Multi-channel voltage source and generation method thereof

Abstract

The invention provides a multi-channel voltage source and a generation method thereof, the voltage source comprises a digital-to-analog conversion module, the digital-to-analog conversion module comprises voltage reference units and n conversion units, each voltage reference unit is used for providing n + 1 paths of reference voltages, the n paths of reference voltages are input into the n conversion units, and n is a positive integer; the digital signals of the n paths of reference voltages are converted into n paths of analog signals, and the rest one path of reference voltage serves as the reference voltage of the temperature acquisition module; the high-voltage amplification module comprises n first amplification units and is used for amplifying all analog signals and inputting the amplified analog signals to a direct-current electrode in the ion trap; and the integrated module comprises a voltage source plate, and the digital-to-analog conversion module and the high-voltage amplification module are integrated on the voltage source plate. The multi-channel high-precision voltage source adopts a modular design, so that a single voltage source plate can output multiple paths of DC voltage sources.

Description

Technical Field

[0001] The invention belongs to the technical field of ion trap quantum computers, and in particular relates to a multi-channel voltage source and a generation method thereof. Background Art

[0002] A high-precision voltage source is a device that can provide high-precision and high-stability voltage output. It is widely used in instrument calibration, industrial control, precision measurement, and especially in the field of quantum computing. With the continuous development of electronic technology, the requirements for the signal accuracy of measurement and control are getting higher and higher. One of the important factors for the accuracy and accuracy of signal measurement and control is the accuracy and stability of the voltage source.

[0003] There are also commercially available high-precision voltage source meters on the market, such as Keithley's 2400 series, which have excellent accuracy and stability. However, in actual applications, such as ion trap quantum computers, ions need to be trapped by electric fields. In order to obtain high-performance electric fields, more channels of precision DC sources are required. If Keithley's 2400 series equipment is used, the cost, space and control are very unfavorable for quantum computer research and development. In addition to high-precision and high-stability performance, occasions like this require voltage sources to have integration requirements, which cannot be met by common commercial voltage sources.

[0004] Therefore, it is necessary to design a multi-channel voltage source and a generation method thereof to solve the above technical problems. Summary of the invention

[0005] In view of the above problems, the present invention provides a multi-channel voltage source, the method comprising:

[0006] A digital-to-analog conversion module, comprising a voltage reference unit and n conversion units, wherein each of the voltage reference units is used to provide n+1 reference voltages, the n reference voltages are input into the n conversion units, and the digital signals of the n reference voltages are converted into n analog signals. The remaining 1 reference voltage is used as a reference voltage of the temperature acquisition module to provide calibration parameters of the analog signals, wherein n is a positive integer greater than 0;

[0007] A high-voltage amplification module, including n first amplification units, for amplifying all analog signals and then inputting them into the DC electrodes in the ion trap;

[0008] An integrated module, comprising a voltage source board, wherein the digital-to-analog conversion module and the high-voltage amplification module are integrated on the voltage source board, the control end of the conversion unit is integrated with the digital interface of the voltage source board, and the output end of the first amplification unit is integrated with the output end of the voltage source board;

[0009] The expansion module includes a backplane, a control board and a control-end PC, wherein the backplane is integrated with multiple bus interfaces, the control board is integrated with a bus controller, the digital interfaces of the voltage source boards in the multiple integrated modules are respectively connected with the multiple bus interfaces on the backplane, and the multiple bus interfaces are connected with the bus controller after being connected in parallel; the control-end PC is connected to the bus controller on the control board via Ethernet.

[0010] Furthermore, each of the voltage reference units includes a voltage reference and n+1 first operational amplifiers, wherein:

[0011] The voltage reference outputs n+1 reference voltages to n+1 first operational amplifiers for buffering the reference voltages.

[0012] Furthermore, each of the conversion units includes a digital-to-analog converter, and each of the n digital-to-analog converters receives the reference voltage output by the n first operational amplifiers, and receives instructions from the bus controller through the corresponding digital interface to convert into n analog signals.

[0013] Furthermore, the first amplifying unit comprises a second operational amplifier, wherein:

[0014] Each second operational amplifier amplifies the analog signal converted by each digital-to-analog converter and inputs the amplified analog signal to a single DC electrode in the ion trap;

[0015] The first amplifying unit also includes an analog switch, the input end of which is connected to the output end of the conversion unit and the output end of the second operational amplifier for selective switching. The analog signal input to the DC electrode is the output of the conversion unit or the output of the second operational amplifier.

[0016] Furthermore, the current detection module includes a second amplification unit and a measurement unit, wherein:

[0017] The second amplifying unit collects the output voltage of the second operational amplifier through a sampling resistor and performs differential amplification;

[0018] The measuring unit is used to measure the voltage of the output signal of the second amplifying unit.

[0019] Furthermore, the second amplifying unit includes third operational amplifiers, and each third operational amplifier collects an output voltage amplified by a second operational amplifier through a sampling resistor and performs differential amplification.

[0020] Furthermore, the measuring unit comprises an analog-to-digital converter, wherein:

[0021] The analog-to-digital converter is used to convert the voltage analog signal after differential amplification by the third operational amplifier into a digital signal and input it to the corresponding digital interface, and input it to the bus controller through the bus interface, so that the bus controller obtains the current value and reads it through the control terminal PC.

[0022] Furthermore, the temperature acquisition module includes a micro-control unit and a plurality of resistance acquisition units, wherein:

[0023] The resistance acquisition unit is installed around the outer periphery of the voltage reference and is used to simultaneously acquire multiple resistance values ​​corresponding to changes in ambient temperature;

[0024] The micro-control unit obtains voltage values ​​corresponding to multiple resistance values ​​according to the remaining 1 reference voltage, calculates the real-time temperature corresponding to the voltage value, obtains the average temperature, and inputs it to the bus controller.

[0025] Furthermore, the bus controller also obtains a temperature change value relative to an initial temperature based on an average temperature value, and calibrates the output voltage of each conversion unit that has changed based on the temperature change value, a temperature drift coefficient of a voltage reference, and the initial output voltage of each conversion unit.

[0026] Furthermore, according to the temperature change value, the temperature drift coefficient of the voltage reference and the initial output voltage of each conversion unit, the output voltage of each conversion unit that has changed is calibrated, including:

[0027] Calculate the voltage change value output by the conversion unit according to the temperature change value, the temperature drift coefficient of the voltage reference and the initial output voltage of each conversion unit;

[0028] According to the difference between the voltage change value output by the conversion unit and the output voltage of the corresponding initial conversion unit, the corresponding conversion unit is reconfigured to calibrate the output voltage of each conversion unit that has changed.

[0029] Further, the reconfiguration is as follows:

[0030] Define the voltage change value corresponding to the minimum value of the input digital quantity of the conversion unit as x uV;

[0031] The difference is divided by x uV and rounded to an integer to obtain a compensation value, the initial input digital quantity of the conversion unit is subtracted from the compensation value to obtain a new input digital quantity, and the conversion unit is configured to correspond to the new input digital quantity to obtain the calibrated output voltage of the conversion unit.

[0032] On the other hand, the present invention also provides a method for generating a multi-channel voltage source, the method comprising:

[0033] A digital-to-analog conversion module is used to convert the digital signals of n reference voltages into n analog signals, wherein the digital-to-analog conversion module includes n voltage reference units and n conversion units, each of the voltage reference units is used to provide n+1 reference voltages, the n reference voltages are input into the n conversion units, the digital signals of the n reference voltages are converted into n analog signals, and the remaining 1 is used as the reference voltage of the temperature acquisition module, wherein n is a positive integer greater than 0.

[0034] Using a high-voltage amplification module, all analog signals are amplified and then input into the DC electrode in the ion trap, wherein the high-voltage amplification module includes n first amplification units;

[0035] The digital-to-analog conversion module and the high-voltage amplification module are integrated by using an integrated module, wherein the integrated module includes a voltage source board, wherein the digital-to-analog conversion module and the high-voltage amplification module are integrated on the voltage source board, the control end of the conversion unit is integrated with the digital interface of the voltage source board, and the output end of the first amplification unit is integrated with the output end of the voltage source board;

[0036] The expansion module is used to perform multi-channel expansion of a high-precision voltage source, wherein the expansion module includes a backplane, a control board and a control-end PC, wherein the backplane is integrated with multiple bus interfaces, the control board is integrated with a bus controller, the digital interfaces of the voltage source boards in the multiple integrated modules are respectively connected to the multiple bus interfaces on the backplane, and the multiple bus interfaces are connected to the bus controller in parallel; the control-end PC is connected to the bus controller on the control board via Ethernet.

[0037] The present invention provides a multi-channel voltage source and a generation method thereof, which has the following beneficial effects:

[0038] The multi-channel high-precision voltage source of the present invention adopts a modular design, which can enable a single voltage source board to output multiple DC voltage sources. The present invention is also provided with a temperature acquisition module to compensate for the impact of temperature changes on the output voltage of the conversion unit, and the present invention adopts an expansion module method to integrate multiple integrated modules, so that more DC voltage sources can be finally output to be applied to the DC electrodes in the ion trap, providing support for the ion trapping of the ion trap. In addition, in the present invention, the control end PC is connected to the control board via Ethernet to control the output of the DC voltage source, and the corresponding number of DC voltage sources are output according to system requirements. Multiple voltage source devices can be centrally controlled through the network, and more DC voltage sources can be expanded.

[0039] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings to be used in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 A schematic diagram showing the principles of a digital-to-analog conversion module and a high-voltage amplification module according to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram showing a principle of a voltage reference unit according to an embodiment of the present invention is shown;

[0043] Figure 3 A schematic diagram showing the principle of a current detection module according to an embodiment of the present invention is shown;

[0044] Figure 4 It shows a schematic diagram of the principle of extending a single integrated module through an extension module according to an embodiment of the present invention;

[0045] Figure 5 It shows a schematic diagram of the principle of expanding multiple integrated modules through expansion modules according to an embodiment of the present invention;

[0046] Figure 6 A schematic diagram of a single DC source chassis according to an embodiment of the present invention is shown;

[0047] Figure 7 A schematic diagram of multiple DC source chassis according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] The present invention provides a multi-channel voltage source, which includes a digital-to-analog conversion module, a high-voltage amplification module, an integration module, an expansion module and a current detection module. Each module in the present invention is described in detail below.

[0050] In some embodiments of the present invention, Figure 1As shown, the digital-to-analog conversion module includes n voltage reference units and n conversion units, wherein each of the voltage reference units is used to provide n+1 reference voltages, and the n reference voltages are input into the n conversion units to convert the digital signals of the n reference voltages into n analog signals (i.e., voltage signals). The remaining 1 reference voltage is used as the reference voltage of the temperature acquisition module to provide calibration parameters of the analog signal, wherein n and n are both positive integers greater than 0, and n is a multiple of n.

[0051] Among them, Figure 2 As shown, each of the voltage reference units includes a voltage reference and n+1 first operational amplifiers. The voltage reference outputs n+1 reference voltages to the n+1 first operational amplifiers for buffering the reference voltages respectively, so as to enhance the driving capability of each reference voltage and reduce mutual interference between the n+1 reference voltages.

[0052] Among them, Figure 1 As shown, the conversion unit includes a digital to analog converter DAC (Digital to Analog Converter), each of which receives a reference voltage output by a first operational amplifier, and receives instructions from a bus controller (exemplarily, an SPI bus controller can be used) through a corresponding digital interface, and converts it into an analog signal. In this embodiment, the digital to analog converter DAC is completed by the highest-bit DAC AD5791 of ADI (Analog Devices, Inc.). The AD5791 model DAC has a resolution of 1ppm and a temperature drift characteristic of 0.05ppm / ℃. In actual applications, the error of the DAC output mainly comes from the reference voltage drift caused by the change of ambient temperature.

[0053] Therefore, a voltage reference output n+1 is used to ensure the drift consistency of each DAC reference voltage on the entire voltage source board. The temperature drift coefficient of the voltage reference is obtained by testing the temperature characteristics of the voltage reference, wherein the remaining 1 reference voltage in the n+1 voltage reference is used as the reference voltage of the temperature acquisition module to provide the calibration parameters of the analog signal, wherein the temperature acquisition module includes a micro-control unit and a plurality of resistance acquisition units, and the micro-control unit is exemplarily a micro-controller MCU (Micro Controller Unit), and the resistance acquisition unit is a thermistor whose resistance value is extremely sensitive to temperature. Exemplarily, wherein the resistance acquisition unit is installed around the outer periphery of the voltage reference, and is used to simultaneously acquire multiple resistance values ​​corresponding to changes in ambient temperature; the micro-control unit (exemplarily, the ADC of the micro-controller MCU) obtains the voltage values ​​corresponding to the multiple resistance values ​​according to the remaining 1 reference voltage, and the micro-control unit (MCU processor) calculates the real-time temperature corresponding to the voltage value, obtains the temperature average value, and inputs it to the bus controller.

[0054] The bus controller obtains the temperature change value relative to the initial temperature based on the temperature average value (that is, the difference between the temperature average value and the corresponding initial temperature), and calculates the voltage change value corresponding to each DAC output based on the temperature change value, the temperature drift coefficient of the voltage reference, and the initial output voltage of each DAC (the calculation formula is: voltage change value of DAC output = temperature change value * temperature drift coefficient of voltage reference * initial DAC output voltage), and reconfigures the corresponding DAC based on the voltage change value of the DAC output and the difference of the output voltage of the corresponding initial DAC, so as to calibrate the output voltage of each DAC that has changed, wherein the reconfiguration method is as follows: define the voltage change value corresponding to the minimum value of the DAC input digital quantity as x uV, divide the difference by x uV and round it to get the compensation value, subtract the compensation value from the initial DAC input digital quantity to get a new input digital quantity, and configure the DAC to get the calibrated DAC output voltage corresponding to the new input digital quantity. An example is given below for illustration:

[0055] For example, assume that the current reference voltage is ±10V and the temperature drift coefficient is 20ppm / °C. For a 20-bit DAC, set the input digital value to 0 to 1048575 (2 20 -1), the voltage change value corresponding to the minimum input digital value 1 is 19uV, that is, the input digital value is increased by 1, the DAC output voltage increases by 19uV, and decreased by 1, the DAC output voltage decreases by 19uV, and the input digital value is set to 524288 (2 19 ) when the output voltage is 0. Initially at 25°C, set the corresponding DAC (such as Figure 1The digital input value of DAC1 is 917504 (2 19 +3 / 4*2 19 ), the output voltage is 7.5V. When the temperature rises to 28℃, due to the temperature drift coefficient of the reference voltage 20ppm / ℃, the DAC output voltage will become 7.50015V, which is 150uV higher. The MCU reports the tested temperature data (for example, the temperature data of 28℃) to the bus controller through the bus. The bus controller reduces the corresponding DAC setting value by 8 (rounded to 150 / 19) and reconfigures it, that is, reconfigures the DAC to correspond to the new digital input value 917496 (917504-8=917496), thereby outputting the actual 7.5V voltage with an error less than 10uV, thus achieving the purpose of calibration.

[0056] In some embodiments of the present invention, the high voltage amplification module includes n first amplification units, which are used to amplify all analog signals and then input them into the DC electrodes in the ion trap; wherein, Figure 1 As shown, the first amplification unit includes a second operational amplifier, and each second operational amplifier amplifies the analog signal converted by each digital-to-analog converter and inputs it to a single DC electrode in the ion trap, wherein each first amplification unit includes one second operational amplifier, and each high-precision high-voltage operational amplifier can expand the output of a single AD5791 model DAC to ±100V, wherein the high-voltage amplification module also includes an analog switch, and the input end of the analog switch is connected to the output end of the conversion unit and the output end of the second operational amplifier for selective switching, and the analog signal input to the DC electrode is the output of the conversion unit or the output of the second operational amplifier.

[0057] In some embodiments of the present invention, the current detection module includes a second amplifying unit and a measuring unit, wherein the second amplifying unit collects the output voltage of the second operational amplifier through a sampling resistor and performs differential amplification; and the measuring unit is used to measure the voltage of the output signal of the second amplifying unit. Figure 3As shown, the second amplification unit includes a third operational amplifier IAMP (Instrumentation Amplifier), and each third operational amplifier collects the output voltage after amplification of the second operational amplifier through a sampling resistor and performs differential amplification. The measuring unit includes an analog-to-digital converter ADC, and the analog-to-digital converter ADC (Analog to Digital Converter) is used to convert the voltage analog signal after differential amplification of the third operational amplifier into a digital signal and input it to the corresponding digital interface, and input it to the bus controller through the bus interface, so that the bus controller obtains the current value and reads it through the control terminal PC as a reference for judging the working state of the voltage source output by the current channel. Among them, in this embodiment, when n is 16, the ADC can be set to convert the voltage analog signal after 16 differential amplifications into 1 digital signal, and after inputting it to the corresponding digital interface, it is finally input to the bus controller. In addition, a high-bit ADC can be used to measure the output of the instrument amplifier. The instrument amplifier (i.e., the third operational amplifier) ​​is set to have a magnification of 1000, and a 24-bit ADC is used for voltage measurement, which can obtain a minimum measurement accuracy of 100nA.

[0058] In some embodiments of the present invention, the digital-to-analog conversion module, the current detection module and the high-voltage amplification module can be integrated to form an integrated module. For example, the digital-to-analog conversion module, the current detection module and the high-voltage amplification module can be integrated on the voltage source board through a voltage source board on an integrated module, thereby finally achieving the purpose of integration in the integrated module. Specifically: the integrated module includes a voltage source board, wherein the digital-to-analog conversion module, the current detection module and the high-voltage amplification module are integrated on the voltage source board, the control end of the conversion unit is integrated on the digital interface of the voltage source board, and the output end of the first amplification unit is integrated on the output end of the voltage source board.

[0059] In some embodiments of the present invention, a single integrated module can be expanded by an expansion module, that is, the present invention also includes an expansion module, wherein, for example Figure 4 As shown, the expansion module includes a backplane and a control board, wherein the backplane integrates multiple bus interfaces, the control board integrates a bus controller, and the digital interfaces of the voltage source board in the integrated module are respectively connected to the bus interfaces on the backplane, and the bus interfaces are connected in parallel with the bus controller, thereby forming an n-channel high-precision voltage source.

[0060] Based on this, in other embodiments of the present invention, the expansion module can be used to expand the high-precision voltage source of more channels, such as Figure 5As shown, the digital interfaces of the voltage source boards in the m integrated modules are respectively connected to the m bus interfaces on the backplane. When m and n are both 16, a high-precision voltage source with 16*16=256 channels can be finally formed, wherein m is a positive integer greater than 0.

[0061] In some embodiments of the present invention, Figure 6 As shown, the expansion module also includes a control-end PC, which is connected to the bus controller on the control board via Ethernet. * A high-precision voltage source with n (for example, when m and n are both 16, then 16*16=256) channels can be installed in a DC source chassis so that it can be used by quantum devices, and Figure 7 As shown, it is also possible to use an Ethernet switch to drive multiple DC source chassis through the control end PC, expanding to multiples of m * n-channel high-precision voltage source.

[0062] Based on this, in the present invention, when n is 16, the control part can configure the 16-channel DAC through the bus controller to output the desired power supply voltage; the 20-bit DAC output is ±10, which is amplified 10 times by HVAMP (i.e., the second operational amplifier). By controlling the switching of the analog switch, the output range can be set to the output of the DAC (±10V) or the output of the second operational amplifier (±100V), and the output is ±100V. After the control end PC configures the voltage, the bus controller calculates and configures the 20-bit data to the DAC. 0~2 19 Corresponding voltage -100V~0V, 2 19 ~2 20 Corresponding to 0~100V voltage.

[0063] The controller reads the ADC through the bus controller and calculates the output current value.

[0064] The sampling resistor is 1Ω, and the voltage generated by the current I is I*1=I. After being amplified 1000 times, the voltage sent to the ADC is 1000I, that is, the ADC sampling voltage divided by 1000 is the output current.

[0065] In summary, the multi-channel high-precision voltage source of the present invention adopts a modular design, and a single voltage source board can output up to n (exemplarily, n is 16, then 16) DC voltage sources. The system adopts a bus control solution, and the control board and the voltage source board are interconnected through the bus of the backplane. The 3U chassis-shaped device can output up to 256 (when m and n are both 16) high-precision DC voltage sources. The control end PC is connected to the control board via Ethernet to control the DC voltage source output and output the corresponding number of DC voltage sources according to system requirements. Multiple voltage source devices can be centrally controlled through the network, and more channels can be expanded, for example, more than 2048 channels of high-precision DC sources.

[0066] On the other hand, in some embodiments of the present invention, a method for generating a multi-channel voltage source is also provided, the method comprising:

[0067] Using a digital-to-analog conversion module, convert the digital signals of n reference voltages into n analog signals, wherein the digital-to-analog conversion module includes n voltage reference units and n conversion units, each of the voltage reference units is used to provide n+1 reference voltages, the n reference voltages are input into the n conversion units, the digital signals of the n reference voltages are converted into n analog signals, and the remaining 1 is used as a reference voltage for the temperature acquisition module, wherein n is a positive integer greater than 0;

[0068] Using a high-voltage amplification module, all analog signals are amplified and then input into the DC electrode in the ion trap, wherein the high-voltage amplification module includes n first amplification units;

[0069] The digital-to-analog conversion module and the high-voltage amplification module are integrated by using an integrated module, wherein the integrated module includes a voltage source board, wherein the digital-to-analog conversion module and the high-voltage amplification module are integrated on the voltage source board, the control end of the conversion unit is integrated with the digital interface of the voltage source board, and the output end of the first amplification unit is integrated with the output end of the voltage source board;

[0070] The expansion module is used to perform multi-channel expansion of a high-precision voltage source, wherein the expansion module includes a backplane, a control board and a control-end PC, wherein the backplane is integrated with multiple bus interfaces, the control board is integrated with a bus controller, the digital interfaces of the voltage source boards in the multiple integrated modules are respectively connected to the multiple bus interfaces on the backplane, and the multiple bus interfaces are connected to the bus controller in parallel; the control-end PC is connected to the bus controller on the control board via Ethernet.

[0071] The current detection module is used to sample the output signal of the high-voltage amplifier module and perform voltage measurement.

[0072] In the present invention, other steps in a method for generating a multi-channel voltage source correspond one-to-one to the usage of each module in a multi-channel voltage source, and therefore, they will not be described in detail here.

[0073] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-channel voltage source, characterized in that: The voltage source comprises: A digital-to-analog conversion module, comprising a voltage reference unit and n conversion units, wherein each of the voltage reference units is used to provide n+1 reference voltages, the n reference voltages are input into the n conversion units, and the digital signals of the n reference voltages are converted into n analog signals. The remaining 1 reference voltage is used as a reference voltage of the temperature acquisition module to provide calibration parameters of the analog signals, wherein n is a positive integer greater than 0; A high-voltage amplification module, including n first amplification units, for amplifying all analog signals and then inputting them into the DC electrodes in the ion trap; An integrated module, comprising a voltage source board, wherein the digital-to-analog conversion module and the high-voltage amplification module are integrated on the voltage source board, the control end of the conversion unit is integrated with the digital interface of the voltage source board, and the output end of the first amplification unit is integrated with the output end of the voltage source board; The expansion module includes a backplane, a control board and a control-end PC, wherein the backplane is integrated with multiple bus interfaces, the control board is integrated with a bus controller, the digital interfaces of the voltage source boards in the multiple integrated modules are respectively connected with the multiple bus interfaces on the backplane, and the multiple bus interfaces are connected with the bus controller after being connected in parallel; the control-end PC is connected to the bus controller on the control board via Ethernet.

2. A multi-channel voltage source according to claim 1, characterized in that: Each of the voltage reference units includes a voltage reference and n+1 first operational amplifiers, wherein: The voltage reference outputs n+1 reference voltages to n+1 first operational amplifiers for buffering the reference voltages.

3. A multi-channel voltage source according to claim 2, characterized in that: Each of the conversion units includes a digital-to-analog converter, and each of the n digital-to-analog converters receives the reference voltage output by the n first operational amplifiers, and receives instructions from the bus controller through the corresponding digital interface to convert into n analog signals.

4. A multi-channel voltage source according to claim 3, characterized in that: The first amplifying unit comprises a second operational amplifier, wherein: Each second operational amplifier amplifies the analog signal converted by each digital-to-analog converter and inputs the amplified analog signal to a single DC electrode in the ion trap; The first amplifying unit also includes an analog switch, the input end of which is connected to the output end of the conversion unit and the output end of the second operational amplifier for selective switching. The analog signal input to the DC electrode is the output of the conversion unit or the output of the second operational amplifier.

5. A multi-channel voltage source according to claim 4, characterized in that: The current detection module includes a second amplification unit and a measurement unit, wherein: The second amplifying unit collects the output voltage of the second operational amplifier through a sampling resistor and performs differential amplification; The measuring unit is used to measure the voltage of the output signal of the second amplifying unit.

6. A multi-channel voltage source according to claim 5, characterized in that: The second amplifying unit includes third operational amplifiers, and each third operational amplifier collects an output voltage amplified by a second operational amplifier through a sampling resistor and performs differential amplification.

7. A multi-channel voltage source according to claim 6, characterized in that: The measuring unit comprises an analog-to-digital converter, wherein The analog-to-digital converter is used to convert the voltage analog signal after differential amplification by the third operational amplifier into a digital signal and input it to the corresponding digital interface, and input it to the bus controller through the bus interface, so that the bus controller obtains the current value and reads it through the control terminal PC.

8. A multi-channel voltage source according to any one of claims 1 to 7, characterized in that: The temperature acquisition module includes a micro-control unit and multiple resistance acquisition units, wherein: The resistance acquisition unit is installed around the outer periphery of the voltage reference and is used to simultaneously acquire multiple resistance values ​​corresponding to changes in ambient temperature; The micro-control unit obtains voltage values ​​corresponding to multiple resistance values ​​according to the remaining 1 reference voltage, calculates the real-time temperature corresponding to the voltage value, obtains the average temperature, and inputs it to the bus controller.

9. A multi-channel voltage source according to claim 8, characterized in that: The bus controller also obtains a temperature change value relative to an initial temperature based on the temperature average value, and calibrates the output voltage of each conversion unit that has changed based on the temperature change value, the temperature drift coefficient of the voltage reference, and the initial output voltage of each conversion unit.

10. A multi-channel voltage source according to claim 9, characterized in that: According to the temperature change value, the temperature drift coefficient of the voltage reference and the initial output voltage of each conversion unit, the output voltage of each conversion unit that has changed is calibrated, including: Calculate the voltage change value output by the conversion unit according to the temperature change value, the temperature drift coefficient of the voltage reference and the initial output voltage of each conversion unit; According to the difference between the voltage change value output by the conversion unit and the output voltage of the corresponding initial conversion unit, the corresponding conversion unit is reconfigured to calibrate the output voltage of each conversion unit that has changed.

11. A multi-channel voltage source according to claim 10, characterized in that: The reconfiguration method is as follows: Define the voltage change value corresponding to the minimum value of the input digital quantity of the conversion unit as x uV; The difference is divided by x uV and rounded to an integer to obtain a compensation value, the initial input digital quantity of the conversion unit is subtracted from the compensation value to obtain a new input digital quantity, and the conversion unit is configured to correspond to the new input digital quantity to obtain the calibrated output voltage of the conversion unit.

12. A method for generating a multi-channel voltage source, characterized in that: The method comprises: A digital-to-analog conversion module is used to convert the digital signals of n reference voltages into n analog signals, wherein the digital-to-analog conversion module includes n voltage reference units and n conversion units, each of the voltage reference units is used to provide n+1 reference voltages, the n reference voltages are input into the n conversion units, the digital signals of the n reference voltages are converted into n analog signals, and the remaining 1 is used as the reference voltage of the temperature acquisition module, wherein n is a positive integer greater than 0. Using a high-voltage amplification module, all analog signals are amplified and then input into the DC electrode in the ion trap, wherein the high-voltage amplification module includes n first amplification units; The digital-to-analog conversion module and the high-voltage amplification module are integrated by using an integrated module, wherein the integrated module includes a voltage source board, wherein the digital-to-analog conversion module and the high-voltage amplification module are integrated on the voltage source board, the control end of the conversion unit is integrated with the digital interface of the voltage source board, and the output end of the first amplification unit is integrated with the output end of the voltage source board; An expansion module is used to perform multi-channel expansion of a high-precision voltage source, wherein the expansion module includes a backplane, a control board and a control-end PC, wherein the backplane is integrated with multiple bus interfaces, the control board is integrated with a bus controller, the digital interfaces of the voltage source boards in the multiple integrated modules are respectively connected to the multiple bus interfaces on the backplane, and the multiple bus interfaces are connected to the bus controller in parallel; the control-end PC is connected to the bus controller on the control board via Ethernet.

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