CN109245767A - A kind of software-based ADC automatic calibrating method - Google Patents
A kind of software-based ADC automatic calibrating method Download PDFInfo
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- CN109245767A CN109245767A CN201811248536.XA CN201811248536A CN109245767A CN 109245767 A CN109245767 A CN 109245767A CN 201811248536 A CN201811248536 A CN 201811248536A CN 109245767 A CN109245767 A CN 109245767A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/10—Calibration or testing
- H03M1/1009—Calibration
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Abstract
The present invention relates to a kind of software-based ADC automatic calibrating methods, wherein includes: setting externally input reference voltage y1, times of collection m；From programme control precision standard source output voltage y1 to ADC acquisition system；M acquisition operation is carried out, removes maximum value after collection result is sorted and minimum value is averaged x1, the measured value as reference voltage value y1；Step 4, externally input reference voltage y2, times of collection n are set；From programme control precision standard source output voltage y2 to ADC acquisition system；Remove maximum value after collection result is sorted and minimum value is averaged x2, the measured value as reference voltage value y2；Calculate calibration factor a=(y1-y2)/(x1-x2), b=y1- (y1-y2)/(x1-x2) * x1；Other voltage values y3 is exported from programme control precision standard source, collected voltage x3 is read, compensates error, if error is larger, re-starts adjustment, until error is acceptable.
Description
Technical field
The present invention relates to analog-digital converter technology, in particular to a kind of software-based ADC automatic calibrating method.
Background technique
With the development of science and technology, analog-digital converter (Analog to Digital Converter, ADC) obtains
Very extensive application has huge application in the fields such as wireless communication, digital instrumentation, medical imaging, high definition television
Prospect.Most of signal in nature exists all in the form of analog signal, and ADC is as connection simulated world and digital world
Bridge, carry important task that is analog signal is reported as precisely as possible, being rapidly converted into corresponding digital signal, be signal processing system
System whether successful key factor.
Typical ADC converts analog signals into the digital signal of certain proportion voltage value.Preferably ADC transformation model is
One linear function, analog signal can be put before carrying out conversion ADC by signal conditioning circuit, isolation operation in practical application
The processing such as big device, to introduce error.Laser trimming is the ADC collimation technique of early application, but this technology has destructiveness,
The injury caused by calibrating for the first time can not be reversed, there is certain limitation, so in recent years gradually by various self calibration skills
Replaced art.Self-calibration technique is compensated by ADC system itself detection error, can be divided into mould again by required circuit types
Quasi- calibration and digital calibration.
Summary of the invention
The purpose of the present invention is to provide a kind of software-based ADC automatic calibrating methods, for solving above-mentioned existing skill
The problem of art.
A kind of software-based ADC automatic calibrating method of the present invention, wherein include: the electricity for setting and being exported through ADC acquisition system
Pressure value is measured value x, value y on the basis of the voltage value exported by programme control precision standard source, and a reference value=a* measured value+b is expressed as
Y=a*x+b；Step 1, externally input reference voltage y1, times of collection m are set；Step 2, it is exported from programme control precision standard source
Voltage y1 to ADC acquisition system；Step 3, m acquisition operation is carried out, removes maximum value and minimum value after collection result is sorted
It is averaged x1, the measured value as reference voltage value y1；Step 4, externally input reference voltage y2, times of collection n are set；
Step 5, from programme control precision standard source output voltage y2 to ADC acquisition system；Step 6, n times acquisition operation is carried out, acquisition is tied
Remove maximum value after fruit sequence and minimum value is averaged x2, the measured value as reference voltage value y2；Step 7, pass through equation
Group y1=a*x1+b and y2=a*x2+b calculates calibration factor a=(y1-y2)/(x1-x2), b=y1- (y1-y2)/(x1-x2) *
x1；Step 8, other voltage values y3 is exported from programme control precision standard source, reads collected voltage x3, passes through formula y=a*x+b
Error is compensated, if error is larger, 1-7 is re-execute the steps and is adjusted, until error is acceptable, executes step 9；Step
9, each channel of ADC is calibrated all in accordance with step 1-8.
One embodiment of software-based ADC automatic calibrating method according to the present invention, wherein updated after the completion of calibration pre-
The calibration parameter file set.
One embodiment of software-based ADC automatic calibrating method according to the present invention, wherein inside ADC acquisition system
Circuit includes cable and connector, signal conditioning circuit, isolation operational amplifier and ADC chip.
Software-based ADC automatic calibrating method of the invention can be at any time using soft under the premise of not modifying hardware
The method of part calibrates ADC, and is directed to application, and calibration region is adjusted flexibly, accomplishes sectional calibration.
Detailed description of the invention
Fig. 1 show system connection schematic diagram；
Fig. 2 show software-based ADC automatic calibrating method flow chart.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to of the invention
Specific embodiment is described in further detail.
Fig. 1 show system connection schematic diagram, and Fig. 2 show software-based ADC automatic calibrating method flow chart, such as schemes
Shown in 1 and Fig. 2,
The present invention includes programme control precision standard source and ADC acquisition system, and the effect of programme control precision standard source is outputting reference
Voltage, it is also possible to carry the industrial personal computer substitution of high precision digital-to-analog converter (Digital to Analog Converter, DAC)；
ADC acquisition system includes cable and connector, signal conditioning circuit, isolation operational amplifier, ADC chip.External reference voltages
Voltage division processing is carried out by signal conditioning circuit, the voltage before converting ADC can satisfy the input voltage range of chip.
As shown in Figure 1 and Figure 2, a kind of software-based ADC automatic calibrating method of the present invention, comprising:
Arranging the voltage value exported through ADC acquisition system is measured value x, is by the voltage value that programme control precision standard source exports
A reference value y, in a certain range, the two meet linear rule, and a reference value=a* measured value+b is expressed as y=with mathematical formulae
a*x+b；
The ADC calibration method comprises the steps of:
Step 1, calibration procedure is run in ADC acquisition system, externally input reference voltage y1, times of collection m is set；
Step 2, from programme control precision standard source output voltage y1 to ADC acquisition system；
Step 3, calibration procedure executes m acquisition operation, removes maximum value after collection result is sorted and minimum value is made even
Mean value x1, the measured value as reference voltage value y1；
Step 4, externally input reference voltage y2, times of collection n is arranged in calibration procedure；
Step 5, from programme control precision standard source output voltage y2 to ADC acquisition system；
Step 6, calibration procedure executes n times acquisition operation, removes maximum value after collection result is sorted and minimum value is made even
Mean value x2, the measured value as reference voltage value y2；
Step 7, calibration factor a=(y1-y2)/(x1-x2) is calculated by equation group y1=a*x1+b and y2=a*x2+b,
B=y1- (y1-y2)/(x1-x2) * x1；
Step 8, other voltage values are exported from programme control precision standard source, is missed after collecting voltage using calibration parameter compensation
Difference re-execute the steps 1-7 and is adjusted if error is larger, until error is acceptable；
Step 9, each channel of ADC is calibrated all in accordance with above step, preset calibration is updated after the completion of calibration
Parameter File.
As shown in Figure 1 and Figure 2, the calibration result of an ADC channel is provided using method of the invention:
Programme control precision standard source exports 10.001V, 20.001V voltage respectively, and each acquisition 10 times is thrown away before calculating average value
Every group of maximum value and minimum value.Obtained initial data and average value is shown in Table 1.
1 acquired original test data of table
Calibration parameter a=0.989775, b=0.202468 is calculated.Data after calibration are shown in Table 2.
Data after table 2 is calibrated
Compare Tables 1 and 2 as it can be seen that error reduction after calibrating using the method for the present invention, is especially 10.001V in reference voltage
Shi Xiaoguo is obvious.To improve the conversion accuracy near 20.001V, reference voltage can be increased near the voltage value, be divided
Section sampling.
The present invention is the power supply of ADC acquisition system using programme control precision standard source, and ADC acquisition system internal circuit includes cable
With connector, signal conditioning circuit, isolation operational amplifier and ADC chip.ADC acquisition system of the invention can be certainly after powering on
Dynamic to start to convert, the time needed for the ADC chip that this example uses completes primary conversion is within 10us.The present invention calibrates
When, two groups of reference voltages y1, y2 are exported by programme control precision standard source respectively, after calibration procedure carries out multi collect to every group of voltage
Average value x1 is calculated, then x2 utilizes equation group y1=a*x1+b and y2=a*x2+b calculating parameter a and b as measured value.From
Programme control precision standard source exports several groups of other voltage values as benchmark again, collects and carries out error benefit by formula after original value
It repays, whether the calibration parameter calculated before judgement can be used.If it is available, the calibration parameter file in more new system, otherwise again
It is calibrated, until error is met the requirements；After the completion of calibration, user program obtains conversion value by AD driving interface, drives journey
Calibration parameter file, which can be read automatically, inside sequence carries out error compensation.
In conclusion the technical solution adopted by the present invention design is simple and convenient to operate, the benchmark that can be inputted with flexible setting
Voltage value, the extreme value number arranging times of collection and giving up when calculating average value, to improve calibration accuracy.In entire mistake
Cheng Zhong, does not need to modify to hardware circuit or programming program again, reduces operation difficulty, calibrates convenient for staff
ADC device.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (3)
1. a kind of software-based ADC automatic calibrating method characterized by comprising
If the voltage value exported through ADC acquisition system is measured value x, it is worth on the basis of the voltage value exported by programme control precision standard source
Y, a reference value=a* measured value+b, is expressed as y=a*x+b；
Step 1, externally input reference voltage y1, times of collection m are set；
Step 2, from programme control precision standard source output voltage y1 to ADC acquisition system；
Step 3, m acquisition operation is carried out, removes maximum value after collection result is sorted and minimum value is averaged x1, as base
The measured value of quasi- voltage value y1；
Step 4, externally input reference voltage y2, times of collection n are set；
Step 5, from programme control precision standard source output voltage y2 to ADC acquisition system；
Step 6, n times acquisition operation is carried out, removes maximum value after collection result is sorted and minimum value is averaged x2, as base
The measured value of quasi- voltage value y2；
Step 7, calibration factor a=(y1-y2)/(x1-x2), b=are calculated by equation group y1=a*x1+b and y2=a*x2+b
y1-(y1-y2)/(x1-x2)*x1；
Step 8, other voltage values y3 is exported from programme control precision standard source, reads collected voltage x3, passes through formula y=a*x+
B compensates error, if error is larger, re-execute the steps 1-7 and is adjusted, and until error is acceptable, executes step 9；
Step 9, each channel of ADC is calibrated all in accordance with step 1-8.
2. software-based ADC automatic calibrating method as described in claim 1, which is characterized in that updated after the completion of calibration pre-
The calibration parameter file set.
3. software-based ADC automatic calibrating method as described in claim 1, which is characterized in that electricity inside ADC acquisition system
Road includes cable and connector, signal conditioning circuit, isolation operational amplifier and ADC chip.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545103A (en) * | 2019-10-15 | 2019-12-06 | 上海磐启微电子有限公司 | ADC calibration method based on least square method |
| CN110907721A (en) * | 2019-11-08 | 2020-03-24 | 浙江高成绿能科技有限公司 | Control panel test system |
| CN112362955A (en) * | 2020-10-22 | 2021-02-12 | 深圳力维智联技术有限公司 | ADC (analog to digital converter) acquisition method, device and equipment based on self calibration and storage medium |
| CN112578270A (en) * | 2020-12-29 | 2021-03-30 | 深圳市芯天下技术有限公司 | Test method and device for automatic calibration of reference voltage, storage medium and terminal |
| CN114153786A (en) * | 2021-11-26 | 2022-03-08 | 山东云海国创云计算装备产业创新中心有限公司 | Server and SOC system thereof |
| CN114167120A (en) * | 2021-12-14 | 2022-03-11 | 国网山东省电力公司淄博供电公司 | Method for improving dynamic range and precision of low-voltage distribution network monitoring terminal measuring current |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110545103A (en) * | 2019-10-15 | 2019-12-06 | 上海磐启微电子有限公司 | ADC calibration method based on least square method |
| CN110907721A (en) * | 2019-11-08 | 2020-03-24 | 浙江高成绿能科技有限公司 | Control panel test system |
| CN112362955A (en) * | 2020-10-22 | 2021-02-12 | 深圳力维智联技术有限公司 | ADC (analog to digital converter) acquisition method, device and equipment based on self calibration and storage medium |
| CN112578270A (en) * | 2020-12-29 | 2021-03-30 | 深圳市芯天下技术有限公司 | Test method and device for automatic calibration of reference voltage, storage medium and terminal |
| CN114153786A (en) * | 2021-11-26 | 2022-03-08 | 山东云海国创云计算装备产业创新中心有限公司 | Server and SOC system thereof |
| CN114153786B (en) * | 2021-11-26 | 2023-08-04 | 山东云海国创云计算装备产业创新中心有限公司 | Server and SOC (system on chip) system thereof |
| CN114167120A (en) * | 2021-12-14 | 2022-03-11 | 国网山东省电力公司淄博供电公司 | Method for improving dynamic range and precision of low-voltage distribution network monitoring terminal measuring current |
| CN114167120B (en) * | 2021-12-14 | 2023-09-19 | 国网山东省电力公司淄博供电公司 | Method for improving dynamic range and accuracy of measuring current of low-voltage distribution network monitoring terminal |
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