A multi-channel voltage source and method of generating the same

Abstract

The application provides a multi-channel voltage source and a generation method thereof, and the voltage source comprises: a digital-to-analog conversion module, including voltage reference units and n conversion units, wherein each voltage reference unit is used for providing n+1 reference voltages, n reference voltages are input into the n conversion units, digital signals of the n reference voltages are converted into n analog signals, and the remaining 1 reference voltage is used as a reference voltage of a temperature acquisition module; a high-voltage amplification module, including n first amplification units, which are used for amplifying all the analog signals and then inputting the analog signals into DC electrodes in an ion trap; and an integrated module, including 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 multi-channel high-precision voltage source of the application adopts a modular design, so that a single voltage source board can output multiple DC voltage sources.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ion trap quantum computers, and particularly relates to a multi-channel voltage source and a generation method thereof. BACKGROUND

[0002] A high-precision voltage source is a device capable of providing high-precision and high-stability voltage output, and is widely used in instrument calibration, industrial control, precision measurement, and particularly in the field of quantum computing. With the continuous development of electronic technology, the signal precision requirement of measurement and control is higher and higher, and one of the important factors of signal measurement and control precision and accuracy is the precision and stability of the voltage source.

[0003] There are also commercially available high-precision voltage source tables on the market, such as the 2400 series of Keithley, which have very good precision and stability. However, in actual application scenarios, such as ion trap quantum computers, ion trapping needs to be performed through an electric field. In order to obtain a high-performance electric field, more channels of precision DC sources are required. If the 2400 series of Keithley devices are used, the cost, space, and control are all very unfavorable for quantum computer research and development. Similar occasions require not only high precision and high stability of the voltage source, but also integration, and common commercially available voltage sources cannot meet the requirements.

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

[0005] In view of the above problems, the application provides a multi-channel voltage source, which comprises:

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

[0007] A high-voltage amplification module comprising n first amplification units, which is used to amplify all analog signals and input them into a direct current electrode in an ion trap;

[0008] An integrated module comprising a voltage source board, wherein the analog-digital conversion 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;

[0009] The extension module comprises a backboard, a control board and a control terminal PC, wherein a plurality of bus interfaces are integrated on the backboard, a bus controller is integrated on the control board, the digital interfaces of the voltage source boards in the plurality of integrated modules are respectively connected with the plurality of bus interfaces on the backboard, and the plurality of bus interfaces are connected with the bus controller in parallel; and the control terminal PC is connected to the bus controller on the control board through Ethernet.

[0010] Further, each of the voltage reference units comprises a voltage reference and n+1 first operational amplifiers, wherein,

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

[0012] Further, each of the conversion units comprises digital-to-analog converters, and every n digital-to-analog converters receive the reference voltages output by the n first operational amplifiers and receive the instructions of the bus controller through the corresponding digital interfaces to convert into n analog signals.

[0013] Further, the first amplification unit comprises second operational amplifiers, wherein,

[0014] Each of the second operational amplifiers amplifies the analog signals converted by each of the digital-to-analog converters and inputs the analog signals to a single DC electrode in the ion trap.

[0015] The first amplification unit further comprises an analog switch, an input end of the analog switch is connected with an output end of the conversion unit and an output end of the second operational amplifier, and the analog switch is used for selectively switching the analog signals input to the DC electrode to be the output of the conversion unit or the output of the second operational amplifier.

[0016] Further, the current detection module comprises a second amplification unit and a measurement unit, wherein,

[0017] The second amplification unit collects the output voltages of the second operational amplifiers through sampling resistors and differentially amplifies the output voltages.

[0018] The measurement unit is used for voltage measurement on the output signals of the second amplification unit.

[0019] Further, the second amplification unit comprises third operational amplifiers, and each of the third operational amplifiers collects the output voltages of the second operational amplifiers after amplification through a sampling resistor and differentially amplifies the output voltages.

[0020] Further, the measurement unit comprises an analog-to-digital converter, wherein,

[0021] The analog-to-digital converter is used for converting the voltage analog signal after differential amplification by the third operational amplifier into a digital signal and inputting into a corresponding digital interface, and inputting into the bus controller through the bus interface, so that the bus controller obtains the current value through the control end PC reading.

[0022] Further, the temperature acquisition module comprises a micro-control unit and a plurality of resistance acquisition units.

[0023] The resistance acquisition units are installed around the voltage reference, and are used for simultaneously acquiring a plurality of resistance values corresponding to the change of the ambient temperature.

[0024] The micro-control unit obtains the voltage values corresponding to the plurality of resistance values according to the remaining one-way reference voltage, calculates the real-time temperature corresponding to the voltage values, obtains the temperature average value, and inputs into the bus controller.

[0025] Further, the bus controller also obtains the temperature change value relative to the initial temperature according to the temperature average value, and calibrates the output voltage of each changed 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.

[0026] Further, the calibration of the output voltage of each changed 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 comprises:

[0027] Calculating the voltage change value of the output of 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 of the output of the conversion unit and the initial output voltage of the corresponding conversion unit, the corresponding conversion unit is reconfigured to calibrate the output voltage of each changed conversion unit.

[0029] Further, the reconfiguration is as follows:

[0030] Defining the voltage change value corresponding to the minimum value of the input digital quantity of the conversion unit as xuV.

[0031] Dividing the difference by xuV and taking the integer to obtain a compensation value, subtracting the compensation value from the initial input digital quantity of the conversion unit to obtain a new input digital quantity, configuring the new input digital quantity of the conversion unit, and obtaining the calibrated output voltage of the conversion unit.

[0032] On the other hand, the application also provides a generation method of a multi-channel voltage source, the method comprising:

[0033] The digital signal of the n-way reference voltage is converted into n-way analog signals by using a digital-to-analog conversion module, wherein the digital-to-analog conversion module comprises n voltage reference units and n conversion units, each of the voltage reference units is used for providing n+1-way reference voltage, n-way reference voltage is input into the n conversion units to convert the digital signal of the n-way reference voltage into n-way analog signals, and the remaining 1-way is used as a temperature acquisition module reference voltage, wherein n is a positive integer greater than 0.

[0034] All the analog signals are amplified by using a high-voltage amplification module and then input into the direct current electrode in the ion trap, wherein the high-voltage amplification module comprises 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 comprises a voltage source board, 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 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.

[0036] The multi-channel expansion of the high-precision voltage source is performed by using an expansion module, wherein the expansion module comprises a backboard, a control board and a control end PC, a plurality of bus interfaces are integrated on the backboard, a bus controller is integrated on the control board, the digital interfaces of the voltage source boards in the plurality of integrated modules are respectively connected with the plurality of bus interfaces on the backboard, and the plurality of bus interfaces are connected with the bus controller in parallel; and the control end PC is connected to the bus controller on the control board through Ethernet.

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

[0038] The multi-channel high-precision voltage source of the application adopts modular design, so that a single voltage source board can output multiple DC voltage sources. The application further provides a temperature acquisition module to compensate the influence of temperature change on the output voltage of the conversion unit. The expansion module is used to integrate a plurality of integrated modules, so that more DC voltage sources can be finally output to be applied to the direct current electrode in the ion trap to support the ion confinement of the ion trap. In addition, in the application, the control end PC is connected to the control board through Ethernet to control the output of the DC voltage source, and the corresponding number of DC voltage sources can be output according to the system requirement. The plurality of 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 application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims, and the appended 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 FIG2 shows a schematic diagram of a voltage reference unit according to an embodiment of the present invention;

[0043] Figure 3 FIG2 shows a schematic diagram of the principle of a current detection module according to an embodiment of the present invention;

[0044] Figure 4 It shows a schematic diagram of the principle of expanding a single integrated module through an expansion 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 shows a schematic diagram of a single DC source chassis according to an embodiment of the present invention;

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

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 making creative efforts shall fall 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 configured to provide n+1 reference voltages, n reference voltages are input into the n conversion units, and the n reference voltages are converted into n analog signals (i.e., voltage signals) in digital form. The remaining 1 reference voltage is used as a reference voltage of the temperature acquisition module to provide a calibration parameter of the analog signal, wherein n and n are positive integers greater than 0, and n is a multiple of n.

[0051] 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 buffer output of the reference voltages, respectively, so as to improve the driving capability of each reference voltage and reduce mutual interference between the n+1 reference voltages. Figure 2

[0052] As shown, the conversion units include digital-to-analog converters (DACs), each of the DACs receives a reference voltage output by one of the first operational amplifiers and converts the reference voltage into an analog signal through a corresponding digital interface and an instruction of a bus controller (for example, an SPI bus controller). Figure 1 In this embodiment, the DACs are implemented by AD5791 of ADI (Analog Devices, Inc.) with the highest number of bits. The DAC of AD5791 type has a resolution of 1ppm and a temperature drift characteristic of 0.05ppm / ℃, and the error of the DAC output in actual application is mainly caused by the reference voltage drift due to the change of the 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 multiple resistance acquisition units. Exemplarily, the micro-control unit uses a microcontroller MCU (Micro Controller Unit), and the resistance acquisition unit uses a thermistor whose resistance value is extremely sensitive to temperature. Exemplarily, 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 microcontroller MCU) obtains the voltage values ​​corresponding to the multiple resistance values ​​based on 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 a temperature change value relative to the initial temperature based on the temperature average value (i.e., 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: DAC output voltage change value = temperature change value * voltage reference temperature drift coefficient * initial DAC output voltage). Based on the voltage change value of the DAC output and the difference between the initial DAC output voltage, the corresponding DAC is reconfigured to calibrate the output voltage of each DAC that has changed. The reconfiguration method is as follows: the voltage change value corresponding to the minimum value of the DAC input digital quantity is defined as x uV, the difference is divided by x uV and rounded to obtain a compensation value, the initial DAC input digital quantity is subtracted from the compensation value to obtain a new input digital quantity, and the DAC is configured to obtain the calibrated DAC output voltage corresponding to the new input digital quantity. An example is given below to illustrate:

[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 0~1048575 (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 decreases by 1, the DAC output voltage decreases by 19uV, set the input digital value 524288 (2 19 ) when the output voltage is 0. Initially at 25°C, set the corresponding DAC (such as Figure 1DAC1) input digital quantity 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, increases 150uV, the MCU will report the temperature data (such as the temperature data of 28℃) tested to the bus controller through the bus, and the bus controller sets the value of the corresponding DAC to decrease 8 (150 / 19 is rounded) and reconfigures, that is, reconfigures the DAC to correspond to the new digital input quantity 917496 (917504-8=917496), so as to output the actual 7.5V voltage, the error is less than 10uV, and the calibration purpose is achieved.

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

[0057] In some embodiments of the present application, the current detection module includes a second amplification unit and a measurement unit, wherein the second amplification unit collects the output voltage of the second operational amplifier through a sampling resistor and performs differential amplification, and the measurement unit is used for voltage measurement of the output signal of the second amplification unit. Figure 3As shown, the second amplification unit includes a third operational amplifier IAMP (Instrumentation Amplifier), each of which collects the output voltage amplified by the second operational amplifier through a sampling resistor and performs differential amplification. The measurement unit includes an analog-to-digital converter ADC (Analog to Digital Converter) for converting the voltage analog signal after differential amplification by the third operational amplifier into a digital signal and inputting it to the corresponding digital interface, and inputting it to the bus controller through the bus interface, so that the bus controller obtains the current value through the control end PC to read as the voltage source working state judgment reference of the current channel output. In this embodiment, when n is 16, the ADC can be set to convert 16 differential amplified voltage analog signals into 1 digital signal, and after inputting 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 instrument amplifier output, and the instrument amplifier (i.e. the third operational amplifier) is set to 1000 times the amplification factor, and a 24-bit ADC is used for voltage measurement, which can obtain a measurement accuracy of 100nA.

[0058] In some embodiments of the application, 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, by integrating the digital-to-analog conversion module, the current detection module and the high-voltage amplification module on a voltage source board of an integrated module, thereby finally forming an 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 application, a single integrated module can be expanded by an expansion module, i.e. the application also includes an expansion module, wherein, as shown, Figure 4 As shown, the expansion module includes a backboard and a control board, wherein a plurality of bus interfaces are integrated on the backboard, and a bus controller is integrated on the control board. The digital interfaces of the voltage source boards in the integrated module are connected to the bus interfaces on the backboard, and the bus interfaces are connected to the bus controller in parallel, thereby forming an n-channel high-precision voltage source.

[0060] Based on this, in some other embodiments of the application, the expansion module can also be expanded to form a high-precision voltage source with more channels, as shown, Figure 5As shown, the digital interfaces of the voltage source boards in the m integrated modules are connected with the m bus interfaces on the back plate respectively, and when m and n are both 16, 16*16=256 channels of high-precision voltage sources can be finally formed, wherein m is a positive integer greater than 0.

[0061] In some embodiments of the present application, as shown, Figure 6 As shown, the expansion module further comprises a control terminal PC, which is connected to the bus controller on the control board through Ethernet, and m * n (for example, when m and n are both 16, then 16*16=256) channels of high-precision voltage sources can be installed in a DC source cabinet, so as to be used by quantum devices, and as shown, Figure 7 As shown, it can also pass through an Ethernet switch, so that through the control terminal PC, a plurality of DC source cabinets are driven, and n * channels of high-precision voltage sources are expanded.

[0062] Based on this, in the case where n is 16, the control part can configure 16 channels of DAC through the bus controller, and output the expected power supply voltage; the 20-bit DAC output is ±10, which is amplified by 10 times through the HVAMP (i.e. the second operational amplifier), and the output range can be set to the output of the DAC (±10V) or the output of the second operational amplifier (±100V) by controlling the switching of the analog switch, and the output is ±100V. After the control terminal PC configures the voltage, 20-bit data is configured to the DAC through the bus controller calculation. 0-2 19 corresponding to the 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 resistance is 1Ω, the voltage generated by the current I is I*1=I, and after being amplified by 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 application adopts modular design, and a single voltage source board outputs at most n (for example, n is 16, and 16 channels) DC voltage sources. The system adopts a bus control scheme, the control board and the voltage source board are interconnected through the bus of the backboard, and the 3U chassis form device outputs at most 256 (when m and n are both 16) high-precision DC voltage sources. The control end PC is connected to the control board through Ethernet, and the output of the DC voltage source is controlled, and the corresponding number of DC voltage sources is output according to the system requirements. A plurality of voltage source devices can be controlled through the network, and more channels, for example, more than 2048 high-precision DC sources, can be expanded.

[0066] In another aspect, in some embodiments of the application, a method for generating a multi-channel voltage source is also provided, the method comprising:

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

[0068] All analog signals are amplified and input into the DC electrode in the ion trap by using a high-voltage amplification module, wherein the high-voltage amplification module comprises n first amplification units;

[0069] The digital-to-analog conversion module and the high-voltage amplification module are integrated by using an integration module, wherein the integration module comprises a voltage source board, 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 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;

[0070] The multi-channel expansion of the high-precision voltage source is performed by using an expansion module, wherein the expansion module comprises a backboard, a control board and a control end PC, the backboard integrates a plurality of bus interfaces, the control board integrates a bus controller, the digital interfaces of the voltage source boards in the plurality of integrated modules are respectively connected to the plurality of bus interfaces on the backboard, and the plurality of bus interfaces are connected to the bus controller in parallel; the control end PC is connected to the bus controller on the control board through Ethernet.

[0071] The output signal passing through the high-voltage amplification module is sampled and voltage measurement is performed by using the current detection module.

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

[0073] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments as above, it is not intended to limit the present application. Any person skilled in the art can make some minor changes or modifications to the disclosed technical content without departing from the scope of the technical solution of the present application, and any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the scope of the technical solution of the present application.

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 configured to provide n+1 reference voltages, the n reference voltages being input into the n conversion units, and the digital signals of the n reference voltages being converted into n analog signals. The remaining 1 reference voltage is used as a reference voltage for the temperature acquisition module to provide calibration parameters for the analog signals, wherein n is a positive integer greater than 0; A high-voltage amplification module, comprising n first amplification units, configured to amplify all analog signals and then input 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 to the multiple bus interfaces on the backplane, and the multiple bus interfaces are connected in parallel to the bus controller; the control-end PC is connected to the bus controller on the control board via Ethernet; The bus controller is configured to calibrate the output voltages of the conversion units that have changed based on the temperature change value, the temperature drift coefficient of the voltage reference, and the initial output voltages of the conversion units, including: calculating the voltage change value output by the conversion unit based on the temperature change value, the temperature drift coefficient of the voltage reference, and the initial output voltages of the conversion units; and reconfiguring the corresponding conversion unit based on the difference between the voltage change value output by the conversion unit and the output voltage of the corresponding initial conversion unit to calibrate the output voltages of the conversion units that have changed; wherein the reconfiguration is performed in the following manner: The voltage change value corresponding to the minimum value of the input digital quantity of the conversion unit is defined as x uV; Divide the difference by x uV and round it to get the compensation value, subtract the compensation value from the initial input digital quantity of the conversion unit to get a new input digital quantity, and configure the conversion unit to correspond to the new input digital quantity to get the output voltage of the calibrated conversion unit.

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 output of 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. Every n digital-to-analog converters respectively receive the reference voltage output by the n first operational amplifiers, and receive 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 includes a second operational amplifier, wherein: Each second operational amplifier amplifies the analog signal converted by the 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. The multi-channel voltage source according to claim 4, characterized in that: The voltage source further includes a current detection module, which 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. The 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 the output voltage amplified by one second operational amplifier through a sampling resistor and performs differential amplification.

7. The 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, among which, 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 ​​based on the remaining reference voltage, calculates the real-time temperature corresponding to the voltage value, obtains the average temperature, and inputs it to the bus controller.

9. The multi-channel voltage source according to claim 8, characterized in that: The bus controller also obtains a temperature change value relative to the 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 method for generating a multi-channel voltage source, characterized in that: The method comprises: Utilize a digital-to-analog conversion module 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, and the digital signals of the n reference voltages are converted into n analog signals, with the remaining 1 being used as a reference voltage for 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 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; The expansion module is used to expand the multi-channels of the high-precision voltage source. The expansion module includes a backplane, a control board, and a control-end PC. The backplane integrates multiple bus interfaces, the control board integrates 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 in parallel to the bus controller. The control-end PC is connected to the bus controller on the control board via Ethernet. The bus controller calibrates the output voltages of the conversion units that have changed based on the temperature change value, the temperature drift coefficient of the voltage reference, and the initial output voltages of the conversion units, including: calculating the voltage change value output by the conversion unit based on the temperature change value, the temperature drift coefficient of the voltage reference, and the initial output voltages of the conversion units; and reconfiguring the corresponding conversion unit based on the difference between the voltage change value output by the conversion unit and the output voltage of the corresponding initial conversion unit to calibrate the output voltages of the conversion units that have changed; wherein the reconfiguration is performed in the following manner: The voltage change value corresponding to the minimum value of the input digital quantity of the conversion unit is defined as x uV; Divide the difference by x uV and round it to get the compensation value, subtract the compensation value from the initial input digital quantity of the conversion unit to get a new input digital quantity, and configure the conversion unit to correspond to the new input digital quantity to get the output voltage of the calibrated conversion unit.

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