Circuit board and electrocardiogram recorder

Abstract

The utility model discloses a circuit board and an electrocardiogram recorder, and belongs to the technical field of medical instruments. The circuit board comprises a substrate, an interface module, a digital module and an analog module, wherein the substrate comprises a first conductive layer, a second conductive layer, a third conductive layer and a fourth conductive layer which are stacked; wherein the second conductive layer serves as a power supply layer, and the third conductive layer serves as a ground layer; the third conductive layer comprises a digital ground and an analog ground which are arranged in an isolated manner; the interface module comprises a data interface; the data interface is arranged on the first conducting layer and used for being connected with an electrocardio electrode of an electrocardio recorder; the simulation module comprises an anti-interference circuit and an acquisition circuit which are arranged on the fourth conductive layer, and the anti-interference circuit is connected with the data interface and the acquisition circuit. The digital module comprises a controller minimum system; the controller minimum system is arranged on the first conductive layer, and the acquisition circuit is connected with the controller minimum system. According to the technical scheme of the utility model, the anti-interference performance of the circuit board can be improved, and the miniaturization of the circuit board is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a circuit board and an electrocardiogram recorder. Background Art

[0002] With the progress of technology, electrocardiogram monitoring by an electrocardiogram recorder is particularly important for people who need to monitor their heart health conditions for a long time.

[0003] At present, due to volume limitations, an electrocardiogram recorder needs to integrate analog circuits and digital circuits in a relatively small volume space, and the electrocardiogram recorder collects and records weak analog voltage signals generated by the human body. Therefore, the miniaturization of the electrocardiogram recorder and the improvement of its anti-interference performance have become urgent problems to be solved. Summary of the Utility Model

[0004] The utility model provides a circuit board and an electrocardiogram recorder to improve the anti-interference performance of the circuit board and realize the miniaturization of the circuit board.

[0005] According to one aspect of the utility model, a circuit board is provided, which is applied to an electrocardiogram recorder. The circuit board includes:

[0006] A substrate, including: a first conductive layer, a second conductive layer, a third conductive layer, and a fourth conductive layer which are stacked; wherein, the second conductive layer serves as a power supply layer, and the third conductive layer serves as a ground layer; the third conductive layer includes a digital ground and an analog ground which are isolated from each other;

[0007] An interface module, including: a data interface; the data interface is arranged on the first conductive layer and is used for connecting an electrocardiogram electrode of the electrocardiogram recorder;

[0008] An analog module, powered from the second conductive layer and grounded through the analog ground; the analog module includes: an anti-interference circuit and a collection circuit; both the anti-interference circuit and the collection circuit are arranged on the fourth conductive layer, and the anti-interference circuit is respectively connected to the data interface and the collection circuit;

[0009] A digital module, powered from the second conductive layer and grounded through the digital ground; the digital module includes: a controller minimum system; the controller minimum system is arranged on the first conductive layer, and the collection circuit is connected to the controller minimum system.

[0010] Optionally, the analog module further includes: a pacing circuit, arranged on the fourth conductive layer and connected to the collection circuit; the collection circuit includes a collection chip and its peripheral circuits;

[0011] Among them, the peripheral circuit of the acquisition chip, the pacing circuit, and the anti-interference circuit are arranged around the acquisition chip; the anti-interference circuit and the acquisition chip are arranged in sequence along the first direction; along the first direction, the acquisition chip and the pacing circuit are arranged on the same side of the anti-interference circuit; the acquisition chip and the pacing circuit are arranged in sequence along the second direction; the first direction and the second direction intersect.

[0012] Optionally, the digital module further includes: a clock circuit, arranged on the fourth conductive layer and connected to the controller minimum system; wherein, along the first direction, the clock circuit is arranged on the side of the acquisition circuit away from the anti-interference circuit.

[0013] Optionally, the first conductive layer includes a first side and a second side arranged opposite to each other along the first direction, and a third side and a fourth side arranged opposite to each other along the second direction; the data interface is arranged close to the second side, and the controller minimum system is arranged close to the third side; the first direction intersects with the second direction.

[0014] Optionally, the digital module further includes: a storage circuit and a drive circuit; both the storage circuit and the drive circuit are arranged on the first conductive layer, and the storage circuit is respectively connected to the controller minimum system and the drive circuit;

[0015] Among them, both the storage circuit and the drive circuit are arranged close to the fourth side; the storage circuit, the drive circuit, and the data interface are arranged in sequence along the first direction; the controller minimum system and the storage circuit are arranged in sequence along the second direction.

[0016] Optionally, the circuit board further includes: a radio frequency antenna, arranged on the first conductive layer and connected to the controller minimum system; wherein, the radio frequency antenna is arranged close to the first side and the third side; the radio frequency antenna, the controller minimum system, and the data interface are arranged in sequence along the first direction.

[0017] Optionally, the interface module further includes: a debugging interface, arranged on the first conductive layer and connected to the controller minimum system; wherein, the debugging interface is arranged close to the first side.

[0018] Optionally, the second conductive layer includes an analog power supply area and a digital power supply area which are isolated; the analog module draws power from the analog power supply area, and the digital module draws power from the digital power supply area;

[0019] The circuit board further includes:

[0020] A digital power supply circuit, arranged on the first conductive layer and connected to the digital power supply area;

[0021] An analog power supply circuit, disposed on the fourth conductive layer and connected to the analog power supply area.

[0022] Optionally, the circuit board is a rectangular board; the size of the circuit board is 20mm * 37mm.

[0023] According to another aspect of the present invention, a electrocardiogram recorder is provided, including an electrocardiogram electrode and the circuit board provided in any of the above embodiments.

[0024] The technical solution of the embodiment of the present invention, by providing a complete power layer and a ground layer, the power layer can provide a stable power plane, effectively distribute the power to each circuit element on the circuit board, thereby reducing voltage noise and fluctuations, and improving the stability and performance of the circuit. The ground layer can be used as the ground reference layer of the circuit, effectively absorbing and dispersing electromagnetic noise, reducing the influence of electromagnetic interference on the circuit, and helping to improve the anti-interference ability of the circuit. And by isolating the ground layer into a digital ground and an analog ground, it is possible to reduce interference and noise in the circuit, which is beneficial to maintaining signal integrity, and can improve the stability and performance of the circuit, and can ensure a short signal return path. By arranging some components of the interface module, the analog module and the digital module on the first conductive layer and some components on the fourth conductive layer, the circuit board can be made more compact on the premise of realizing the functions of the electrocardiogram recorder, and the miniaturization of the electrocardiogram recorder can be realized. By setting an anti-interference circuit, and the anti-interference circuit and the acquisition circuit are arranged on the same conductive layer, the signal-to-noise ratio of the acquired signal can be improved, and further the accuracy and stability of the signal acquired by the electrocardiogram recorder can be ensured.

[0025] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 A schematic structural diagram of a circuit board provided by an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of a film layer of a circuit board provided by an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of a fourth conductive layer provided by an embodiment of the present utility model;

[0030] Figure 4 Schematic diagram of a first conductive layer provided by an embodiment of the present utility model. Detailed implementation manners

[0031] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and their variants are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0033] An embodiment of the present utility model provides a circuit board, which can be applied to an electrocardiograph recorder. Figure 1 Schematic diagram of a circuit board provided by an embodiment of the present utility model; Figure 2 Schematic diagram of a film layer of a circuit board provided by an embodiment of the present utility model; Figure 3 Schematic diagram of a fourth conductive layer provided by an embodiment of the present utility model; Figure 4 Schematic diagram of a first conductive layer provided by an embodiment of the present utility model. Among them, Figure 1 is a structural block diagram of the circuit board, Figures 2 - 4 is Figure 1 the circuit board film layer diagram and the corresponding actual component layout diagram of the circuit board corresponding to the structural block diagram of the circuit board. Refer to Figures 1 - 4 The circuit board includes: a substrate, an interface module 10, an analog module 20, and a digital module 30.

[0034] Among them, the substrate includes a first conductive layer 111, a second conductive layer 112, a third conductive layer 113, and a fourth conductive layer 114 which are stacked; among them, the first conductive layer 111 serves as the top component layer, the second conductive layer 112 serves as the power supply layer, the third conductive layer 113 serves as the ground layer, and the fourth conductive layer 114 serves as the bottom component layer, that is, the substrate is configured as a four-layer board; the third conductive layer 113 includes a digital ground and an analog ground which are isolated. The interface module 10 includes a data interface 101; the data interface 101 is disposed on the first conductive layer 111 and is used to connect the ECG electrodes 200 of the ECG recorder. The analog module 20 draws power from the second conductive layer 112 and is grounded through the analog ground; the analog module 20 includes an anti-interference circuit 201 and a collection circuit 202; both the anti-interference circuit 201 and the collection circuit 202 are disposed on the fourth conductive layer 114, and the anti-interference circuit 201 is respectively connected to the data interface 101 and the collection circuit 202. The digital module 30 draws power from the second conductive layer 112 and is grounded through the digital ground; the digital module 30 includes a controller minimum system 301; the controller minimum system 301 is disposed on the first conductive layer 111, and the collection circuit 202 is connected to the controller minimum system 301.

[0035] Specifically, the first conductive layer 111 further includes relevant connection traces (not shown in the figure) disposed between the components on the first conductive layer 111, and the fourth conductive layer 114 further includes relevant connection traces (not shown in the figure) disposed between the components on the fourth conductive layer 114. The data interface 101 can be specifically understood as an interface related to data transmission such as data acquisition and data playback, for example, a type-c interface or a USB interface. The anti-interference circuit 201 is used to filter out the interference signals in the input signal of the data interface 101, thereby ensuring the accuracy and stability of the signal input to the collection circuit 202. The anti-interference circuit 201 may include, for example, capacitors, resistors, and discharge tubes. The collection circuit 202 can be used to convert the collected ECG signals into signals that the controller minimum system 301 can recognize, for example, including a collection chip, capacitors, and resistors. The controller minimum system 301, as the core processing component in the circuit board, can be considered as a collection of a controller chip (such as a microprocessor or a microcontroller) and its minimum peripheral circuits and components required for basic operation.

[0036] Exemplarily, the basic working principle of this circuit board can be understood as follows: when the data interface 101 is connected to the ECG electrodes 200 of the ECG recorder, the signal input through the data interface 101 is first filtered by the anti-interference circuit 201 to filter out the interference signals, thereby making the signal collection by the collection circuit 202 more accurate and stable. Further, the collection circuit 202 inputs the collected ECG signals to the controller minimum system 301 so that the controller minimum system 301 can perform data processing on the input signals.

[0037] In the technical solution of the embodiment of the present utility model, by providing a complete power layer and a ground layer, the power layer can provide a stable power plane, effectively distribute the power to each circuit element on the circuit board, thereby reducing voltage noise and fluctuations, and improving the stability and performance of the circuit. The ground layer can be used as the ground reference layer of the circuit, effectively absorbing and dispersing electromagnetic noise, reducing the impact of electromagnetic interference on the circuit, and helping to improve the anti-interference ability of the circuit. And by isolating the ground layer into a digital ground and an analog ground, it is possible to reduce interference and noise in the circuit, which is beneficial to maintaining signal integrity, and can improve the stability and performance of the circuit, and can ensure a short signal return path. By arranging some components of the interface module 10, the analog module 20 and the digital module 30 on the first conductive layer 111 and some components on the fourth conductive layer 114, the circuit board can be made more compact on the premise of realizing the function of the electrocardiograph recorder, and the miniaturization of the electrocardiograph recorder can be achieved. By providing the anti-interference circuit 201, and the anti-interference circuit 201 and the acquisition circuit 202 are arranged on the same conductive layer, the signal-to-noise ratio of the acquired signal can be improved, and further the accuracy and stability of the signal acquired by the electrocardiograph recorder can be ensured.

[0038] It should be noted that, in order to clearly show the connection relationship and the set position relationship of the circuit devices, in the drawings of the embodiment of the present utility model, some connection pads or terminals of the circuit devices are used to represent the circuit devices. Those skilled in the art can understand that on the final PCB board, the circuit devices can be connected to the corresponding pads in the figure.

[0039] Next, the specific structure that the circuit board may have will be described.

[0040] Continue to refer to Figure 3 , in one embodiment, optionally, the analog module 20 further includes: a pacing circuit 203, arranged on the fourth conductive layer 114 and connected to the acquisition circuit 202; the acquisition circuit 202 includes an acquisition chip U1 and its peripheral circuits; wherein, the peripheral circuits of the acquisition chip U1, the pacing circuit 203 and the anti-interference circuit 201 are arranged around the acquisition chip U1; the anti-interference circuit 201 and the acquisition chip U1 are arranged in sequence along the first direction X; along the first direction X, the acquisition chip U1 and the pacing circuit 203 are arranged on the same side of the anti-interference circuit 201; the acquisition chip U1 and the pacing circuit 203 are arranged in sequence along the second direction Y; the first direction X and the second direction Y intersect. Exemplarily, the first direction X is perpendicular to the second direction Y.

[0041] Among them, the peripheral circuit of the acquisition chip U1 can exemplarily include capacitors and resistors. Any existing acquisition circuit can be used to implement the acquisition function, and specific limitations are not made here. The pacing circuit 203 includes a pacing chip U2 and its peripheral circuit. The peripheral circuit of the pacing chip U2 can exemplarily include capacitors and resistors. Any existing pacing circuit can be used to implement the function of acquiring the pacemaker signal, and specific limitations are not made here.

[0042] Specifically, the signal transmitted through the data interface 101 can include signals related to the pacemaker. When there are signals related to the pacemaker in the signals acquired by the acquisition circuit 202, the relevant signals can be obtained by the pacing circuit 203 by acquiring the conventional signals acquired by the acquisition circuit 202 and performing calculations. By setting the pacing circuit 203, various scenario requirements can be adapted.

[0043] Continue to refer to Figure 3 , in another embodiment, optionally, the digital module 30 further includes: a clock circuit 302, disposed on the fourth conductive layer 114 and connected to the controller minimum system 301; wherein, along the first direction X, the clock circuit 302 is disposed on a side of the acquisition circuit 202 away from the anti-interference circuit 201.

[0044] Among them, the clock circuit 302 includes a clock chip U3 and its peripheral circuit, and a battery BAT; the peripheral circuit of the clock chip U3 can exemplarily include resistors and capacitors. Any existing clock circuit can be used to implement the function of maintaining time accuracy, and specific limitations are not made here.

[0045] Specifically, when the circuit board is working properly, the clock circuit 302 is powered by the battery BAT to work properly, and thus the accuracy of time during the acquisition of the electrocardiogram signal can be maintained.

[0046] Continue to refer to Figure 4 , in another embodiment, optionally, the first conductive layer 111 includes a first side 121 and a second side 122 oppositely disposed along the first direction X, and a third side 123 and a fourth side 124 oppositely disposed along the second direction Y; the data interface 101 is disposed close to the second side 122, and the controller minimum system 301 is disposed close to the third side 123; the first direction X intersects the second direction Y.

[0047] Specifically, the data interface 101 can include a common data interface. For example, it can be a Type-c type interface, which is convenient to use. By disposing the data interface 101 close to the second side 122 and the controller minimum system 301 close to the third side 123, electromagnetic interference can be reduced, the signal transmission path can be optimized, cross-interference can be prevented, and the spatial layout and design of the circuit board can be optimized, thereby improving the stability, performance, and electromagnetic compatibility of the system.

[0048] Continue to refer to Figure 4 In another embodiment, optionally, the digital module 30 further includes: a storage circuit 303 and a driving circuit 304; both the storage circuit 303 and the driving circuit 304 are disposed on the first conductive layer 111, and the storage circuit 303 is respectively connected to the controller minimum system 301 and the driving circuit 304; wherein, both the storage circuit 303 and the driving circuit 304 are disposed close to the fourth side 124; the storage circuit 303, the driving circuit 304, and the data interface 101 are arranged in sequence along the first direction X; the controller minimum system 301 and the storage circuit 303 are arranged in sequence along the second direction Y.

[0049] Optionally, the storage circuit 303 further includes a storage chip U8 and its peripheral circuit.

[0050] Among them, the peripheral circuit of the storage chip U8 may exemplarily include resistors and capacitors, and the function of storing data can be implemented by using existing and arbitrary storage chips and their peripheral circuits, and specific limitations are not made here. The peripheral circuit of the driving circuit 304 may exemplarily include resistors and capacitors, and the function of driving can be implemented by using existing and arbitrary driving circuits, and specific limitations are not made here.

[0051] Specifically, the storage circuit 303 is used to store the collected electrocardiogram signals processed by the controller minimum system 301. The driving circuit 304 includes a first driving chip U4 and its peripheral circuit, and a second driving chip U5 and its peripheral circuit. Among them, the first driving chip U4 can be used as a switching circuit, and the second driving chip U5 can be used for data format conversion. When the data interface 101 is connected to an external device (for example, a computer), and the interface type of the data interface 101 is different from the interface type of the external device connected to the circuit board, the first driving chip U4 can be turned on to enable the second driving chip U5 to perform data format conversion. Exemplarily, the data interface 101 is a Type-c interface, and the connection interface of the external device is a USB interface. When the data interface 101 is connected to the external device, the first driving chip U4 is turned on so that the internal data of the storage chip U8 can be read through the external device. The second driving chip U5 can be specifically understood as a Type-c to USB serial port chip, which is used to convert to the same communication protocol as the storage chip U8, so as to read the internal data of the storage chip U8. By setting the driving circuit 304, the first driving chip U4 can play a switching role, so that when connected to an external device, the driving circuit 304 is turned on and data format conversion is performed, which can reduce the system power consumption.

[0052] Continue to refer to Figure 4, in another embodiment, optionally, the circuit board further includes: a radio frequency antenna 60, disposed on the first conductive layer 111 and connected to the controller minimum system 301; wherein, the radio frequency antenna 60 is disposed close to the first side 121 and the third side 123; the radio frequency antenna 60, the controller minimum system 301, and the data interface 101 are arranged in sequence along the first direction X.

[0053] Wherein, the signal output by the radio frequency antenna 60 is an analog signal, and the radio frequency antenna 60 can convert the radio frequency signal generated by the controller minimum system 301 into an electromagnetic wave for transmission, so that the circuit board can perform wireless communication with mobile phones and other devices.

[0054] Specifically, the radio frequency antenna 60 is disposed close to the controller minimum system 301, and the surrounding area of the radio frequency antenna 60 is an antenna clearance area. That is, for the surrounding area corresponding to the radio frequency antenna 60 and the setting area of the radio frequency antenna 60, there are no traces on the second conductive layer 112, the third conductive layer 113, and the fourth conductive layer 114, which is used to prevent signal interference and ensure communication quality.

[0055] Continue to refer to Figure 4 , in another embodiment, optionally, the interface module 10 further includes: a debugging interface 102, disposed on the first conductive layer 111 and connected to the controller minimum system 301; wherein, the debugging interface 102 is disposed close to the first side 121.

[0056] Wherein, the debugging interface 102 is connected to the controller minimum system 301. The debugging interface 102 can be specifically understood as an interface for burning a program into the controller. The debugging interface 102 can exemplarily include pin headers. The debugging interface 102, the storage circuit 303, the driving circuit 304, and the data interface 101 are arranged in sequence along the first direction X, and the radio frequency antenna 60 and the debugging interface 102 are arranged in sequence along the second direction Y.

[0057] In another embodiment, optionally, the second conductive layer 112 includes an analog power supply area and a digital power supply area that are isolated from each other; the analog module 20 draws power from the analog power supply area, and the digital module 30 draws power from the digital power supply area.

[0058] Correspondingly, the circuit board may further include: a digital power supply circuit 40 for providing a power signal to the digital power supply area; an analog power supply circuit 50 for providing a power signal to the analog power supply area.

[0059] Wherein, the digital power supply circuit 40 is disposed on the first conductive layer 111 and connected to the digital power supply area; the analog power supply circuit 50 is disposed on the fourth conductive layer 114 and connected to the analog power supply area.

[0060] Among them, the digital power supply circuit 40 includes a digital power supply chip U6 and its peripheral circuit. The peripheral circuit of the digital power supply chip U6 can exemplarily include resistors and capacitors. Any existing digital power supply circuit can be used to implement the function of digital power supply, and specific limitations are not made here. The analog power supply circuit 50 includes an analog power supply chip U7 and its peripheral circuit. The peripheral circuit of the analog power supply chip U7 can exemplarily include resistors and capacitors. Any existing analog power supply circuit can be used to implement the function of analog power supply, and specific limitations are not made here.

[0061] Specifically, the digital power supply circuit 40 is used to supply power to the digital module 30, and all the digital power signals required by the digital module 30 are powered from the digital power supply area of the second conductive layer 112. That is to say, all the digital power signals required by the components in the digital module 30 are powered from the digital power supply area of the second conductive layer 112; the analog power supply circuit 50 is used to supply power to the analog module 20, and all the analog power signals required by the analog module 20 are powered from the analog power supply area of the second conductive layer 112. That is to say, all the analog power signals required by the components in the analog module 20 are powered from the analog power supply area of the second conductive layer 112. At the same time, the components in the digital module 30 are single-point grounded through the digital ground in the third conductive layer 113, and the components in the analog module 20 are single-point grounded through the analog ground in the third conductive layer 113.

[0062] The technical solution of the embodiment of the present invention can minimize the interference of analog signals by connecting the digital module 30 and the analog module 20 to the analog power supply and the digital power supply respectively, and ensure the accuracy of the analog circuit and the stability of the digital circuit.

[0063] Optionally, the digital power supply circuit 40 is disposed close to the second side 122 and the third side 123. The RF antenna 60, the controller minimum system 301, and the digital power supply circuit 40 are arranged in sequence along the first direction X.

[0064] The analog power supply circuit 50 is disposed close to the edge of the fourth circuit layer 114, and the acquisition circuit 202 and the anti-interference circuit 201 semi-surround the analog power supply. And the peripheral circuit of the acquisition chip U1, the pacing circuit 203, the anti-interference circuit 201, and the analog power supply circuit 50 surround the acquisition chip U1.

[0065] Optionally, the circuit board further includes a debugging resistor R, which is used for debugging when the circuit board fails. The analog power supply circuit 50 and the debugging resistor R are arranged in sequence along the first direction X.

[0066] Optionally, the circuit board is a rectangular board; the size of the circuit board is 20mm * 37mm. Exemplarily, the first direction X is the extension direction of the long side of the circuit board, and the second direction Y is the extension direction of the short side of the circuit board.

[0067] An embodiment of the present utility model further provides an electrocardiogram recorder, comprising: an electrocardiogram electrode and the circuit board provided in any of the above embodiments. Therefore, this electrocardiogram recorder also has the beneficial effects achievable by any of the above embodiments.

[0068] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added or deleted. For example, the steps described in the present utility model can be executed in parallel, sequentially or in a different order, as long as the desired results of the technical solution of the present utility model can be achieved, and no limitations are imposed herein.

[0069] The above specific embodiments do not constitute a limitation to the protection scope of the present utility model. Those skilled in the art should understand that various modifications, combinations, sub - combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A circuit board, characterized in that: Applied to an electrocardiogram recorder, the circuit board comprises: The substrate comprises: a first conductive layer, a second conductive layer, a third conductive layer and a fourth conductive layer which are stacked; wherein the second conductive layer is used as a power layer, the third conductive layer is used as a ground layer; the third conductive layer comprises a digital ground and an analog ground which are isolated; The interface module comprises: a data interface; the data interface is arranged on the first conductive layer and is used to connect to the ECG electrodes of the ECG recorder; The analog module is powered from the second conductive layer and grounded through the analog ground; the analog module comprises: an anti-interference circuit and an acquisition circuit; the anti-interference circuit and the acquisition circuit are both arranged on the fourth conductive layer, and the anti-interference circuit is connected to the data interface and the acquisition circuit respectively; The digital module is powered from the second conductive layer and grounded through the digital ground; the digital module includes: a minimum controller system; the minimum controller system is arranged on the first conductive layer, and the acquisition circuit is connected to the minimum controller system.

2. The circuit board according to claim 1, characterized in that: The analog module further includes: a pacing circuit, which is arranged on the fourth conductive layer and connected to the acquisition circuit; the acquisition circuit includes an acquisition chip and its peripheral circuits; Among them, the peripheral circuit of the acquisition chip, the pacing circuit and the anti-interference circuit are arranged around the acquisition chip; the anti-interference circuit and the acquisition chip are arranged in sequence along a first direction; along the first direction, the acquisition chip and the pacing circuit are arranged on the same side of the anti-interference circuit; the acquisition chip and the pacing circuit are arranged in sequence along a second direction; the first direction and the second direction intersect.

3. The circuit board according to claim 2, characterized in that: The digital module further includes: a clock circuit, which is arranged on the fourth conductive layer and connected to the controller minimum system; wherein, along the first direction, the clock circuit is arranged on a side of the acquisition circuit away from the anti-interference circuit.

4. The circuit board according to claim 1, characterized in that: The first conductive layer includes a first side and a second side arranged opposite to each other along a first direction, and a third side and a fourth side arranged opposite to each other along a second direction; the data interface is arranged close to the second side, and the controller minimum system is arranged close to the third side; the first direction intersects with the second direction.

5. The circuit board according to claim 4, characterized in that: The digital module further includes: a storage circuit and a driving circuit; the storage circuit and the driving circuit are both arranged on the first conductive layer, and the storage circuit is connected to the controller minimum system and the driving circuit respectively; Among them, the storage circuit and the driving circuit are both arranged close to the fourth side; the storage circuit, the driving circuit and the data interface are arranged in sequence along the first direction; the controller minimum system and the storage circuit are arranged in sequence along the second direction.

6. The circuit board according to claim 4, characterized in that: Also includes: A radio frequency antenna is arranged on the first conductive layer and connected to the controller minimum system; wherein the radio frequency antenna is arranged close to the first side and the third side; and the radio frequency antenna, the controller minimum system and the data interface are arranged in sequence along the first direction.

7. The circuit board according to claim 4, characterized in that: The interface module further includes: a debugging interface, which is arranged on the first conductive layer and connected to the controller minimum system; wherein the debugging interface is arranged close to the first edge.

8. The circuit board according to claim 1, characterized in that: The second conductive layer includes an analog power supply area and a digital power supply area that are isolated from each other; the analog module draws power from the analog power supply area, and the digital module draws power from the digital power supply area; The circuit board also includes: A digital power circuit, disposed in the first conductive layer and connected to the digital power region; The analog power supply circuit is arranged in the fourth conductive layer and connected to the analog power supply region.

9. The circuit board according to any one of claims 1 to 8, characterized in that: The circuit board is a rectangular board; the size of the circuit board is 20mm*37mm.

10. An electrocardiogram recorder, characterized in that: include: An electrocardiogram electrode and a circuit board as claimed in any one of claims 1 to 9.

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