CN100438340C - Method for detecting AD converter - Google Patents
Method for detecting AD converter Download PDFInfo
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- CN100438340C CN100438340C CNB2006100333908A CN200610033390A CN100438340C CN 100438340 C CN100438340 C CN 100438340C CN B2006100333908 A CNB2006100333908 A CN B2006100333908A CN 200610033390 A CN200610033390 A CN 200610033390A CN 100438340 C CN100438340 C CN 100438340C
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Abstract
This invention discloses a test method for AD converters, which inputs a test signal to a mono-board or a system containing an AD converter then to operate on the output digital signal of the AD converter and sets a compared threshold of the operation result and compares the operation value and the compared threshold value to judge if the operation value is over the compared threshold, if so, a fixed DC exists in the AD converter and it is considered that it is broken, otherwise, it is normal, if the converter has digital down converter, then the digital control oscillator of which is set to be zero.
Description
Technical field
The present invention relates to the detection method of electronic device, particularly a kind of detection method of AD converter.
Background technology
The AD converter is a kind of devices of a large amount of uses on veneer, the AD converter also needs after encapsulation is dispatched from the factory through transportation, the dress of unpacking, reach the standard grade then, many links such as paster, veneer detection, veneer packing, veneer transportation, veneer installation, the operation that powers on, each link all has and has the possibility that causes AD to lose efficacy.The modal failure mode of AD converter is that output contains direct current (being that constant low level or high level appear in some bit), no-output, output overall height level are the egregious cases that output contains direct current, and this situation is easy to find by the test of the general utility functions in the veneer production process.It is a kind of more indiscoverable inefficacy that yet the direct current that constant level causes appears in AD converter output bit, functional test can find that the possibility of this inefficacy is very little, but this inefficacy can directly cause AD output to have fixed error, if it is do not add detection, self-evident to the hidden danger that whole veneer, system bring.Therefore be necessary in the production process of veneer or veneer running this direct current lost efficacy and detect, if just in the veneer production process, find the directly out of order AD chip of rejecting.
Summary of the invention
In order to check out the fixedly AD converter of direct current defective of existence, the invention provides a kind of method that can accurately detect the standing dc component of AD converter output digital signal existence, output can be contained in production test fixedly that the AD converter of direct current screens rejecting, improve reliability of products greatly.
For achieving the above object, the invention provides a kind of detection method of AD converter, said method comprising the steps of:
Steps A: to containing the veneer input detection signal of AD converter, described detection signal is to make an uproar at the end or make direct current or the AC signal of the digital signal of AD converter output for the full width of cloth;
Step B: the digital signal to the output of AD converter is carried out computing, and sets different comparison thresholds according to described detection signal;
Step C: described operation values is compared with comparison threshold, judge whether described operation values exceeds comparison threshold.
Preferably, described step B specifically comprises: the mean value of the digital signal of AD converter output being asked for voltage.
Preferably, described step B also can specifically comprise: the mean value of the digital signal of AD converter output being asked for power.
For the veneer that contains unipolarity input AD converter, the detection signal of input is when making an uproar at the end, described comparison threshold is made as the fiducial value in the veneer error range, when described mean value during greater than described comparison threshold, judges that then there is standing dc component in the AD converter.
For the veneer that contains unipolarity input AD converter, the detection signal of input is that the digital signal that the AD converter is exported is when expiring the direct current signal of the width of cloth, described comparison threshold is made as the full width of cloth output valve in the veneer error range, when described mean value during, judge that then there is standing dc component in the AD converter less than described comparison threshold.
For the veneer that contains bipolarity input AD converter, the detection signal of input is to make an uproar at the end or the digital signal that makes AD converter output during for the direct current signal of the full width of cloth, described comparison threshold is made as the positive and negative interval value in the veneer error range, when described mean value exceeds described comparison threshold scope, judge that then there is standing dc component in the AD converter.
For the veneer that contains bipolarity input AD converter, the detection signal of input is to make an uproar at the end, described comparison threshold is the fiducial value in the veneer error range, when described average power content during greater than described comparison threshold, judges that then there is standing dc component in the AD converter.
For the veneer that contains bipolarity input AD converter, the detection signal of input is to make the AC signal of the digital signal of AD converter output for the full width of cloth, described comparison threshold is made as the full width of cloth output valve in the veneer error range, when described average power content during, judge that then there is standing dc component in the AD converter less than described comparison threshold.
Preferably, if described AD converter has digital down converter, then the numerical control oscillator with described digital down converter is configured to zero.
The invention has the beneficial effects as follows:
Average or the technical scheme of average power content by above-mentioned digital signal to AD output on the veneer that contains the AD converter, can be that the fault that fixed level produces DC component detects to export some bit data owing to the AD converter, can accurately detect the direct current output defective of AD converter, thereby find to exist in the batch AD converter in the veneer production process chip of fault, and fault AD screened, improved reliability of products greatly.
Description of drawings
Fig. 1 is the block diagram of detection method of the present invention;
Fig. 2 is the flow chart of an embodiment of detection method of the present invention;
Fig. 3 is the flow chart of another embodiment of the present invention's detection method of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
This method is mainly used in the detection of failed part in the large-scale production that comprises AD converter veneer.
Referring to Fig. 1, the detection signal of input is by behind the AD converter, within a certain period of time, such as, import an AWGN (additive white Gaussian noise) signal, get time period of 100 milliseconds with 50,000,000 sample frequency, get one piece of data and carry out computing, described computing can be input in any one system to be carried out.In the present embodiment, the data segment of this sampling outputs on the CPU that contains AD converter veneer or system, tries to achieve mean value through after the computing, then the size of mean value is made comparisons whether contain the fixedly judgement of direct current with the comparison threshold that is provided with in advance.In embodiment of the present invention, the error range of veneer has been considered in the setting of threshold value, comprises the error that the level of making an uproar of the different ends produces.In the present embodiment, make an uproar and be meant background noise in the end, for thermal noise, ground wire noise, power supply noise etc. are accumulated in together veneer noise.
Wherein, described computing comprises all power methods of average electrical platen press peace.
Described average electrical platen press is promptly got the direct averaged of voltage of the digital signal of AD converter output
Obtain a mean value, can detect fault by the voltage direct current signal after average is just compared with the comparison threshold that sets in advance.
Described average power rule is to ask for the mean value of its power according to the digital signal of AD converter output.Suppose whole data are divided into the M section, the power of each segment data is
Pass through so
Obtain the average power of one piece of data, can detect fault by the power after average is just compared with the comparison threshold that sets in advance.
Being provided with of comparison threshold can be carried out according to the end level of making an uproar of AD converter place veneer or system, according to the level of making an uproar of the different ends, with full width of cloth input different comparison thresholds is set respectively at the end input of making an uproar, for example, making an uproar in the end ideally is zero, make an uproar and be output as 16 corresponding to AD in the end of veneer, the make an uproar comparison threshold in when input is set to the bigger value of a ratio 16 at the end so, and the comparison threshold when in like manner expiring width of cloth input is set to one and exports than full width of cloth numeral and to deduct 16 smaller values.
At the different input detection signal of AD converter place veneer or system, do following the analysis to setting comparison threshold:
A. if AD is the input of one pole type, a fixed value is set respectively get final product at make an uproar input and full width of cloth input of the end according to the end of the veneer level of making an uproar so, adopt the average electrical platen press to judge that direct current exports defective.
B. if AD is ambipolar input, a value that comprises positive and negative scope is set respectively get final product at make an uproar input and the input of the full width of cloth of the end according to the end of the veneer level of making an uproar so, adopt the average electrical platen press to judge that direct current exports defective; For the bipolarity AC signal, at make an uproar input and full power input of the end a fixing value is set respectively, adopt the average power method to judge that direct current exports defective.
If C. no matter low-pass signal input AD converter is the AD of one pole type input or the AD of ambipolar input, need import the direct current signal of the positive and negative full width of cloth respectively, adopt the average power method to judge direct current output defective.
If bandpass signal input AD converter D., can select tone signal or average is zero additive white Gaussian noise AWGN, at make an uproar input and full power input of the end a fixing value is set respectively, adopts the average power method to judge that direct current exports defective.
Referring to Fig. 2, the invention provides an embodiment who adopts the average electrical platen press.
For the veneer that contains one pole type input AD converter, detection method is: make an uproar in the input end, the digital signal of AD converter output is input on the CPU of veneer or system, and ask for its average voltage, at this moment Pan Jue threshold value is near the fixed value zero of the level set of making an uproar according to the end of veneer or system, for example, the input of making an uproar of the end of corresponding 20mv, the corresponding comparison threshold of setting is 1, if the average voltage that calculate this moment is 2, judge that then this AD converter has the output of high level direct current, defective.
Make the numeral output of AD produce the direct current signal of the full width of cloth to this veneer input again, digital signal with the output of AD converter is input on the CPU of veneer or system equally respectively, and ask for its average voltage, at this moment Pan Jue comparison threshold is near the fixed value full amplitude of the level set of making an uproar according to the end of veneer or system.Be output as example with 8 AD converters, if the full width of cloth scale value of input is 5V, its end level of making an uproar is 20mv, and the corresponding comparison threshold of setting should be FE, and the average voltage that calculate this moment is FC, judges that then this AD converter has the output of low level direct current, and is defective.
For the veneer that contains ambipolar input AD converter, detection method is: make an uproar in the end of input earlier, its step is identical with the detection method of the above-mentioned veneer that contains one pole type input AD converter, repeated description no longer, difference is, this comparison threshold is near the positive negative value interval zero of the level set of making an uproar according to the end of veneer or system, for example, the input of making an uproar of the end of corresponding 20mv, the corresponding comparison threshold of setting is ± 1, if the average voltage that calculate this moment is 2, judge that then this AD converter has the output of high level direct current, defective.
Referring to Fig. 3, the invention provides an embodiment who adopts the average power method.
For the veneer that contains ambipolar input AD converter, for AC signal, the detection of full width of cloth signal and judgement can be adopted the average power method.Detection method is: make an uproar in the input end, the digital signal of AD converter output is input on the CPU of veneer or system, and ask for the mean value of its power, at this moment Pan Jue comparison threshold is near the fixed value zero of the level set of making an uproar according to the end of veneer or system, make an uproar comparison threshold that input sets of for example corresponding end is-90dbm, if this moment, the average power content that calculates was greater than-90dbm, judge that then this AD converter has the output of high level direct current, defective.
Make the numeral output of AD produce the AC signal of the full width of cloth to this veneer input again, take to ask for the mean value of its power with the same method of making an uproar at the bottom of the above-mentioned input, its judging threshold is the fixed value near full width of cloth power, such as, full scale is ± 2.2V, the output full power is the ambipolar AC signal of 5dbm, comparison threshold should set a numerical value more smaller than 5dbm, 4dbm for example, if the average power content that calculate this moment is 5.5dbm, greater than 4dbm, judge that then this AD converter has the output of high level direct current, defective.
Referring to Fig. 2, to having digital down converter DDC after the described AD converter veneer, and the AD converter be input as a midband messenger, can only obtain through the value after AD converter and the digital down converter DDC if can not directly obtain the output numerical value of AD converter, so the digital controlled oscillator (NCO) of DDC is got after corresponding frequencies makes the intermediate-freuqncy signal of AD converter input directly change to baseband signal through DDC, utilized the average power method to carry out whole AD converter+digital down converter DDC output again and whether contain the fixedly judgement of direct current.
For low-pass signal input AD converter, the method according to unipolarity input AD or twin-stage input AD detects the direct current fault respectively.
For bandpass signal input AD converter, according to the method detection direct current fault of ambipolar input AD.
After getting zero frequency for the The data numerical control oscillator that has digital down converter DDC after the AD converter veneer, adopt said method to detect.
In the application of reality, for one pole type input AD converter, make an uproar and expire width of cloth direct current and judge respectively whether AD output bit exists the direct current fault of fixing high level type and the fixing direct current fault of low level type, and employing average electrical platen press is simple in the input end; For ambipolar input AD converter, make an uproar and judge that AD exports the direct current fault of the fixedly high level type of bit in the input end, adopt the average electrical platen press comparatively simple, the input average is that zero AWGN (additive white Gaussian noise) full power signal is judged the fixedly direct current fault of low level type, adopts the average power method comparatively suitable.
Adopt detection method of the present invention, utilize the original CPU of veneer, only need to increase the detection that a little code can be realized fault AD converter, hardly with increasing any hardware cost, therefore this method is a kind of low cost solution, the quality situation of very convenient detection AD converter.
More than just preferred implementation of the present invention is described, those skilled in the art is in the scheme scope of the technology of the present invention, and common variation and the replacement carried out all should be included in protection scope of the present invention.
Claims (9)
1, a kind of detection method of AD converter is characterized in that, said method comprising the steps of:
Steps A: to containing the veneer input detection signal of AD converter, described detection signal is to make an uproar at the end or make direct current or the AC signal of the digital signal of AD converter output for the full width of cloth;
Step B: the digital signal to the output of AD converter is carried out computing, and sets the comparison threshold of different operation results according to described detection signal;
Step C: described operation values is compared with comparison threshold, judge whether described operation values exceeds comparison threshold.
2, the detection method of AD converter according to claim 1 is characterized in that, described step B specifically comprises: the mean value of the digital signal of AD converter output being asked for voltage.
3, the detection method of AD converter according to claim 1 is characterized in that, described step B specifically comprises: the mean value of the digital signal of AD converter output being asked for power.
4, the detection method of AD converter according to claim 3, it is characterized in that, for the veneer that contains unipolarity input AD converter, the detection signal of input is when making an uproar at the end, described comparison threshold is made as the fiducial value in the veneer error range, when described mean value during, judge that then there is standing dc component in the AD converter greater than described comparison threshold.
5, the detection method of AD converter according to claim 3, it is characterized in that, for the veneer that contains unipolarity input AD converter, the detection signal of input is that the digital signal that the AD converter is exported is when expiring the direct current signal of the width of cloth, described comparison threshold is made as the full width of cloth output valve in the veneer error range, when described mean value during, judge that then there is standing dc component in the AD converter less than described comparison threshold.
6, the detection method of AD converter according to claim 3, it is characterized in that, for the veneer that contains bipolarity input AD converter, the detection signal of input is to make an uproar at the end or the digital signal that makes AD converter output during for the direct current signal of the full width of cloth, described comparison threshold is made as the positive and negative interval value in the veneer error range, when described mean value exceeds described comparison threshold scope, judge that then there is standing dc component in the AD converter.
7, the detection method of AD converter according to claim 4, it is characterized in that, for the veneer that contains bipolarity input AD converter, the detection signal of input is to make an uproar at the end, described comparison threshold is the fiducial value in the veneer error range, when described average power content during, judge that then there is standing dc component in the AD converter greater than described comparison threshold.
8, the detection method of AD converter according to claim 4, it is characterized in that, for the veneer that contains bipolarity input AD converter, the detection signal of input is to make the AC signal of the digital signal of AD converter output for the full width of cloth, described comparison threshold is made as the full width of cloth output valve in the veneer error range, when described average power content during, judge that then there is standing dc component in the AD converter less than described comparison threshold.
9, the detection method of AD converter according to claim 1 is characterized in that, if described AD converter has digital down converter, then the numerical control oscillator with described digital down converter is configured to zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100333908A CN100438340C (en) | 2006-01-24 | 2006-01-24 | Method for detecting AD converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100333908A CN100438340C (en) | 2006-01-24 | 2006-01-24 | Method for detecting AD converter |
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| CN1901378A CN1901378A (en) | 2007-01-24 |
| CN100438340C true CN100438340C (en) | 2008-11-26 |
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| CNB2006100333908A Expired - Fee Related CN100438340C (en) | 2006-01-24 | 2006-01-24 | Method for detecting AD converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102394649B (en) * | 2011-11-08 | 2015-05-20 | 上海捷策创电子科技有限公司 | High bandwidth high speed analog-to-digital converter batch production testing device based on crystal oscillator and method thereof |
| CN104215863A (en) * | 2014-09-30 | 2014-12-17 | 无锡康柏斯机械科技有限公司 | Testing method of AD port of 1U controller of grinding machine |
| CN106371418B (en) * | 2015-07-20 | 2019-02-01 | 西门子数控（南京）有限公司 | The detection device and method of motion control signal conversion equipment |
| CN106209498A (en) * | 2016-06-28 | 2016-12-07 | 成都启源电子信息技术有限公司 | Optical-electrical converter problem diagnosis system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0856160A (en) * | 1994-08-10 | 1996-02-27 | Nissin Electric Co Ltd | Abnormality detector for a/d converter |
| CN1208901C (en) * | 2001-04-04 | 2005-06-29 | 华邦电子股份有限公司 | Test method and circuit for successive approximation A/D conversion integrated circuit |
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- 2006-01-24 CN CNB2006100333908A patent/CN100438340C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0856160A (en) * | 1994-08-10 | 1996-02-27 | Nissin Electric Co Ltd | Abnormality detector for a/d converter |
| CN1208901C (en) * | 2001-04-04 | 2005-06-29 | 华邦电子股份有限公司 | Test method and circuit for successive approximation A/D conversion integrated circuit |
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| CN1901378A (en) | 2007-01-24 |
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