CN117220676A - Calibration system based on analog-to-digital converter - Google Patents
Calibration system based on analog-to-digital converter Download PDFInfo
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Abstract
The application discloses a calibration system based on an analog-to-digital converter, which comprises a signal generator to be calibrated, a reference signal generator, a first analog-to-digital converter, a second analog-to-digital converter and a first processing comparison unit, wherein the signal generator to be calibrated generates an analog signal to be calibrated and transmits the analog signal to the first analog-to-digital converter, the first analog-to-digital converter converts the analog signal to be calibrated into a digital signal to be calibrated, the reference signal generator generates a reference analog signal and transmits the reference analog signal to the second analog-to-digital converter, the second analog-to-digital converter converts the reference analog signal into a reference digital signal, the first processing comparison unit acquires the digital signal to be calibrated and the reference digital signal, compares and determines the difference degree, the value of the two signals is better acquired through the analog-to-digital converter according to the difference degree, and meanwhile, the first processing comparison unit is used for carrying out value calibration to acquire the calibration result.
Description
Technical Field
The application relates to the field of data processing of analog-to-digital converters, in particular to a calibration system based on an analog-to-digital converter.
Background
The analog-to-digital converter is a circuit module for converting an analog signal into a digital signal, and the analog signal such as temperature, humidity, pressure and voltage acquired by a sensor and the like needs to be converted into the digital signal before being processed by computer software, so that the analog-to-digital conversion technology is widely applied to various fields as a data processing technology.
An analog signal is information represented by a continuously varying physical quantity whose amplitude, frequency, or phase changes continuously over time, or a signal whose characteristic quantity representing information can be represented as an arbitrary value at an arbitrary instant in a continuous time interval; the digital signal is a signal in which both the independent variable and the dependent variable are discrete.
In modern circuit electronic component production, a lot of unqualified products are always generated by a large amount of components, so that the components need to be tested to ensure that the components meet relevant standards, for example, in the existing chip calibration method, the output voltage of a chip needs to be repeatedly measured, in the existing chip calibration method, the reference voltage of an analog-to-digital converter is usually provided by a chip to be calibrated, the output voltage of the chip needs to be repeatedly measured, and in the prior art, the analog-to-digital converter and the reference voltage need to be calibrated first. Therefore, the efficiency of chip calibration in the prior art needs to be improved, and the calibration cost needs to be reduced.
Disclosure of Invention
Aiming at the problems and the technical requirements, the inventor provides a calibration system based on an analog-to-digital converter, and the technical scheme of the application is as follows:
a calibration system based on an analog-to-digital converter comprises a signal generator to be calibrated, a reference signal generator, a first analog-to-digital converter, a second analog-to-digital converter and a first processing comparison unit,
the signal generator generates an analog signal to be calibrated and transmits the analog signal to be calibrated to the first analog-to-digital converter, the first analog-to-digital converter converts the analog signal to be calibrated into a digital signal to be calibrated,
the reference signal generator generates a reference analog signal and transmits the reference analog signal to the second analog-to-digital converter, which converts the reference analog signal into a reference digital signal,
the first processing comparison unit acquires the digital signal to be calibrated and the reference digital signal, compares the digital signal to be calibrated and the reference digital signal to determine the difference degree, and determines a calibration result according to the difference degree.
The further technical scheme is that the converting the analog signal to be calibrated into the digital signal to be calibrated includes:
and converting the analog signal to be calibrated into a first continuous curve which is arranged according to time, obtaining the most stable analog curve to be calibrated in the first continuous curve, and converting the most stable analog curve to be calibrated into a digital signal to be calibrated.
The method further includes the steps of:
and dividing the first continuous curve into a plurality of to-be-calibrated analog curves on average according to a preset time period, determining the highest value and the lowest value of each to-be-calibrated analog curve, and determining the to-be-calibrated analog curve with the smallest difference between the highest value and the lowest value in the same to-be-calibrated analog curve as the most stable to-be-calibrated analog curve.
The further technical scheme is that the converting the reference analog signal into a reference digital signal comprises:
and converting the reference analog signal into a second continuous curve which is arranged in time, determining a reference analog curve in the second continuous curve, which has the same time period as the most stable analog curve to be calibrated, and converting the reference analog curve into the reference digital signal.
The further technical scheme is that the obtaining the digital signal to be calibrated and the reference digital signal and comparing to determine the difference degree includes:
the first processing comparison unit obtains an average value of the digital signal to be calibrated and an average value of the reference digital signal, and a difference value between the average value of the digital signal to be calibrated and the average value of the reference digital signal is used as the difference degree.
The further technical scheme is that the determining the calibration result according to the difference degree comprises:
when the difference degree is in a preset range, determining that the digital signal to be calibrated is a normal signal; and when the difference degree is not in the preset range, determining that the digital signal to be calibrated is an abnormal signal.
The calibration system further comprises a main controller, wherein the main controller is connected to the first processing comparison unit and the signal generator to be calibrated, and when the difference degree is not in a preset range, the main controller adjusts the configuration of the signal generator to be calibrated.
The further technical scheme is that the adjusting the configuration of the signal generator to be calibrated comprises:
and adjusting the average value of the adjusted digital signals generated by the signal generator to be calibrated to be within a preset average value, wherein the average value of the reference digital signals is within the preset average value.
The beneficial technical effects of the application are as follows: the digital value of the two signals is better obtained through the analog-to-digital converter, and meanwhile, the first processing comparison unit is used for carrying out digital value calibration to obtain a calibration result; different analog signals can be better processed through the two analog-to-digital converters, the conversion sequence is not required to be influenced, meanwhile, as a plurality of components are detected, the single analog-to-digital converters are respectively used, the conversion process of the analog signals to be calibrated is not influenced, and the accuracy of calibration is further improved; in order to improve the detection speed and not to reduce the detection accuracy, a section of the analog signal to be calibrated is selected for calibration, and the characteristics of the whole first continuous curve are marked by the most stable analog curve to be calibrated.
Drawings
FIG. 1 is a schematic diagram of a calibration system of the present application.
Fig. 2 is a schematic diagram of two digital signals of the present application.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present application are shown in the drawings.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
As shown in fig. 1, the calibration system based on the analog-to-digital converter comprises a signal generator to be calibrated, a reference signal generator, a first analog-to-digital converter, a second analog-to-digital converter and a first processing comparison unit, wherein the signal generator to be calibrated is connected to the first processing comparison unit through the first analog-to-digital converter, the reference signal generator is connected to the first processing comparison unit through the second analog-to-digital converter, values of two signals are better obtained through the analog-to-digital converter, and meanwhile, the first processing comparison unit is used for carrying out numerical calibration to obtain a calibration result.
The following describes each element of the system specifically, the signal generator to be calibrated generates an analog signal to be calibrated and transmits the analog signal to the first analog-to-digital converter, the analog signal to be calibrated is a signal value generated by the component to be calibrated, in an analog state, the analog signal can be generated by the tester, and in an actual inspection process, the analog signal to be calibrated is a signal generated by the component to be detected, the analog signal to be calibrated can be a signal to be calibrated generated by the signal generator according to a configuration, the signal can be an analog signal to be calibrated generated by a preset gear, the analog signal to be calibrated can also be a signal to be calibrated generated by the signal generator after the configuration of the signal generator is updated, the reference analog signal generated by the reference signal generator is transmitted to the second analog-to-digital converter, the reference analog signal generated by the reference signal generator can be determined according to an actually required calibration target, and specifically, the reference signal generator can realize a related function by the tester.
As shown in fig. 2, the first analog-to-digital converter converts the analog signal to be calibrated into the digital signal to be calibrated, and the second analog-to-digital converter converts the reference analog signal into the reference digital signal, the voltage of the first analog-to-digital converter and the voltage of the second analog-to-digital converter are provided by the tester, compared with the analog-to-digital conversion performed by using a single analog-to-digital converter, different analog signals can be better processed by the two analog-to-digital converters without influencing the conversion sequence, meanwhile, due to the fact that the detection is performed on a plurality of components, the conversion process of the analog signal to be calibrated is not influenced, and the accuracy of the calibration is further improved.
Specifically, the analog signal to be calibrated and the reference analog signal are processed as follows, wherein the analog signal to be calibrated is: the method comprises the steps of converting an analog signal to be calibrated into a first continuous curve which is distributed according to time, obtaining the most stable analog curve to be calibrated in the first continuous curve, and converting the most stable analog curve to be calibrated into a digital signal to be calibrated, wherein the length of the whole analog signal to be calibrated is long, the number of components to be detected is large, in order to improve the detection speed and not to reduce the detection accuracy, a section of the analog signal to be calibrated is selected for calibration, and the characteristics of the whole first continuous curve are marked by the most stable analog curve to be calibrated.
The method specifically describes how to obtain the most stable to-be-calibrated analog curves, the first continuous curve is divided into a plurality of to-be-calibrated analog curves in an average mode according to a preset time period, the preset time period can be divided according to the length of the first continuous curve, in general, the first continuous curve is divided into at least three sections at least, the highest value and the lowest value of each to-be-calibrated analog curve are determined, the to-be-calibrated analog curve with the smallest difference between the highest value and the lowest value in the same to-be-calibrated analog curve is determined to be the most stable to-be-calibrated analog curve, the stability of the curve can be well represented through the highest value and the lowest value of a certain section, and therefore data information obtaining work is carried out through the most stable to-be-calibrated analog curve.
In order to better compare the analog signal to be calibrated with the reference analog signal, the reference analog signal is converted into a second continuous curve which is arranged according to time, the reference analog curve which is in the second continuous curve and has the same time period as the most stable analog curve to be calibrated is determined, the reference analog curve is converted into a reference digital signal, and the two signals in the same time period are compared, so that the current state of the data is better obtained, and the influence of different time periods can be avoided.
The application compares the average value of the digital signal to be calibrated and the average value of the reference digital signal, and particularly, the first processing comparison unit obtains the average value of the digital signal to be calibrated and the average value of the reference digital signal, the difference value between the average value of the signal to be calibrated and the average value of the reference digital signal is taken as the difference value, the average value can better reflect the real-time state of the current two digital signals, and the difference degree of the two digital signals is better reflected in numerical value.
When the difference degree is in a preset range, determining that the digital signal to be calibrated is a normal signal; when the difference is not within the preset range, the digital signal to be calibrated is determined to be an abnormal signal, the preset range can be adjusted according to the actual test requirement, for example, the preset range can be determined according to the accuracy of the analog-to-digital converter and the specification of the chip to be calibrated. For example, the specification of the component to be calibrated requires that the signal error is less than 20mv, the analog-to-digital converter is 20-bit accurate and 5v is the reference voltage, and then the threshold value can be set to 1 least significant bit, namely about 10mv. In specific implementation, the difference value between the digital signal to be calibrated and the reference digital signal can reflect the deviation between the value of the signal generated by the signal generator in the component to be calibrated and the target value, if the deviation is within the preset difference value range, the component to be calibrated is indicated to meet the requirement of calibration, the calibration can be completed, and the calibration result is generated; if the deviation is not within the preset range, the calibration can be continued.
And for components to be calibrated which are not in a preset range, the calibration system further comprises a main controller, wherein the main controller is connected to the first processing comparison unit and the signal generator to be calibrated, and when the difference degree is not in the preset range, the main controller adjusts the configuration of the signal generator to be calibrated.
When updating the configuration of the signal generator to be calibrated, the gear set during each updating can be determined according to various algorithms so as to more rapidly approach the gear corresponding to the target value, the algorithm can also be used for configuring the signal generator by combining the difference value between the digital signal to be calibrated and the reference digital signal, specifically, the average value of the adjusted digital signal generated by the signal generator to be calibrated is adjusted to be within a preset average value, the preset average value can be divided by an actual algorithm, and the average value of the reference digital signal can also be properly adjusted according to an actual inspection process and is positioned within the preset average value.
It is to be understood that the above examples of the present application are provided for clarity of illustration only and are not limiting of the embodiments of the present application. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are desired to be protected by the following claims.
Claims (8)
1. A calibration system based on an analog-to-digital converter is characterized by comprising a signal generator to be calibrated, a reference signal generator, a first analog-to-digital converter, a second analog-to-digital converter and a first processing comparison unit,
the signal generator generates an analog signal to be calibrated and transmits the analog signal to be calibrated to the first analog-to-digital converter, the first analog-to-digital converter converts the analog signal to be calibrated into a digital signal to be calibrated,
the reference signal generator generates a reference analog signal and transmits the reference analog signal to the second analog-to-digital converter, which converts the reference analog signal into a reference digital signal,
the first processing comparison unit acquires the digital signal to be calibrated and the reference digital signal, compares the digital signal to be calibrated and the reference digital signal to determine the difference degree, and determines a calibration result according to the difference degree.
2. The analog-to-digital converter based calibration system of claim 1, wherein said converting said analog signal to be calibrated to a digital signal to be calibrated comprises:
and converting the analog signal to be calibrated into a first continuous curve which is arranged according to time, obtaining the most stable analog curve to be calibrated in the first continuous curve, and converting the most stable analog curve to be calibrated into a digital signal to be calibrated.
3. The analog-to-digital converter based calibration system of claim 2, wherein said obtaining the most stable analog curve to be calibrated of said first continuous curve comprises:
and dividing the first continuous curve into a plurality of to-be-calibrated analog curves on average according to a preset time period, determining the highest value and the lowest value of each to-be-calibrated analog curve, and determining the to-be-calibrated analog curve with the smallest difference between the highest value and the lowest value in the same to-be-calibrated analog curve as the most stable to-be-calibrated analog curve.
4. A calibration system based on an analog-to-digital converter according to claim 3, wherein said converting said reference analog signal into a reference digital signal comprises:
and converting the reference analog signal into a second continuous curve which is arranged in time, determining a reference analog curve in the second continuous curve, which has the same time period as the most stable analog curve to be calibrated, and converting the reference analog curve into the reference digital signal.
5. An analog-to-digital converter based calibration system according to claim 1, wherein said obtaining said digital signal to be calibrated and said reference digital signal and comparing them to determine a degree of difference comprises:
the first processing comparison unit obtains an average value of the digital signal to be calibrated and an average value of the reference digital signal, and a difference value between the average value of the digital signal to be calibrated and the average value of the reference digital signal is used as the difference degree.
6. The analog-to-digital converter based calibration system of claim 5, wherein said determining a calibration result based on said degree of variance comprises:
when the difference degree is in a preset range, determining that the digital signal to be calibrated is a normal signal; and when the difference degree is not in the preset range, determining that the digital signal to be calibrated is an abnormal signal.
7. The analog-to-digital converter based calibration system of claim 6, further comprising a master controller coupled to said first processing comparison unit and said signal generator to be calibrated, said master controller adjusting a configuration of said signal generator to be calibrated when said degree of variance is not within a preset range.
8. The analog-to-digital converter based calibration system of claim 1, wherein said adjusting the configuration of the signal generator to be calibrated comprises:
and adjusting the average value of the adjusted digital signals generated by the signal generator to be calibrated to be within a preset average value, wherein the average value of the reference digital signals is within the preset average value.
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