CN108111170A - A kind of Larger Dynamic range signal harvester - Google Patents
A kind of Larger Dynamic range signal harvester Download PDFInfo
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- CN108111170A CN108111170A CN201711274805.5A CN201711274805A CN108111170A CN 108111170 A CN108111170 A CN 108111170A CN 201711274805 A CN201711274805 A CN 201711274805A CN 108111170 A CN108111170 A CN 108111170A
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- signal
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- dynamic range
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
Abstract
The invention discloses a kind of Larger Dynamic range signal harvesters, in the case where high-speed ADC dynamic range is limited, the amplification of different gains is carried out to same signal by multiple passages, and sampling is synchronized to signal by multiple ADC, then in multi-channel sampling data, undistorted and maximum amplification factor data frame is chosen by frame to carry out reducing with split (reconstruction) to improve the dynamic range of signal acquisition and sampling real-time, reach the acquisition to high speed Larger Dynamic signal, so, while systematic sampling rate and dynamic range is taken into account, greatly reduce acquisition system scale and ADC quantity.
Description
Technical field
The invention belongs to Signal Collection Technology fields, more specifically, are related to a kind of Larger Dynamic range signal acquisition dress
It puts.
Background technology
In recent years, in extensive technical field, hyundai electronics signal shows complication, multifarious feature, especially
It is that the frequency range of signal is constantly widened, instantaneity, the complexity of signal are continuously increased, and non-stationary property increases rapidly.In section
It learns in research and Important Project and often tests the electronic signal that all multi-dynamic-ranges are big, bandwidth is high, wave character enriches, for example,
In order to assess the effect of large-scale detonation test, it is necessary to which the transient state that the duration is extremely short in predetermined spherical space, very bandwidth is wide is believed
Number carry out accurate measurement analysis；For another example, in the electronic systems such as radar, accidental interference is often failure and the profound level of failure
Reason.
Real-time Larger Dynamic scope capture is to obtain the premise of these signal important informations, improve acquisition system sample rate and
Dynamic range is the key that realize that broadband sophisticated signal captures in real time.However, being limited by integrated circuit fabrication process, signal is adopted
The resolution ratio and sample rate of collection core devices analog-digital converter (ADC) are a pair of conflicting index always, and ADC is difficult to simultaneously
Reach higher sample rate and larger dynamic range, this is one that broadband time-domain analytical technology is applied in electronic measuring instrument
A main bottleneck.
Under the background being limited in commercial chip, the effective way of acquisition system sample rate and dynamic range (resolution ratio) is improved
It is to start with from system level design.In the method for existing promotion acquisition system resolution ratio or dynamic range, comparison method is classified
(∑-△), the ladder addition method, over-sampling take the methods of average method, scrambling sample mean method, frequency spectrum perception filter method that can improve
The effective resolution of system, but these methods sacrifice the sample rate of acquisition system.Although more ADC classifications amplification parallel samplings
Method, multi-ADC parallel sampling summation etc. have taken into account sample rate and resolution ratio, but the circuit scale of acquisition system and use simultaneously
The quantity of ADC can be in exponential increase.
The content of the invention
It is an object of the invention to be directed to existing ADC not taking into account sample rate and resolution ratio and the deficiency of parallel acquisition,
It is innovated from system-level, proposes a kind of Larger Dynamic range signal harvester, taking into account systematic sampling rate and dynamic range
Meanwhile greatly reduce acquisition system scale and ADC quantity.
For achieving the above object, Larger Dynamic range signal harvester of the present invention, which is characterized in that including：
One power-devided circuit, for input signal to be collected to be divided into identical multiple signals；
Multi pass acquisition passage, per road acquisition channel by including signal conditioning circuit, amplitude limiter circuit and ADC, power-devided circuit
The multiple signals of output are separately input to multi pass acquisition passage, are nursed one's health by signal conditioning circuit, amplitude limiter circuit amplitude limit, and ADC is same
Multi-channel sampling data are obtained after step sampling；Wherein, the amplification factor α of signal conditioning circuit1<α2<,...,<αn, n is acquisition channel
Way；Amplitude limiter circuit causes the signal limiting after signal conditioning circuit conditioning in ADC input ranges；
Data reconstruction module, multi-channel sampling data are stored into respective data buffer storage, judge each road gathered data by frame,
Undistorted and respective channel amplification factor maximum sampled data all the way is chosen to be reduced i.e. divided by corresponding amplification factor, it will
Each frame sampling data chosen carry out split, and (reconstruction) obtains the complete, collection result of high dynamic range.
The object of the present invention is achieved like this.
Larger Dynamic range signal harvester of the present invention, in the case where high-speed ADC dynamic range is limited, by multiple logical
Road carries out same signal the amplification of different gains, and sampling is synchronized to signal by multiple ADC, then in multi-channel sampling number
In, choose undistorted and maximum amplification factor data frame by frame and carry out reducing with split (reconstruction) to improve signal acquisition
Dynamic range and sampling real-time, reach the acquisition to high speed Larger Dynamic signal, in this way, taking into account systematic sampling rate and dynamic
While scope, greatly reduce acquisition system scale and ADC quantity.
Description of the drawings
Fig. 1 is a kind of specific embodiment functional block diagram of Larger Dynamic range signal harvester of the present invention；
Fig. 2 is the signal sampling principle schematic of Larger Dynamic range signal harvester of the present invention；
Fig. 3 is a kind of work flow diagram of Larger Dynamic range signal harvester of the present invention；
Fig. 4 is the existing ADC usage quantity schematic diagrames by amplitude etc. point sampling；
Fig. 5 is the ADC usage quantity schematic diagrames of Larger Dynamic range signal harvester of the present invention.
Specific embodiment
The specific embodiment of the present invention is described below in conjunction with the accompanying drawings, so as to those skilled in the art preferably
Understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed description of design perhaps
When can desalinate the main contents of the present invention, these descriptions will be ignored herein.
Fig. 1 is a kind of specific embodiment functional block diagram of Larger Dynamic range signal harvester of the present invention.
In the present embodiment, as shown in the figure, Larger Dynamic range signal harvester of the present invention include a power-devided circuit 1,
Three road acquisition channels 2 and data reconstruction module 3.Wherein, acquisition channel 2 includes signal conditioning circuit 201, amplitude limit electricity again
Road 202 and ADC 203.
Input signal to be collected is divided into three identical road signals by power-devided circuit 1, is separately input to the acquisition of three tunnel roads
Passage 2, the signal conditioning circuit 201 by three tunnel different gains is nursed one's health, 202 amplitude limit of amplitude limiter circuit, after 203 synchronized samplings of ADC
Three tunnel sampled datas are obtained, wherein, the amplification factor α of signal conditioning circuit 2011<α2<α3, amplitude limiter circuit 202 is so that signal tune
The signal limiting after circuit 201 is nursed one's health is managed in 203 input ranges of ADC.
Multi-channel sampling data are stored into respective data buffer storage in data reconstruction module 3, then, to three tunnel sampled datas
It corrects respectively, deletes the obvious errors data occurred in sampling, reduce influence of the random error to result in sampling process, then press
Frame judges each road gathered data, and undistorted and respective channel amplification factor maximum the sampled data all the way of selection, which is reduced, to be removed
With corresponding amplification factor, each frame sampling data of selection are subjected to split, obtain complete, the acquisition knot of high dynamic range
Fruit.
Fig. 2 is the signal sampling principle schematic of Larger Dynamic range signal harvester of the present invention.
It is as shown in Figure 2 in the operation principle of invention：Input signal is divided into identical three road signal, by signal tune
Amplify α respectively after reason circuit1, α2, α3(α1<α2<α3) times.First via signal is amplified into α1Times, make output signal and ADC ranges
Match somebody with somebody, it is ensured that collect the full detail of input signal；Simultaneously by the second road and the 3rd road signal amplification α2, α3Times, and pass through amplitude limit
Circuit ensures amplitude output signal in ADC range abilities, and original signal is amplified to more than ADC maximum ranges, warp by second channel
The larger partial loss of amplitude in signal after amplitude limiter circuit is crossed, but there is the more smaller part of amplitude with respect to first passage in original signal
Big gain, so that ADC to partly having stronger recognition capability and higher sampling precision in signal；Similarly,
Signal is carried out the amplification of more large gain by third channel, then more significantly signal messages are lost after amplitude limiter circuit, but same
When ADC can recognize the smaller signal of amplitude.In this way, three road ADC synchronize input signal sampling, each road is judged by frame
Gathered data, choose undistorted and respective channel amplification factor maximum sampled data all the way carry out it is inverse scale (reduction) i.e. divided by
Corresponding amplification factor obtains the complete, collection result of high dynamic range.
The present invention can effectively improve sampling dynamic range, if the dynamic range for selecting ADC is：
Wherein, VrefFor ADC maximum input ranges, VΔFor ADC minimum resolution amplitudes, then overall dynamic range of the present invention is：
Wherein α1, α3For least gain passage and the amplification factor of maximum gain passage, that is, sample dynamic range and improve：
Fig. 3 is a kind of work flow diagram of Larger Dynamic range signal harvester of the present invention.
In the present embodiment, as shown in figure 3, Larger Dynamic range signal harvester workflow of the present invention is as follows：
1) range, is set according to outside, adjusts signal conditioning circuit gain alpha1, α2, α3(α1<α2<α3)；
2), each ADC synchronizes acquisition channel sampling, stores into respective data buffer storage and carries out Data correction；
3), judge each frame data in maximum gain acquisition channel data buffer storage whether distortion, abandoned if distortion
This frame data of the passage judge maximum gain passage in remaining channel into line distortion, until data are undistorted or to most
Until the latter passage, i.e., the acquisition channel of amplification factor minimum is then selected in sampled data all distortions of all acquisition channels
Sampled data；
4), multiframe sampled data is reduced and split, rebuilds Wave data.
In the present embodiment, three acquisition channels have been used, acquisition channel structure and quantity can be according to realities in actual use
Border situation adjustment, each channel gain can sets itself as requested.
Advantage is summarized
The method relatively as shown in Figure 4 for sampling signal by amplitude etc. point, as seen from Figure 5, this method passes through conjunction
The gain that reason distributes each passage can realize the sampling of similary dynamic range, so using more flexible system structure, less
Port number, that is, acquisition system scale smaller, ADC quantity it is less,
The information of larger gain channel sample signal is included in the sampled result of the medium and small gain channel of the present invention simultaneously, it is smaller
ADC is inadequate to small amplitude signal sampling precision in gain channel, but this part signal is exported with next larger gain passage to ADC
Signal it is identical, the split for high accuracy data in next passage provides reference, convenient for sampled data split with rebuild, reduce
The error that sampled data split occurs.
Although the illustrative specific embodiment of the present invention is described above, in order to the technology of the art
Personnel understand the present invention, it should be apparent that the invention is not restricted to the scope of specific embodiment, to the common skill of the art
For art personnel, if various change appended claim limit and definite the spirit and scope of the present invention in, these
Variation is it will be apparent that all utilize the innovation and creation of present inventive concept in the row of protection.
Claims (2)
1. a kind of Larger Dynamic range signal harvester, which is characterized in that including：
One power-devided circuit, for input signal to be collected to be divided into identical multiple signals；
Multi pass acquisition passage, per road acquisition channel by including signal conditioning circuit, amplitude limiter circuit and ADC, power-devided circuit output
Multiple signals be separately input to multi pass acquisition passage, nursed one's health by signal conditioning circuit, amplitude limiter circuit amplitude limit, ADC is synchronously adopted
Multi-channel sampling data are obtained after sample；Wherein, the amplification factor α of signal conditioning circuit1<α2<,...,<αn；Amplitude limiter circuit to believe
Signal limiting after the conditioning of number modulate circuit is in ADC input ranges；
Data reconstruction module, multi-channel sampling data are stored into respective data buffer storage, judge each road gathered data by frame, are chosen
Undistorted and respective channel amplification factor maximum sampled data all the way is reduced i.e. divided by corresponding amplification factor, and will choosing
Each frame sampling data taken carry out split, and (reconstruction) obtains the complete, collection result of high dynamic range.
2. Larger Dynamic range signal harvester according to claim 1, which is characterized in that the data reconstruction module
In, after multi-channel sampling data are stored into respective data buffer storage, three tunnel sampled datas are corrected respectively, deletes and occurs in sampling
Obvious errors data, reduce influence of the random error to result in sampling process, then judge each road gathered data by frame, selection
Undistorted and respective channel amplification factor maximum sampled data all the way is reduced i.e. divided by corresponding amplification factor, will be chosen
Each frame sampling data carry out split, obtain the complete, collection result of high dynamic range.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112688687A (en) * | 2020-12-09 | 2021-04-20 | 南方电网数字电网研究院有限公司 | Method and device for acquiring physical information to be tested, computer equipment and storage medium |
| CN113267752A (en) * | 2021-05-12 | 2021-08-17 | 中船重工鹏力（南京）大气海洋信息系统有限公司 | Multi-channel wide dynamic data adaptive synthesis and health diagnosis method |
| CN115459774A (en) * | 2022-09-21 | 2022-12-09 | 重庆御芯微信息技术有限公司 | Method for improving sampling rate of analog-digital converter |
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| US8188901B1 (en) * | 2008-08-15 | 2012-05-29 | Hypres, Inc. | Superconductor analog to digital converter |
| CN102138779A (en) * | 2010-02-03 | 2011-08-03 | 深圳市纽泰克电子有限公司 | Wide dynamic physiological signal acquisition system/device/method and high-precision high-resolution oximeter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112688687A (en) * | 2020-12-09 | 2021-04-20 | 南方电网数字电网研究院有限公司 | Method and device for acquiring physical information to be tested, computer equipment and storage medium |
| CN113267752A (en) * | 2021-05-12 | 2021-08-17 | 中船重工鹏力（南京）大气海洋信息系统有限公司 | Multi-channel wide dynamic data adaptive synthesis and health diagnosis method |
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