CN105337615A - Method for generating high-accuracy DAC voltage - Google Patents
Method for generating high-accuracy DAC voltage Download PDFInfo
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- CN105337615A CN105337615A CN201510864979.1A CN201510864979A CN105337615A CN 105337615 A CN105337615 A CN 105337615A CN 201510864979 A CN201510864979 A CN 201510864979A CN 105337615 A CN105337615 A CN 105337615A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000003139 buffering effect Effects 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 239000000872 buffer Substances 0.000 abstract 1
- 238000012958 reprocessing Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention discloses a method for generating high-accuracy DAC voltage. The method includes the following steps that s1, an MCU transmits a communication command to a DAC; s2, the DAC generates analog voltage U1 after receiving the command of the MCU and then inputs the analog voltage U1 into a buffering and filtering circuit; s3, the buffering and filtering circuit buffers the input analog voltage U1 and outputs analog voltage U2 after filtering processing. The method is characterized by further including the steps that the buffering and filtering circuit outputs the analog voltage U2 to an analog measuring circuit; s4, the analog measuring circuit feeds the input analog voltage U2 back to the DAC in a communication command form; the step s2 is repeated till the high-accuracy analog voltage meeting requirements is output. According to the method, the inherent error of the circuits is considered; the measuring circuit for the output result is additionally arranged, the inherent error is eliminated, and therefore output accuracy is improved.
Description
Technical field
The invention belongs to circuit engineering field, specifically relate to a kind of method producing high accuracy DAC voltage.
Background technology
DAC(Digitaltoanalogconverter) i.e. digital analog converter is a kind of equipment being analog signal with formal transformations such as electric current, voltage or electric charges by digital signal.In a lot of digital system, such as in computer systems, which, signal carries out storing and transmitting in a digital manner, because these signals can be converted to analog signal by digital analog converter and DAC, thus them can be made to be identified by the external world such as people or other nonnumeric systems, therefore, DAC obtains and applies more and more widely.
In the actual production life of electron trade, people often can run into needs continuously adjustable analog voltage as the occasion comparing reference, thus uses DAC module and high accuracy output voltage required by making it to produce just becomes and is extremely necessary.
In prior art, the method producing the voltage that meets the requirements mainly contains: the analog voltage required by 1, realizing by simple potentiometer manual adjustments; 2, with the digital adjustable analog voltage that digital regulation resistance+processor realizes; 3, the digital adjustable analog voltage adopting DAC module to realize.
But because circuit inevitably also exists intrinsic error, processing mode of the prior art all fails effectively to eliminate the intrinsic error of circuit, and it is large that the voltage using said method to produce also exists Output rusults error, the not high and defects such as adjustment trouble of precision.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide the method for the generation high accuracy DAC voltage that a kind of Output rusults error is little, precision is high, the technical scheme that the present invention solves the employing of its technical problem is:
Produce a method for high accuracy DAC voltage, comprise the following steps:
Step s1: Micro-processor MCV assigns communication instruction to DAC D/A converter module;
Step s2:DAC D/A converter module produces analog voltage U1 after receiving the instruction of Micro-processor MCV, and then described analog voltage U1 is inputted buffering and filter circuit;
Step s3: described buffering and the filter circuit analog voltage U1 to input cushions, export analog voltage U2 after filtering process;
Key is, also comprises and described buffering and filter circuit are exported the step s4 that analog voltage U2 inputs analog measuring circuit;
The analog voltage U2 of input is fed back to DAC D/A converter module with the form of communication instruction by analog measuring circuit;
Repeat step s2, until export satisfactory high-precision analog voltage.
The present invention solves the further technical scheme of its technical problem and also comprises:
Before step s2, also comprise the step to described DAC D/A converter module input reference voltage, described reference voltage input terminal is connected with high precision reference voltage output.
The determination of described reference voltage comprises the steps:
Step a1: system initialization;
Step a2: export analog voltage with maximum and measure the magnitude of voltage of output;
Step a3: export analog voltage with minimum value and measure the magnitude of voltage of output;
Step a4: the digital input value calculating the best of the digital-to-analogue conversion required for voltage that user inputs;
Step a5: calculated value is write DAC D/A converter module and complete output.
In step a4, the method calculating best digital input value is specially:
If represent that user inputs with inputValaue;
Maximum analog voltage output value is represented with maxOutVolt;
The digital-to-analogue conversion input value that maximum analog voltage output value is corresponding is represented with maxDacInput;
Minimum simulation voltage output value is represented with minOutVolt;
The result of calculation to digital to analog converter input is represented with inputDacValaue;
So,
inputDacValaue=inputValaue/（（maxOutVolt-minOutVolt）/maxDacInput）。
Compared with prior art, Advantageous Effects of the present invention is: method of the present invention considers the intrinsic error that circuit exists, and adds and removes intrinsic error to the measuring circuit of Output rusults, thus improve output accuracy.
Accompanying drawing explanation
Fig. 1 is the system block diagram of the inventive method;
Fig. 2 is the numerical computation method flow chart of the best D/A converter module input of the present invention.
Embodiment
Below in conjunction with accompanying drawing, further describe the specific embodiment of the present invention.
Refer to Fig. 1, a kind of method producing high accuracy DAC voltage of the present invention, comprises the following steps:
Step s1: Micro-processor MCV assigns communication instruction to DAC D/A converter module;
Step s2:DAC D/A converter module produces analog voltage U1 after receiving the instruction of Micro-processor MCV, and then described analog voltage U1 is inputted buffering and filter circuit;
Step s3: described buffering and the filter circuit analog voltage U1 to input cushions, export analog voltage U2 after filtering process;
Key is, also comprises and described buffering and filter circuit are exported the step s4 that analog voltage U2 inputs analog measuring circuit;
The analog voltage U2 of input is fed back to DAC D/A converter module with the form of communication instruction by analog measuring circuit;
Repeat step s2, until export satisfactory high-precision analog voltage.
In the present invention, we can arrange a normal voltage U0, if in step s3, through buffering, to export analog voltage U2 after filtering reprocessing little with normal voltage U0 deviation, then the direct satisfactory high-precision analog voltage of output; If through buffering, export analog voltage U2 after filtering reprocessing and normal voltage U0 deviation is larger, then U2 is fed back in DAC D/A converter module with the form of communication instruction and form a feedback loop, carrying out again through DAC D/A converter module and buffering and filter circuit processes, till exporting satisfactory high-precision analog voltage.
As preferably, method of the present invention is before step s2, and also comprise the step to described DAC D/A converter module input reference voltage, described reference voltage input terminal is connected with high precision reference voltage output.
The determination of reference voltage of the present invention comprises the steps:
Step a1: system initialization;
Step a2: export analog voltage with maximum and measure the magnitude of voltage of output;
Step a3: export analog voltage with minimum value and measure the magnitude of voltage of output;
Step a4: the digital input value calculating the best of the digital-to-analogue conversion required for voltage that user inputs;
Step a5: calculated value is write DAC D/A converter module and complete output.
As preferably, the present invention is in step a4, and the method calculating best digital input value is specially:
With inputValaue, we represent that user inputs;
Maximum analog voltage output value is represented with maxOutVolt;
The digital-to-analogue conversion input value that maximum analog voltage output value is corresponding is represented with maxDacInput;
Minimum simulation voltage output value is represented with minOutVolt;
The result of calculation to digital to analog converter input is represented with inputDacValaue;
So,
inputDacValaue=inputValaue/（（maxOutVolt-minOutVolt）/maxDacInput）。
So far, the input process of whole reference voltage completes.
In the present invention, the output analog voltage after buffering, filtering reprocessing feeds back in DAC D/A converter module by analog measuring circuit, removes intrinsic error, thus improves output accuracy.
These are only preferred embodiment of the present invention, not in order to limit the present invention, protection scope of the present invention is as the criterion with claims, and other its structures all are identical with the present invention or similar with principle, all should be included within protection scope of the present invention.
Claims (4)
1. produce a method for high accuracy DAC voltage, comprise the following steps:
Step s1: Micro-processor MCV assigns communication instruction to DAC D/A converter module;
Step s2:DAC D/A converter module produces analog voltage U1 after receiving the instruction of Micro-processor MCV, and then described analog voltage U1 is inputted buffering and filter circuit;
Step s3: described buffering and the filter circuit analog voltage U1 to input cushions, export analog voltage U2 after filtering process;
It is characterized in that, also comprise and described buffering and filter circuit are exported the step s4 that analog voltage U2 inputs analog measuring circuit;
The analog voltage U2 of input is fed back to DAC D/A converter module with the form of communication instruction by analog measuring circuit;
Repeat step s2, until export satisfactory high-precision analog voltage.
2. a kind of method producing high accuracy DAC voltage according to claim 1, it is characterized in that, before step s2, also comprise the step to described DAC D/A converter module input reference voltage, described reference voltage input terminal is connected with high precision reference voltage output.
3. a kind of method producing high accuracy DAC voltage according to claim 2, it is characterized in that, the determination of described reference voltage comprises the steps:
Step a1: system initialization;
Step a2: export analog voltage with maximum and measure the magnitude of voltage of output;
Step a3: export analog voltage with minimum value and measure the magnitude of voltage of output;
Step a4: the digital input value calculating the best of the digital-to-analogue conversion required for voltage that user inputs;
Step a5: calculated value is write DAC D/A converter module and complete output.
4. a kind of method producing high accuracy DAC voltage according to claim 3, is characterized in that, in step a4, the method calculating best digital input value is specially:
If represent that user inputs with inputValaue;
Maximum analog voltage output value is represented with maxOutVolt;
The digital-to-analogue conversion input value that maximum analog voltage output value is corresponding is represented with maxDacInput;
Minimum simulation voltage output value is represented with minOutVolt;
The result of calculation to digital to analog converter input is represented with inputDacValaue;
So,
inputDacValaue=inputValaue/（（maxOutVolt-minOutVolt）/maxDacInput）。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510864979.1A CN105337615A (en) | 2015-12-01 | 2015-12-01 | Method for generating high-accuracy DAC voltage |
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| CN201510864979.1A CN105337615A (en) | 2015-12-01 | 2015-12-01 | Method for generating high-accuracy DAC voltage |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307749A (en) * | 1998-06-30 | 2001-08-08 | 夸尔柯姆股份有限公司 | Method and apparatus for d.c. offset carrection in digital-to-analog converters |
| CN202231703U (en) * | 2011-09-14 | 2012-05-23 | 深圳市亿维自动化技术有限公司 | Self-calibration circuit for digital-to-analog conversion output voltage |
| CN102571089A (en) * | 2011-12-31 | 2012-07-11 | 北京雪迪龙科技股份有限公司 | Analog-to-digital conversion/digital-to-analog conversion self-calibration method and control system applying same |
| CN102653168A (en) * | 2011-03-02 | 2012-09-05 | 北京美科艺数码科技发展有限公司 | Nozzle driving circuit for inkjet printers |
| CN104980155A (en) * | 2014-04-07 | 2015-10-14 | 美国亚德诺半导体公司 | Cancellation of feedback digital-to-analog converter errors in multi-stage delta-sigma analog-to-digital converters |
-
2015
- 2015-12-01 CN CN201510864979.1A patent/CN105337615A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1307749A (en) * | 1998-06-30 | 2001-08-08 | 夸尔柯姆股份有限公司 | Method and apparatus for d.c. offset carrection in digital-to-analog converters |
| CN102653168A (en) * | 2011-03-02 | 2012-09-05 | 北京美科艺数码科技发展有限公司 | Nozzle driving circuit for inkjet printers |
| CN202231703U (en) * | 2011-09-14 | 2012-05-23 | 深圳市亿维自动化技术有限公司 | Self-calibration circuit for digital-to-analog conversion output voltage |
| CN102571089A (en) * | 2011-12-31 | 2012-07-11 | 北京雪迪龙科技股份有限公司 | Analog-to-digital conversion/digital-to-analog conversion self-calibration method and control system applying same |
| CN104980155A (en) * | 2014-04-07 | 2015-10-14 | 美国亚德诺半导体公司 | Cancellation of feedback digital-to-analog converter errors in multi-stage delta-sigma analog-to-digital converters |
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