CN107643095A - A kind of calibration method of sensor chip and the chip calibration programmable device of application this method - Google Patents
A kind of calibration method of sensor chip and the chip calibration programmable device of application this method Download PDFInfo
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- CN107643095A CN107643095A CN201710729449.5A CN201710729449A CN107643095A CN 107643095 A CN107643095 A CN 107643095A CN 201710729449 A CN201710729449 A CN 201710729449A CN 107643095 A CN107643095 A CN 107643095A
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Abstract
The present invention relates to a kind of calibration method of sensor chip, sample the inputoutput data of multigroup sensor chip, increase the weight coefficient of zero point corresponding data, and the input/output relation of sensor chip is obtained using least square fitting, and then obtain the calibration value of zero point and gain.The calibration method of sensor chip in the present invention, zero point, gain are calibrated respectively compared to needs of the prior art, its calibration process is simpler, can obtain accurate zero point, gain calibration value simultaneously.At the same time it can also reach the requirement for meeting sensor chip to zero point higher precision index by increasing the weight coefficient of zero point so that zero point, the gain calibration value that burning enters in sensor chip can improve the detection accuracy of sensor chip.
Description
Technical field
The present invention relates to a kind of calibration method of sensor chip, the invention further relates to a kind of application the calibration method
Chip calibrates programmable device.
Background technology
At present, conventional sensor chip calibration uses single channel calibration program, it is necessary to respectively to zero in chip calibration
Point and gain are calibrated, and then carry out repetition measurement again to complete the calibration of chip.Calibrating and general during repetition measurement
The measurement for carrying out two measurement points is calibrated with realizing, it is impossible to realizes the compromise in gamut precision very well.Simultaneously because calibration and
Repetition measurement process is complicated, then can not carry out calibration simultaneously to multiple chips.
In a calibration process, first sensor chip is connected with cd-rom recorder, zero point write-in value is preserved to sensor chip,
Wherein, zero point write-in is worth the offset output for controlling sensor chip.The first detection is carried out to sensor chip afterwards, to obtain
The first output data for obtaining sensor chip is write according to the Relation acquisition gain between the first output data and corresponding input data
Enter value.After the completion of, then gain write-in value preserved to sensor chip, wherein, gain write-in is worth for controlling sensor chip
Rated output.The second detection is carried out to sensor chip, it is defeated according to second to obtain the second output data of sensor chip
The relation adjust gain write-in value gone out between data and corresponding input data.I.e. according to the first output data and the second output data
Zero data and gain data are generated, and sensor chip is detected again according to zero data and gain data, so as to sentence
It is disconnected whether qualified to the zero point of sensor chip and gain calibration.Individually calibration zero point and the calibration of the method for gain in the prior art
Time-consuming for process, and low precision, is unfavorable for improving the precision of sensor chip.
The content of the invention
First technical problem to be solved by this invention be for above-mentioned prior art provide one kind can to zero point and
The calibration method for the sensor chip that gain is calibrated simultaneously.
Second technical problem to be solved by this invention be for above-mentioned prior art provide one kind can simultaneously to more
The chip calibration programmable device that individual sensor chip is calibrated.
Technical scheme is used by the present invention solves above-mentioned first technical problem：A kind of calibration side of sensor chip
Method, it is characterised in that：To sensor chip input test signal, sensor chip correspondingly realizes signal output；
The n measurement point including zero point is chosen in input test signal, obtains input number corresponding to each measurement point
According to
[x1,x2,x3,......,xi,......,xn], wherein i, n are natural number, 1≤i≤n；
Corresponding to each measurement point, sampling obtains output data corresponding to sensor chip
[y1,y2,y3,......,yi,......,yn]；
The input/output relation of sensor chip is obtained using least square fitting, and then obtains the school of zero point and gain
Quasi- value：
Wherein,A is zero point correction value, and b is gain calibration value.
Sensor chip is higher than the requirement of other measurement points to the index request of zero point, in order to increase zero point and gain calibration
The accuracy of value, increase the weight of zero point corresponding data to calculate and obtain the calibration value of zero point and gain；
Wherein, k1+k2+k3+......+ki+......+kn=n, kiRepresent input data xiWith output data yiIt is corresponding
Calculate weight coefficient；
For [x1,x2,x3,......,xi,......,xn] in input data x corresponding to zero pointm, m is natural number, 1≤m
≤ n, obtain [y1,y2,y3,......,yi,......,yn] in output data y corresponding to zero pointm；In formula 4,AndIn calculating weight coefficient kmMore than other each input datas and output data pair
The calculating weight coefficient answered.
A kind of application has the chip calibration programmable device of the calibration method of foregoing sensor chip, is connected with sensor chip
Connect, it is characterised in that：Calibration data is obtained including the data sampler for gathering sensor chip output data, for calculating
Central processing unit, for will calibrate data recording to sensor chip burning driver, the burning driver have with
The burning interface that the burning DLL of the sensor chip is connected；The burning driver by the burning interface with
The sensor chip is connected；The data sampler signal output part with the sensor chip, central processing respectively
Device is connected, and the data input pin of the burning driver is connected with the central processing unit.
Technical scheme is used by the present invention solves above-mentioned second technical problem：The data sampler is can be with
The multi-channel A/D C modulus collectors that the signal output part of multiple sensor chips is connected；
The burning driver is the multichannel FPGA burning drivers that can be connected with multiple sensor chips.With it is existing
Technology is compared, the advantage of the invention is that：The calibration method of sensor chip in the present invention, by obtaining sensor chip
Inputoutput data, using the corresponding relation of least square fitting input/output signal, and then sensor chip is obtained simultaneously
Zero point, gain calibration value, compared to it is of the prior art needs zero point, gain are calibrated respectively, its calibration process is more
Add simply, accurate zero point, gain calibration value can be obtained faster.At the same time it can also the weight coefficient by increasing zero point
To reach the requirement for meeting sensor chip to zero point higher precision index so that burning enters zero point in sensor chip, increased
Beneficial calibration value can improve the detection accuracy of sensor chip.
Chip calibration programmable device in the present invention, can drive by using multi-channel A/D C moduluses collector, multichannel FPGA burnings
Dynamic device realizes multichannel communication, and then carries out data acquisition and calibration to multiple sensor chips simultaneously, substantially increases
The calibration efficiency of sensor chip.
Brief description of the drawings
Fig. 1 is the flow chart of the calibration method of the sensor chip in the embodiment of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing embodiment.
Sensor can be transformed into corresponding output letter according to the input signal of reaction detection amount according to certain gain coefficient
Number to characterize detection limit.Before sensor comes into operation, then it needs to be determined that the signal gain coefficient of sensor internal, meanwhile, by
In sensor can it is affected by other factors and detection when occur null offset situation, so then need by zero point school
Quasi- value carries out school zero-compensation.
Programmable device realization is calibrated to the zero point of sensor chip, the calibration of gain by a chip in the present embodiment.It is logical
The zero point of sensor chip, gain calibration value can directly be obtained by crossing chip calibration programmable device, by the zero point of acquisition, gain school
Quasi- value burning enters in sensor chip, then sensor chip at work, can pass through the input of zero point, gain calibration value composition
Calculation formula is exported, detection obtains corresponding transducing signal.
In the present embodiment, chip calibration programmable device include be used for gather sensor chip output data data sampler,
The central processing unit of calibration data is obtained for calculating, for burning driver of the data recording to sensor chip will to be calibrated,
Burning driver has the burning interface being connected with the burning DLL of sensor chip；Burning driver is connect by burning
Mouth is connected with sensor chip；The signal output part with sensor chip, central processing unit are connected data sampler respectively,
The data input pin of burning driver is connected with central processing unit.Wherein central processing unit can use the calculating that test uses
Machine.
Data sampler in the present embodiment is the multichannel that can be connected with the signal output part of multiple sensor chips
ADC modulus collectors；Burning driver is the multichannel FPGA burning drivers that can be connected with multiple sensor chips.Such as
This, can be realized to multiple sensor chips by chip calibration programmable device while carry out calibration, substantially increase biography
The calibration efficiency of sensor chip.
Each the calibration method of sensor chip is：
By burning driver, the burning into sensor chip enters theoretical yield value to central processing unit；
According to the test request of computer installation, to sensor chip input test signal, sensor chip is corresponding to be realized
Signal output；
According to sampling request, input data [x corresponding to n measurement point in input test signal is obtained1,x2,
x3,......,xi,......,xn], wherein i, n are natural number, 1≤i≤n；Obtain output data corresponding to each measurement point simultaneously
[y1,y2,y3,......,yi,......,yn]；Wherein need input data corresponding to sampling sensor chip zero point, the zero point
It is measurement point corresponding to 0 to be often referred to input data, but the measurement point that other can also be selected to pay close attention to according to particular/special requirement
As zero point.
The input/output relation of sensor chip is obtained using least square fitting, and then obtains the school of zero point and gain
Quasi- value：
Wherein,A is zero point correction value, and b is gain calibration value.
k1+k2+k3+......+ki+......+kn=n, kiRepresent input data xiWith output data yiIt is corresponding to calculate power
Weight coefficient；
For [x1,x2,x3,......,xi,......,xn] in input data x corresponding to zero pointm, m is natural number, 1≤m
≤ n, obtain [y1,y2,y3,......,yi,......,yn] in output data y corresponding to zero pointm；In formula 4,AndIn calculating weight coefficient kmMore than other each input datas and output data pair
The calculating weight coefficient answered.The required precision of each measurement point can be balanced by weight coefficient, strengthens zero point in the present embodiment
Weight coefficient enables to sensor chip to be higher than the requirement of other points to the index request of zero point, and then meets whole sensor
The all technical requirement of chip production piece.
Central processing unit is calculated into the zero point correction value obtained and gain calibration value is written to by burning driver burning
In sensor chip.Then repetition measurement is carried out to sensor chip, whether the testing result of detection sensor chip meets design will
Ask, if qualified, complete the calibration to the sensor chip, the school of foregoing sensor chip is utilized if unqualified
Quasi- method, measurement point is chosen again and carries out calibration.
Claims (4)
- A kind of 1. calibration method of sensor chip, it is characterised in that：To sensor chip input test signal, sensor chip It is corresponding to realize signal output；The n measurement point including zero point is chosen in input test signal, obtains input data [x corresponding to each measurement point1, x2,x3,......,xi,......,xn], wherein i, n are natural number, 1≤i≤n；Corresponding to each measurement point, sampling obtains output data [y corresponding to sensor chip1,y2,y3,......,yi,......, yn]；The input/output relation of sensor chip is obtained using least square fitting, and then obtains the calibration of zero point and gain Value：Wherein,A is zero point correction value, and b is gain calibration value.
- 2. the calibration method of sensor chip according to claim 1, it is characterised in that：Increase the power of zero point corresponding data Weight obtains the calibration value of zero point and gain to calculate；Wherein, k1+k2+k3+......+ki+......+kn=n, kiRepresent input data xiWith output data yiCorresponding calculating Weight coefficient；For [x1,x2,x3,......,xi,......,xn] in input data x corresponding to zero pointm, m is natural number, 1≤m≤n, Obtain [y1,y2,y3,......,yi,......,yn] in output data y corresponding to zero pointm；In formula 4,AndIn calculating weight coefficient kmMore than other each input datas and output data pair The calculating weight coefficient answered.
- 3. a kind of application has the chip calibration programmable device of the calibration method of described sensor chip as claimed in claim 1 or 2, with biography Sensor chip is connected, it is characterised in that：Including the data sampler for gathering sensor chip output data, for calculating Obtain the central processing unit of calibration data, for data recording will to be calibrated to the burning driver of sensor chip, the burning Driver has the burning interface being connected with the burning DLL of the sensor chip；The burning driver passes through institute Burning interface is stated with the sensor chip to be connected；The data sampler signal output with the sensor chip respectively End, central processing unit are connected, and the data input pin of the burning driver is connected with the central processing unit.
- 4. chip according to claim 3 calibrates programmable device, it is characterised in that：The data sampler for can with it is multiple The multi-channel A/D C modulus collectors that the signal output part of sensor chip is connected；The burning driver is the multichannel FPGA burning drivers that can be connected with multiple sensor chips.
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| CN112611485A (en) * | 2020-11-27 | 2021-04-06 | 航宇救生装备有限公司 | Method for determining linearity of parachute opening force sensor |
| CN114265376A (en) * | 2021-12-07 | 2022-04-01 | 中国电子科技集团公司第四十八研究所 | Debugging method and batch debugging system for ZMD31050 chip |
| CN115951289A (en) * | 2023-02-20 | 2023-04-11 | 重庆云宸新能源科技有限公司 | Current sensor zero calibration system and method and electric automobile |
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