CN101917197B - Double-channel analog/digital combined variable gain data acquisition device - Google Patents
Double-channel analog/digital combined variable gain data acquisition device Download PDFInfo
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- CN101917197B CN101917197B CN 201010256464 CN201010256464A CN101917197B CN 101917197 B CN101917197 B CN 101917197B CN 201010256464 CN201010256464 CN 201010256464 CN 201010256464 A CN201010256464 A CN 201010256464A CN 101917197 B CN101917197 B CN 101917197B
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Abstract
The invention relates to a double-channel analog/digital (A/D) combined variable gain data acquisition device. The device comprises a primary amplifying and conditioning circuit, two parallel amplifying circuits, an A/D conversion module and a digital control module, wherein the output ends of the primary amplifying and conditioning circuit are separately connected with the input ends of the two parallel programmable amplifiers in a two-way parallel programmable amplifier circuit; the output ends of the two parallel programmable amplifiers are separately connected with the corresponding input channels of the A/D conversion module; the A/D conversion module is connected with the digital control module; and the digital control module reads the sampling value which is through A/D conversion and sends a control signal to control the A/D conversion process and change the gains of the programmable amplifiers. The acquisition device can be used to increase the dynamic range and span of measurement, ensure the sampling accuracy of weak signals and large-range signals and realize high-speed and high-accuracy data acquisition; and the method is more suitable for the detection of the analog of which size is unknown and variation range is wider.
Description
Technical field
The present invention relates to a kind of variation tendency according to signal and in advance the data acquisition unit dynamically adjusted is carried out in the gain of amplifying circuit, belong to the data acquisition technology field.
Background technology
In measuring system, the excursion of some signals is larger.To the measured signal of these suddenly big or suddenly small variations, if amplifying circuit adopts fixed gain, tend to cause in certain range ability of signal can not be well to be complementary with the range of A/D converter.For example for small-signal, amplifying circuit just needs larger gain could satisfy the range requirement of A/D converter, realizes accurately measuring.But for the larger measured signal of amplitude, if still adopt larger gain, can exceed the range of A/D converter after signal amplifies, can't realize correct measurement.
Therefore, in order to realize the accurate measurement to the larger unknown signaling of these excursions, can adjust along with the variation of signal with regard to the gain that requires amplifying circuit, guarantee that measured signal is in the range ability of A/D converter.At present, some data acquisition unit can be adjusted the gain of amplifier.But in these data acquisition units, measured signal is all to be amplified into the input channel of A/D converter by No. one amplifier.Only have after measured signal exceeds the suitable range of A/D conversion, it is improper that acquisition system could be judged the gain of amplifying circuit from the invalid data that has gathered, and then gain adjusted again.So not only caused the loss of effective information, affect the precision of data acquisition, and the change of gain also needs the stabilization process of a circuit, this has just increased the extra stand-by period, thereby restricted the speed of data acquisition, need the application scenario of high speed acquisition for some, this unfavorable factor is particularly evident.Therefore, for some high accuracy, high-speed data acquisition, the device of the change of this routine gain can't be satisfied the demand.
Summary of the invention
The purpose of this invention is to provide a kind of parallel binary channels, the data acquisition unit of analog circuit and digital circuit synergy and gain-variable, to eliminate the instant circuit settling time that gain is consumed, high speed, the high-accuracy data acquisition of realization to measured signal of changing in traditional harvester.
for achieving the above object, double-channel analog/digital combined variable gain data acquisition device of the present invention comprises elementary amplification modulate circuit, the two-way programmable amplifying circuit that walks abreast, A/D modular converter and digital control circuit, the output of described elementary amplification modulate circuit is connected with the inputs of two parallel programmable amplifiers in the parallel programmable amplifying circuit of two-way respectively, the output of described two parallel programmable amplifiers is connected with the corresponding input channel of A/D modular converter respectively, described A/D modular converter is connected with digital control module, described digital control module reads through the sampling numerical value of A/D conversion and sends the gain that control signal is controlled the A/D transfer process and changed programmable amplifier.
Further, described digital control module is comprised of the DSP with high-speed figure disposal ability, and the A/D modular converter mainly is comprised of the A/D chip of high-speed, high precision, and it can carry out the A/D conversion simultaneously to the analog input of a plurality of passages.
Further, one tunnel measured signal is amplified with the parallel programmable amplifier that arranges of two-way, the electric parameter of two-way programmable amplifier is identical, gains adjustable.
Double-channel analog/digital combined variable gain data acquisition device of the present invention adopts the mode of hardware redundancy that forward path is configured, and each road input signal all disposes two parallel programmable amplifiers.Like this, one road tested analog signal just becomes two signals with different amplification and is connected with the different switching passage of A/D converter respectively.Under the control of digital signal processing module DSP, two passages are converted into digital quantity simultaneously, but DSP only reads numerical value and the preservation of a passage, and this passage is called active channel, and the data of another passage are disregarded, and this passage is idle channel.By the analysis to the historical data that gathered, the variation tendency of DSP judgement signal also presets the gain of idle channel accordingly, and the variation of itself and signal is complementary.When signal intensity reaches setting threshold, just read the numerical value of idle channel, this passage just becomes active channel, because this passage has preset suitable gain in advance, therefore can realize the correct sampling to measured signal.Original occupied passage becomes idle channel, and its gain constantly changes along with the variation of signal.This processing method is by reading numerical values in turn between two passages, measured signal is amplified in suitable range ability, guarantee the precision of signals collecting, also eliminated the necessary current stabilization time of Iterim Change circuit gain, guaranteed the high-speed of signals collecting.This harvester can improve dynamic range and the range of measurement, has guaranteed the sampling precision of small-signal and wide range signal, has realized at a high speed, high-precision data acquisition, relatively is applicable to the detection to unknown size and the larger analog quantity of excursion.
Description of drawings
Fig. 1 is the theory diagram of the embodiment of the present invention.
Fig. 2 is the alternating signal curve chart of the embodiment of the present invention.
Embodiment
Double-channel analog/digital combined variable gain data acquisition device embodiment theory diagram of the present invention as shown in Figure 1, this device comprises elementary amplifying circuit, two-way parallel amplifying circuit, A/D modular converter and digital control module.Elementary amplification modulate circuit carries out preliminary amplification and conditioning to tested input signal, and signal is through sending into the two-way programmable amplifier of the parallel amplifying circuit of two-way after tentatively nursing one's health, and these two programmable amplifiers have identical electric parameter, but its gain is adjustable.Like this, input signal is sent into the respective channel of A/D converter with regard to being exaggerated into two signals with different amplitudes.A/D converter is changed the signal of two input channels simultaneously, but digital signal processing module DSP only reads the numerical value of a passage, and as idle channel, its numerical value is disregarded another passage.The historical data analysis that DSP had gathered together with the past to this sampled value contrasts and judges the variation tendency of signal, according to signal intensity trend, the gain of idle channel programmable amplifier is preset.If signal is in ascendant trend, generally should reduce amplifier gain; If signal is in downward trend, strengthen the gain of amplifier.The principle of gain preset is to guarantee that signal is in the best range ability of A/D converter after amplifying, thereby improves the consistency of sampling precision and data.
(4/5 of common upper limit threshold taken amount journey when signal intensity exceeds the range threshold value of setting, lower threshold taken amount journey 1/5), in the next sampling period, read the numerical value of idle channel, idle channel is become the passage and its gain that take at present remain unchanged, to keep the consistency of data; Originally the passage that took becomes idle channel, and its gain is constantly preset along with the variation of signal.According to presetting or choose at random first during the selector channel, follow-up selected be to choose according to the variation tendency of signal the passage that has preset suitable gain.because this device is provided with the parallel input channel of two-way, one of them passage is realized gathering, the gain of another passage constantly changes along with the variation of signal, realize data acquisition according to the passage that the situation of change of signal is selected to have most suitable gain, remain that measured signal is in the best range ability of A/D converter, so the present invention has eliminated the circuit stabilization time that the Iterim Change gain produces, need not range switches, guaranteed sampling precision, enlarged dynamic range, improved sampling rate, that a kind of modulus connection and method utilized enlarges the sampling range, improve sensitivity, guarantee the data acquisition unit of high-speed sampling.
Shown in Fig. 2 be a more typical alternating signal, as follows to the acquisition step of this signal: in the t1 moment, the amplitude that A is ordered is v1, the gain of supposing passage 1 is fit to this signal, from the A point, the conversion value of passage 1 is preserved as signal sampling value, the conversion value of passage 2 will not adopt.In data acquisition, the gain of passage 1 remains unchanged, and the gain of passage 2 is adjusted along with the continuous trend that increases of signal, and the gain of passage 2 and the variation of signal are complementary.At the B point, the amplitude of signal is v2, has reached the upper threshold of passage 1 range, therefore, from the B point, the conversion value of passage 2 is also preserved as sampled value, and its gain remains unchanged; Passage 1 is as idle channel, and its gain reduces with the increase of signal, and purpose is to guarantee that signal still is in the suitable range ability of A/D converter after amplifying.At the C point, signal reaches maximum amplitude v3, but does not surpass the upper threshold that passage 2 is set, and therefore still adopts passage 2 to realize data acquisition.After the C point, signal is in downward trend, and the gain of passage 1 is adjusted thereupon, is in the range ability of A/D conversion after amplifier 1 amplifies to guarantee signal.At the D point, the amplitude of signal is v2, has reached the lower limit of passage 2 setting thresholds, from the D point, utilizes passage 1 to realize data acquisition, and with passage 2 as idle channel, its gain is preset with the variation of signal, for next switching channel is got ready.
Claims (2)
1. data acquisition unit, it is characterized in that: this device comprises elementary amplification modulate circuit, the two-way programmable amplifying circuit that walks abreast, A/D modular converter and digital control circuit, the output of described elementary amplification modulate circuit is connected with the inputs of two parallel programmable amplifiers in the parallel programmable amplifying circuit of two-way respectively, the output of described two parallel programmable amplifiers is connected with the corresponding input channel of A/D modular converter respectively, described A/D modular converter is connected with digital control module, described A/D modular converter is changed the signal of two input channels simultaneously, digital control module only reads the numerical value of a passage, another passage as idle channel, its numerical value is disregarded, the historical data analysis that digital control module had gathered together with the past to this sampled value contrasts and judges the variation tendency of signal, according to signal intensity trend, the gain of idle channel programmable amplifier is preset, the variation of itself and signal is complementary, described digital control module is comprised of the DSP with high-speed figure disposal ability, the A/D modular converter mainly is comprised of the A/D chip of high-speed, high precision, it can carry out the A/D conversion simultaneously to the analog input of a plurality of passages.
2. data acquisition unit according to claim 1 is characterized in that: one tunnel measured signal is amplified with the parallel programmable amplifier that arranges of two-way, and the electric parameter of two-way programmable amplifier is identical, gains adjustable.
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| CN 201010256464 CN101917197B (en) | 2010-08-19 | 2010-08-19 | Double-channel analog/digital combined variable gain data acquisition device |
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| CN 201010256464 CN101917197B (en) | 2010-08-19 | 2010-08-19 | Double-channel analog/digital combined variable gain data acquisition device |
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| CN106154023B (en) * | 2015-04-09 | 2019-12-24 | 维谛技术有限公司 | Signal acquisition device |
| CN105004798B (en) * | 2015-06-30 | 2017-10-27 | 中南大学 | A kind of signal intelligent amplifying device and method for foundation pile ultrasonic detecting equipment |
| CN105974343B (en) * | 2016-06-20 | 2018-08-24 | 吉林大学 | Ground magnetic resonance signal detection device with Gain Automatic regulatory function and detection method |
| CN110646689A (en) * | 2019-09-10 | 2020-01-03 | 许继集团有限公司 | Traveling wave distance measurement method and device adopting same-source double-sampling mode |
| CN110940416A (en) * | 2019-11-18 | 2020-03-31 | 武汉光谷信息光电子创新中心有限公司 | Multichannel parallel photoelectric detection circuit structure |
| CN114236222A (en) * | 2021-12-03 | 2022-03-25 | 北京东方计量测试研究所 | Electrostatic probe current measuring device |
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| CN1321315C (en) * | 2005-05-27 | 2007-06-13 | 南京航空航天大学 | Flexible strain signal spot colletion system |
| CN101188058A (en) * | 2007-10-29 | 2008-05-28 | 杭州锐达数字技术有限公司 | Data collection system and method based on multi-digital path and intercrossed calibration |
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