Voltage signal acquisition module and method for quantum precision measurement device

Abstract

The invention discloses a voltage signal acquisition module for a quantum precision measurement device. The voltage signal acquisition module comprises seven parts, namely a weak voltage signal, a correlated double-sampling differential input circuit, a front-end analog signal amplifying and conditioning circuit, a high-precision ADC analog-to-digital conversion circuit, a digital control and signal processing unit, an embedded display control screen and a linear isolation voltage-stabilized power supply. The invention also discloses a sampling method. Target voltage signals and circuit voltage noise are effectively separated through the correlated double-sampling differential input circuit, weak voltage signal extraction is achieved, and the key technical problem of weak voltage signal collection in a quantum precision measurement device is effectively solved through the integrated design of hardware optimization and software processing.

Description

Technical Field

[0001] This invention belongs to the field of precision measurement and sensor technology, specifically relating to a high-precision weak voltage signal acquisition module for quantum precision measurement devices, and its acquisition method. Background Technology

[0002] High-precision weak signal acquisition technology is one of the key common technologies used in the field of cold atom precision measurement. It is mainly used for the "high-speed, high-precision, and high-stability" acquisition of physical signals such as weak atomic fluorescence, environmental vibration, and magnetic fields in atomic sensors. With the continuous development of cold atom sensing technology, the accurate acquisition of weak signals from cold atom sensors has become one of the important factors limiting the improvement of their measurement accuracy, which directly determines the accuracy of the equipment's measurement data processing.

[0003] Typically, weak atomic fluorescence, environmental vibration, and magnetic field signals within a cold atom sensor are converted into voltage signals. This requires a signal sampling resolution on the order of 10 μV or even 1 μV, a sampling bandwidth exceeding 10 kHz, and a measurement range exceeding ±1V to meet the accuracy requirements for detecting weak signals. Therefore, research into electrical signal detection technologies for various precision sensors is essential to achieve breakthroughs in high-precision weak voltage signal acquisition modules.

[0004] Conventional voltage signal acquisition methods primarily involve using an analog-to-digital converter (ADC) to convert analog voltage signals into digital voltage signals. ADCs are mainly categorized into successive approximation, serial line, parallel comparator, dual-slope, and Σ-Δ (Sigma-Delta) types, each with its own advantages and disadvantages in terms of power consumption, conversion rate, resolution, conversion accuracy, and signal-to-noise ratio.

[0005] Among them, the Σ-Δ analog-to-digital converter (ADC) utilizes oversampling and digital decimation filtering techniques, featuring high resolution, high signal-to-noise ratio (SNR), and strong anti-interference capabilities, while also maintaining a relatively high sampling bandwidth, making it suitable for applications requiring high bandwidth and high precision for weak signal acquisition. However, for weak voltage signals on the order of 10μV or even 1μV, they are often submerged in device / system-level circuit noise, making it difficult to stably extract useful target signals from the low SNR raw signals. The temperature drift of electronic components is also typically on the order of μV / ℃. During long-term acquisition of weak voltage signals, the stability of the detected weak voltage signals is poor due to the temperature drift characteristics of electronic components, leading to a decrease in detection accuracy.

[0006] To address the low signal-to-noise ratio (SNR) issue in weak signal acquisition, weak signal extraction methods are commonly employed. These methods analyze the frequency and power spectra of the target signal and noise to identify differences between them, and then employ appropriate weak signal detection techniques to separate and extract the useful target signal from the noise, thereby improving the SNR. Classic weak signal detection methods include signal filtering, lock-in amplification, correlation detection, sampling integration, time-domain / digital averaging, spectrum analysis, and power spectrum analysis. However, these methods are mostly designed for extracting signals at specific frequencies, making it difficult to simultaneously meet the requirements of high resolution, wide frequency band, and high dynamic range signal processing.

[0007] The above analysis of the current state of technology shows that existing high-precision signal acquisition technologies have not been systematically optimized for the characteristics of quantum precision measurement signals. Furthermore, they lack integrated design for temperature drift suppression, device / system-level noise suppression, ADC conversion performance, and signal processing. As a result, the acquisition accuracy, sampling bandwidth, and stability in practical applications cannot meet the acquisition requirements of weak voltage signals on the order of 10μV or even 1μV, which has become a major bottleneck restricting the performance breakthrough of quantum precision measurement devices. Summary of the Invention

[0008] To address the problems of low signal-to-noise ratio, insufficient acquisition accuracy, large temperature drift, and low sampling bandwidth and dynamic range in existing weak voltage signal acquisition technologies, which cannot meet the high-performance detection requirements of photoelectric, vibration, and magnetic fields in quantum precision measurement applications, one of the objectives of this invention is to provide a high-precision weak voltage signal acquisition module for quantum precision measurement devices.

[0009] The technical solution adopted by this invention to solve its technical problem is: a voltage signal acquisition module for a quantum precision measurement device, comprising a correlated dual-sampling differential input circuit, a front-end analog signal amplification and conditioning circuit, a high-precision ADC analog-to-digital conversion circuit, a digital control and signal processing unit, and a human-machine interface connected in sequence; and a low-noise isolated regulated power supply connected to the front-end analog signal amplification and conditioning circuit, the high-precision ADC analog-to-digital conversion circuit, and the digital control and signal processing unit respectively; the front-end analog signal amplification and conditioning circuit includes a pre-filtering and differential amplification circuit connected to the correlated dual-sampling differential input circuit, a signal amplification and conditioning circuit connected to the pre-filtering and differential amplification circuit, and a common-mode differential converter and anti-aliasing filter circuit connected to the signal amplification and conditioning circuit. The system includes an automatic gain control circuit connected to a pre-filter and differential amplifier circuit; a high-precision ADC analog-to-digital conversion circuit including a Σ-Δ conversion circuit connected to a common-mode differential converter and an anti-aliasing filter circuit, and a precision reference circuit and a temperature correction and compensation circuit connected to the Σ-Δ conversion circuit; a digital control and signal processing unit including a processing core and a digital isolation circuit and a communication interface connected to the processing core, with the digital isolation circuit and communication interface respectively connected to the Σ-Δ conversion circuit and the human-machine interface; and a low-noise isolation regulated power supply including a linear isolation regulated power supply, an EMI filter circuit, and a multi-path linear power supply connected in sequence, with the linear isolation regulated power supply connected to the processing core and the multi-path power supply respectively connected to the temperature correction and compensation circuit and the front-end analog signal amplification and conditioning circuit.

[0010] Furthermore, the aforementioned correlated dual-sampling differential input circuit consists of a positive terminal differential input circuit and a negative terminal differential input circuit, which respectively input the positive and negative differential signals V. pi With V ni Impedance transformation and switching sampling are performed, and positive and negative differential signals V are output. po With V no The positive terminal differential input circuit consists of a positive terminal signal sampling circuit and a positive terminal noise sampling circuit, while the negative terminal differential input circuit consists of a negative terminal signal sampling circuit and a negative terminal noise sampling circuit.

[0011] The second objective of this invention is to provide a voltage signal acquisition method for a quantum precision measurement device. Employing the aforementioned acquisition module, the method includes the following steps: A correlated dual-sampling differential input circuit rapidly switches between weak voltage signals such as fluorescent electromagnetic signals and vibration signals and short-circuit noise signals to acquire the signal, facilitating the separation of circuit noise signals and extraction of the target voltage signal. Then, a front-end analog signal amplification and conditioning circuit performs multi-stage filtering and gain adaptive amplification conditioning on the sampled voltage signal through a pre-filtering and differential amplification circuit, a signal amplification and conditioning circuit, and a common-mode differential converter and anti-aliasing filter circuit, converting the sampled voltage signal into an input voltage range matching the high-precision ADC analog-to-digital converter circuit. The high-precision ADC circuit then converts the analog voltage signal into a digital voltage signal, and a digital control and signal processing unit performs weak signal extraction and digital filtering on the digital voltage signal to obtain the useful target signal. Finally, the acquired data is uploaded to a human-machine interface for display.

[0012] Furthermore, the relevant dual-sampling differential input circuit performs two fast switching samplings on the input voltage signal and the circuit voltage noise: the first sampling signal contains the target signal and the noise signal, and the second sampling signal contains the total noise of the device level and the system level circuit. The two sampling signals are then subjected to hardware optimization processing such as low-noise differential amplification and conditioning, temperature drift compensation and suppression, high-precision ADC conversion, and digital isolation driving.

[0013] Furthermore, the extracted two sampled digital signals are subtracted and digitally filtered to achieve high-precision acquisition of μV-level weak voltage signals and 1V-level large-range voltage signals.

[0014] Compared with the prior art, the present invention has the following significant advantages:

[0015] 1. Significantly suppresses device / system-level overall noise. By combining relevant dual sampling techniques, hardware optimization, and integrated digital processing design, circuit noise can be effectively separated and suppressed, thereby extracting the target signal submerged in noise and improving the signal-to-noise ratio.

[0016] 2. Sampling accuracy is effectively improved. By suppressing device / system-level circuit noise and employing comprehensive hardware and software optimization design measures such as differential amplification conditioning, temperature drift compensation suppression, digital isolation drive and Σ-Δ type high-precision ADC conversion, and digital algorithm processing, high-precision acquisition of μV-level weak voltage signals is achieved.

[0017] 3. Temperature drift impact is significantly reduced. By combining low-temperature drift circuit design with temperature compensation, the error introduced by temperature drift is controlled within the customer's acceptable range, solving the stability problem during long-term sampling.

[0018] 4. It balances high dynamic range and sampling bandwidth. While ensuring high resolution, the amplifier gain coefficient, filtering parameters, and sampling rate can be flexibly configured, making it suitable for acquiring various precision sensor signals such as sound waves, photoelectric signals, magnetic fields, and vibrations.

[0019] 5. Strong resistance to environmental interference. Through electromagnetic compatibility measures such as electrical isolation, shielding design, and ground loop optimization, it effectively suppresses electromagnetic interference noise from the external environment. Attached Figure Description

[0020] Figure 1 This is a circuit block diagram of the data acquisition module of the present invention;

[0021] Figure 2 This is a reference example of a block diagram for the data acquisition module of the present invention.

[0022] The labels in the attached figures are as follows: 1—weak voltage signal, 2—correlated dual-sampling differential input circuit, 3—front-end analog signal amplification and conditioning circuit, 31—pre-filter and differential amplification circuit, 32—signal amplification and conditioning circuit, 33—common-mode differential converter and anti-aliasing filter circuit, 34—automatic gain control circuit, 4—high-precision ADC analog-to-digital conversion circuit, 41—Σ-Δ type conversion circuit, 42—precision reference circuit, 43—temperature correction and compensation circuit, 5—digital control and signal processing unit, 51—processing core, 52—digital isolation circuit, 53—communication interface, 6—human-machine interface, 61—embedded display and control screen, 7—low-noise isolation regulated power supply, 71—linear isolation regulated power supply, 72—EMI filter circuit, 73—multi-line linear power supply. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] This invention addresses the need for precise detection of photoelectric, vibration, and magnetic field voltage signals in quantum precision measurement applications within quantum precision measurement devices. It proposes a novel, highly stable, high-precision, and large-range weak voltage signal acquisition module and method.

[0025] Reference Figure 1 As shown, the present invention discloses a high-precision weak voltage signal acquisition module for quantum precision measurement devices, comprising seven parts: 1. weak voltage signals such as fluorescence, electromagnetic and vibration signals; 2. correlated dual sampling differential input circuit; 3. front-end analog signal amplification and conditioning circuit; 4. high-precision ADC analog-to-digital conversion circuit; 5. digital control and signal processing unit; 6. human-machine interface (such as embedded display screen 61); and 7. linear isolation regulated power supply.

[0026] Reference Figure 2As shown, the correlated dual-sampling differential input circuit 2 consists of two differential input circuits, one for the positive terminal and one for the negative terminal. These circuits respectively input the positive and negative differential signals V. pi With V ni Impedance transformation and switching sampling are performed, and positive and negative differential signals V are output. po With V no The positive differential input circuit consists of a positive signal sampling circuit and a positive noise sampling circuit, while the negative differential input circuit consists of a negative signal sampling circuit and a negative noise sampling circuit. The positive and negative differential input circuits are switched for sampling via their respective single-pole double-throw switches, where switch S1 controls the positive differential signal V. pi Switching to short-circuit noise, switch S2 switches to the negative terminal differential signal V. ni It switches between short-circuit noise and signal source noise. This effectively separates the target signal from circuit noise, enabling high-precision acquisition of weak voltage signals.

[0027] The front-end analog signal amplification and conditioning circuit 3 mainly consists of a three-stage amplification and filtering circuit composed of differential amplifiers and operational amplifiers. It includes a pre-filter and differential amplification circuit 31 connected to the correlated dual-sampling differential input circuit 2, a signal amplification and conditioning circuit 32 connected to the pre-filter and differential amplification circuit 31, and a common-mode differential converter and anti-aliasing filter circuit 33 connected to the signal amplification and conditioning circuit 32. It also includes an automatic gain control circuit 34 connected to the pre-filter and differential amplification circuit 31. These circuits perform differential amplification, signal conditioning, and filtering on the sampled voltage signals at each stage to meet the voltage range suitable for the analog-to-digital converter signal conversion. The pre-filter and differential amplifier circuit 31, serving as the first-stage pre-differential amplifier circuit, can achieve large-range and high-dynamic-range signal acquisition through automatic gain adjustment. The signal amplification and conditioning circuit 32, serving as the second-stage amplification, conditioning, and characteristic filtering circuit, designs a suitable characteristic filter to filter out noise based on the spectral characteristics of the input signal and noise, and then amplifies the signal again. The third-stage common-mode differential converter and anti-aliasing filter circuit 33 performs differential conversion on the input signal again and filters out signal components higher than 1 / 2 sampling frequency to meet the input voltage and sampling rate requirements of the high-precision ADC chip.

[0028] The high-precision ADC analog-to-digital converter circuit 4 converts the analog sampled voltage signal into a corresponding digital voltage signal. In this embodiment, a Σ-Δ type high-precision ADC chip, i.e., a Σ-Δ type conversion circuit 41, is used to achieve the analog-to-digital conversion. It utilizes the principles of oversampling and digital filtering technology to decimate, filter, and process the digital voltage signal, which can greatly improve accuracy and reduce signal noise. To suppress temperature drift, a precision reference circuit 42 is used as a precision voltage reference source to provide a stable reference voltage for the ADC chip. At the same time, a temperature correction and compensation circuit 43 is designed to compensate for the temperature of the acquired signal. The digital control unit realizes the functions of driving the ADC chip, digital filtering, and data transmission communication. To reduce acquisition noise, the digital circuit and analog circuit are electrically isolated, and the high-precision ADC converter is driven by an integrated digital isolator.

[0029] The digital control and signal processing unit 5 includes a processing core 51 and a digital isolation circuit 52 and a communication interface 53 connected to the processing core 51. The digital isolation circuit 52 and the communication interface 53 are respectively connected to the Σ-Δ type conversion circuit 41 and the human-machine interface 6.

[0030] The low-noise isolated regulated power supply 71 transforms the external input power supply and outputs a multi-channel isolated switching power supply to a multi-channel linear power supply 73. The power supply ripple noise is then filtered out by the DC EMI filter circuit 72, and the power supply noise is further suppressed by the multi-channel linear regulated power supply, finally obtaining the low-noise regulated power supply required by analog and digital circuits.

[0031] This invention's weak voltage signal acquisition module not only significantly reduces voltage noise in the target signal and improves the signal-to-noise ratio, but also fully utilizes the ADC conversion performance through automatic gain adjustment and temperature correction, enhancing sampling stability, sampling bandwidth, and dynamic measurement range. This meets the performance requirements of quantum precision measurement devices for weak signal acquisition. As a precision voltage detection technology, it can be widely applied in sensor technology, instrumentation technology, and metrology, enabling high-precision weak voltage signal acquisition from precision sensors such as acoustic waves, photoelectric sensors, magnetic fields, and vibration sensors. It represents a novel, highly stable, high-precision, and large-range weak voltage signal acquisition technology.

[0032] To further reduce noise, the hardware circuit of this invention adopts electromagnetic compatibility design. All analog and digital circuits are laid out in separate areas, and the analog signal path adopts the shortest wiring principle to reduce signal interference; critical signal lines adopt differential layout and are wrapped with shielding layers; the PCB board adopts a multi-layer board design, with separate bottom and power layers to reduce loop interference; the entire device adopts a metal shielded shell, and the shell is grounded to effectively suppress external electromagnetic radiation interference and prevent internal signal leakage.

[0033] The present invention discloses a method for acquiring high-precision weak voltage signals for quantum precision measurement devices, comprising the following steps.

[0034] The related dual-sampling differential input circuit 2 rapidly switches between weak voltage signals 1, such as fluorescent electromagnetic signals and vibration signals, and short-circuit noise signals, to achieve two continuous, real-time signal acquisitions in a short time, so as to separate circuit noise signals and extract target voltage signals.

[0035] The related dual-sampling differential input circuit 2 performs two fast switching samplings on the input voltage signal and the circuit voltage noise. The first sampling signal contains the target signal and the noise signal, and the second sampling signal contains the total noise of the device level and the system level circuit. The two sampling signals are subjected to hardware optimization processing such as low-noise differential amplification and conditioning, temperature drift compensation and suppression, high-precision ADC conversion and digital isolation driving. Then, the extracted two sampling digital signals are subtracted and digitally filtered. This effectively separates the target voltage signal and the circuit noise, so as to achieve high-precision acquisition of not only μV-level weak voltage signals, but also 1V-level large-range voltage signals.

[0036] By subtracting the two sampled digital signals and performing digital filtering, the target voltage signal and circuit noise are effectively separated, achieving high-precision acquisition of weak voltage signals.

[0037] Furthermore, through the integrated design of hardware optimization and software processing, namely hardware optimization processing such as gain-adjustable low-noise differential amplification conditioning, temperature drift compensation and suppression, high-precision ADC conversion and digital isolation drive, as well as software processing such as digital filtering algorithms, high-precision acquisition of μV-level weak voltage signals and high-precision acquisition of 1V-level large-range voltage signals have been achieved.

[0038] Then, the front-end analog signal amplification and conditioning circuit 3 performs multi-stage filtering, gain adaptive amplification and conditioning, etc., on the sampled voltage signal through the pre-filter and differential amplification circuit 31, the signal amplification and conditioning circuit 32 and the common-mode differential conversion and anti-aliasing filter circuit 33, and converts it into the input voltage range that matches the high-precision ADC analog-to-digital conversion circuit 4.

[0039] The high-precision ADC analog-to-digital converter circuit 4 then converts the analog voltage signal into a digital voltage signal. The digital control and signal processing unit 5 then performs weak signal extraction and digital filtering on the digital voltage signal to obtain the useful target signal. To reduce voltage noise in the target signal, the analog circuit and digital circuit are first isolated by the digital isolation circuit 52. An isolated drive method is used to control the high-precision ADC converter for analog-to-digital conversion. At the same time, the analog circuit and digital circuit are powered by low-noise isolated regulated power supplies 7.

[0040] The human-computer interaction interface 6 is used for digital control. It can easily set parameters such as gain coefficient, sampling rate and digital filtering method, and upload and display the collected data.

[0041] Optionally, the linear isolation regulated power supply 71 can be designed as a multi-channel isolated switching power supply using an AC / DC or DC / DC converter, and the EMI filter can be designed as a single-stage or cascaded common-mode + differential-mode DC filter.

[0042] Optionally, the correlated dual-sampling differential input circuit 2 can be designed as an active correlated dual-sampling differential input circuit with an operational amplifier, or as a passive correlated dual-sampling differential input circuit that removes the operational amplifier and retains only the matching impedance; or even as a correlated dual-sampling single-ended input circuit for single-ended voltage signals.

[0043] Optionally, the signal amplification and conditioning circuit 32 based on multi-stage differential amplification and filtering can be designed as a single-stage gain-controlled pre-filter and amplification circuit plus two or more stages of differential amplification and filtering circuit. This can amplify the input signal to a voltage range suitable for ADC conversion and effectively suppress circuit noise. The differential amplifier circuit can be implemented using multiple operational amplifiers or instrumentation amplifiers.

[0044] Optionally, the high-precision ADC analog-to-digital conversion circuit 4 can be a Σ-Δ type high-precision ADC converter or a dual-slope high-precision ADC converter, with a conversion bit depth of 24 bits or up to 32 bits. Optionally, the digital control and signal processing unit 5 can be a digital controller such as a DSP, FPGA, or SOC, or an MCU controller, such as the MPS430 series or STM32 series single-chip controller.

[0045] Optionally, the human-machine interface 6 can be designed as an embedded display screen or PC-based host computer software. The embedded display screen is used for human-machine control, enabling digital settings such as gain coefficient, sampling rate, and digital filtering method, and uploading the collected data and status information.

[0046] Those skilled in the art will readily understand that the above description is merely a preferred use case of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A voltage signal acquisition module for a quantum precision measurement device, characterized by: The application relates to a high-precision ADC (analog-to-digital converter) signal acquisition and processing system, which comprises sequentially connected correlation double sampling differential input circuit (2), front-end analog signal amplification and conditioning circuit (3), high-precision ADC analog-to-digital conversion circuit (4), digital control and signal processing unit (5) and man-machine interaction interface (6), and further comprises low-noise isolation voltage stabilizing power supply (7) connected with the front-end analog signal amplification and conditioning circuit (3), the high-precision ADC analog-to-digital conversion circuit (4) and the digital control and signal processing unit (5) respectively; the front-end analog signal amplification and conditioning circuit (3) comprises pre-filtering and differential amplification circuit (31) connected with the correlation double sampling differential input circuit (2), signal amplification and conditioning circuit (32) connected with the pre-filtering and differential amplification circuit (31) and common-mode differential conversion and anti-aliasing filter circuit (33) connected with the signal amplification and conditioning circuit (32), and further comprises automatic gain control circuit (34) connected with the pre-filtering and differential amplification circuit (31); the high-precision ADC analog-to-digital conversion circuit (4) comprises sigma-delta type conversion circuit (41) connected with the common-mode differential conversion and anti-aliasing filter circuit (33) and precision reference circuit (42) and temperature correction and compensation circuit (43) connected with the sigma-delta type conversion circuit (41); the digital control and signal processing unit (5) comprises processing core (51) and digital isolation circuit (52) and communication interface (53) connected with the processing core (51), wherein the digital isolation circuit (52) and the communication interface (53) are connected with the sigma-delta type conversion circuit (41) and the man-machine interaction interface (6) respectively; the low-noise isolation voltage stabilizing power supply (7) comprises sequentially connected linear isolation voltage stabilizing power supply (71), EMI filter circuit (72) and multi-channel linear power supply (73), wherein the linear isolation voltage stabilizing power supply (71) is connected with the processing core (51), and the multi-channel linear power supply (73) is connected with the temperature correction and compensation circuit (43) and the front-end analog signal amplification and conditioning circuit (3) respectively.

2. The voltage signal acquisition module for quantum precision measurement device according to claim 1, characterized in that, The correlation double sampling differential input circuit (2) is composed of positive-end differential input circuit and negative-end differential input circuit, and impedance conversion and switch sampling are conducted on positive and negative differential signals respectively, and positive and negative differential signals are output; the positive-end differential input circuit is composed of positive-end signal sampling circuit and positive-end noise sampling circuit, and the negative-end differential input circuit is composed of negative-end signal sampling circuit and negative-end noise sampling circuit.

3. A voltage signal acquisition method for a quantum precision measurement device, using the acquisition module of claim 1, characterized in that, The application further discloses a high-precision ADC signal acquisition and processing method, which comprises the following steps: The correlation double sampling differential input circuit (2) realizes signal acquisition, separates noise signals and extracts target voltage signals by rapidly switching weak voltage signals (1) and short-circuit noise signals; The front-end analog signal amplification and conditioning circuit (3) converts the voltage signals into input voltage ranges matched with the high-precision ADC analog-to-digital conversion circuit (4) through multi-stage filtering, gain self-adaptive amplification conditioning of the pre-filtering and differential amplification circuit (31), the signal amplification and conditioning circuit (32) and the common-mode differential conversion and anti-aliasing filter circuit (33); The analog voltage signal is converted into a digital voltage signal by a high-precision ADC analog-digital conversion circuit (4), and the digital voltage signal is subjected to weak signal extraction and digital filtering processing by a digital control and signal processing unit (5) to obtain a useful target signal; Finally, the collected data is uploaded to a man-machine interaction interface (6) for display.

4. The voltage signal acquisition module for quantum precision measurement device according to claim 3, characterized in that, The related double sampling differential input circuit (2) performs two fast switching samplings on the input voltage signal and the circuit voltage noise: the first sampling is performed on the target signal and the noise signal, and the second sampling is performed on the device-level and system-level circuit total noise, and the two sampling signals are subjected to low-noise differential amplification conditioning, temperature drift compensation suppression, high-precision ADC conversion and digital isolation driving.

5. The voltage signal acquisition module for quantum precision measurement device according to claim 4, characterized in that, The related double sampling differential input circuit (2) subtracts and digitally filters the two sampling digital signals extracted to separate the target voltage signal and the circuit voltage noise, realizes high-precision collection of the μV-level weak voltage signal, and realizes high-precision collection of the 1V-level large-range voltage signal.

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