CN111913020A - Low-noise bias source for quantum alternating-current voltage system and using method - Google Patents
Low-noise bias source for quantum alternating-current voltage system and using method Download PDFInfo
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Abstract
The invention discloses a low-noise bias source for a quantum voltage system and a using method thereof, relates to the technical field of bias sources, and aims to solve the problem that the quantum alternating voltage in the prior art has long rise time and affects the accuracy of the quantum alternating voltage. Wherein the low noise bias source comprises: the circulating control module is electrically connected with the high-speed D/A array and starts or stops working according to the received control signal; when the high-speed D/A array works, the high-speed D/A array is driven to work circularly according to a control word output by the received quantum alternating voltage and a data list for driving the voltage output of the high-speed D/A array; the high-speed D/A array circularly outputs a driving signal according to the control word and the data list; and the power supply module is used for supplying power to the circulation control module and the high-speed D/A array. The rise time of the quantum alternating voltage is reduced, and the influence of the rise time on the accuracy of the synthesized quantum alternating voltage is reduced.
Description
Technical Field
The invention relates to the technical field of bias sources, in particular to a low-noise bias source for a quantum alternating-current voltage system and a using method thereof.
Background
The programmable Josephson quantum voltage standard can realize the output of direct current quantum voltage and the output of alternating current voltage through dynamic scanning, is used as the highest standard to carry out magnitude transmission on alternating current and direct current voltage parameters, and has wide application in the aspects of electrical metering, aerospace and high-end measurement of alternating current and direct current voltages of weapon systems. The bias source is an important component in the quantum alternating current/direct current voltage standard and is used for providing a bias signal for the superconducting device-superconducting array junction and driving the superconducting device-superconducting array junction to generate a required quantum voltage step under the liquid helium environment and microwave irradiation.
The bias source used for the quantum voltage system in the past is a bias current source, the output current of the bias current source is adjusted in advance, and the superconducting array junction is driven by controlling the switching and reversing of the switch unit so as to output the preset quantum voltage. The switch element used by the existing switch unit is a solid-state switch, the rise time of the solid-state switch is about 100 nanoseconds, and the current needs to flow through the two solid-state switches for switching on and off and reversing during control, so the rise time of the quantum alternating-current voltage reaches hundreds of nanoseconds, and the accuracy of the synthesized quantum alternating-current voltage is influenced.
Disclosure of Invention
The invention aims to provide a low-noise bias source for a quantum alternating-current voltage system and a using method thereof, which reduce the noise of an output signal, improve the stability of driving a superconducting array junction to output a quantum alternating-current voltage signal, and solve the technical problems that in the prior art, the on-resistance can generate heat when current flows, so that the temperature is increased, the on-resistance can also change, so that the driving current is unstable, and the stability of quantum synthetic alternating-current voltage is influenced.
In order to achieve the above purpose, the invention provides the following technical scheme:
a low noise bias source for a quantum voltage system, comprising: the system comprises a cycle control module, a high-speed D/A array and a power supply module;
the circulation control module is electrically connected with the high-speed D/A array and starts or stops working according to the received control signal; when the high-speed D/A array works, the high-speed D/A array is driven to work in a circulating mode according to control words output by received quantum alternating-current voltage and a data list for driving the voltage output of the high-speed D/A array;
the high-speed D/A array circularly outputs a driving signal according to the control word and the data list;
and the power supply module supplies power to the circulation control module and the high-speed D/A array.
Compared with the prior art, the low-noise bias source for the quantum voltage system adopts the bias voltage source to drive the superconducting array to combine into an alternating-current voltage signal, adopts the circulation control module to directly control the high-speed D/A array to generate corresponding bias voltage, avoids the situation that a bias current is generated through a first-stage high-speed amplification unit and then drives the superconducting array junction, improves the control speed, and reduces the rise time under the bias current source control mode to one hundred nanoseconds to ten nanoseconds. The superconducting array junction is driven by a high-speed voltage signal, the rising time of the superconducting array junction can reach within ten nanoseconds, and the influence of the rising time on the accuracy of the synthesized quantum alternating-current voltage is effectively reduced.
The invention also provides a use method of the low-noise bias source for the quantum voltage system, which comprises the following steps:
the power supply module respectively supplies power to the cycle control module, the digital part of the high-speed D/A array and the analog part of the high-speed D/A array;
the circulation control module starts working according to the received control signal;
according to the received quantum alternating voltage output control word and the data list for driving the high-speed D/A array voltage output, circularly driving the high-speed D/A array to work;
and the high-speed D/A array circularly outputs a driving signal according to the control word and the data list.
Compared with the prior art, the using method of the low-noise bias source for the quantum voltage system provided by the invention has the same beneficial effects as the ultra-long free evolution time-cooled atomic frequency standard device in the technical scheme, and the description is omitted here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic block diagram of a low noise bias source for a quantum voltage system in an embodiment of the present invention;
fig. 2 is a schematic flow chart of a method for using a low noise bias source for a quantum voltage system in an embodiment of the invention.
Reference numerals:
the system comprises a chassis 1, a cycle control module 2, a high-speed D/A array 3, a data storage module 4, a power supply module 5, a synchronous control interface 6, an output interface 7 and an optical fiber communication interface 8.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
With particular reference to fig. 1, the present invention provides a low noise bias source for a quantum voltage system, comprising: a cycle control module 2, a high-speed D/A array 3 and a power supply module 5;
the circulation control module 2 is electrically connected with the high-speed D/A array 3 and starts or stops working according to the received control signal; when the high-speed D/A array works, the high-speed D/A array 3 is driven to work circularly according to the received control words output by the quantum alternating voltage and the data list for driving the voltage output of the high-speed D/A array 3;
the high-speed D/A array 3 outputs a driving signal circularly according to the control word and the data list;
and the power supply module 5 is used for supplying power to the circulation control module 2 and the high-speed D/A array 3.
In the specific implementation:
the bias source for the quantum voltage system is realized by adopting a voltage control technology, the working principle is that driving voltages are provided at different input nodes of the superconducting array junction, and the voltage difference between the nodes can realize corresponding currents between the different nodes, so that the superconducting array junction is driven to output the required quantum voltage. The voltage type bias source adopts the high-speed D/A array 3 to generate voltages required by different input nodes of the superconducting array junction, can realize higher speed, reduces the rise time of the synthesized quantum voltage waveform to about 10 nanoseconds, and effectively improves the accuracy of the quantum alternating voltage. Meanwhile, the noise of the high-speed voltage driving signal influences the stability of the quantum synthesis alternating voltage, so that the voltage control speed is improved, and simultaneously, the voltage output noise is restrained so as to drive the array junction to generate a stable high-accuracy quantum voltage signal.
Compared with the prior art, the low-noise bias source for the quantum voltage system adopts the bias voltage source to drive the superconducting array to combine into an alternating-current voltage signal, adopts the circulation control module to directly control the high-speed D/A array to generate corresponding bias voltage, avoids the situation that a bias current is generated through a first-stage high-speed amplification unit and then drives the superconducting array junction, improves the control speed, and reduces the rise time under the bias current source control mode to one hundred nanoseconds to ten nanoseconds. The superconducting array junction is driven by a high-speed voltage signal, the rising time of the superconducting array junction can reach within ten nanoseconds, and the influence of the rising time on the accuracy of the synthesized quantum alternating-current voltage is effectively reduced.
As an implementable manner, the low noise bias source further comprises:
the data storage module 4 is electrically connected with the circulation control module 2 and the power supply module 5 and is connected with an upper computer through an optical fiber communication interface 8;
and storing the control word and the data list output by the upper computer.
Through the storage of the control word and the data list, the reading of the data stored in the data storage module 4 by the circulation control module 2 is facilitated, the data acquisition is more direct, the acquired data is more accurate, and the data transmission time is reduced.
As an implementation, the loop control module 2 receives a control signal through the synchronous control interface 6;
when the digital signal processing device works, the control words stored in the data storage module 4 are read, the data list is read circularly according to the control words, and the read digital signals are sent to the high-speed D/A array 3.
Further, the high-speed D/a array 3 converts the received digital signal into an analog signal and outputs the analog signal. The output analog signal is output through the output interface 7.
The cycle control module 2 reads the data list stored in the data storage module 4 according to the control word in a cycle manner, so that the reading is simpler and quicker, the stored data is read in a cycle manner, the data communication with an upper computer is reduced, the data acquisition is more accurate, and the occurrence of error conditions caused by repeated communication with the upper computer for multiple times is avoided.
As an implementation, the power module 5 uses two-way power supply to supply power to the digital parts of the circulation control module 2 and the high-speed D/a array 3 and to supply power to the analog parts of the high-speed D/a array 3.
The power module 5 adopts a double-path digital-analog isolation power supply mode, effectively reduces the noise of output signals, and improves the stability of quantum alternating voltage signals output by the driving superconducting array junction.
In one embodiment, the cycle control module 2, the high-speed D/a array 3, the power module 5, and the data storage module 4 are disposed in the chassis.
The circulation control module 2, the high-speed D/A array 3, the power supply module 5 and the data storage module 4 are placed in the case, so that the interference of external signals is avoided, and the accuracy of final output data is ensured.
With particular reference to fig. 2, the present invention provides a method for using a low noise bias source for a quantum voltage system, which applies the low noise bias source for the quantum voltage system, and the method for using the low noise bias source comprises:
the power supply module respectively supplies power to the cycle control module, the digital part of the high-speed D/A array and the analog part of the high-speed D/A array;
the circulation control module starts working according to the received control signal;
according to the received quantum alternating voltage output control word and the data list for driving the high-speed D/A array voltage output, circularly driving the high-speed D/A array to work;
and the high-speed D/A array outputs driving signals circularly according to the control words and the data list.
Compared with the prior art, the low-noise bias source for the quantum voltage system adopts the bias voltage source to drive the superconducting array to combine into an alternating-current voltage signal, adopts the circulation control module to directly control the high-speed D/A array to generate corresponding bias voltage, avoids the situation that a bias current is generated through a first-stage high-speed amplification unit and then drives the superconducting array junction, improves the control speed, and reduces the rise time under the bias current source control mode to one hundred nanoseconds to ten nanoseconds. The superconducting array junction is driven by a high-speed voltage signal, the rising time of the superconducting array junction can reach within ten nanoseconds, and the influence of the rising time on the accuracy of the synthesized quantum alternating-current voltage is effectively reduced.
As an implementation manner, before cyclically driving the high-speed D/a array to operate, the cyclic control module, according to the received quantum alternating voltage output control word and the data list of the voltage output of the driving high-speed D/a array, further includes:
and the data storage module stores the control word and the data list output by the upper computer.
Through the storage of the control word and the data list, the reading of the data stored in the data storage module by the circulation control module is facilitated, the data acquisition is more direct, the acquired data is more accurate, and the data transmission time is reduced.
As an implementation, the loop control module outputs a control word and a data list for driving the voltage output of the high-speed D/a array according to the received quantum alternating voltage, and includes:
the cycle control module reads the control word and the data list stored in the data storage module;
circularly reading the data list according to the control word, and sending the read digital signal to the high-speed D/A array;
the high-speed D/A array converts the digital signals into analog signals for output.
The cycle control module reads the data list stored in the data storage module according to the control word in a cycle manner, so that the reading is simpler and quicker, the stored data is read in a cycle manner, the data communication with an upper computer is reduced, the data acquisition is more accurate, and the occurrence of error conditions caused by repeated communication with the upper computer for multiple times is avoided.
In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A low noise bias source for a quantum voltage system, comprising: the system comprises a cycle control module, a high-speed D/A array and a power supply module;
the circulation control module is electrically connected with the high-speed D/A array and starts or stops working according to the received control signal; when the high-speed D/A array works, the high-speed D/A array is driven to work in a circulating mode according to control words output by received quantum alternating-current voltage and a data list for driving the voltage output of the high-speed D/A array;
the high-speed D/A array circularly outputs a driving signal according to the control word and the data list;
and the power supply module supplies power to the circulation control module and the high-speed D/A array.
2. The low noise bias source for a quantum voltage system of claim 1, further comprising: a data storage module;
the circulation control module is electrically connected with the power supply module and is connected with an upper computer through an optical fiber communication interface;
and storing the control word and the data list output by the upper computer.
3. The low-noise bias source for the quantum voltage system as claimed in claim 2, wherein the cyclic control module is connected with an upper computer through a synchronous control interface to receive the control signal;
when the high-speed D/A array works, the control words stored in the data storage module are read, the data list is read circularly according to the control words, and the read digital signals are sent to the high-speed D/A array.
4. The low noise bias source for quantum voltage system of claim 3, wherein said high speed D/A array converts received digital signals to analog signal output.
5. The low noise bias source for quantum voltage systems of claim 2, wherein the cyclic control module, the high speed D/a array, the power module, and the data storage module are all disposed within a chassis.
6. The low noise bias source for quantum voltage system of claim 1, wherein said power module, using dual power supply, powers said cyclic control module and digital part of said high speed D/a array and analog part of said high speed D/a array, respectively.
7. Use of a low noise bias source for a quantum voltage system, characterized in that the low noise bias source for a quantum voltage system of any of claims 1 to 6 is applied, comprising:
the power supply module respectively supplies power to the cycle control module, the digital part of the high-speed D/A array and the analog part of the high-speed D/A array;
the circulation control module starts working according to the received control signal;
according to the received quantum alternating voltage output control word and the data list for driving the high-speed D/A array voltage output, circularly driving the high-speed D/A array to work;
and the high-speed D/A array circularly outputs a driving signal according to the control word and the data list.
8. The method for using the low noise bias source for the quantum voltage system as claimed in claim 7, wherein the cycling control module cycles the high speed D/a array according to the received quantum ac voltage output control word and the data list of the voltage output of the high speed D/a array, before the cycling the high speed D/a array, further comprising:
and the data storage module stores the control word and the data list output by the upper computer.
9. The method of claim 8, wherein the cyclic control module outputs a control word and a datalist driving a high speed D/a array voltage output according to the received quantum ac voltage, comprising:
the cycle control module reads the control word and the data list stored in the data storage module;
and circularly reading the data list according to the control word, and sending the read digital signals to the high-speed D/A array.
10. The method of claim 9, wherein the high speed D/a array cyclically outputs drive signals according to the control word and the data list, comprising:
the high-speed D/A array converts the digital signals into analog signals for output.
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