CN101726644A - Digital storage oscilloscope with functions of waveform fast location and zooming - Google Patents
Digital storage oscilloscope with functions of waveform fast location and zooming Download PDFInfo
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Abstract
The invention discloses a digital storage oscilloscope with functions of waveform fast location and zooming, comprising a characteristic value detection module and a characteristic value storage FIFO. All sampling data is in buffer memory in a detail waveform memory with large capacity, and the characteristic value detection module simultaneously screens the sampling data so as to screen out characteristic value data in continuous N sampling data. When a waveform is observed, characteristic value data is firstly read and displayed. Because the characteristic value data is 1/N of all the sampling data, the response speed is fast, and the waveform capture rate is high. When a section of characteristic value data is abnormal, collection data corresponding to the detail waveform memory with large capacity is read in so as to be treated and displayed through a corresponding storage relationship of the sampling data of the detail waveform memory and the characteristic value data, and the corresponding waveform of the section of characteristic value data is observed in detail, therefore, fast location and zooming of the waveform are finished, and the problems of slow response speed, low waveform capture rate and difficult discovery of harmful signals including burrs under depth storage are solved.
Description
Technical field
The present invention relates to digital storage oscilloscope, specifically, relate to a kind of digital storage oscilloscope under degree of depth storage with the quick location of waveform and zoom function
Background technology
Digital storage oscilloscope is since last century, the seventies was born, and it is used more and more widely, has now become one of instrument of Test Engineer's indispensability.
Sampling rate, storage depth (memory depth) and wave capture rate are three big main performance index of digital storage oscilloscope (DSO).Sampling rate is meant that per second extracts and form the number of samples of discrete signal from continuous signal; Storage depth is illustrated in the ability of continuous acquisition under the highest real-time sampling rate and store sample point, uses sampling number (pts) expression usually; The wave capture rate is represented the waveform width of cloth number that oscillograph can catch and show in the unit interval, usually with waveform width of cloth number/expression second (wfms/s).Sampling rate directly and storage depth substantial connection is arranged because digital storage oscilloscope must come diode-capacitor storage about the instruction of pull-in time length according to the user.If the user is the time basic control setting of digital storage oscilloscope 100us/div, if there are 10 * 8 lattice the waveform viewing area, this just means that whole screen represents the time of 1ms, the high sampling rate that can adopt when digital storage oscilloscope must be determined to catch the signal that reaches 1ms under the prerequisite that does not exhaust its memory resource so.If the maximum of digital storage oscilloscope sampling speed is 5GSPS, and storage space is 10k, so Shi Ji sampling rate can not be higher than 10MSPS.This sampling rate is significantly less than high sampling rate, and user's measurement will be subjected to owing the adverse effect of sampling (undersampling) easily---and aliasing, signal detail are lost with the measurement result mistake etc.For shallow storage oscilloscope, these all are serious problems.
Digital storage oscilloscope producer is all obtaining breakthrough development aspect the raising storage depth both at home and abroad.The TDS6000 series digit storage oscilloscope of U.S. Imtech (Tektronix), when binary channels was used, the storage depth of every passage was 64Mpts, when four passages used simultaneously, the storage depth of every passage was 32Mpts; On every passage of 4000 series digit fluorescence oscillographs (DPO) standard configuration the storage depth of 10Mpts, can catch long signal window, keep meticulous timing resolution simultaneously.The storage depth of 54642A DSO of U.S. Agilent company (Agilent) and 54642D MSO series is 8Mpts; The oscillographic storage depth standard of DSO/DSA90000A series of Agilent company is 10Mpts, and is maximum up to 1Gpts.The storage depth of the LT342L series of U.S. Li Ke company (LeCroy) is 1Mpts.Domestic DS1000E series with Pu Yuan is example, and maximum storage degree of depth single channel has reached 1Mpts, and binary channels is 512Kpts.As seen, the raising of storage depth is one of developing direction of following digital storage oscilloscope.
With mass storage, for example memory applications such as DDR, DDR2, DDR3, LPDDR can improve the storage depth of digital storage oscilloscope greatly in digital storage oscilloscope, and the sampling rate of AD can require corresponding raising simultaneously.The storage depth of DSO is high more, and so how finer waveform just can go on record.
Under degree of depth storaging working mode, the collection of data and storage are finished by triggering control.With the trigger pip is benchmark, a large amount of Wave datas before and after whole storage space is noted the trigger pip arrival.Big storage depth has guaranteed the Wave data acquisition time under high sampling rate, for the analysis of waveform provides sufficient data message, can guarantee the acquisition and recording to detail signal.But, comparing with analog oscilloscope, just there is the response defect of bad in DSO itself.Along with the increase of storage depth, because the processing time problem of digital waveform record will certainly be brought the low-response problem.The each screen waveform of the great digital storage oscilloscope of some storage depth refreshes and reaches 8 to 10 seconds.So big memory application in DSO, when improving storage depth, is bound to bring the slow problem of response speed.Such as, the sampling rate of 1GSPS and the storage depth of 128Mpts, the time of depositing sampling point data is 1ns, being filled with so needs 128ms, microprocessor is read sampling point data needs 100ns, the data that run through the storage the inside need 128Mpts * 100ns=12.8s, and response speed will inevitably be very slow.Storage depth is high more, and the continuous capture time of waveform is long more, and the time of system handles data is long more, and response speed is slow more, and Dead Time is big more, and the wave capture rate is low more, and unwanted signals such as burr are difficult more to be found.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of fast digital storage oscilloscope of location and zoom function of waveform that has is provided, solves again when realizing degree of depth storage that response speed is slow, the wave capture rate is low and the ND problem of unwanted signals such as burr.
For achieving the above object, the present invention has the digital storage oscilloscope of quick location of waveform and zoom function, comprise signal condition passage, analog to digital converter, detailed wave memorizer control module, jumbo detailed wave memorizer, microprocessor and display, it is characterized in that, also comprise:
One characteristic value detection module is connected with analog to digital converter, is used to detect the sampled data stream of analog to digital converter output, filters out characteristic value data from a continuous N sampled data;
One eigenwert storage FIFO is connected with characteristic value detection module, is used to store the characteristic value data that characteristic value detection module filters out;
Simulating signal after the conditioning of signal condition passage output is sent in the analog to digital converter and is sampled, and what obtain flows into detailed wave memorizer control module and characteristic value detection module simultaneously for the sampled data stream of discrete signal; Whole sampled datas of wave memorizer control module control sampled data stream deposit in the jumbo detailed wave memorizer and carry out depth buffer in detail, characteristic value detection module detects sampled data stream, filters out characteristic value data and deposit among the eigenwert storage FIFO from a continuous N sampled data; The characteristic value data corresponding stored of the sampled data of jumbo detailed wave memorizer and eigenwert storage FIFO;
When observing waveform, the characteristic value data that microprocessor at first reads among the eigenwert storage FIFO is handled, and send display to show, when certain section characteristic value data needs to observe in detail, the corresponding stored relation of the characteristic value data of sampled data by detailed wave memorizer and eigenwert storage FIFO, find this section characteristic value data corresponding address in the jumbo detailed wave memorizer fast, the image data that microprocessor reads in jumbo detailed wave memorizer correspondence is handled, and deliver in the display and show, observe the waveform of this section characteristic value data correspondence in detail, this just realizes the quick location and the convergent-divergent of waveform.
Goal of the invention of the present invention is achieved in that
At first, with the whole sampled data of jumbo detailed wave memorizer buffer memory, characteristic value detection module is screened sampled data simultaneously, from a continuous N sampled data, filters out characteristic value data, sends among the eigenwert storage FIFO and stores.The characteristic value data that detects can comprise maximal value, minimum value, flex point, mean value, eigenwert number etc.Then, when observing waveform, the characteristic value data that reads earlier among the eigenwert storage FIFO is handled, and send display to show, because the characteristic value data among the eigenwert storage FIFO is the 1/N of whole image data, therefore, during demonstration, response speed is very fast, wave capture rate height.When finding that certain section characteristic value data has unusually, such as when the eigenwert that detects is maximal value, unwanted signals such as burr can make characteristic value data become big suddenly or reduce, at this moment, the corresponding stored relation of the characteristic value data of sampled data by detailed wave memorizer and eigenwert storage FIFO, find this section characteristic value data corresponding address in the jumbo detailed wave memorizer fast, the image data that microprocessor reads in jumbo detailed wave memorizer correspondence is handled, and deliver to display and show, observe the waveform of this section characteristic value data correspondence in detail, such as one section jagged waveform, thereby finish the quick location and the convergent-divergent of waveform, response speed is slow down to have solved degree of depth storage, the ND problems of unwanted signals such as the low and burr of wave capture rate.
Description of drawings
Fig. 1 is a kind of embodiment schematic diagram of digital storage oscilloscope that the present invention has quick location of waveform and zoom function;
Fig. 2 is the address corresponding relation figure when data bit width equates among the present invention;
Fig. 3 is the address correspondence when data bit width is unequal among the present invention;
Fig. 4 is eigenwert T
iAnd T
I+mBetween the in detail quick location and the convergent-divergent of Wave data;
Fig. 5 is the location and the zooming effect figure of waveform.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described, so that understand the present invention better.What need point out especially is that in the following description, when perhaps the detailed description that adopts known function and design can desalinate main contents of the present invention, these were described in here and will be left in the basket.
Embodiment
Fig. 1 is a kind of embodiment schematic diagram of digital storage oscilloscope that the present invention has quick location of waveform and zoom function.
As shown in Figure 1, in the present embodiment, have waveform fast the digital storage oscilloscope of location and zoom function comprise signal condition passage 1, analog to digital converter 2, wave memorizer control module 3, jumbo detailed wave memorizer 4, microprocessor 5 and display 6 in detail.In order to realize location and zoom function fast, on the basis of existing dark storage digital storage oscilloscope, increased a characteristic value detection module 7 and eigenwert storage FIFO 8, characteristic value detection module 7 is connected with analog to digital converter 2, detect the sampled data stream of analog to digital converter 2 outputs, from a continuous N sampled data, filter out characteristic value data, and deposit among the eigenwert storage FIFO8.
The simulating signal of 1 pair of input of signal condition passage is nursed one's health, the simulating signal of output analog to digital converter 2 input ranges, and simulating signal is sampled in analog to digital converter 2, obtains the sampled data stream into discrete signal.Sampled data stream is divided into two-way, and one the road flows into detailed wave memorizer control module 3, and whole sampled datas of control sampled data stream deposit in the jumbo detailed wave memorizer 4 carries out depth buffer; One the road flows into characteristic value detection module detects, and filters out characteristic value data and deposit among the eigenwert storage FIFO from a continuous N sampled data.
The characteristic value data corresponding stored of the sampled data of jumbo detailed wave memorizer and eigenwert storage FIFO, in the present embodiment, this corresponding relation is placed in the address mapping module 9.Characteristic value data in eigenwert storage FIFO 8 in storage addresses and the jumbo detailed wave memorizer 4 the sampled data storage addresses certain corresponding relation is arranged.
As shown in Figure 2, under the condition that data bit width equates, if the capacity that 4 storages of jumbo detailed wave memorizer are used is D, the capacity that eigenwert is stored FIFO 8 is d, then characteristic value detection module 7 according to
Ratio screening characteristic value data (promptly
), the storage space correspondence of the i～i+k in the detailed wave memorizer among the eigenwert storage FIFO 8
The section storage space.
As shown in Figure 3, in the unequal condition of data bit width following time, if the capacity that jumbo detailed wave memorizer 4 storages are used is M as D, data bit width, the capacity of eigenwert storage FIFO 8 is that d, data bit width are m, and the memory address number of eigenwert storage FIFO 8 is so
The memory address number of jumbo detailed wave memorizer 4 is
Then eigenwert storage FIFO 8 according to
Ratio screening characteristic value data promptly
The storage space correspondence of the i～i+k in the jumbo detailed wave memorizer 4 the among the eigenwert storage FIFO 8
The section storage space.
When needing to observe the waveform of certain section characteristic value data correspondence in detail, corresponding address is found in the address of microprocessor 5 this section of output characteristic value datas in address mapping module 9, it is image data address corresponding in the jumbo detailed wave memorizer 4, then according to this image data address, microprocessor 5 reads image data corresponding in the jumbo detailed wave memorizer 4 in the microprocessor 5 by detailed wave memorizer control module 3 and handles, and delivers in the display 6 and show.
In the present embodiment, on the basis of existing dark storage digital storage oscilloscope, also increased data stream handover module 10, under the control of microprocessor 5, the data stream of handoff features value storage FIFO 8 or jumbo detailed wave memorizer 4 enters microprocessor 5, microprocessor 5 is realized control and data processing function, and the data after microprocessor 5 is handled are given display and shown.
When observing waveform, at first select the characteristic value data among the eigenwert storage FIFO 8 to observe, be that data stream handover module 10 switches to eigenwert storage FIFO 8, the characteristic value data of eigenwert storage FIFO8 flows in the microprocessor 5 to be handled, and delivers in the display 6 and show; When certain section characteristic value data was needed to observe in detail, corresponding address was found, the image data address of correspondence in the promptly jumbo detailed wave memorizer 4 in the address of microprocessor 5 this section of output characteristic value datas in address mapping module 9; Under the control of microprocessor 5, data stream handover module 10 switches to jumbo detailed wave memorizer 4 data stream, the image data stream of jumbo detailed wave memorizer 4, enter in the microprocessor 5 and handle, and deliver in the display 6 and show that this just realizes the quick location and the convergent-divergent of waveform.
As shown in Figure 1, in this enforcement, wave memorizer control module 3, characteristic value detection module 7, eigenwert are stored FIFO 8 in detail, and address mapping module 9 and data stream handover module 10 usefulness a slice field programmable gate arrays design.
In specific implementation process, digital to analog converter generally adopts parallel time alternating sampling digital to analog converter, to improve sampling rate, the number of the AD that adopts is a, need carry out H to each AD sampled data so: 1 eigenwert detects after the screening, again a the characteristic value data that filters out carried out the secondary characteristics value and detect characteristic value data of screening, at last Shai Xuan ratio be (a * H): 1 (N=a * H), the sampled data in the detailed wave memorizer 4 of i characteristic value data correspondence can be represented by formula (1) among the eigenwert storage FIFO8 so:
A
Ni(n=1,2 ..., a) sampled data stream that H data of n AD sampling of storage constitute in the detailed wave memorizer 4 of i characteristic value data correspondence among the representation feature value storage FIFO 8.When storing W characteristic value data among the eigenwert storage FIFO 8, jumbo detailed wave memorizer 4 storages are full, and the data of storage and data volume can be used formula (2) expression in the jumbo detailed wave memorizer 4:
The acquired data storage of the storage space of then jumbo detailed wave memorizer 4 can be represented by formula (3):
The characteristic value data storage of eigenwert storage FIFO 8 is represented by formula (4):
(T
1，T
2，…，T
i，…，T
W) (4)
The storage of jumbo detailed wave memorizer 4 is stored by the row of formula (3) exactly, first position start address counting storage from first row, delegation's storage is full, then stores next line, and storage data corresponding address count value is represented the memory location of data.The element number of formula (3) is the capacity that jumbo detailed wave memorizer 4 storages are used, the characteristic value data of storing among the representation feature value storage FIFO 8 in the formula (4) and the memory location of characteristic value data.(A
I1 T, A
I2 T..., A
Ia T) represented i eigenwert T of eigenwert storage FIFO
iStorage data and memory location thereof in the corresponding jumbo detailed wave memorizer 4, the storage data of correspondence in the jumbo detailed wave memorizer 4 of element representation in the formula, positions of elements is represented the memory location of corresponding data in the jumbo detailed wave memorizer 4, the memory location of corresponding data is that N * (i-1)+1 is to Ni, wherein 1≤i≤W.When needs are observed eigenwert T
iAnd T
I+mBetween detailed Wave data the time, as shown in Figure 4, when adopting quick location with convergent-divergent, the initial memory location N of the waveform that microprocessor 5 is observed needs * (i-1)+1 issue address counter begins counting as the start address of address counter, read fast and give the display demonstration after m * N data that need are handled, so just do not need to read irrelevant data, saved reading and the processing time of data greatly; If do not adopt location and convergent-divergent fast, microprocessor 5 reading of data will begin to read the total data the detailed wave memorizer from the start address of internal memory so, handle then and show, clearly, at this time the data read amount is far longer than the data read amount that adopts when the location is with zoom technology fast, and the time that needs is far longer than adopts the needed time of data read when the location is with zoom technology fast.Characteristic value data T
iAnd T
I+mBetween detailed Wave data and in detail the memory location of Wave data in jumbo detailed wave memorizer 4 can represent by formula (5).
In the present embodiment, characteristic value detection module 7 is to be disposed by field programmable gate array.Can screen and store into eigenwert storage FIFO8 the inside to characteristic value data by field programmable gate array.Eigenwert disposes two kinds of methods: a kind of method is directly with hardware language field programmable gate array to be carried out eigenwert screening configuration, and software does not participate in the selection of eigenwert; Another kind method is that all eigenwerts are carried out eigenwert screening configuration by hardware language to field programmable gate array, realizes the selection that characteristic value data detects according to user's needs by software control then.
In the present embodiment, the storage addressing of the detailed Wave data of jumbo detailed wave memorizer 4 is to be realized by field programmable gate array, a storage of programmable gate array internal configurations data addressing counter is realized the correct storage of detailed waveform storage data at the scene.It is to be realized by the microprocessor control counter that the detailed Wave data of jumbo detailed wave memorizer 4 reads addressing, when needs show the detailed Wave data of certain part of detailed wave memorizer, being sent by microprocessor 5 needs the first address of reading of data signal and reading of data number, from jumbo detailed wave memorizer 4, read the waveform detailed data of wanting fast, again these waveform detailed datas are sent to display 5 and show.
Adopt waveform location and zoom technology fast, we can find unwanted signals such as burr easily, as shown in Figure 5.Shown in Fig. 5 figure below, the waveform of demonstration is the Wave data among the eigenwert storage FIFO, and there is burr in waveform, needs to observe the detailed waveform at burr place.Switch data stream, location and waveform amplification are fast observed the detailed waveform at burr place, and the last figure of Fig. 5 shows is the interior detailed waveform of graticule scope around the burr in figure below.
Although above the illustrative embodiment of the present invention is described; so that the technician of present technique neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various variations appended claim limit and the spirit and scope of the present invention determined in, these variations are conspicuous, all utilize innovation and creation that the present invention conceives all at the row of protection.
Claims (4)
1. one kind has the fast digital storage oscilloscope of location and zoom function of waveform, comprise signal condition passage, analog to digital converter, detailed wave memorizer control module, jumbo detailed wave memorizer, microprocessor and display, it is characterized in that, also comprise:
One characteristic value detection module is connected with analog to digital converter, is used to detect the sampled data stream of analog to digital converter output, filters out characteristic value data from a continuous N sampled data;
One eigenwert storage FIFO is connected with characteristic value detection module, is used to store the characteristic value data that characteristic value detection module filters out;
Simulating signal after the conditioning of signal condition passage output is sent in the analog to digital converter and is sampled, and what obtain flows into detailed wave memorizer control module and characteristic value detection module simultaneously for the sampled data stream of discrete signal; Whole sampled datas of wave memorizer control module control sampled data stream deposit in the jumbo detailed wave memorizer and carry out depth buffer in detail, characteristic value detection module detects sampled data stream, filters out characteristic value data and deposit among the eigenwert storage FIFO from a continuous N sampled data; The characteristic value data corresponding stored of the sampled data of jumbo detailed wave memorizer and eigenwert storage FIFO;
When observing waveform, the characteristic value data that microprocessor at first reads among the eigenwert storage FIFO is handled, and send display to show, when certain section characteristic value data needs to observe in detail, the corresponding stored relation of the characteristic value data of sampled data by detailed wave memorizer and eigenwert storage FIFO, find this section characteristic value data corresponding address in the jumbo detailed wave memorizer fast, the image data that microprocessor reads in jumbo detailed wave memorizer correspondence is handled, and deliver in the display and show, observe the waveform of this section characteristic value data correspondence in detail, this just realizes the quick location and the convergent-divergent of waveform.
2. the digital storage oscilloscope with the quick location of waveform and zoom function according to claim 1, it is characterized in that, also comprise an address mapping module, be used to store the sampled data of jumbo detailed wave memorizer and the characteristic value data corresponding stored relation of eigenwert storage FIFO;
When needing to observe the waveform of certain section characteristic value data correspondence in detail, microprocessor is exported the address of this section characteristic value data and find corresponding address in address mapping module, then according to this image data address, microprocessor reads image data corresponding in the jumbo detailed wave memorizer in the microprocessor by detailed wave memorizer control module and handles, and delivers in the display and show.
3. the digital storage oscilloscope with the quick location of waveform and zoom function according to claim 1, it is characterized in that, also comprise a data stream handover module, under the control of microprocessor, the data stream of handoff features value storage FIFO or jumbo detailed wave memorizer enters microprocessor, and the data after the microprocessor processes are given display and shown.
When observing waveform, at first select the characteristic value data among the eigenwert storage FIFO to observe, be that the data stream handover module switches to eigenwert storage FIFO, the characteristic value data of eigenwert storage FIFO flows in the microprocessor to be handled, and delivers in the display and show; When certain section characteristic value data was needed to observe in detail, microprocessor was exported the address of this section characteristic value data and find corresponding address in address mapping module; Under the control of microprocessor, the data stream handover module switches to jumbo detailed wave memorizer data stream, and the image data of jumbo detailed wave memorizer stream enters in the microprocessor and handles, and delivers in the display and show.
4. the digital storage oscilloscope with the quick location of waveform and zoom function according to claim 1, it is characterized in that, described digital to analog converter is the individual parallel time alternating sampling digital to analog converter of a for the AD number, and jumbo detailed wave memorizer is stored in the following manner:
Wherein, A
In TBe A
NiTransposed matrix, A
NiI characteristic value data T among the representation feature value storage FIFO
iThe sampled data stream that H data of n the AD sampling of storing in the corresponding detailed wave memorizer constitute, n=1,2 ..., a, i=1,2 ..., W, W are the number that eigenwert is stored the characteristic value data of storing among the FIFO;
The characteristic value data of eigenwert storage FIFO is stored as:
(T
1，T
2，…，T
i，…，T
W)
Wherein, T
iCharacteristic value data when being the detection of i sub-eigenvalue.
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