CN106452446A - Signal conditioning method and circuit based on linear phase front-end high-speed data collection - Google Patents
Signal conditioning method and circuit based on linear phase front-end high-speed data collection Download PDFInfo
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- CN106452446A CN106452446A CN201610919013.8A CN201610919013A CN106452446A CN 106452446 A CN106452446 A CN 106452446A CN 201610919013 A CN201610919013 A CN 201610919013A CN 106452446 A CN106452446 A CN 106452446A
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- speed data
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
Abstract
The invention discloses a signal conditioning method and circuit based on linear phase front-end high-speed data collection. The circuit comprises a constant current source circuit, a low-pass filtering circuit, a first differential circuit, a digital determination circuit, an amplification circuit, a second differential circuit and a wavelet de-noising circuit; the digital determination circuit determines digital-analog conversion signals in double paths of differential signals; the wavelet de-noising circuit reduces a wavelet coefficient generated by de-noising and maintains a coefficient of real signals to the largest extent; and the constant current source circuit, the low-pass filtering circuit, the first differential circuit, the digital determination circuit, the amplification circuit, the second differential circuit and the wavelet de-noising circuit are connected sequentially. The method can be used to amplify, filter and process weak signals generated by a sensor, process the phase information more accurate and condition the weak signals; and the circuit can meet requirements for different parameters, satisfy occasions with higher requirement for signal phase via parameter adjustment, and is higher in using value.
Description
Technical field
The present invention relates to weak signal conditioning field is and in particular to be based on linear phase front end high-speed data acquisition signal condition
Method and modulate circuit.
Background technology
At home and abroad, the acquisition system of the sensor of corresponding type is a lot, but its interference free performance and the anti-mistake of signal
True effect is poor.Traditional leading portion acquisition system mode noise is big, and precision is low, sample frequency is low.And the signal exporting is usually
Have such problems as that temperature drift, signal are weaker and non-linear it is impossible to processed module directly utilizes.Particularly conventionally employed
High pass passive filter method process, its negative effect is larger, and filtering frequency range can change with the change of load, makes entirely
The stability of acquisition system reduces.
Content of the invention
The purpose of the present invention is for the deficiencies in the prior art, and provides one kind to adopt based on linear phase front end high-speed data
Collection signal condition method and modulate circuit, this method ensure that the accurate of analysis, judgement and process to signal phase information；
This circuit has low in energy consumption, good reliability, high precision, the advantage that noise is little, frequency is high.
To achieve these goals, the technical solution used in the present invention is：
Based on linear phase front end high-speed data acquisition signal condition method, comprise the following steps：
1）Piezoelectric acceleration transducer is connected with data collecting system, obtains voltage signal；
2）Remove the direct current signal of piezoelectric acceleration transducer itself, obtain linear phase signal；
3）Pre-sampling is carried out to linear phase signal, one-channel signal is become two-way differential signal；
4）Digital signal judgement is carried out to two-way differential signal, judges whether to carry out programming amplifying and amplification；
5）Amplify the signal after judging；
6）Amplify signal and become double-channel signal from single channel signal, difference channel becomes amplify signal into double from single channel signal
Channel signal；
7）Wavelet Denoising Method is carried out to double-channel signal, and exports initial data and result, ARM is uploaded to for surveying by interface
Amount personnel show and analyze.
Step 2）In remove sensor the direct current signal of itself adopt 8 rank Bessel filters, the increasing of described wave filter
Benefit is 20dB, and upper cut-off frequency is fH=10kHz, stopband attenuation is less than -45dB.
Step 4）In two-way differential signal carried out with the signal of digital-to-analogue conversion judge：Sentenced after D/A converting circuit
Disconnected, when input is for " 0 ", connect with the second outfan；When input is for " 1 ", connect with the first outfan；D/A converting circuit
The second outfan be connected with the positive input of amplifying circuit and be grounded, the first outfan of D/A converting circuit with amplify electricity
The connecting to input of road, reference voltage REF end is connected with the outfan of amplifying circuit, and analogue signal is from D/A converting circuit
Reference voltage REF end inputs；
Realize said method based on linear phase front end high-speed data acquisition signal conditioning circuit, including
Constant-current source circuit, provides current excitation for sampling detector；
Low-pass filter circuit, filters the direct current signal of sampling detector itself；
First difference channel, single channel signal becomes double passage differential signal；
Digital judgement circuit, the signal that two-way differential signal is carried out with digital-to-analogue conversion judges；
Amplifying circuit, the signal after will determine that is amplified；
Second difference channel, single channel signal becomes double passage differential signal；
Wavelet Denoising Method circuit, reduces the wavelet coefficient that cancelling noise produces, and retains the coefficient of actual signal to greatest extent；
Described constant-current source circuit, low-pass filter circuit, the first difference channel, digital judgement circuit, amplifying circuit, the second differential electrical
Road, Wavelet Denoising Method circuit sequence connect.
Low-pass filter circuit is 8 rank Bessel filters, and the gain of wave filter is 20dB, and upper cut-off frequency is fH=
10kHz, stopband attenuation is less than -45dB.
The present invention be used for solve the problems, such as that the single channel signal that sensor transmits is filtered and floating-point amplifier, and ensure right
The accuracy of the analysis of the phase information of signal, judgement and process.
The small-signal that this method is capable of sensor is produced is amplified, filters and processes, and reaches to phase information
The purpose more accurately with to weak signal conditioning processing；This circuit can meet parameters and require, by adjusting parameter, this electricity
Road can meet the occasion that signal phase is had high demands, and has higher use value.
Brief description
Fig. 1 is based on linear phase front end high-speed data acquisition signal conditioning circuit square frame connection figure；
Fig. 2 is constant-current source circuit figure in Fig. 1；
Fig. 3 is low-pass filter circuit figure in Fig. 1；
Fig. 4 is pre-sampling circuit diagram；
Fig. 5 is amplification circuit diagram in Fig. 1；
Potential circuit figure on the basis of Fig. 6；
Fig. 7 is first, second difference channel figure in Fig. 1；
Fig. 8 is A/D sample circuit figure.
Specific embodiment
With reference to the accompanying drawings and examples present invention is described in further detail.It is understood that herein
Described specific embodiment is only used for explaining related content of the invention, rather than the restriction to this invention.
Embodiment：
Based on linear phase front end high-speed data acquisition signal condition method, comprise the following steps：
1）Piezoelectric acceleration transducer is connected with data collecting system, obtains voltage signal signal；
2）Remove the direct current signal of piezoelectric acceleration transducer itself, obtain linear phase signal；
3）Pre-sampling is carried out to linear phase signal, one-channel signal is become two-way differential signal；
4）Digital signal judgement is carried out to two-way differential signal, judges whether to carry out programming amplifying and amplification；
5）Amplify the signal after judging；
6）Amplify signal and become double-channel signal from single channel signal, difference channel becomes amplify signal into double from single channel signal
Channel signal；
7）Wavelet Denoising Method is carried out to double-channel signal, and exports initial data and result, ARM is uploaded to for surveying by interface
Amount personnel show and analyze.
Step 2）In remove sensor the direct current signal of itself adopt 8 rank Bessel filters, the increasing of described wave filter
Benefit is 20dB, and upper cut-off frequency is fH=10kHz, stopband attenuation is less than -45dB.
Step 4）In two-way differential signal carried out with the signal of digital-to-analogue conversion judge：Sentenced after D/A converting circuit
Disconnected, when input is for " 0 ", connect with the second outfan；When input is for " 1 ", connect with the first outfan；D/A converting circuit
The second outfan be connected with the positive input of amplifying circuit and be grounded, the first outfan of D/A converting circuit with amplify electricity
The connecting to input of road, reference voltage REF end is connected with the outfan of amplifying circuit, and analogue signal is from D/A converting circuit
Reference voltage REF end inputs.
As shown in figure 1, realize said method based on linear phase front end high-speed data acquisition signal conditioning circuit, including
Constant-current source circuit, provides current excitation for sampling detector；
Low-pass filter circuit, filters the direct current signal of sampling detector itself；
First difference channel, single channel signal becomes double passage differential signal；
Digital judgement circuit, the signal that two-way differential signal is carried out with digital-to-analogue conversion judges；
Amplifying circuit, the signal after will determine that is amplified；
Second difference channel, single channel signal becomes double passage differential signal；
Wavelet Denoising Method circuit, reduces the wavelet coefficient that cancelling noise produces, and retains the coefficient of actual signal to greatest extent；
Described constant-current source circuit, low-pass filter circuit, the first difference channel, digital judgement circuit, amplifying circuit, the second differential electrical
Road, Wavelet Denoising Method circuit sequence connect.
As shown in Fig. 2 the constant-current source circuit being formed for LM134 using chip, LM134 is three ends adjustable constant-current source device
Part, voltage range is 1-40v, may make up a kind of typical constant-current source circuit, the positive temperature of LM134 by an external resistance
Coefficient is about+0.23 mv/ DEG C.Constant-current source circuit connects piezoelectric acceleration transducer, and provides the current excitation of 4mA for it.
Remove the direct current signal of of sensor itself by the Order RC high pass filter of two electric capacity compositions.
As shown in figure 3, low-pass filter circuit is 8 rank Bessel filters, the gain of wave filter is 20dB, higher cut-off frequency
Rate is fH=10kHz, stopband attenuation is less than -45dB.
In order to reach specific stopband attenuation level, use high-order Bessel filter.Requirement for low pass filter
Gain is 20dB, and the upper cut-off frequency of wave filter is fH=10kHz, and stopband attenuation is less than -45dB, therefore employs 8 ranks
Low-pass Bessel filter.Pass through 8 rank low-pass Bessel filter from the signal of sensor after Order RC high pass filter
Process and obtain a preferable linear phase signal input in the middle of circuit below.
Step 3）The signal of input passes through the pre-sampling circuit in Fig. 4, first passes around the first difference channel, as shown in fig. 7,
The one-channel signal of input is become two-way differential signal, then after 8 A/D sampling A/D chip carry out A/D conversion, the letter that exported
Number enter FPGA process.
Step 4）Signal after FPGA judgement, after having determined amplification, is put by the programmable amplifying circuit of Fig. 5
Greatly, wherein pre-sampling and FPGA also have programmable amplifying circuit to constitute floating-point amplifier circuit.8 input DB7-DB0 of D/A are respectively
Control its internal high-speed analog switch S1-S8.When its input is " 0 ", analog switch is connected with OUT2；When input is
When " 1 ", analog switch is connected with OUT1.Amplifier with the connected mode of 8 D/A is：The OUT2 end of D/A and the forward direction of amplifier
Input connects and is grounded, and the OUT1 end of D/A is connected with the direction input of amplifier, and REF is connected with the outfan of amplifier,
Analogue signal inputs from the REF end of D/A.The circuit structure required by floating-point amplifier thus can be formed.
Step 5）Reference voltage is provided, as shown in fig. 6, setting reference voltage using ADR434 reference voltage source, wherein electricity
Press as 4.096V.It has low noise, in high precision, the performance of low excursion with temperature.
Step 6）In the second difference channel will become bilateral from the amplification signal of floating-point amplifier circuit from single channel signal
Road signal, and be input in A/D sample circuit.
Step 7）In for 16 A/D sampling A/D chip, as shown in figure 8, being responsible for the dual pathways letter come in from difference channel
Number carry out sampling processing, and the data is activation having gathered to DSP is analyzed judge.Setup parameter carries out Wavelet Denoising Method, and will
Initial data and result are uploaded to ARM by interface and show for survey crew and analyze.
Claims (4)
1. it is based on linear phase front end high-speed data acquisition signal condition method it is characterised in that comprising the following steps：
1）Piezoelectric acceleration transducer is connected with data collecting system, obtains voltage signal signal；
2）Remove the direct current signal of piezoelectric acceleration transducer itself, obtain linear phase signal；
3）Pre-sampling is carried out to linear phase signal, one-channel signal is become two-way differential signal；
4）Digital signal judgement is carried out to two-way differential signal, judges whether to carry out programming amplifying and amplification；
5）Amplify the signal after judging；
6）Amplify signal and become double-channel signal from single channel signal；
7）Wavelet Denoising Method is carried out to double-channel signal, and exports initial data and result.
2. according to claim 1 based on linear phase front end high-speed data acquisition signal condition method it is characterised in that
Step 2）In remove the direct current signal of of sensor itself and adopt 8 rank Bessel filters, the gain of described wave filter is 20dB,
Upper cut-off frequency is fH=10kHz, stopband attenuation is less than -45dB.
3. it is based on linear phase front end high-speed data acquisition signal conditioning circuit it is characterised in that including
Constant-current source circuit, provides current excitation for sampling detector；
Low-pass filter circuit, filters the direct current signal of sampling detector itself；
First difference channel, single channel signal becomes double passage differential signal；
Digital judgement circuit, the signal that two-way differential signal is carried out with digital-to-analogue conversion judges；
Amplifying circuit, the signal after will determine that is amplified；
Second difference channel, single channel signal becomes double passage differential signal；
Wavelet Denoising Method circuit, reduces the wavelet coefficient that cancelling noise produces, and retains the coefficient of actual signal to greatest extent；
Described constant-current source circuit, low-pass filter circuit, the first difference channel, digital judgement circuit, amplifying circuit, the second differential electrical
Road, Wavelet Denoising Method circuit sequence connect.
4. according to claim 3 based on linear phase front end high-speed data acquisition signal conditioning circuit it is characterised in that
Described low-pass filter circuit is 8 rank Bessel filters, and the gain of wave filter is 20dB, and upper cut-off frequency is fH=10kHz,
Stopband attenuation is less than -45dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610919013.8A CN106452446A (en) | 2016-10-21 | 2016-10-21 | Signal conditioning method and circuit based on linear phase front-end high-speed data collection |
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|---|---|---|---|
| CN201610919013.8A CN106452446A (en) | 2016-10-21 | 2016-10-21 | Signal conditioning method and circuit based on linear phase front-end high-speed data collection |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111049500A (en) * | 2019-12-31 | 2020-04-21 | 西安中科微精光子制造科技有限公司 | Filter for decomposing galvanometer and servo position |
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