Eight-channel high-bandwidth digital servo controller for cold atom experiments

Abstract

The application discloses an eight-channel high-bandwidth digital servo controller for cold atom experiments, and belongs to the field of cold atom physics experimental equipment, which comprises eight 40-port connection slots on a printed circuit board; a field programmable gate array core board is embedded on the printed circuit board, and any 40 digital I / O ports of the core board are in communication connection with the eight 40-port connection slots on the printed circuit board; each double-channel analog-digital converter is installed on the printed circuit board through the 40-port connection slot and is in communication connection with any 40 digital I / O ports of the core board; and each double-channel digital-analog converter is installed on the printed circuit board through the 40-port connection slot and is in communication connection with any 40 digital I / O ports of the core board. Each digital circuit channel for processing a sampling signal in the core board runs a signal control firmware. The controller has eight channels which can be combined with the digital servo controller to complete more complex control tasks.

Description

Technical Field

[0001] This invention belongs to the technical field of cold atom physics experimental equipment, and particularly relates to an eight-channel high-bandwidth digital servo controller for cold atom experiments. Background Technology

[0002] Cold atom physics experiments require the manipulation and measurement of the quantum states of microscopic particles such as atoms, molecules, and ions. Because the quantum state evolution of these particles is extremely sensitive to the properties of the coupled electromagnetic fields, active stabilization of various experimental parameters is necessary, such as the frequency, power, and phase of the laser, and the amplitude and direction of the coil's magnetic field. Active stabilization of these parameters is typically based on a proportional-integral-differential closed-loop feedback control algorithm, implemented using a dedicated servo controller.

[0003] Traditional servo controllers use analog circuits, employing basic components such as resistors, capacitors, and inductors to simulate proportional, integral, and differential processes, thereby implementing feedback control algorithms. Analog servo controllers commonly used in cold atom experiments, such as the D2-125 from Vescent and the Falc110 from Toptica, offer excellent performance with bandwidths reaching 10MHz. However, they are very expensive, bulky, and have only one channel. Due to the characteristics of analog circuits, modifying the internal circuitry of analog servo controllers is extremely difficult and costly. Under the complex experimental conditions of cold atom experiments, different analog servo controllers are typically required.

[0004] Due to the limitations of analog servo controllers and the rapid development of digital circuits, digital servo systems based on field-programmable gate arrays (FPGAs) have emerged in recent years for cold atom experimental systems. Benefiting from abundant digital hardware resources, such as numerous logic chips, memory cells, and multi-channel input / output interfaces, FPGAs can execute various complex algorithms at high speed and in parallel, including the proportional-integral-differential closed-loop feedback control algorithm commonly used in cold atom experimental systems. Due to the characteristics of their internal digital circuits, algorithms can be recompiled and parameters reconfigured without hardware modifications. Furthermore, compared to analog circuits, digital circuits are relatively less sensitive to external noise interference, making them highly attractive for cold atom experiments with complex application scenarios. For example, a FPGA named "Dragon Fruit" has been widely used in servo controller research by cold atom research groups both domestically and internationally in recent years. It has two feedback control channels, can be developed using common hardware languages, and boasts advantages such as low cost and small footprint.

[0005] With the rapid development of cold atom physics experimental research in recent years, experimental systems have become increasingly complex. Experiments involving multi-particle and hybrid systems require a significant increase in actively stabilized physical parameters, thus requiring a corresponding increase in the number of servo control channels. Both traditional analog servo controllers and digital servo controllers implemented using Dragon Fruit, with no more than two channels, are insufficient to handle the large number of experimental parameters requiring stability. Increasing the number of servo controllers to address this issue would lead to problems such as large space requirements, low fault tolerance, and inability to achieve unified control.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The purpose of this invention is to provide an eight-channel high-bandwidth digital servo controller for cold atom experiments, which can perform active stabilization of multiple physical parameters in cold atom experiments in a unified and parallel manner within a single digital servo controller, thereby solving the aforementioned technical problems existing in the prior art.

[0008] The objective of this invention is achieved through the following technical solution:

[0009] An eight-channel high-bandwidth digital servo controller for cold atom experiments, comprising:

[0010] Printed circuit board, field-programmable gate array core board, four dual-channel analog-to-digital converters, and four dual-channel digital-to-analog converters; among which,

[0011] The printed circuit board has eight 40-port connection slots.

[0012] The field-programmable gate array (FPGA) core board is embedded on the printed circuit board, and any 40 digital I / O ports of the FPGA core board are respectively connected to the eight 40-port connection slots on the printed circuit board.

[0013] Each dual-channel analog-to-digital converter is mounted on the printed circuit board via a 40-port connection slot and communicates with any 40 digital I / O ports of the field-programmable gate array core board.

[0014] Each dual-channel digital-to-analog converter is mounted on the printed circuit board via a 40-port connection slot and communicates with any 40 digital I / O ports of the field-programmable gate array core board.

[0015] Each digital circuit channel within the field-programmable gate array core board that processes the sampled signal runs signal control firmware.

[0016] Compared with existing technologies, the eight-channel high-bandwidth digital servo controller for cold atom experiments provided by this invention has the following advantages:

[0017] By embedding a field-programmable gate array (FPGA) core board on a printed circuit board (PCB), and installing four dual-channel analog-to-digital converters (ADCs) and four dual-channel digital-to-analog converters (DACs) through eight 40-port connection slots on the PCB, a digital servo controller with an eight-channel input and eight-channel output configuration is formed, far exceeding the channel count of current digital servo controllers. The overall signal processing time delay introduced by each channel is 390 nanoseconds, signifying that each channel has a control bandwidth of up to 1.25MHz. By employing specific models of ADCs and DACs, the noise level at the analog-to-digital input stage is less than 10 microvolts, and the noise level at the digital-to-analog output stage is less than 1 microvolt. This digital servo controller, with its eight-channel advantage, can uniformly and conveniently implement the control process of multiple physical quantities in cold atom systems compared to traditional analog servo controllers and currently available digital servo controllers. Due to the ease of development of this digital circuit, various specific algorithms used in cold atom experiments can be combined with this digital servo controller to complete more complex control tasks. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a block diagram of an eight-channel high-bandwidth digital servo controller for cold atom experiments provided in an embodiment of the present invention.

[0020] Figure 2 This is a block diagram illustrating the configuration of signal control firmware for each digital circuit channel of the digital servo controller provided in an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the specific content of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments, which do not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0022] First, the following explanations are provided for the terms that may be used in this article:

[0023] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0024] The terms “including,” “comprising,” “containing,” “having,” or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, “including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.)” should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0025] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0026] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0027] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0028] The following is a detailed description of the eight-channel high-bandwidth digital servo controller for cold atom experiments provided by this invention. Contents not described in detail in the embodiments of this invention are prior art known to those skilled in the art. Where specific conditions are not specified in the embodiments of this invention, conventional conditions or conditions recommended by the manufacturer should be followed. Reagents or instruments used in the embodiments of this invention, unless otherwise specified, are all commercially available products.

[0029] like Figure 1 As shown, this embodiment of the invention provides an eight-channel high-bandwidth digital servo controller for cold atom experiments, comprising:

[0030] Printed circuit board, field-programmable gate array core board, four dual-channel analog-to-digital converters, and four dual-channel digital-to-analog converters; among which,

[0031] The printed circuit board has eight 40-port connection slots.

[0032] The field-programmable gate array (FPGA) core board is embedded on the printed circuit board, and any 40 digital I / O ports of the FPGA core board are respectively connected to the eight 40-port connection slots on the printed circuit board.

[0033] Each dual-channel analog-to-digital converter is mounted on the printed circuit board via a 40-port connection slot and communicates with any 40 digital I / O ports of the field-programmable gate array core board.

[0034] Each dual-channel digital-to-analog converter is mounted on the printed circuit board via a 40-port connection slot and communicates with any 40 digital I / O ports of the field-programmable gate array core board.

[0035] Each digital circuit channel within the field-programmable gate array core board that processes the sampled signal runs signal control firmware.

[0036] The four dual-channel analog-to-digital converters in the above controller are respectively Figure 1 The first dual-channel analog-to-digital converter, the second dual-channel analog-to-digital converter, the third dual-channel analog-to-digital converter, and the fourth dual-channel analog-to-digital converter are included.

[0037] The four dual-channel digital-to-analog converters in the above controller are respectively Figure 1 The first dual-channel digital-to-analog converter, the second dual-channel digital-to-analog converter, the third dual-channel digital-to-analog converter, and the fourth dual-channel digital-to-analog converter are included.

[0038] See Figure 2 In the aforementioned digital servo controller, the signal control firmware includes:

[0039] The system comprises a sampling signal receiver, a preprocessing module, a phase delay module, a direct digital synthesizer, a total error signal output terminal, a first error signal processing module, a second error signal processing module, and a total feedback signal input terminal; among which,

[0040] The preprocessing module is respectively configured with the sampling signal input terminal, the error signal output terminal, and the phase input terminal;

[0041] The sampling signal receiving end is communicatively connected to the sampling signal input end of the preprocessing module;

[0042] The phase delay module is provided with a phase output terminal and a modulation signal output terminal, and the phase output terminal is communicatively connected to the phase input terminal of the preprocessing module.

[0043] The preprocessing module is communicatively connected to the total output terminal of the error signal;

[0044] The total output terminal of the error signal is communicatively connected to the first error signal processing module and the second error signal processing module, respectively.

[0045] The first error signal processing module is provided with a first feedback signal output terminal, which is communicatively connected to the total feedback signal output terminal;

[0046] The second error signal processing module is provided with a fast feedback signal output terminal and a slow feedback signal output terminal, which are respectively connected to the total feedback signal output terminal.

[0047] Preferably, in the above signal control firmware, the preprocessing module consists of a fourth low-pass filter, a mixer, and a fifth low-pass filter connected in sequence; wherein, the fourth low-pass filter is configured as the input terminal of the sampling signal;

[0048] The mixer is provided with a phase input terminal;

[0049] The fifth low-pass filter is configured to output an error signal.

[0050] Preferably, in the above-mentioned signal control firmware, the first error signal processing module includes:

[0051] The system comprises a first proportional-integral-differentiator, a first low-pass filter, and a first scanning module; wherein...

[0052] The first proportional-integral-differentiator has a first sampling input terminal and an output terminal. The first sampling input terminal is communicatively connected to the total output terminal of the error signal, and the output terminal is electrically connected to the first low-pass filter.

[0053] The output of the first scanning module is connected to the first control switch circuit, and the output of the first low-pass filter is connected to the total input of the feedback signal after being output by the first XOR circuit.

[0054] Preferably, in the above-mentioned signal control firmware, the second error signal processing module includes:

[0055] Fast feedback processing submodule and slow feedback processing submodule;

[0056] The fast feedback processing submodule consists of a second proportional-integral-differentiator and a second low-pass filter connected in sequence, with the output of the second low-pass filter connected to the total input of the feedback signal.

[0057] The slow feedback processing submodule includes: a second integrator and a third low-pass filter connected in sequence; the output of the third low-pass filter is communicatively connected to a second XOR circuit; and the output of the second scanning module is communicatively connected to the second XOR circuit via a second switch control circuit.

[0058] The output of the second XOR is connected to the total input of the feedback signal.

[0059] It can be seen that each component of the aforementioned signal control firmware is implemented through programming the programmable gate array (GGA) of the field-programmable gate array (FPGA) core board. For example, the implementation of the first proportional-integral-differentiator can be achieved by performing proportional, integral, and differential operations on the sampled signal using the FPGA, and then accumulating the results through set weighting parameters to obtain the feedback signal.

[0060] Preferably, in the above-mentioned digital servo controller, the field-programmable gate array (FPGA) core board is an FPGA core board with 50,000 logic chips and more than 500 input and output ports.

[0061] Preferably, in the above-mentioned digital servo controller, the analog-to-digital converter is a dual-channel, 12-bit analog-to-digital converter with a sampling rate of 65MHz. For example, the AD9238 analog-to-digital converter can achieve a noise level of less than 10 microvolts at the analog-to-digital input stage.

[0062] Preferably, in the above-mentioned digital servo controller, the digital-to-analog converter is a dual-channel, 14-bit digital-to-analog converter with a sampling rate of 125MHz. For example, the AD9767 digital-to-analog converter can achieve a noise level of less than 1 microvolt in the digital-to-analog output stage.

[0063] Preferably, in the above-mentioned digital servo controller, each of the dual-channel analog-to-digital converters attenuates the input signal from ±5 volts to the range of 1 volt to 3 volts through an AD8065 chip;

[0064] Each of the dual-channel digital-to-analog converters converts the input signal from a differential current range of ±20 mA to a voltage range of -5 V to 5 V via an AD8065 chip.

[0065] Preferably, in the aforementioned digital servo controller, the printed circuit board is equipped with a high-speed serial computer expansion bus, and the field-programmable gate array (FPGA) core board is communicatively connected to the high-speed serial computer expansion bus, enabling communication with an external computer via the high-speed serial computer expansion bus. By setting up a high-speed serial computer expansion bus (i.e., a PCIe interface), the digital servo controller can achieve high-speed communication with an external computer.

[0066] In summary, the digital servo controller of this invention has the advantage of 8 channels. Compared with traditional analog servo controllers and currently available digital servo controllers, it can uniformly and conveniently realize the control process of multiple physical quantities in cold atom systems. Due to the ease of development of this digital circuit, various specific algorithms in cold atom experiments can be combined with this digital servo controller to complete more complex control tasks.

[0067] To more clearly demonstrate the technical solution and its effects provided by the present invention, the following describes in detail the eight-channel high-bandwidth digital servo controller for cold atom experiments provided by the present invention with specific embodiments.

[0068] Example 1

[0069] like Figure 1As shown, this embodiment of the invention provides an eight-channel high-bandwidth digital servo controller for cold atom experiments. A field-programmable gate array (FPGA) core board is embedded on a printed circuit board, forming the main body of the digital servo controller along with four dual-channel analog-to-digital converters (ADCs) and four dual-channel digital-to-analog converters (DACs). A Xilinx Kintex-7 XC7K325T FPGA core board with 50,000 logic chips and over 500 input / output ports is selected to handle the heavy algorithm execution tasks of eight channels. The ADC is an AD9238 (Analog Devices), featuring dual channels, 12 bits, and a 65MHz sampling rate. The DAC is an AD9767 (Analog Devices), featuring dual channels, 14 bits, and a 125MHz sampling rate. Both converters extend the voltage range to ±5V using an AD8065 (Analog Devices) operational amplifier.

[0070] The converter is detachably connected to the field-programmable gate array (FPGA), specifically through eight 40-port connection slots on the printed circuit board. Figure 1 As shown in the lower right corner, this digital servo controller contains 40 digital input / output ports to meet the triggering requirements of cold atom experiments. Its detachable design facilitates switching between different converters to address the needs of various scenarios in cold atom experiments. Communication between the digital servo controller and the computer is implemented using a high-speed serial computer extended bus standard, ensuring high-speed communication.

[0071] Figure 2 The image shows the firmware portion of a single channel of the digital servo controller; the other channels operate on the same principle. The top-level clock of the field-programmable gate array (FPGA) has been modified to 200MHz, significantly improving its digital signal processing speed. If the sampled signal is the error signal, it will be directly input into the proportional-integral-differential (PI-DI) algorithm. For cases with poor signal-to-noise ratio (SNR), the servo system internally provides a lock-in amplifier module to improve the SNR, and then inputs the resulting error signal into the PI-DI algorithm. Once the PI-DI algorithm obtains the error signal, it quickly performs calculations, derives a feedback signal, and outputs the control signal via a digital-to-analog converter. For physical systems with dual control quantities, such as external cavity diode lasers with both piezoelectric ceramic feedback gratings and injected current feedback diodes, the digital servo also provides a PI-DI algorithm, capable of simultaneously feeding back two control quantities.

[0072] The digital servo firmware includes a direct digital synthesizer, a digital Butterworth filter, a scanning module, and other components to facilitate the feedback process. Module calls, parameter modifications, and feedback status control are all implemented on the computer.

[0073] Example 2

[0074] This embodiment provides an eight-channel high-bandwidth digital servo controller for cold atom experiments. The connection relationships of the components are the same as in Embodiment 1. The connection between the two types of converters and the field-programmable gate array (FPGA) core board on the printed circuit board remains detachable. The difference lies in the selection of the FPGA core board model, the analog-to-digital converter (ADC), and the digital-to-analog converter (DAC). For example, the ADC may use models such as AD9280, AD9226, and AD7606, and the DAC may use models such as AD9708 and AD9775. This does not affect the design and overall performance of the servo system. The number of input channels and output channels are slightly increased, such as up to 15 channels, without affecting the performance of this digital servo controller.

[0075] Example 3

[0076] The hardware is essentially the same as described in the previous two specific implementation schemes, with slight adjustments to the firmware. The modified firmware is limited to digital algorithms commonly used in cold atom experiments, such as using only the first proportional-integral-differentiator and omitting the second proportional-integral-differentiator; and omitting the digital low-pass filter. This does not affect the performance of the digital servo controller.

[0077] This invention, based on a field-programmable gate array (FPGA), implements an eight-channel digital servo controller, each channel possessing a high control bandwidth exceeding 1MHz. Both the analog-to-digital converter (ADC) and the digital-to-analog converter (DAC) are detachably connected to the main unit. This design allows for the selection of the optimal converter for active stabilization in different application scenarios. This invention solves the problem of insufficient servo controller channels in cold atom experimental research. Each channel can be optimized for physical parameters with different requirements and can be combined with other specific algorithms to uniformly manage the active stabilization process of multiple physical parameters.

[0078] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of the present invention and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. An eight-channel high-bandwidth digital servo controller for cold atom experiments, characterized in that, The printed circuit board, the field programmable gate array core board, four double-channel analog-digital converters, and four double-channel digital-analog converters are included. Eight 40-port connection slots are arranged on the printed circuit board. The field programmable gate array core board is embedded on the printed circuit board, and any 40 digital I / O ports of the field programmable gate array core board are in communication connection with the eight 40-port connection slots on the printed circuit board. Each double-channel analog-digital converter is installed on the printed circuit board through a 40-port connection slot and is in communication connection with any 40 digital I / O ports of the field programmable gate array core board. Each double-channel digital-analog converter is installed on the printed circuit board through a 40-port connection slot and is in communication connection with any 40 digital I / O ports of the field programmable gate array core board. Each digital circuit channel processing a sampling signal in the field programmable gate array core board runs a signal control firmware. The field programmable gate array core board adopts an editable logic gate array core board with 50,000 logic slices and more than 500 input ports and output ports. The signal control firmware includes a sampling signal receiving end, a preprocessing module, a phase delay module, a direct digital synthesizer, an error signal total output end, a first error signal processing module, a second error signal processing module, and a feedback signal total input end. The preprocessing module is respectively provided with a sampling signal input end, an error signal output end, and a phase input end. The sampling signal receiving end is in communication connection with the sampling signal input end of the preprocessing module. The phase delay module is respectively provided with a phase output end and a modulation signal output end, and the phase output end is in communication connection with the phase input end of the preprocessing module. The preprocessing module is in communication connection with the error signal total output end. The error signal total output end is in communication connection with the first error signal processing module and the second error signal processing module. The first error signal processing module is provided with a first feedback signal output end and is in communication connection with the feedback signal total output end. The second error signal processing module is respectively provided with a fast feedback signal output end and a slow feedback signal output end, and the fast feedback signal output end and the slow feedback signal output end are in communication connection with the feedback signal total output end. The preprocessing module is composed of a fourth low-pass filter, a mixer, and a fifth low-pass filter connected in sequence.

2. The eight-channel high-bandwidth digital servo controller for cold atom experiments of claim 1, wherein, The fourth low-pass filter is provided with the sampling signal input end. The mixer is provided with the phase input end. The fifth low-pass filter is provided with the error signal output end.

3. The eight-channel high-bandwidth digital servo controller for cold atom experiments of claim 1, wherein, The first error signal processing module includes a first proportional-integral-derivative device, a first low-pass filter, and a first scanning module. The first proportional-integral-derivative device is provided with a first sampling input end and an output end, the first sampling input end is in communication connection with the error signal total output end, and the output end is in electrical connection with the first low-pass filter. ​ The output end of the first scanning module is connected with a first control switch circuit, and the output end of the first low-pass filter is connected with the feedback signal total input end through a first exclusive OR circuit.

4. The eight-channel high-bandwidth digital servo controller for cold atom experiments of claim 1, wherein, The second error signal processing module comprises: a fast feedback processing submodule and a slow feedback processing submodule; The fast feedback processing submodule is composed of a second proportional-integral-derivative filter and a second low-pass filter connected in sequence, and the output end of the second low-pass filter is connected with the feedback signal total input end; The slow feedback processing submodule comprises a second integrator and a third low-pass filter connected in sequence, the output end of the third low-pass filter is connected with a second exclusive OR circuit, and the output end of the second scanning module is connected with the second exclusive OR circuit through a second switch control circuit, The output end of the second exclusive OR circuit is connected with the feedback signal total input end.

5. The eight-channel high-bandwidth digital servo controller for cold atom experiments of any of claims 1-3, wherein, The analog-digital converter adopts a double-channel, 12-bit, 65M sampling rate analog-digital converter.

6. The eight-channel high-bandwidth digital servo controller for cold atom experiments of any of claims 1-3, wherein, The digital-analog converter adopts a double-channel, 14-bit, 125M sampling rate digital-analog converter.

7. The eight-channel high-bandwidth digital servo controller for cold atom experiments of any of claims 1-3, wherein, Each double-channel analog-digital converter attenuates the input signal from 5 volts to 3 volts through an AD8065 chip; Each double-channel digital-analog converter converts the input signal from a differential current range of 20 milliamperes to a voltage range of -5 volts to 5 volts through an AD8065 chip.

8. The eight-channel high-bandwidth digital servo controller for cold atom experiments of any of claims 1-3, wherein, The printed circuit board is provided with a high-speed serial computer expansion bus, the field programmable gate array core board is in communication connection with the high-speed serial computer expansion bus, and can be in communication connection with an external computer through the high-speed serial computer expansion bus.

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