base of the first transistor K1, and the emitter of the second transistor K2 is connected to the first terminal of the second switch Q2. If the output current of the analog signal output circuit 10 exceeds the current threshold (overload or short circuit), the second transistor K2 conducts, and the first transistor K1 is turned off, causing the current expansion circuit 120 to stop expanding the current, preventing overcurrent damage, and thus achieving overcurrent protection. It can be understood that when the output current of the analog signal output circuit 10 exceeds the current threshold (overload or short circuit), the diode D1 can also conduct to absorb current, which helps assist the operation of the overcurrent protection circuit 130.

[0064] In some embodiments, the analog signal output circuit 10 further includes a gain adjustment circuit 12. For example... Figure 4 As shown, the gain adjustment circuit 12 is connected to the first terminal of the third resistor R3 and the fourth resistor R4.

[0065] In some embodiments, such as Figure 5 As shown, the gain adjustment circuit 12 includes an eighth resistor R8 and a third switch Q3. One end of the eighth resistor R8 is connected to the first terminal of the third switch Q3, and the other end of the eighth resistor R8 is connected to the first terminals of the third resistor R3 and the fourth resistor R4. The second terminal of the third switch Q3 is grounded. The control terminal of the third switch Q3 (e.g., Figure 5 The enable terminal EN3 (illustrated) is connected to the controller. The controller can control the on / off state of the third switch Q3, change the voltage division ratio of the third resistor R3 and the fourth resistor R4, so that the analog signal output circuit 10 has different gains, which helps the analog signal output circuit 10 to normalize the input characteristics.

[0066] In some embodiments, such as Figure 5 As shown, the third switch Q3 includes a third sub-switch Q33 and a fourth sub-switch Q34. Both the third sub-switch Q33 and the fourth sub-switch Q34 can be MOSFETs. The gate of the third sub-switch Q33 is connected to the source of the fourth sub-switch Q34, i.e., back-to-back. The gates (i.e., control terminals) of the third sub-switch Q33 and the fourth sub-switch Q34 are connected to a controller. The controller can control the on / off state of the third sub-switch Q33 and the fourth sub-switch Q34 to achieve unidirectional or bidirectional control, thereby realizing gain adjustment.

[0067] In some embodiments, such as Figure 5 As shown, the analog signal output circuit 10 also includes a capacitor C connected in parallel with the fourth resistor R4. The capacitor C helps to compensate for the distributed capacitance introduced by the third switch Q3 and the eighth resistor R8, which helps to improve circuit stability and signal transmission quality.

[0068] It should be noted that, Figure 5 The implementation of the overvoltage protection circuit 110, the current extension circuit 120, the overcurrent protection circuit 130, and the gain adjustment circuit 12 is illustrated by way of example. This utility model is not limited to this. In practical applications, adjustments can be made according to requirements, and all of these are within the protection scope of this utility model.

[0069] This invention relates to an analog signal output circuit that supports 0-10V constant voltage output mode and 4-20mA constant current mode for industrial applications. A controller provides control signals to control the on / off state of the first and second switches, enabling switching between voltage and current modes. Using signal switches instead of power switches significantly reduces power requirements and cost.

[0070] The analog signal output circuit of this invention uses a single operational amplifier for both voltage and current modes. It avoids channel redundancy through a multiplexed feedback loop, resulting in high integration, a simplified structure, reduced circuit complexity, cost savings, and improved reliability.

[0071] The analog signal output circuit of this invention has high versatility and is suitable for various processing devices and electronic equipment.

[0072] This utility model also provides a processing device. Figure 6 A schematic diagram of a processing apparatus 20 according to some embodiments of the present invention is shown. For example... Figure 6 As shown, the processing device 20 includes the analog signal output circuit 10 as described above. Although not shown in the figure, it can be understood that the processing device 20 may include components such as a housing.

[0073] This utility model also provides an electronic device. Figure 7 A schematic diagram of an electronic device 30 according to some embodiments of the present invention is shown. For example... Figure 7 As shown, the electronic device 30 includes the analog signal output circuit 10 described above. Although not shown in the figure, it can be understood that the electronic device 30 may include components such as a housing. The analog signal output circuit 10 of this invention is highly versatile and can be applied to various electronic devices. This invention does not limit the type of electronic device 20. For example, the electronic device 20 may include various electronic devices such as frequency converters, motors, and PLC products.

[0074] By employing the aforementioned analog signal output circuit, the processing device or electronic device of this invention helps to achieve high integration and miniaturization, thereby saving costs and improving reliability.

[0075] It should be noted that although several modules of the analog signal output circuit / processing device / electronic device are mentioned in the detailed description above, this division is not mandatory. In fact, according to the embodiments of this utility model, the features and functions of two or more modules described above can be implemented in one module. Conversely, the features and functions of one module described above can be further divided and specified by multiple modules.

[0076] It should be noted that this utility model may only include Figure 1-7 Any one or more features of any one or more embodiments. In other words, not all of the shown features need to be implemented simultaneously in the analog signal output circuit / processing device / electronic device of this invention.

[0077] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An analog signal output circuit, characterized by comprising: include: A first resistor, the first end of which is connected to the analog signal input terminal; An operational amplifier, wherein the first input terminal of the operational amplifier is connected to the second terminal of the first resistor; The second resistor has its first end connected to the first input terminal; A first switch, the first end of the first switch is connected to the second end of the second resistor, and the second end of the first switch is connected to the analog signal output terminal; A third resistor, the first end of which is connected to the second input terminal of the operational amplifier, and the second end of which is grounded; the output terminal of the operational amplifier and the second input terminal form a feedback loop; A second switch, the first end of which is connected to the output terminal of the operational amplifier; the second end of which is connected to the analog signal output terminal. and The controller is connected to the control terminals of the first switch and the second switch, and can control the on and off of the first switch and the second switch so that the analog signal output circuit switches between voltage mode and current mode.

2. The analog signal output circuit according to claim 1, characterized by When the first switch is open and the second switch is open, the analog signal output circuit operates in the voltage mode.

3. The analog signal output circuit according to claim 1, characterized by When the first switch is turned on and the second switch is turned off, the analog signal output circuit operates in the current mode.

4. The analog signal output circuit of claim 1, wherein Also includes: A fourth resistor, the first end of which is connected to the first end of the third resistor, and the second end of which is connected to the output of the operational amplifier.

5. The analog signal output circuit of claim 1, wherein Also includes: The fifth resistor is connected in parallel to the first and second terminals of the second switch.

6. The analog signal output circuit according to any one of claims 1 to 5, characterized by, Also includes: An extended protection circuit is provided, which is connected to the output of the operational amplifier and the fifth resistor. The extended protection circuit includes at least one of an overvoltage protection circuit, a current extension circuit, or an overcurrent protection circuit.

7. The analog signal output circuit according to claim 6, characterized by The overvoltage protection circuit is connected to the output of the operational amplifier and the fifth resistor.

8. The analog signal output circuit according to claim 7, characterized by The overvoltage protection circuit includes a diode, with the positive terminal of the diode connected to the fifth resistor and the negative terminal connected to the output terminal of the operational amplifier.

9. The analog signal output circuit of claim 6, wherein, The current extension circuit is connected to the output of the operational amplifier and the fifth resistor.

10. The analog signal output circuit according to claim 9, characterized by The current extension circuit includes a first transistor, and the extension protection circuit also includes a sixth resistor. The first end of the sixth resistor is connected to the output terminal of the operational amplifier, and the second end of the sixth resistor is connected to the base of the first transistor. The collector of the first transistor is connected to a voltage source.

11. The analog signal output circuit according to claim 10, characterized by The overcurrent protection circuit is connected to the current extension circuit and the fifth resistor.

12. The analog signal output circuit of claim 11, wherein, The overcurrent protection circuit includes a seventh resistor and a second transistor. The first end of the seventh resistor is connected to the emitter of the first transistor and the base of the second transistor, and the second end of the seventh resistor is connected to the fifth resistor. The collector of the second transistor is connected to the base of the first transistor, and the emitter of the second transistor is connected to the first end of the second switch.

13. The analog signal output circuit according to any one of claims 1 to 5, characterized by, Also includes: A gain adjustment circuit, wherein the gain adjustment circuit is connected to the first terminal of the third resistor and the fourth resistor.

14. The analog signal output circuit of claim 13, wherein, The gain adjustment circuit includes an eighth resistor and a third switch. One end of the eighth resistor is connected to the first end of the third switch, and the other end of the eighth resistor is connected to the first end of the third resistor and the fourth resistor. The second end of the third switch is grounded, and the control end of the third switch is connected to the controller.

15. The analog signal output circuit of claim 14, wherein, The first switch, the second switch, and the third switch comprise metal-oxide-semiconductor field-effect transistors.

16. The analog signal output circuit of claim 15, wherein, The first switch includes a first sub-switch and a second sub-switch, with the gate of the first sub-switch connected to the source of the second sub-switch; the third switch includes a third sub-switch and a fourth sub-switch, with the gate of the third sub-switch connected to the source of the fourth sub-switch.

17. The analog signal output circuit of claim 14, wherein, It also includes a capacitor connected in parallel with the fourth resistor.

18. A processing device, comprising: Includes the analog signal output circuit as described in any one of claims 1-17.

19. An electronic device, comprising: Includes the analog signal output circuit as described in any one of claims 1-17.

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