CN208851485U - A kind of brain wave acquisition device based on active electrode - Google Patents
A kind of brain wave acquisition device based on active electrode Download PDFInfo
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- CN208851485U CN208851485U CN201721511415.0U CN201721511415U CN208851485U CN 208851485 U CN208851485 U CN 208851485U CN 201721511415 U CN201721511415 U CN 201721511415U CN 208851485 U CN208851485 U CN 208851485U
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Abstract
The utility model discloses a kind of brain wave acquisition device based on active electrode, it includes active electrode, eeg signal acquisition device and electrode wires, electrode wires are connected between active electrode and eeg signal acquisition device, active electrode is built-in with electrode for encephalograms and unity gain amplifier, eeg signal acquisition device includes sequentially connected difference amplifier, data converter, digital signal processor and interface circuit, in which: electrode for encephalograms is for obtaining EEG signals；Unity gain amplifier is for after amplifying processing to EEG signals；Difference amplifier is used for the electric signal differential amplification that exports unity gain amplifier to presupposition multiple；Data converter is used to the electric signal that difference amplifier exports being converted to digital signal；The digital signal processor digital signal that converter exports for receiving data is simultaneously uploaded to upstream plant by interface circuit.The utility model improves anti-interference and signal acquisition quality, while having the characteristics that miniaturization, portability.
Description
Technical field
The utility model relates to eeg signal acquisition device more particularly to a kind of brain wave acquisition dresses based on active electrode
It sets.
Background technique
EEG signals contain a large amount of physiology and pathological information, can be not only doctor by the processing to EEG signals
It is raw that the foundation of clinical diagnosis is provided, effective auxiliary treatment means can also be provided for certain cerebral diseases.Both at home and abroad for brain electricity
The research of signal progress specificity analysis and feature extraction has been achieved great progress and achievement.The main feature of EEG signals
Are as follows: EEG signals amplitude is 5uV~100uV, generally only 50uV or so；Frequency range is 0.5Hz~35Hz, is had extremely strong
Power frequency 50Hz interference and polarizing voltage interference；Internal resistance is not equal from several kilohms to several hundred kilohms and is easy to change.
The eeg collection system or equipment of mainstream in the market, is built using separating component, and volume is big, stupid
Weight is not portable；And these schemes are substantially all using single-chip microcontroller as data conversion and controller, collect signal accuracy phase
To lower.In traditional brain wave acquisition circuit, since human body internal resistance is larger and the factor of contact resistance, acquisition electrode are adopted mostly
With wet electrode, contact resistance is substantially reduced, and is similarly reduced to the resistance requirements of rear class, therefore emitter following can not be used in the program
Device improves the input impedance of Acquisition Circuit, but makes gathered person acquire a large amount of conductive pastes of site residues using wet electrode, causes
Very big inconvenience.
In the prior art, referring to figs. 1 and 2, in the acquisition scheme using dry electrode, brain wave acquisition electrode 100 is logical
It crosses electrode wires 101 and is connected to collecting circuit board 106, collecting circuit board 106 includes sequentially connected emitter follower 102, instrument
In the program, emitter follower is added in the front end of collecting circuit board 106 in amplifier 103, data converter 104 and single-chip microcontroller 105
102, to improve the input impedance of Acquisition Circuit, but in general, from brain wave acquisition electrode 100 to emitter follower 102 it
Between have longer electrode wires 101, will lead to collected signal and generate biggish fluctuation.And the program uses single-chip microcontroller conduct
Data conversion and controller, it is relatively low to collect signal accuracy.
It can be seen that two schemes in the prior art, since EEG signals amplitude is very low, emitter follower and instrument amplifier
Equivalent input noise can all reduce the signal-to-noise ratio of signal acquisition circuit, and single-chip microcontroller is mostly used to carry out data conversion and place greatly
Reason, causes signal accuracy relatively low.Meanwhile existing market midbrain electricity acquisition scheme mainly use discrete component build and
At volume is big and acquisition mode is not easy.In addition, according to wet electrode scheme, although available more stable and accurate letter
Number, but a large amount of conductive pastes are remained after acquiring, it puts to no little inconvenience.
Utility model content
The technical problem to be solved by the present invention is in view of the deficiencies of the prior art, provide a kind of utilization active electricity
The anti-interference and signal acquisition quality of acquisition device are improved in pole, while realizing acquisition device miniaturization, portability, collection process
The brain wave acquisition device based on active electrode of easy.
In order to solve the above technical problems, the utility model adopts the following technical solution.
A kind of brain wave acquisition device based on active electrode comprising active electrode, eeg signal acquisition device and electrode wires,
The electrode wires are connected between active electrode and eeg signal acquisition device, and the active electrode is built-in with electrode for encephalograms and unit
Gain amplifier, the eeg signal acquisition device include sequentially connected difference amplifier, data converter, at digital signal
Manage device and interface circuit, in which: the electrode for encephalograms is for obtaining EEG signals and being transmitted to unity gain amplifier；The list
Position gain amplifier is for being transmitted to difference by electrode wires and putting after amplifying processing to the EEG signals that electrode for encephalograms acquires
Big device；The difference amplifier is used to be transmitted to after electric signal differential amplification to presupposition multiple that unity gain amplifier exports
Data converter；The data converter is for being converted to digital signal for the electric signal that difference amplifier exports and being transmitted to number
Word signal processor；The digital signal processor digital signal that converter exports for receiving data simultaneously passes through interface circuit
It is uploaded to upstream plant.
Preferably, the eeg signal acquisition device includes the power module for power supply.
Preferably, the input terminal of the difference amplifier is in series with the first chopper circuit.
Preferably, first chopper circuit includes the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th MOS
An input after pipe, the drain electrode of first metal-oxide-semiconductor and the drain electrode interconnection of the second metal-oxide-semiconductor as the first chopper circuit
Another input after end, the drain electrode of the third metal-oxide-semiconductor and the drain electrode interconnection of the 4th metal-oxide-semiconductor as the first chopper circuit
End, an output after the source electrode interconnection of the source electrode and the 4th metal-oxide-semiconductor of second metal-oxide-semiconductor as the first chopper circuit
End, another output after the source electrode interconnection of the source electrode and third metal-oxide-semiconductor of first metal-oxide-semiconductor as the first chopper circuit
End, the grid of first metal-oxide-semiconductor, the grid of the second metal-oxide-semiconductor, the grid of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor grid use respectively
In incoming clock signal, the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are controlled by the clock signal
On off operating mode, to enable first chopper circuit carry out chopping modulation to the electric signals of differential amplifier inputs.
Preferably, the output end of the difference amplifier is in series with the second chopper circuit, the electricity of second chopper circuit
Line structure is identical as the first chopper circuit.
Preferably, the eeg signal acquisition device includes clock circuit, and the clock circuit is used for as the first copped wave electricity
Road and the second chopper circuit provide clock signal.
Brain wave acquisition device disclosed by the utility model based on active electrode, by using the active of ultra-high input impedance
Electrode eliminates the internal resistance of electrode wires and human body brain, eliminates contact resistance between electrode for encephalograms and human body etc. to signal
Influence, while the difference amplifier and high-precision data converter of low noise are integrated in eeg signal acquisition device, greatly
The signal-to-noise ratio of signal acquisition circuit is improved greatly, and improves the anti-interference and signal acquisition quality of acquisition device, while this
Utility model is built without more discrete component, so that brain wave acquisition device more minimizes, portability feature.
Detailed description of the invention
Fig. 1 is the composition block diagram of brain wave acquisition device in the prior art.
Fig. 2 is the signal processing flow figure of brain wave acquisition device in the prior art.
Fig. 3 is the composition block diagram of the utility model brain wave acquisition device.
Fig. 4 is the schematic diagram of the first chopper circuit.
Fig. 5 is the signal processing flow figure of the utility model brain wave acquisition device.
Specific embodiment
The utility model is described in more detail with reference to the accompanying drawings and examples.
The utility model discloses a kind of brain wave acquisition device based on active electrode, referring to figure 3. comprising active electricity
Pole 1, eeg signal acquisition device 2 and electrode wires 3, the electrode wires 3 are connected between active electrode 1 and eeg signal acquisition device 2,
The active electrode 1 is built-in with electrode for encephalograms 10 and unity gain amplifier 11, and the eeg signal acquisition device 2 includes successively
Difference amplifier 20, data converter 21, digital signal processor 22 and the interface circuit 23 of connection, in which:
The electrode for encephalograms 10 is for obtaining EEG signals and being transmitted to unity gain amplifier 11；
The unity gain amplifier 11 is for passing through after amplifying processing to the EEG signals that electrode for encephalograms 10 acquires
Electrode wires 3 are transmitted to difference amplifier 20；
The difference amplifier 20 is used for the electric signal differential amplification that exports unity gain amplifier 11 to presupposition multiple
After be transmitted to data converter 21；
The data converter 21 is for being converted to digital signal for the electric signal that difference amplifier 20 exports and being transmitted to
Digital signal processor 22；
The digital signal processor 22 digital signal that converter 21 exports for receiving data simultaneously passes through interface circuit
23 are uploaded to upstream plant.
Above-mentioned brain wave acquisition device eliminates electrode wires and human body by using the active electrode 1 of ultra-high input impedance
The internal resistance of brain is eliminated the influence to signal such as contact resistance between electrode for encephalograms 10 and human body, while being adopted in EEG signals
It is integrated with the difference amplifier 20 and high-precision data converter 21 of low noise in storage 2, substantially increases signal acquisition electricity
The signal-to-noise ratio on road, and the anti-interference and signal acquisition quality of acquisition device are improved, while the utility model is without more
Discrete component is built, so that brain wave acquisition device more minimizes, portability feature.
In the present embodiment, the eeg signal acquisition device 2 includes the power module 24 for power supply.
In practical application, since EEG signals amplitude is 5uV~100uV, generally only 50uV or so；Frequency range is
0.5Hz~35Hz, within the scope of this low-frequency band, the 1/f flicker noise of device is particularly important, and directly limiting can be with
The useful signal level magnitudes of processing.Therefore, the present embodiment holds difference amplifier section to introduce chopping modulation circuit before acquisition,
It specifically refers to:
In conjunction with shown in Fig. 3 and Fig. 4, the input terminal of the difference amplifier 20 is in series with the first chopper circuit 25.Further
Ground, first chopper circuit 25 include the first metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4,
It is defeated as one of the first chopper circuit 25 after the drain electrode of the first metal-oxide-semiconductor Q1 and the drain electrode interconnection of the second metal-oxide-semiconductor Q2
Enter end, as the another of the first chopper circuit 25 after the drain electrode of the third metal-oxide-semiconductor Q3 and the drain electrode interconnection of the 4th metal-oxide-semiconductor Q4
One input terminal, the source electrode of the second metal-oxide-semiconductor Q2 and the source electrode of the 4th metal-oxide-semiconductor Q4 are used as the first chopper circuit after being connected with each other
25 output end, the source electrode of the first metal-oxide-semiconductor Q1 and the source electrode of third metal-oxide-semiconductor Q3 are used as the first copped wave after being connected with each other
The another output of circuit 25, the grid of the first metal-oxide-semiconductor Q1, the grid of the second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3 grid
The grid of pole and the 4th metal-oxide-semiconductor Q4 are respectively used to incoming clock signal, controlled by the clock signal the first metal-oxide-semiconductor Q1,
The on off operating mode of second metal-oxide-semiconductor Q2, third metal-oxide-semiconductor Q3 and the 4th metal-oxide-semiconductor Q4, to enable first chopper circuit 25 to put difference
The electric signal of 20 input terminal of big device carries out chopping modulation.
In the present embodiment, the output end of the difference amplifier 20 is in series with the second chopper circuit 26, second copped wave
The circuit structure of circuit 26 is identical as the first chopper circuit 25.
In above-mentioned chopper circuit, the collected signal of active electrode 1 is passed through chopping frequency by the first chopper circuit 25
Fchop is modulated at upper frequency, such as several KHz, while flicker noise and systematic error offset also can be modulated onto the frequency
At rate range, only device white noise plays a major role in this frequency range, therefore system overall noise substantially reduces, and then second
Chopper circuit 26 by within the scope of the output signal modulation letter in reply basic frequency of difference amplifier 20, reaches low input noise again
Design object.
In the present embodiment, the eeg signal acquisition device 2 includes clock circuit 27, and the clock circuit 27 is used to be the
One chopper circuit 25 and the second chopper circuit 26 provide clock signal.
In brain wave acquisition device disclosed by the utility model based on active electrode, active electrode 1 combines built-in unit to increase
The active electrode of beneficial amplifier, realizes the function of human body electroencephalogram's signal acquisition, and eeg signal acquisition device 2 includes integrated belt in full sheet
There are difference amplifier 20, high-precision data converter 21, digital signal processor 22, the clock electricity of copped wave function and low noise
Road 27, common mode driving circuit 28, power module 24 and interface circuit 23.Wherein, eeg signal acquisition electrode and unit gain
Amplifier, forms active electrode, which is suitable for dry and wet electrode scheme, after unity gain amplifier is placed in electrode, directly adopts
Electric potential signal on collector, due to its strong driving capability, which is had strong anti-interference ability, and passes through electrode lead
Line is sent to eeg signal acquisition device piece front end；The signal by with the difference amplifier of copped wave function amplify certain multiple after,
Digital signal is converted by data converter, after being handled by specific digital circuit, is transferred out by interface circuit to rear end
Master control.The amplifier is placed directly within and is adopted in such a way that unity gain amplifier and acquisition electrode is integrated by the utility model
After current collection pole piece, input impedance is improved, and reduce influence of the ghost effects such as contact resistance to signal acquisition, and then form
Active acquisition electrode.
In order to better describe the technical solution of the utility model, the invention also discloses one kind to be based on active electrode
Brain wave acquisition method, in conjunction with shown in Fig. 3 to Fig. 5, this method based on a device realize, described device includes active electrode 1, brain
Electrical signal collection device 2 and electrode wires 3, the electrode wires 3 are connected between active electrode 1 and eeg signal acquisition device 2, described to have
Source electrode 1 is built-in with electrode for encephalograms 10 and unity gain amplifier 11, and the eeg signal acquisition device 2 includes sequentially connected
Difference amplifier 20, data converter 21, digital signal processor 22 and interface circuit 23, which comprises
Step S1, the electrode for encephalograms 10 obtain EEG signals and are transmitted to unity gain amplifier 11；
Step S2, after the EEG signals that the unity gain amplifier 11 acquires electrode for encephalograms 10 amplify processing,
Difference amplifier 20 is transmitted to by electrode wires 3；
Step S3, the electric signal differential amplification that the difference amplifier 20 exports unity gain amplifier 11 is to default times
Data converter 21 is transmitted to after number；
The electric signal that difference amplifier 20 exports is converted to digital signal and transmitted by step S4, the data converter 21
To digital signal processor 22；
Step S5, the digital signal processor 22 receive the digital signal that data converter 21 exports and by interface electricity
Road 23 is uploaded to upstream plant.
In the above method, the eeg signal acquisition device 2 includes power module 24, is to have using the power module 24
Source electrode 1 and eeg signal acquisition device 2 are powered.
The above method further includes copped wave treatment process: the input terminal of the difference amplifier 20 is in series with the first chopper circuit
25, the output end of the difference amplifier 20 is in series with the second chopper circuit 26.Further, the eeg signal acquisition device 2
Include clock circuit 27, and is that the first chopper circuit 25 and the second chopper circuit 26 provide clock letter by the clock circuit 27
Number.
Brain wave acquisition device disclosed by the utility model based on active electrode, compared to existing technologies, this is practical new
Type uses the implementation of integrated brain wave acquisition device, so that acquisition device miniaturization, portability, collection process easy；
Meanwhile the utility model integrates unity gain amplifier and acquisition electrode, forms active electrode, and it is anti-interference to improve acquisition system
Property with signal acquisition quality；In addition, the utility model introduces chopper circuit in terminal circuit difference amplifier front and back before acquisition, to
System noise is reduced, acquisition signal-to-noise ratio is improved.
The above is the utility model preferred embodiment, is not intended to limit the utility model, all practical at this
Modification, equivalent replacement or the improvement etc. made in novel technical scope, should be included in the model that the utility model is protected
In enclosing.
Claims (6)
1. a kind of brain wave acquisition device based on active electrode, which is characterized in that including active electrode, eeg signal acquisition device and
Electrode wires, the electrode wires are connected between active electrode and eeg signal acquisition device, and the active electrode is built-in with brain electricity electricity
Pole and unity gain amplifier, the eeg signal acquisition device include sequentially connected difference amplifier, data converter, number
Word signal processor and interface circuit, in which:
The electrode for encephalograms is for obtaining EEG signals and being transmitted to unity gain amplifier；
The unity gain amplifier by electrode wires for being passed after amplifying processing to the EEG signals that electrode for encephalograms acquires
Transport to difference amplifier；
The difference amplifier is used to be transmitted to after electric signal differential amplification to presupposition multiple that unity gain amplifier exports
Data converter；
The data converter is for being converted to digital signal for the electric signal that difference amplifier exports and being transmitted to digital signal
Processor；
The digital signal processor digital signal that converter exports for receiving data is simultaneously uploaded to by interface circuit
Row equipment.
2. the brain wave acquisition device based on active electrode as described in claim 1, which is characterized in that the eeg signal acquisition
Device includes the power module for power supply.
3. the brain wave acquisition device based on active electrode as described in claim 1, which is characterized in that the difference amplifier
Input terminal is in series with the first chopper circuit.
4. the brain wave acquisition device based on active electrode as claimed in claim 3, which is characterized in that first chopper circuit
It include the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor, the drain electrode of first metal-oxide-semiconductor and the second metal-oxide-semiconductor
Drain electrode be connected with each other after an input terminal as the first chopper circuit, the drain electrode of the third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor
Another input terminal as the first chopper circuit after drain electrode is connected with each other, the source electrode of second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor
An output end after source electrode interconnection as the first chopper circuit, the source electrode of first metal-oxide-semiconductor and the source of third metal-oxide-semiconductor
Another output as the first chopper circuit after pole is connected with each other, the grid of the grid of first metal-oxide-semiconductor, the second metal-oxide-semiconductor
The grid of pole, the grid of third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is respectively used to incoming clock signal, controls by the clock signal
The on off operating mode of the first metal-oxide-semiconductor, the second metal-oxide-semiconductor, third metal-oxide-semiconductor and the 4th metal-oxide-semiconductor is made, to enable first chopper circuit to difference
The electric signal of amplifier in is divided to carry out chopping modulation.
5. the brain wave acquisition device based on active electrode as claimed in claim 4, which is characterized in that the difference amplifier
Output end is in series with the second chopper circuit, and the circuit structure of second chopper circuit is identical as the first chopper circuit.
6. the brain wave acquisition device based on active electrode as claimed in claim 5, which is characterized in that the eeg signal acquisition
Device includes clock circuit, and the clock circuit is used to provide clock signal for the first chopper circuit and the second chopper circuit.
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| CN201721511415.0U CN208851485U (en) | 2017-11-13 | 2017-11-13 | A kind of brain wave acquisition device based on active electrode |
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| CN201721511415.0U CN208851485U (en) | 2017-11-13 | 2017-11-13 | A kind of brain wave acquisition device based on active electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114983424A (en) * | 2022-08-03 | 2022-09-02 | 之江实验室 | Multichannel mixed chopping method and system applied to brain-computer interface chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114983424A (en) * | 2022-08-03 | 2022-09-02 | 之江实验室 | Multichannel mixed chopping method and system applied to brain-computer interface chip |
| CN114983424B (en) * | 2022-08-03 | 2022-11-15 | 之江实验室 | Multichannel mixed chopping method and system applied to brain-computer interface chip |
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