CN218512855U - Circuit of low-noise current source and low-noise current source - Google Patents
Circuit of low-noise current source and low-noise current source Download PDFInfo
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Abstract
The application discloses circuit and low noise current source of low noise current source belongs to quantum spin magnetometer technical field. The circuit of the low noise current source of the present application comprises: a main control module; a reference source module for outputting a reference voltage; the input end of the digital-to-analog conversion module is respectively and electrically connected with the output end of the main control module and the output end of the reference source module, and the digital-to-analog conversion module is used for filtering the converted voltage and outputting a first voltage; the input end of the constant current source module is electrically connected with the output end of the digital-to-analog conversion module, the constant current source module is used for converting a first voltage into a low-noise current, magnetic cancellation precision is improved, the quantum spin magnetometer reaches a spin-free exchange relaxation area, and the constant current source module is used for providing a feedback signal for the digital-to-analog conversion module, so that constant current output is achieved.
Description
Technical Field
The application belongs to the technical field of quantum spin magnetometers, and particularly relates to a circuit of a low-noise current source and the low-noise current source.
Background
With the development and progress of modern science and technology, quantum magnetic measurement is widely applied to various fields such as biomedicine, geophysical, space exploration, military and national defense, and the like. In order to achieve a non-spin exchange relaxation region, the quantum spin magnetometer adopts a cancellation coil to compensate an environmental magnetic field, the noise of a driving current source of the cancellation coil directly determines the detection lower limit of the quantum spin magnetometer, and the resolution of the current source determines the magnetic cancellation precision, so that the magnetic resonance line width is influenced, and the system noise level is further reflected. But the noise in the current provided by current conventional current sources is high.
SUMMERY OF THE UTILITY MODEL
The present application is directed to solving at least one of the problems in the prior art. To this end, the present application proposes a low noise current source circuit and a low noise current source for providing ultra low noise current for quantum spin magnetometers to reach a spin-exchange free relaxation region.
In a first aspect, the present application provides a circuit of a low noise current source, comprising:
a main control module;
a reference source module for outputting a reference voltage;
the digital-to-analog conversion module is used for converting the digital signal into an analog signal, filtering the converted voltage and outputting a first voltage;
the constant current source module is used for converting the first voltage into low-noise current and providing a feedback signal for the digital-to-analog conversion module.
According to the circuit of the low-noise current source provided by the embodiment of the application, the digital-to-analog conversion module is used for filtering the output voltage to obtain the first voltage, so that the noise in the voltage input to the constant current source module can be reduced; on the basis of converting the first voltage into the low-noise current, the constant current source module can also generate the feedback signal for controlling the output voltage of the digital-to-analog conversion module based on the current so as to realize signal closed loop, thereby improving the magnetic cancellation precision, widening the detection lower limit of the quantum spin magnetometer in the subsequent use process, and enabling the quantum spin magnetometer to reach a spin-exchange-free relaxation region.
In an embodiment of the present application, the digital-to-analog conversion module includes:
the input end of the digital-to-analog converter is respectively and electrically connected with the output end of the main control module and the output end of the reference source module;
the input end of the first filter is electrically connected with the output end of the digital-to-analog converter, and the output end of the first filter is electrically connected with the input end of the constant current source module.
According to the circuit of the low-noise current source, the first filter is arranged in the digital-to-analog conversion module to perform noise reduction on the voltage converted by the digital-to-analog converter, so that the low-noise voltage is output to the constant current source module to reduce the noise in the finally output current, the detection lower limit of the quantum spin magnetometer is widened, the magnetic cancellation precision is improved, and the quantum spin magnetometer reaches a spin-exchange-free relaxation region.
In one embodiment of the present application, the reference source module includes:
a reference source unit;
the second filter is electrically connected between the reference source unit and the digital-to-analog conversion module.
According to the circuit of the low-noise current source in one embodiment of the application, the second filter is arranged in the reference source module to perform noise reduction processing on the reference voltage output by the reference source unit, so that the low-noise reference voltage is output to the digital-to-analog conversion module to reduce noise in the finally output current, a current with lower noise is provided for the cancellation coil, the detection lower limit of the quantum spin magnetometer is widened, and the quantum spin magnetometer reaches a spin-exchange-free relaxation region.
In the low-noise current source circuit of one embodiment of the present application, the constant current source module includes a sampling resistor, and the sampling resistor is connected in parallel with the target capacitor.
According to the circuit of the low-noise current source, the target capacitor is connected in parallel to two ends of the sampling resistor, so that noise in current converted by the sampling resistor is reduced, and noise in finally output current is reduced.
The circuit of low noise current source of an embodiment of this application, constant current source module includes feedback circuit, feedback circuit's input with sampling resistor connects, feedback circuit's output with the host system electricity is connected, feedback circuit sets up to confirm based on the target current of constant current source module output feedback signal.
According to the circuit of the low-noise current source, by arranging the feedback circuit, the constant current source module can provide the feedback signal for the digital-to-analog conversion module so as to realize signal closed loop, improve magnetic cancellation precision and reduce noise in finally output current.
The circuit of the low-noise current source according to an embodiment of the present application further includes a communication module electrically connected between the main control module and the reference source module.
The communication module comprises at least one communication channel, and the communication channels are arranged in an isolated mode.
According to the circuit of the low-noise current source, the communication channels are arranged in an isolation mode, signals input to the communication module by the main control module can be isolated, mutual interference among the signals of the communication channels is reduced, and noise in finally output current is further reduced.
In a second aspect, the present application provides a low noise current source comprising:
a base plate;
a circuit of a low noise current source as described in the first aspect;
the circuit of the low-noise current source is arranged on the bottom plate, and the reference source module is arranged in a thermal isolation mode with the digital-to-analog conversion module.
According to the low-noise current source provided by the embodiment of the application, the reference source module and the digital-to-analog conversion module are thermally isolated, the base plate around the reference source module is provided with the grooves, the shielding cover is arranged outside the reference source module, and the low-noise current source can output ultra-low noise current.
One or more technical solutions in the embodiments of the present application have at least one of the following technical effects:
the digital-to-analog conversion module is used for filtering the output voltage to obtain a first voltage, so that the noise in the voltage input to the constant current source module can be reduced; on the basis of converting the first voltage into low-noise current, the constant current source module can also generate a feedback signal for controlling the output voltage of the digital-to-analog conversion module based on the current so as to realize signal closed loop and improve magnetic cancellation precision, so that the detection lower limit of the quantum spin magnetometer is widened in the subsequent use process, and the quantum spin magnetometer reaches a spin-exchange-free relaxation region.
Further, a first filter is arranged in the digital-to-analog conversion module to perform noise reduction processing on the voltage converted by the digital-to-analog converter, so that a low-noise voltage is output to the constant current source module.
Further, a second filter is provided in the reference source module to perform noise reduction processing on the reference voltage output by the reference source unit, thereby outputting a low-noise reference voltage to the digital-to-analog conversion module.
Furthermore, the target capacitor is connected in parallel to the two ends of the sampling resistor, so that noise in the current converted by the sampling resistor is reduced, and the noise in the finally output current is reduced.
Furthermore, by arranging the feedback circuit, the constant current source module can provide a feedback signal for the digital-to-analog conversion module so as to realize signal closed loop, improve magnetic cancellation precision, reduce noise in the finally output current, provide a current with lower noise for the cancellation coil and enable the quantum spin magnetometer to reach a spin-exchange-free relaxation region.
Furthermore, the communication channels are arranged in an isolated manner, so that signals input to the communication module by the main control module can be isolated, mutual interference among the signals of the communication channels is reduced, and noise reduction is further realized.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a circuit of a low-noise current source according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a low-noise current source according to an embodiment of the present disclosure.
Reference numerals are as follows:
110: an upper computer; 120: a main control module;
130: a digital-to-analog conversion module; 131: a digital-to-analog converter; 132: a first filter;
140: a constant current source module;
150: a reference source module; 151: a reference source unit; 152: a second filter;
210: a program-controlled power supply; 220: a printed circuit board; 230: a phase-locked amplifier; 240: a low noise current source.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative and are only for the purpose of explaining the present application and are not to be construed as limiting the present application.
1. In the description of the present application, it is to be understood that the terms "inner", "outer", "axial", "radial", "circumferential", and the like, as used herein, refer to an orientation or positional relationship as shown in the drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus is not to be considered as limiting.
2. In the description of the present application, "a plurality" means two or more.
A circuit of a low noise current source according to an embodiment of the present application is described below with reference to fig. 1.
As shown in fig. 1, the circuit of the low noise current source includes: a main control module 120, a digital-to-analog conversion module 130, a constant current source module 140 and a reference source module 150.
In this embodiment, the main control module 120 is responsible for information concentration, storage, analysis and decision-making of other respective modules.
The digital-to-analog conversion module 130 can be used to convert the digital signal into an analog signal to convert into a voltage.
The digital-to-analog conversion module 130 can be further configured to perform filtering processing on the converted voltage, and reduce noise in the converted voltage to output the first voltage.
The input end of the digital-to-analog conversion module 130 is electrically connected with the output end of the main control module 120.
The digital-to-analog conversion module 130 can filter noise in the converted voltage, thereby reducing noise in the generated first voltage.
The input end of the constant current source module 140 is electrically connected to the output end of the digital-to-analog conversion module 130.
The constant current source module 140 is configured to convert the first voltage into a low noise current.
The low-noise current is used for providing current for a cancellation coil used by the quantum spin magnetometer when the magnetic measurement system is detected.
The constant current source module 140 can also be used to provide a feedback signal to the digital-to-analog conversion module 130.
The feedback signal is used to control the digital-to-analog conversion module 130 to output the first voltage based on the target current output by the constant current source module 140.
The reference source module 150 is configured to output a reference voltage.
The reference voltage is used as the threshold voltage of the digital-to-analog conversion module 130.
In an actual implementation process, when the first voltage output by the digital-to-analog conversion module 130 does not exceed the threshold voltage, the digital-to-analog conversion module 130 works normally; conversely, when the first voltage output by the analog-to-digital conversion module 130 exceeds the threshold voltage, the digital-to-analog conversion module 130 will continue to adjust the output first voltage according to the feedback signal until the first voltage does not exceed the threshold voltage.
According to the circuit of the low-noise current source provided by the embodiment of the application, the digital-to-analog conversion module 130 performs filtering processing on the output voltage to obtain a first voltage, so that noise in the voltage input to the constant current source module 140 can be reduced; on the basis of converting the first voltage into a low-noise current, the constant current source module 140 may further generate a feedback signal for controlling the output voltage of the digital-to-analog conversion module 130 based on the current, so as to implement signal closed loop and improve magnetic cancellation accuracy, so that in a subsequent use process, a detection lower limit of the quantum spin magnetometer is widened, and the quantum spin magnetometer reaches a spin exchange relaxation-free region.
In some embodiments, the digital-to-analog conversion module 130 includes: a digital-to-analog converter 131 and a first filter 132.
In this embodiment, the input terminals of the digital-to-analog converter 131 are electrically connected to the output terminal of the main control module 120 and the output terminal of the reference source module 150, respectively.
An input end of the first filter 132 is electrically connected to an output end of the digital-to-analog converter 131, and an output end of the first filter 132 is electrically connected to an input end of the constant current source module 140.
The first filter 132 is configured to perform filtering processing on the converted voltage to reduce noise and output a first voltage.
According to the circuit of the low-noise current source provided by the embodiment of the application, the first filter 132 is arranged in the digital-to-analog conversion module 130 to perform noise reduction processing on the voltage converted by the digital-to-analog converter 131, so that the low-noise voltage is output to the constant current source module 140.
In some embodiments, the reference source module 150 includes: a reference source unit 151 and a second filter 152.
In this embodiment, the output terminal of the reference source unit 151 is electrically connected to the input terminal of the second filter 152;
the output of the second filter 152 is electrically connected to the digital-to-analog conversion module 130.
The second filter 152 is configured to perform noise reduction processing on the reference voltage output by the reference source unit 151.
According to the circuit of the low noise current source provided by the embodiment of the application, the second filter 152 is arranged in the reference source module 150 to perform noise reduction processing on the reference voltage output by the reference source unit 151, so as to output the low noise reference voltage to the digital-to-analog conversion module 130.
In some embodiments, the constant current source module 140 includes: the resistance is sampled.
In this embodiment, the sampling resistor is used to convert the first voltage output by the digital-to-analog conversion module 130 into a current.
In some embodiments, the sampling resistor is also connected in parallel with the target capacitance.
The parameters of the target capacitance can be user-defined or can be determined based on the degree of filtering.
The parallel target capacitor is used for filtering noise in the current converted by the sampling resistor so as to further reduce the noise in the finally output current.
According to the circuit of the low-noise current source provided by the embodiment of the application, the target capacitor is connected in parallel to the two ends of the sampling resistor, so that the noise in the current converted by the sampling resistor is reduced, and the noise in the finally output current is reduced.
In some embodiments, the constant current source module 140 further comprises: a feedback circuit.
In this embodiment, the input terminal of the feedback circuit is connected to the sampling resistor, and the output terminal of the feedback circuit is electrically connected to the main control module 120.
The feedback circuit is configured to determine a feedback signal based on the target current output by the constant current source module 140.
According to the circuit of the low-noise current source provided by the embodiment of the application, by setting the feedback circuit, the constant current source module 140 can provide a feedback signal to the digital-to-analog conversion module 130 to realize signal closed loop, improve magnetic cancellation precision, and enable the quantum spin magnetometer to reach a spin-free exchange relaxation region.
In some embodiments, the circuit of the low noise current source further comprises: and a communication module.
In this embodiment, the communication module is used to implement communication between the master control module 120 and the reference source module 150.
The communication module is electrically connected between the main control module 120 and the reference source module 150.
In some embodiments, the communication module includes at least one communication channel, each communication channel being disposed in isolation from each other.
The number of communication channels can be user-defined or can be determined based on the degree to which interference is shielded.
According to the circuit of the low-noise current source provided by the embodiment of the application, the communication channels are isolated from each other, so that signals input to the communication module by the main control module 120 can be isolated, mutual interference among the signals of the communication channels is reduced, and noise reduction is further realized.
In some embodiments, the circuit of the low noise current source further comprises: the output end of the upper computer 110 is electrically connected with the input end of the main control module 120.
The application also provides a low-noise current source.
A low noise current source 240 according to an embodiment of the present application is described below with reference to fig. 2.
The low-noise current source 240 can be applied to the technical field of quantum spin magnetometers, and for example, when the quantum spin magnetometer is used for achieving a spin-free exchange relaxation region and a cancellation coil is used for compensating an environmental magnetic field, low-noise current is provided for the cancellation coil.
As shown in fig. 2, the low-noise current source 240 includes: a backplane and a circuit of low noise current sources as described in any of the above embodiments.
In this embodiment, the backplane is used to support the circuitry for the low noise current source.
The circuit of the low-noise current source is used for providing low-noise current.
The circuit of the low-noise current source is disposed on the bottom plate, and the reference source module 150 is thermally isolated from the digital-to-analog conversion module 130, so as to improve the stability of the reference source module 150.
According to the low-noise current source 240 provided in the embodiment of the present application, by providing thermal isolation between the reference source module 150 and the digital-to-analog conversion module 130, the stability of the reference source module 150 can be improved to output a stable reference voltage.
In some embodiments, the bottom plate around the reference source module 150 has slots.
In this embodiment, for example, in an actual implementation process, the reference source is disposed on the bottom plate, the copper sheets of the power layer and the ground layer below the integrated circuit of the reference source are removed, and the bottom plate around the reference source is hollowed out, so as to further improve the stability of the reference source module 150.
In some embodiments, a shielding cover is further covered outside the reference source module 150 to shield interference information, so as to improve stability of the reference source module 150.
According to the low-noise current source 240 provided in the embodiment of the present application, by providing thermal isolation between the reference source module 150 and the digital-to-analog conversion module 130, providing slots on the bottom plate around the reference source module 150, and providing a shielding cover outside the reference source module 150, the low-noise current source 240 can output an ultra-low noise current.
In some embodiments, the output of the low noise current source 240 is electrically connected to an input of the lock-in amplifier 230, an input of the lock-in amplifier 230 is also electrically connected to an output of the printed circuit board 220, and an output of the programmable power supply 210 is electrically connected to an input of the printed circuit board 220 for supplying power to the printed circuit board 220.
The low-noise current output by the low-noise current source 240 is amplified by the lock-in amplifier 230, and a current with lower noise can be provided for the cancellation coil, so that the magnetic cancellation precision is improved, and the quantum spin magnetometer can reach a spin-exchange-free relaxation region.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A circuit for a low noise current source, comprising:
a main control module;
a reference source module for outputting a reference voltage;
the input end of the digital-to-analog conversion module is respectively and electrically connected with the output end of the main control module and the output end of the reference source module, and the digital-to-analog conversion module is used for filtering the converted voltage and outputting a first voltage;
the input end of the constant current source module is electrically connected with the output end of the digital-to-analog conversion module, the constant current source module is used for converting the first voltage into low-noise current, and the constant current source module is used for providing a feedback signal for the digital-to-analog conversion module.
2. The circuit of a low noise current source of claim 1, wherein the digital-to-analog conversion module comprises:
the input end of the digital-to-analog converter is respectively and electrically connected with the output end of the main control module and the output end of the reference source module;
the input end of the first filter is electrically connected with the output end of the digital-to-analog converter, and the output end of the filter is electrically connected with the constant current source module.
3. The circuit of a low noise current source of claim 1, wherein the reference source module comprises:
a reference source unit;
and the second filter is electrically connected between the reference source unit and the digital-to-analog conversion module.
4. The circuit of the low noise current source according to any one of claims 1 to 3, wherein the constant current source module comprises a sampling resistor, and the sampling resistor is connected in parallel with a target capacitor.
5. The circuit of claim 4, wherein the constant current source module comprises a feedback circuit, an input terminal of the feedback circuit is connected to the sampling resistor, an output terminal of the feedback circuit is electrically connected to the main control module, and the feedback circuit is configured to determine the feedback signal based on the target current output by the constant current source module.
6. The circuit of a low noise current source of any of claims 1-3, further comprising a communication module electrically connected between the master control module and the reference source module.
7. The circuit of claim 6, wherein the communication module comprises at least one communication channel, and wherein the communication channels are isolated from each other.
8. A low noise current source, comprising:
a base plate;
the circuit of the low noise current source according to any of claims 1-7, wherein the circuit of the low noise current source is disposed on the bottom plate, and the reference source module is disposed in thermal isolation from the digital-to-analog conversion module.
9. The low noise current source of claim 8, wherein said bottom plate around said reference source module has slots.
10. A low noise current source according to claim 8 or 9, wherein the reference source module is externally covered with a shielding cover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223092190.3U CN218512855U (en) | 2022-11-17 | 2022-11-17 | Circuit of low-noise current source and low-noise current source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223092190.3U CN218512855U (en) | 2022-11-17 | 2022-11-17 | Circuit of low-noise current source and low-noise current source |
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Address after: 230088 floor 1-4, zone a, building E2, phase II, innovation industrial park, No. 2800, innovation Avenue, high tech Zone, Hefei, Anhui Province Patentee after: Guoyi Quantum Technology (Hefei) Co.,Ltd. Address before: 230088 floor 1-4, zone a, building E2, phase II, innovation industrial park, No. 2800, innovation Avenue, high tech Zone, Hefei, Anhui Province Patentee before: Guoyi Quantum (Hefei) Technology Co.,Ltd. |