High-precision analog-to-digital conversion module for precise measurement

Abstract

The utility model relates to the technical field of analog-to-digital conversion, in particular to a precision measurement high-precision analog-to-digital conversion module, which comprises a precision measurement high-precision analog-to-digital conversion module, a high-precision analog-to-digital converter, a noise suppression module, a clock management module, a power management module, a digital signal processing module and a communication interface. By providing the high-precision analog-to-digital conversion module for precision measurement, noise interference can be effectively suppressed while high resolution is ensured, high-precision, high-stability and high-integration analog-to-digital conversion is realized, and the high-precision analog-to-digital conversion module is suitable for various precision measurement application scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of analog-to-digital conversion, in particular to a precision measurement and high-precision analog-to-digital conversion module. Background Art

[0002] Analog-to-digital converters (ADCs) are essential components for converting analog signals into digital signals and are widely used in various electronic devices and systems. In the field of precision measurement, high-precision ADCs are key to ensuring the accuracy and reliability of measurement data.

[0003] However, existing high-precision analog-to-digital converters still have certain limitations in terms of noise suppression, resolution, conversion speed, etc. For example, although some high-precision analog-to-digital converters have high resolution, they perform poorly in noise suppression, resulting in large errors in the measured data; while other analog-to-digital converters have fast conversion speeds but cannot meet the requirements of precision measurement in terms of resolution;

[0004] Therefore, in view of the above-mentioned problems, this technical solution proposes a precision measurement and high-precision analog-to-digital conversion module. Utility Model Content

[0005] The purpose of the present invention is to provide a high-precision analog-to-digital conversion module for precise measurement, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present utility model provides the following technical solutions: a precision measurement and high-precision analog-to-digital conversion module, comprising an input interface circuit for receiving an external analog signal and preprocessing the signal;

[0007] High-precision analog-to-digital converter, used to convert the pre-processed analog signal into a digital signal, with high resolution and high conversion accuracy;

[0008] The noise suppression module includes a low-noise amplifier and a power supply noise filter circuit, which is used to suppress noise interference in the input signal and improve the signal-to-noise ratio (SNR);

[0009] Clock management module, providing stable clock signal to ensure high-precision conversion of analog-to-digital converter;

[0010] The power management module includes a voltage-stabilized power supply and a power filter circuit to provide a stable power supply and reduce the impact of power supply noise on the analog-to-digital converter;

[0011] Digital signal processing module, used to process and correct the converted digital signal to improve the accuracy and reliability of the data;

[0012] Communication interfaces, including standard communication interfaces such as SPI and I2C, are used to transmit digital signals to external processors or storage devices.

[0013] Compared with the existing technology, the beneficial effects of the present invention are: through a high-precision analog-to-digital converter and an optimized digital signal processing algorithm, high-resolution and high-precision signal conversion is achieved to meet the needs of precision measurement;

[0014] Through the low-noise amplifier and power supply noise filter circuit, external and internal noise interference is effectively suppressed, the signal-to-noise ratio is improved, and the accuracy of the conversion data is ensured;

[0015] Stable clock management: A highly stable clock management module is used to ensure the precise timing of the analog-to-digital converter, improving conversion accuracy and stability.

[0016] By highly integrating various functional modules, the need for external auxiliary circuits is reduced, system complexity and cost are reduced, and the practicality and application scope of the modules are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the architecture diagram of the high-precision analog-to-digital conversion module for precision measurement. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0022] See also Figure 1 , a precision measurement and high-precision analog-to-digital conversion module, including an input interface circuit for receiving external analog signals and pre-processing the signals;

[0023] High-precision analog-to-digital converter, used to convert the pre-processed analog signal into a digital signal, with high resolution and high conversion accuracy;

[0024] The noise suppression module includes a low-noise amplifier and a power supply noise filter circuit, which is used to suppress noise interference in the input signal and improve the signal-to-noise ratio (SNR);

[0025] Clock management module, providing stable clock signal to ensure high-precision conversion of analog-to-digital converter;

[0026] The power management module includes a voltage-stabilized power supply and a power filter circuit to provide a stable power supply and reduce the impact of power supply noise on the analog-to-digital converter;

[0027] Digital signal processing module, used to process and correct the converted digital signal to improve the accuracy and reliability of the data;

[0028] Communication interfaces, including standard communication interfaces such as SPI and I2C, are used to transmit digital signals to external processors or storage devices.

[0029] In an embodiment of the present invention, the input interface circuit includes an input buffer amplifier, a prefilter, and a differential input configuration; the input buffer amplifier uses a low-noise, high-precision operational amplifier to buffer and amplify the input signal to ensure signal stability and accuracy; the prefilter uses a combination of high-pass and low-pass filters to filter out high-frequency noise and low-frequency interference in the input signal to ensure signal purity; the differential input configuration: supports single-ended and differential input configurations, adapts to different application scenarios, and improves the signal's anti-interference ability.

[0030] Among them, the input buffer amplifier can be used, such as OPA1612, which has low offset voltage, low noise density and high gain-bandwidth product, and can effectively amplify weak analog signals while suppressing noise interference;

[0031] The corresponding circuit structure adopts a non-inverting amplifier configuration, and the gain is determined by the feedback resistor to ensure the linear amplification of the signal;

[0032] The corresponding power management operational amplifier is powered by a bipolar power supply to provide a stable working environment and reduce the impact of power supply noise on the signal.

[0033] Specifically, the pre-filter uses a combination of high-pass and low-pass filters to form a band-pass filter, and the specific design is as follows:

[0034] High-pass filter: Use RC high-pass filter with a cutoff frequency of 10 Hz to filter out DC offset and low-frequency noise.

[0035] Low-pass filter: Use RC low-pass filter with a cutoff frequency of 1kHz to filter out high-frequency noise and interference and retain the useful signal frequency band.

[0036] Filter order: The pre-filter is designed as a second-order filter to improve the filtering effect and further suppress noise interference.

[0037] The high-precision analog-to-digital converter is the core component of the module and has the following features:

[0038] High resolution: 24-bit analog-to-digital converter is used to provide high-resolution signal conversion to meet the needs of precision measurement.

[0039] High sampling rate: supports sampling rates up to 1MHz, capable of capturing rapidly changing signals.

[0040] Low distortion: Adopts a high linearity conversion architecture to reduce nonlinear distortion and improve conversion accuracy.

[0041] Low power design: Optimized circuit design to reduce power consumption, suitable for portable and embedded applications.

[0042] Specifically, the high-precision analog-to-digital converter has a built-in calibration mechanism, including:

[0043] Self-calibration function: Through the built-in reference voltage source and offset calibration circuit, the offset and gain errors of the analog-to-digital converter are automatically calibrated to improve conversion accuracy.

[0044] Temperature compensation: A temperature sensor is used to monitor the module's operating temperature in real time, and a temperature compensation algorithm is used to reduce the impact of temperature changes on the performance of the analog-to-digital converter.

[0045] As a preferred embodiment of the present invention, the low-noise amplifier adopts a low-noise design to further amplify the signal while suppressing noise, thereby improving the signal-to-noise ratio;

[0046] Specifically, the low-noise amplifier uses OPA1612, and the corresponding circuit configuration and gain settings are as follows:

[0047] Circuit Configuration: A differential amplifier configuration is used to improve the common-mode rejection ratio (CMRR) and suppress common-mode noise in the input signal.

[0048] Gain setting: The gain is set by the feedback resistor to ensure that the amplitude of the amplified signal is adapted to the input range of the analog-to-digital converter.

[0049] The power supply noise filter circuit adopts multi-stage filtering technology to filter out high-frequency noise and ripple in the power supply, ensuring the power supply stability of the analog-to-digital converter and reducing noise interference;

[0050] The corresponding input filtering uses common-mode chokes and multi-stage capacitor filtering to filter out high-frequency noise and ripple, provide pure DC power supply, and a built-in LDO regulator to further reduce power supply noise and ensure stable operation of the analog-to-digital converter and amplifier.

[0051] As a preferred embodiment of the present invention, the clock management module includes a high-stability crystal oscillator and a clock buffer; the high-stability crystal oscillator adopts a high-stability quartz crystal oscillator to provide a precise clock frequency.

[0052] The clock buffer uses a dedicated clock buffer chip, such as BUF634, which has high driving capability and low latency characteristics to ensure stable transmission of the clock signal within the module;

[0053] The clock signal is buffered and distributed through the clock buffer to ensure the stability and interference-free of the clock signal.

[0054] As a preferred embodiment of the present invention, the regulated power supply adopts a multi-channel regulated power supply to provide different voltage levels, such as 3.3V, 5V, etc., to meet the power supply requirements of each module;

[0055] The power filter circuit uses a low-pass filter and a common-mode choke to filter out high-frequency noise and interference in the power supply, ensuring the power supply stability of each module;

[0056] At the same time, the power management module is also equipped with a built-in overvoltage protection circuit to prevent power overvoltage from damaging the module.

[0057] As a preferred embodiment of the present invention, the digital signal processing module includes a digital filter, a correction algorithm, and a data cache; the digital filter uses a digital filtering algorithm, such as Kalman filtering, low-pass filtering, etc., to remove noise and interference in the digital signal and improve the signal quality;

[0058] Correction algorithm: Through the software correction algorithm, the offset and gain errors of the analog-to-digital converter are corrected to improve the accuracy and consistency of the conversion;

[0059] Specifically, the correction algorithm includes offset correction: by measuring the zero offset of the analog-to-digital converter, the reference of the digital signal is adjusted in real time to eliminate the offset error.

[0060] Gain correction: By calibrating the input signal of known amplitude, the gain coefficient of the digital signal is adjusted to ensure the linear relationship and accuracy of the output data;

[0061] Data caching: Use high-speed cache to store converted data to support high-throughput data processing requirements;

[0062] Specifically: Cache design: Adopt FIFO (first-in-first-out) cache structure to ensure orderly storage and transmission of data and avoid data loss and overflow.

[0063] Interface optimization: Through high-bandwidth data interfaces, high-speed data transmission is achieved to ensure the real-time and integrity of data.

[0064] As a preferred embodiment of the present invention, the specific functions of the communication interface are as follows:

[0065] Multi-interface support: Supports multiple standard communication protocols such as SPI and I2C, facilitating integration with different types of external processors or storage devices.

[0066] High-speed transmission: Optimize the design of the communication interface to support high-speed data transmission and meet the data transmission requirements of high-sampling-rate analog-to-digital converters.

[0067] Programmable interface: Through the programmable interface, users can configure communication parameters according to specific application requirements, improving the flexibility and adaptability of the module.

[0068] In order to better understand the application effect of the present invention, the following describes in detail the performance of the precision measurement and high-precision analog-to-digital conversion module in actual applications through specific application cases;

[0069] An industrial automation company primarily engages in the research and development and production of intelligent manufacturing equipment, which involves a large number of precision measurement and control tasks. Traditional analog-to-digital conversion modules exhibit unstable performance in high-noise environments, impacting the equipment's measurement accuracy and reliability.

[0070] Application Process:

[0071] Module integration: Integrate precision measurement and high-precision analog-to-digital conversion modules into intelligent manufacturing equipment to replace the original low-precision analog-to-digital converter modules.

[0072] Signal access: The analog signal collected by the sensor is connected to the module through the input interface circuit for preprocessing and noise suppression.

[0073] Data conversion and processing: The high-precision analog-to-digital converter in the module converts the preprocessed signal into a digital signal, and the digital signal processing module filters and corrects the data.

[0074] Data transmission and control: The processed digital signal is transmitted to the main controller through the SPI interface for real-time monitoring and control of the equipment.

[0075] Performance Verification: After module integration, a comprehensive performance test is conducted on the device to verify the module's measurement accuracy and system stability in a high-noise environment.

[0076] Effect evaluation

[0077] By applying this utility model, the measurement accuracy of the equipment has been improved by more than 50%, noise interference has been significantly reduced, and the system operation has become more stable and reliable. At the same time, the high integration design of the module reduces the complexity and cost of the system, improving the overall performance and competitiveness of the equipment.

[0078] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. Precision measurement high-precision analog-to-digital conversion module, characterized by: It includes an input interface circuit for receiving external analog signals and preprocessing the signals, and a high-precision analog-to-digital converter for converting the preprocessed analog signals into digital signals; The noise suppression module includes a low-noise amplifier and a power supply noise filter circuit, which is used to suppress noise interference in the input signal and improve the signal-to-noise ratio (SNR); Clock management module, providing stable clock signal; Power management module, including voltage stabilizing power supply and power filter circuit; A digital signal processing module, used for processing and correcting the converted digital signal; Communication interfaces, including SPI and I2C communication interfaces, are used to transmit digital signals to external processors or storage devices.

2. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The input interface circuit includes an input buffer amplifier, a prefilter, and a differential input configuration; the input buffer amplifier uses a low-noise, high-precision operational amplifier, the prefilter uses a combination of high-pass and low-pass filters, and the differential input configuration supports single-ended and differential input configurations.

3. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The high-precision analog-to-digital converter uses a 24-bit analog-to-digital converter and supports a sampling rate of up to 1 MHz.

4. The precision measurement and high-precision analog-to-digital conversion module according to claim 3, characterized in that: The high-precision analog-to-digital converter has a built-in calibration mechanism, including a self-calibration function and temperature compensation.

5. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The low-noise amplifier adopts a low-noise design, and the power supply noise filter circuit adopts a multi-stage filtering technology.

6. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The clock management module includes a high-stability crystal oscillator and a clock buffer; the high-stability crystal oscillator adopts a high-stability quartz crystal oscillator to provide accurate clock frequency, and the clock buffer adopts a dedicated clock buffer chip.

7. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The voltage-stabilized power supply adopts a multi-channel voltage-stabilized power supply, and the power supply filter circuit adopts a low-pass filter and a common-mode choke coil.

8. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The power management module is also provided with a built-in overvoltage protection circuit.

9. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The digital signal processing module includes a digital filter, a correction algorithm and a data cache; the digital filter adopts a digital filtering algorithm; the correction algorithm includes offset correction, gain correction and data cache.

10. The precision measurement and high-precision analog-to-digital conversion module according to claim 1, characterized in that: The communication interface supports multiple interfaces, high-speed transmission, and programmable interfaces.

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