CN104639173A - Arbitrary waveform generator direct-current calibrating method based on recursion theory - Google Patents
Arbitrary waveform generator direct-current calibrating method based on recursion theory Download PDFInfo
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- CN104639173A CN104639173A CN201410709952.0A CN201410709952A CN104639173A CN 104639173 A CN104639173 A CN 104639173A CN 201410709952 A CN201410709952 A CN 201410709952A CN 104639173 A CN104639173 A CN 104639173A
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Abstract
The invention provides an arbitrary waveform generator direct-current calibrating method based on recursion theory. By the arbitrary waveform generator direct-current calibrating method, analog output calibration can be quickly realized, production efficiency is improved multiple times, and production cost is reduced. The arbitrary waveform generator direct-current calibrating method includes steps of (1) determining output error limit according to accuracy requirements of analog output; (2) calculating optimization coefficient a according to analog output signal amplitude range and DA resolution ratio; (3) configuring to enable analog output, wherein data size is a stored calibration value X; (4) measuring output and calculating output difference delta; (5) calculating to obtain calibration value C of this time according to the stored calibration value X and the current output difference delta, storing the value C and replacing the value X with the value C; (6) configuring DA output code values as the value C; (7) judging whether the output is within the error limit range or not, if not, repeating the steps (4) to (7) until requirements are met.
Description
Technical field
The invention belongs to modulating output technical field of measurement and test, particularly a kind of AWG (Arbitrary Waveform Generator) direct current calibration steps based on recurrence thought.
Background technology
For ensureing the output accuracy of modulating output, calibration process must be carried out to modulating output.Traditional modulating output calibration steps adopts setting fiducial value then Continuous accumulation consistent difference, in the hope of final calibration value, conventional method is based on " conjecture " thought, and at substantial time energy, virtually adds human and material resources input and in a disguised form add production cost.
Summary of the invention
The technical problem to be solved in the present invention breaks through existing modulating output calibration " conjecture " thought category, a kind of AWG (Arbitrary Waveform Generator) direct current calibration steps based on recurrence thought is proposed, modulating output calibration can be realized fast, production efficiency is improved several times, thus reduce production cost.
For solving the problems of the technologies described above, technical scheme of the present invention is as follows:
Based on an AWG (Arbitrary Waveform Generator) direct current calibration steps for recurrence thought, comprise the following steps:
(1) according to the required precision of modulating output, determine that output error is limit;
(2) according to analog output signal amplitude range and DA resolution, optimized coefficients a is calculated;
(3) configure enable modulating output, data volume is for deposit calibration value X;
(4) measurement exports and calculates and exports difference △;
(5) according to depositing calibration value X and current output difference △, calculating this calibration value C, storing C and X numerical value is replaced with C value;
(6) configuring DA output code value is C value;
(7) judge current output whether within the scope of the limits of error, do not meet and then repeat step (4) ~ (7), until meet the demands.
Accompanying drawing explanation
Fig. 1 is that the modulating output that the present invention is correlated with realizes principle general structure schematic diagram;
Fig. 2 is a kind of calibration steps flow chart of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is that the modulating output that the present invention is correlated with realizes principle general structure schematic diagram.As shown in the figure, effective digital code value delivers to D/A converter, analog signal after conversion delivers to modulate circuit, modulate circuit generally comprises several links such as filtering, decay, amplification, signal after conditioning is actual modulating output, after too many levels process, well imagine certainly there is error between actual modulating output and theoretical value, therefore must calibrate.
Fig. 2 is the flow chart of algorithm realization, and concrete steps when using this algorithm to carry out realistic simulation calibration operation are:
S0: calculate the limits of error and calibration factor a, a=(C
h-C
l)/(V
h-V
l), C in formula
h, C
lbe respectively maximum and minimum value that DA chip effectively inputs digital quantity, V
h, V
lbe respectively maximum amplitude and the minimum amplitude of analog output signal;
S1: modulating output is connected to digital multimeter, digital versatile meter accuracy will much larger than modulating output required precision;
S2: read the calibration value X stored, and input DA chip;
S3: configuration modulating output is enable, reads the measured value of digital multimeter;
S4: calculate according to measured value and export difference △;
S5: according to a, X, △, calculates this calibration value C=X+a* △;
S6: C is inputted DA chip, measures current actual output again after output enable;
S7: judge whether current actual output meets limits of error requirement, does not meet and then repeats S4 ~ S7, meet and perform step S8;
S8: calibration terminates.
Calibration example:
Suppose that DA is 16Bit resolution, and there is the good linearity, then C
h, C
lbe respectively 65535,0, and the amplitude range of analog output signal is-10V ~ 10V, output accuracy is ± (0.1% set point+5mV), zero point error the is limited to (-5mV ~ 5mV) C after signal condition
hcorresponding realistic simulation exports as 10.5V, C
lcorresponding realistic simulation exports as-11.0V, then coefficient a=(65535-0)/(10-(-10))=3276.75.
For embodying the fast convergence of this algorithm, suppose that former calibration value X when calibrating zero point is 65535, then corresponding with zero point actual output difference is 0-10.5V=-10.5V, and can obtain C=65535-3276.75*10.5=31129.125 after first time execution S5, rounding is 31129; Former X value is changed into 31129 and stored, and the actual output according to assumed condition then 31129 correspondences is-0.7875V, then circulation second time can obtain C=31129-3276.75* (-0.7875)=33709.44 after performing S5; Former X value is changed into 33709 and stored, actual output according to assumed condition then 33709 correspondences is 0.05887V, then can obtain C=33709-3276.75* (0.0588)=33517 after circulation third time execution S5, actual output according to assumed condition then 33517 correspondences is-0.004V, meet limits of error requirement, zero point correction completes.
Claims (3)
1., based on an AWG (Arbitrary Waveform Generator) direct current calibration steps for recurrence thought, it is characterized in that, comprise the following steps:
(1) according to the required precision of modulating output, determine that output error is limit;
(2) according to analog output signal amplitude range and DA resolution, calibration factor a is calculated;
(3) configure enable modulating output, data volume is for deposit calibration value X;
(4) measurement exports and calculates and exports difference △;
(5) according to depositing calibration value X and current output difference △, calculating this calibration value C, storing C and X numerical value is replaced with C value;
(6) configuring DA output code value is C value;
(7) judge current output whether within the scope of the limits of error, do not meet and then repeat step (4) ~ (7), until meet the demands.
2. a kind of AWG (Arbitrary Waveform Generator) direct current calibration steps based on recurrence thought as claimed in claim 1, it is characterized in that, the calculating of described calibration factor is based on DAC resolution and modulating output scope.
3. the modulating output calibration algorithm of Fast Convergent as claimed in claim 2, is characterized in that, carry out each calibration operation all based on calibration factor, present day analog output valve and current calibration value, recalculate calibration value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410709952.0A CN104639173A (en) | 2014-11-27 | 2014-11-27 | Arbitrary waveform generator direct-current calibrating method based on recursion theory |
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| CN201410709952.0A CN104639173A (en) | 2014-11-27 | 2014-11-27 | Arbitrary waveform generator direct-current calibrating method based on recursion theory |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292837A (en) * | 2016-07-26 | 2017-01-04 | 中国电子科技集团公司第四十研究所 | A kind of call method of AWG (Arbitrary Waveform Generator) amplitude calibration data |
| CN110824212A (en) * | 2019-11-05 | 2020-02-21 | 山东浪潮人工智能研究院有限公司 | Multichannel arbitrary waveform generator correction method and system |
| CN114280522A (en) * | 2021-12-24 | 2022-04-05 | 贵州航天计量测试技术研究所 | Pulse counting calibration device and method for pulse counter |
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| CN101072040A (en) * | 2007-06-13 | 2007-11-14 | 鼎芯通讯（上海）有限公司 | Method and device for suppressing carrier leakage |
| US20110163901A1 (en) * | 2009-07-16 | 2011-07-07 | Microchip Technology Incorporated | 2-phase gain calibration and scaling scheme for switched capacitor sigma-delta modulator using a chopper voltage reference |
| CN103580715A (en) * | 2013-11-19 | 2014-02-12 | 中国科学院半导体研究所 | WLAN transceiver with carrier leakage correction and compensation functions |
-
2014
- 2014-11-27 CN CN201410709952.0A patent/CN104639173A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101072040A (en) * | 2007-06-13 | 2007-11-14 | 鼎芯通讯（上海）有限公司 | Method and device for suppressing carrier leakage |
| US20110163901A1 (en) * | 2009-07-16 | 2011-07-07 | Microchip Technology Incorporated | 2-phase gain calibration and scaling scheme for switched capacitor sigma-delta modulator using a chopper voltage reference |
| CN103580715A (en) * | 2013-11-19 | 2014-02-12 | 中国科学院半导体研究所 | WLAN transceiver with carrier leakage correction and compensation functions |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106292837A (en) * | 2016-07-26 | 2017-01-04 | 中国电子科技集团公司第四十研究所 | A kind of call method of AWG (Arbitrary Waveform Generator) amplitude calibration data |
| CN106292837B (en) * | 2016-07-26 | 2019-02-26 | 中国电子科技集团公司第四十一研究所 | A kind of call method of arbitrary waveform generator amplitude calibration data |
| CN110824212A (en) * | 2019-11-05 | 2020-02-21 | 山东浪潮人工智能研究院有限公司 | Multichannel arbitrary waveform generator correction method and system |
| CN110824212B (en) * | 2019-11-05 | 2022-03-01 | 浪潮集团有限公司 | Multichannel arbitrary waveform generator correction method and system |
| CN114280522A (en) * | 2021-12-24 | 2022-04-05 | 贵州航天计量测试技术研究所 | Pulse counting calibration device and method for pulse counter |
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Application publication date: 20150520 |