CN206777308U - Wearable biological signal collecting device - Google Patents
Wearable biological signal collecting device Download PDFInfo
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- CN206777308U CN206777308U CN201621419577.7U CN201621419577U CN206777308U CN 206777308 U CN206777308 U CN 206777308U CN 201621419577 U CN201621419577 U CN 201621419577U CN 206777308 U CN206777308 U CN 206777308U
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Abstract
The utility model discloses a kind of wearable biological signal collecting device, including photoemission unit, and it includes several light emitting diodes, connected constant-flow driver and light source channel to channel adapter；Opto-electronic receiver unit, it comprises at least two-way photodiode, detection channels selector, sampling and change-over switch array and analog-digital converter, it is different per the optical path length between road photodiode and light emitting diode, photodiode is connected with sampling with change-over switch array and digital analog converter successively by detection channels selector, and digital analog converter is connected by an interface module with external controller；Timing control unit, it is communicated to connect with interface module, and timing control unit includes the timer and multichannel trigger being connected.The utility model employs integrated form scheme, and detecting function is more comprehensive, alleviates the complexity of design, adds the reliability of circuit, improves convenience and the flexibility of debugging.
Description
Technical field
It the utility model is related to Photobiology technical field, and in particular to a kind of wearable biological signal collecting device.
Background technology
Existing optical detection or photoelectric sense technology have reached its maturity, and its front-end circuit mainly includes light source led
The design of control section and photodiode (PD) detection circuit part, is applied to people by optical monitoring or photoelectric sense technology
Body, optical bio sensing technology are constantly applied to health care industry., can with the horizontal continuous improvement of health, health care
By extensive concern, shield of escorting increasingly is provided for daily life, health care for wearable Medical Devices, medicine equipment
Boat, wherein wearable optical bio sensing technology is exactly key therein.
Wearable optical bio sensing, be mainly used in measuring heart rate, blood oxygen saturation, HRV variability, blood pressure and
Other bodily fuctions' parameters etc..But the photoelectric sensing of the application scenarios of bio-sensing, human body is often more complicated, main table
The influence of present human motion, human body complexion, human skin tissue, human body impedance etc. to opto-electronic conversion, and vary with each individual,
All ages and classes stage, different time show specificity.Show in circuit design, it is necessary to solve dim light electric signal amplification,
The problems such as signal noise, signal direct current offset, the constant current programmable regulating control of light source, switching control of light source etc., and
Need the regulation for carrying out circuit parameter specific caused by adapt to different human body, different periods etc. in application process.
It is existing to be used to measure heart rate, blood oxygen saturation, HRV variability, blood pressure and other bodily fuctions' parameters etc.
Wearable optical bio sensing device, as shown in figure 1, photoelectric sensing generally comprises light source and detection designing two portions, light source
Control, it is necessary to using digital analog converter (DAC), carries out accurate output voltage programmable regulating by the way of " voltage-controlled constant current "
Control.Photoelectric sensing carries out opto-electronic conversion and then through being converted into voltage signal across resistance amplification using photodiode, it is also necessary to
After filtering with amplifying again, finally carry out analog-digital converter (ADC) and change into data signal, so as to the fortune of following digital circuit
Calculate and handle.The composition of whole system is also needed to comprising microcontroller (Microcontroller), LCD is shown, man-machine interaction is pressed
Button or touch-screen, buzzer warning, bluetooth (Bluetooth) communication, power management, battery electric quantity management etc..
This wearable device is, it is necessary to solve the limitation that significant problem is exactly volume and power consumption, using traditional design
Method design analog front end circuit part, it is necessary first to circuit structure, parameter are designed, including transimpedance amplifier
(TIA) circuit, filter amplification circuit, " voltage-controlled constant current " circuit etc., and the various Primary Components to wherein using carry out type selecting,
Including accurate low noise operational amplifier, ADC converters, DAC etc..The circuit ultimately formed is often due to volume is excessive
Design requirement can not be met, moreover, the excessive actual performance that can also influence photoelectric sensing circuit of volume, it is unnecessary to introduce
Noise and interference.Furthermore the complexity due to human body photoelectric sensing signal and specificity, the debugging efforts ten of analog front end circuit
Divide complicated, it is necessary to according to actual application environment adjustment circuit structure and parameter；And functionally, often can not be comprehensive, both
The design volume of minimum is needed, needs to carry out a variety of switching controls simultaneously again, such as LED multi-path switching and multichannel PD signals
Detection, the difference of sample mode can be sampled or consecutive intervals multiple repairing weld etc. with durations, and existing wearable
Equipment can not meet these requirements.
Utility model content
A purpose of the present utility model is that solve at least the above, and provides the advantages of at least will be described later.
The utility model also has a purpose to be to provide a kind of multichannel photodetection, microminiature integrated form AFE(analog front end) electricity
Road, applied to the microminiature integrated simulation front-end circuit of wearable bio-sensing, adopted for existing photoelectric sensing circuit scheme
The scheme built with discrete analog circuit, digital circuit, the utility model employ integrated form scheme, and detecting function is more complete
Face, the complexity of design is alleviated, add the reliability of circuit, improve convenience and the flexibility of debugging.
In order to realize according to these purposes of the present utility model and further advantage, there is provided a kind of wearable bio signal
Harvester, including：
Photoemission unit, it includes several light emitting diodes, the constant-flow driver being connected and the choosing of light source passage
Select device, each light emitting diode independently drives and luminous intensity, wavelength are different, the light emitting diode respectively with the perseverance
Flow driver connection；
Opto-electronic receiver unit, it comprises at least two-way photodiode, detection channels selector, sampling and change-over switch battle array
Row and analog-digital converter, the optical path length described in per road between photodiode and the light emitting diode is different, the light
Electric diode receives the light signal fed back of the light emitting diode after tissue absorbs, and the photodiode passes through institute
State detection channels selector to be connected with change-over switch array and digital analog converter with sampling successively, the digital analog converter passes through one
Interface module is connected with external controller；
Timing control unit, it is communicated to connect with the interface module, and what the timing control unit included being connected determines
When device and multichannel trigger.
Preferably, the light source channel to channel adapter input is connected with the interface module, and the constant-flow driver is served as reasons
The constant-current source of digital analog converter output voltage control, the light source channel to channel adapter output end and the digital analog converter input
Connection.
Preferably, the front end of each light emitting diode is provided with channel switch, the channel switch and the interface
Module is connected, and the digital analog converter output end is connected by the constant-current source with the channel switch.
Preferably, the photodiode is connected with the detection channels selector input, the detection channels selection
Device output end is provided with the trans-impedance amplifier with adjustable feedback electric capacity, adjustable feedback resistance, the trans-impedance amplifier with it is described
Interface module connects.
Preferably, on the circuit between the detection channels selector output end and the trans-impedance amplifier input still
There is compensation constant biasing adjuster.
Preferably, the trans-impedance amplifier output end is provided with junction filter, and the junction filter is by optional low
Pass filter and high-pass filtering combination are formed, and the junction filter is connected with the interface module.
Preferably, the output end of the junction filter is provided with optional two pole gain amplifier, two pole gain
The output end of amplifier is connected with the sampling with change-over switch array input, two pole gain amplifier and the interface
Module connects.
Preferably, the sampling includes some groups of sampling selecting switch being connected in series and ADC turns with change-over switch array
Change switch, every group of sampling selecting switch is arranged in parallel with ADC change-over switches, every group of sampling selecting switch and ADC change-over switches it
Between be parallel with an electric capacity, the group number of sampling selecting switch and ADC change-over switches than the light emitting diode number more than one, often
Individual sampling selecting switch is connected with the interface module respectively with ADC change-over switches.
Preferably, the sampling and the output end of change-over switch array are connected by a buffer and the analog-digital converter
Connect, and the sampling be arranged in parallel on the output end circuit of change-over switch array one be used for discharge reset switch, it is described multiple
Bit switch is connected with the interface module.
Preferably, the AfD converter output is connected by a First Input First Output with the interface module, described
Interface module is SPI, I2C interface.
The utility model comprises at least following beneficial effect：
1st, the utility model employs analog channel handover scheme, can support multiple detectors so that the utility model
More complicated bio-sensing function can more easily be realized；
2nd, the timer time schedule controller that the utility model uses, can neatly realize LED and photoelectricity
Detector PD various possible timing requirements and sample mode, by configuring the sampling period, configure each LED, PD switch
Initial time and end time, can form the cycle persistently samples, is spaced the modes such as continuous sampling, meets the various of bio-sensing
Sampling request and sampled form；
3rd, by photoemission unit, opto-electronic receiver unit and timing control unit arrangement on one module, will gather
Equipment miniaturization.
Further advantage, target and feature of the present utility model embody part by following explanation, and part will also pass through
Research of the present utility model and practice are understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the system block diagram of existing biological signal collecting device；
Fig. 2 is the system block diagram of the utility model biological signal collecting device；
Fig. 3 is the circuit topology figure of the utility model biological signal collecting device；
Fig. 4 is the circuit diagram of the opto-electronic receiver unit；
Fig. 5 is the SECO figure in a kind of embodiment.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to explanation
Book word can be implemented according to this.
Embodiment one
As shown in Figure 2-5, the utility model provides a kind of wearable biological signal collecting device, by photoemission unit
10th, opto-electronic receiver unit 20 and timing control unit 30, photoemission unit 10 include first luminous two be arranged in parallel
Pole pipe 11, the second light emitting diode 12, the 3rd light emitting diode 13, each light emitting diode independently drives and luminous intensity, ripple
It is long different, according to the needs for gathering different bio signals, to adjust the power of each light emitting diode, such as green glow, feux rouges and indigo plant
Light etc., the front end of the first light emitting diode 11 are provided with first passage switch 111, and the front end of the second light emitting diode 12 is provided with the
Two channel switch 121, the front end of the 3rd light emitting diode 13 are provided with third channel switch 131, and each channel switch is used to control
The break-make of place circuit, the common input end of each light emitting diode are provided with a constant-flow driver, what constant-flow driver used
To connect a light source channel to channel adapter by the input of the constant-current source 16 of the output voltage control of digital analog converter 14, constant-flow driver
15, light source channel to channel adapter 15 is used to select one of LEDs ON.
Opto-electronic receiver unit 20 comprises at least the photodiode that two-way is arranged in parallel：First photodiode 21 and
Two photodiodes 22, photodiode receive the light signal fed back of the light emitting diode after tissue absorbs, two-way light
Electric diode is arranged in parallel the input in detection channels selector 23, and the output end of detection channels selector 23 is provided with one and adopted
Sample and change-over switch array 24, sampling and the output end of change-over switch array 24 are provided with an analog-digital converter 25, digital-to-analogue conversion
Device 25 is connected by an interface module 27 with external controller, and the interface module 27 is SPI/I2C interface control modules, the
The optical path length of one diode 21 and the second photodiode 22 respectively between light emitting diode is different, with data processing
When offset uncertain factor, in practical application, the application scenarios of bio-sensing, the photoelectric sensing of human body are often more complicated, main
The influence of human motion, human body complexion, human skin tissue, human body impedance etc. to opto-electronic conversion is shown, and because of people
And different, all ages and classes stage, different time show specificity, show in circuit design, it is necessary to solve dim light electric signal
The problems such as amplification, signal noise, signal direct current offset, the constant current programmable regulating control of light source, switching control of light source etc., and
And need the regulation for carrying out circuit parameter specific caused by adapt to different human body, different periods etc. in application process,
In the utility model, in order to offset these influences of the specificity to measurement result, by the first photodiode 21 and the second photoelectricity
The asymmetric both sides for being arranged on light emitting diode of diode 22 so that light emitting diode to the first photodiode 21 and the second light
The optical path difference of electric diode 22 is different, influence caused by signal cancellation itself otherness that two photodiodes collect, i.e.,
The correct data of bio signal can be obtained carrying, therefore the applicability of this harvester is stronger.
Timing control unit 30 is connected with interface module 27, and timing control unit 30 includes the timer 31 that is connected and more
Road trigger 32, controller give the SECO order of timing control unit 30 by interface module 27.Interface module is sent out with photoelectricity
Penetrating unit communication control mainly includes：The control of channel selecting, size of current；The control master of interface module and photoelectricity receiving unit
Including：The selection control of channel selecting, multiplication factor, filtering, the amplification of two poles etc., in addition to analog-digital conversion data pass through it is logical
Believe interface output etc.；The main configuration for including time sequence parameter of control of interface module and timing control unit.
Sampling and change-over switch array 24 include four groups of sampling selecting switch being connected in series and ADC change-over switches, every group
Sampling selecting switch is arranged in parallel with ADC change-over switches, and an electricity is parallel between every group of sampling selecting switch and ADC change-over switches
Hold, what is had includes：First choice switchs the 2411, the first ADC change-over switches 2412 and the first electric capacity；Second selecting switch
2421st, the 2nd ADC change-over switches 2422 and the second electric capacity；3rd selecting switch 2431, the 3rd ADC change-over switches 2432 and the 3rd
Electric capacity；4th selecting switch 2441, the 4th ADC change-over switches 2442 and the 4th electric capacity；Each sampling selecting switch is changed with ADC
Output switching terminal is connected with interface module 27 respectively, is controlled by it, and is sampled on the output end circuit with change-over switch array 24
Be arranged in parallel one be used for discharge reset switch 245, reset switch 245 is connected with interface module 27.
When initial, controller sets the triggering sequential of multichannel trigger 32, and controller gives the hair of different light emitting diodes
Luminous power, while the channel conductive sequential of given light source channel to channel adapter 15, meanwhile, controller by interface module 27 respectively with
Light source channel to channel adapter 15, detection channels selector 23, first passage switch 111, second channel switch 121, third channel are opened
Close 131, sampling selecting switch and the connection of ADC change-over switches, light source channel to channel adapter 15, detection channels selector 23, first
Channel switch 111, second channel switch 121, third channel switch 131, sampling selecting switch and ADC change-over switches are by multichannel
The sequential triggering of trigger 32 and act, as shown in figure 5, in the present embodiment, initial time, the in detection channels selector 23
The closure of one switch 231, the first photodiode 21 turn on, and the second switch 232 in detection channels selector 23 closes afterwards, the
Two photodiodes 22 turn on, and in the turn-on cycle of the first photodiode 21 and the second photodiode 22, are touched each
The moment is sent out, order conducting second channel switch 121, third channel switch 131, first passage switch 111, while corresponding control respectively
Conducting route in light source channel to channel adapter 15 processed, given luminous power value is input in constant-flow driver, constant current driving
Device exports constant electric current according to input instruction, drives in corresponding light emitting diode, is lighted, while order conducting the
Two sampling selecting switch the 2421, the 3rd sample selecting switch 2431, first and sample the sampling selection of selecting switch 2411 and the 4th
Switch 2441, while the 4th ADC change-over switches 2442 of order conducting, the 2nd ADC change-over switches 2422, the 3rd ADC change-over switches
2432 and the first ADC change-over switch 2412, each to trigger in the cycle, digital analog converter 25 is all changed, meanwhile, it is each to touch
The moment is sent out, reset switch 245 all carries out reset discharge, realizes the signal at collection current time at this moment, and this moment carries out one
Secondary ADC conversions, need to carry out electric capacity reset discharge before each ADC conversions, be required for so before each ADC conversions
One discharge operation, the ADC of last time is changed with not influenceing this moment, after each period measurement terminates, measure background
Signal, that is to say the background signal that collects when light emitting diode all extinguishes, to calibrate elimination noise, improve measurement accuracy and
Accuracy rate, each photodiode can receive the optical signal of different light emitting diode outputs, output pair within each cycle
The bio signal answered, may finally form the cycle persistently samples, is spaced the modes such as continuous sampling, meets that the various of bio-sensing are adopted
Sample requirement and sampled form.
Embodiment two
On the basis of embodiment one, as shown in figure 3, being provided with constant-current source 16, constant current in the output end of digital analog converter 14
The output end in source 16 is connected with the channel switch of light emitting diode front end, and controller gives the luminous power of each light emitting diode
Data signal, after digital analog converter 14 receives the data signal, export the analog voltage size of corresponding size, simulation electricity
Potential source exports the current source of corresponding size and electric current stabilization by constant-current source 16, light emitting diode corresponding to driving, is emitted light source
Signal is radiated on human body.
Embodiment three
On the basis of embodiment two, as shown in figure 4, the output end of detection channels selector 23 is provided with adjustable feedback
Electric capacity CF, adjustable feedback resistance RFTrans-impedance amplifier 28, according to design requirement, controller can adjust adjustable feedback electric capacity CF、
Adjustable feedback resistance RFValue, and the multiplication factor of trans-impedance amplifier 28, to meet the needs of signal transacting, two channel selectings
Still there is compensation constant biasing adjuster 281 on circuit between the output end of device 23 and the input of trans-impedance amplifier 28, to adjust
Whole photodiode receives the DC component of AC signal, direct current biasing, improves the precision of signal transacting.
Example IV
On the basis of embodiment three, as shown in figure 4, the output end of trans-impedance amplifier 28 is provided with junction filter 29, should
Junction filter 29 is made up of optional LPF 291 and the combination of high-pass filtering 292, and junction filter connects with interface module 27
Connect, can arrange in pairs or groups composition bandpass filter, bandstop filter, notch filter etc..The output end of junction filter 29 is provided with
Optional two pole gain amplifier 293, to the amplification again of signal, multiplication factor is adjusted by adjusting resistance, two poles increase
Beneficial amplifier 293 can select to access circuit or bypass, while the output of two pole gain amplifiers 293 by a switch bypass
End is connected with sampling with the input of change-over switch array 24, and two pole gain amplifiers are connected with interface module, is amplified for controlling
Multiple and whether access.
Sampling is connected with the output end of change-over switch array 24 by a buffer 246 with analog-digital converter 25, and reset is opened
Close 245 to be connected on sampling and the circuit between change-over switch array 24 and buffer 246, AfD converter output passes through one
First Input First Output 26 is connected with interface module 27, and interface module 27 is connected with controller, and each controlled cell is arrived in distribution instruction
On.
From the above mentioned, system design block diagram of the present utility model is illustrated in fig. 2 shown below, and two-way photodiode (PD) is by can
Photodiode (the PD of analog switch (MUX selectors) the selection input of control switchingA、PDB) passage, the pole of passage photoelectricity two
The electric current of pipe collection is converted into voltage by transimpedance amplifier (TIA).Difference for PD equivalent parasitic capacitances, it is input to PD
The difference of light intensity, using optional feedback capacity (CF) PD parasitic capacitance is compensated, optional feedback resistance (RF) change
TIA multiplication factor.Pass through optional second order Butterworth filter (Filter), including LPF (LPF), high-pass filtering
(HPF), bandpass filtering (BPF), notch filter (Notch Filter) etc., pass through optional two pole gain amplifier (Stage2-
Gain secondary amplification) is carried out, and is digitized using analog-digital converter (ADC), using First Input First Output (FIFO) to adopting
Sample ADC values carry out buffer-stored, in order to the reading of I2C or SPI interface module etc..The utility model is also included based on digitlization
The integrated LED driver of the constant current control of digital analog converter (DAC), the constant current for the LED of a variety of different wave lengths is adjustable
Control, and include LED driver.The utility model also includes SPI, I2C control interface module, for PERCOM peripheral communication, in configuration
The register in portion, including feedback capacity (CF), feedback resistance (RF) configuration；Bias the configuration of constant current size；Hardware filter
Configuration and selection；The configuration and selection of two pole gains；The configuration of timer control unit sequential register.
It the utility model is related to a kind of for wearable optical monitoring, the microminiature integrated simulation front end electricity of bio-sensing
Road designs and realized that the utility model is directed to current wearable application, towards optical bio sensing technology, devises a kind of more logical
Road photodetection, microminiature integrated form analog front circuit.The utility model devises a kind of support multiple (three) luminous two
Pole pipe (LED), two photodiodes (PhotoDiode), before the microminiature integrated simulation of wearable bio-sensing
Terminal circuit, including analog channel switching (MUX), transimpedance amplifier (TIA), constant biasing regulation (Offset DAC),
Wave filter (BPF), two pole gain amplifiers (Gain of Stage 2), the ADC converters with Buffer bufferings, FIFO
Fifo queue, SPI/I2C interface control modules, LED " voltage-controlled constant current " module with DAC, timer time-sequence control module
(Timing Controller) etc..Built for existing photoelectric sensing circuit scheme using discrete analog circuit, digital circuit
Scheme, the utility model employs integrated form scheme, full-featured, alleviates the complexity of design, adds the reliable of circuit
Property, improve convenience and the flexibility of debugging.
The utility model employs analog channel handover scheme, can support multiple detectors so that the utility model can
More easily to realize more complicated bio-sensing function；The timer time schedule controller that the utility model uses, can be with
LED and the various possible timing requirements and sample mode of photoelectric detector PD are neatly realized, passes through and configures
In the sampling period, initial time and the end time of each LED, PD switch are configured, can form the cycle persistently samples, be spaced continuously
The modes such as sampling, meet the various sampling requests and sampled form of bio-sensing.
Timer time-sequence control module used by the utility model, mainly include timer and multicircuit time trigger,
Timer provides unified timer clock for multicircuit time trigger, according to the time set per clocked flip-flop all the way, to touch
Switch, sampling switch and ADC change-over switches array, ADC reset switches, LED channel in hair photodetection selector (MUX) are opened
Close etc., can be in a timing cycle according to different sequential combinations, timesharing carries out double detector, LED multi-path passage,
The switching control of light source, the acquisition control with detector.Pass through SPI, I2C interface, in that context it may be convenient to the ginseng of each ADC conversions
Number is set respectively, including the setting of LED current size, TIA amplification are set, filtering is set, two pole gain amplifications are set
Etc..
By configuring the timing of multichannel clocked flip-flop, binary channels, more LED, cycle continuous acquisition time are realized.
It is illustrated in fig. 4 shown below, is in signal period, multichannel timer SECO configuration realizes timing diagram with acquisition time.At one
In sampling period, detector includes opening and closing two kinds of actions, two-way detector, is separately turned in the different periods.At certain
In the half period that detector is opened all the way, it is divided into 4 parts again, 1/8 cycle.In half period, distinguished by 1/8 cycle
Switch, the sampling switch of LED channel are selected, to carry out the sampling of multi-channel LED.Using pipeline work, each passage
ADC conversions need to postpone 1/8 cycle, and carry out the sampling in next 1/8 cycle simultaneously, current channel carries out ADC samplings
When, while a passage ADC conversion is carried out, form sampled result., it is necessary to answer ADC before ADC conversions each time
Position, remove last sampling residual voltage.
The utility model employs analog channel handover scheme, can support multiple detectors so that the utility model can
More easily to realize more complicated bio-sensing function；Meanwhile the timer time schedule controller that the utility model uses,
LED and the various possible timing requirements and sample mode of photoelectric detector PD can be neatly realized, is passed through
The sampling period is configured, configures initial time and the end time of each LED, PD switch, can form the cycle persistently samples, is spaced
The modes such as continuous sampling, meet the various sampling requests and sampled form of bio-sensing；And photoemission unit, photoelectricity are connect
Receive unit and timing control unit arrangement on one module, harvester is minimized.
Although embodiment of the present utility model is disclosed as above, it is not restricted in specification and embodiment
Listed utilization, it can be applied to various suitable fields of the present utility model completely, for those skilled in the art,
Other modification is easily achieved, therefore under the universal limited without departing substantially from claim and equivalency range, this reality
Specific details is not limited to new and shown here as the legend with description.
Claims (10)
- A kind of 1. wearable biological signal collecting device, it is characterised in that including：Photoemission unit, it includes several light emitting diodes, the constant-flow driver being connected and light source channel to channel adapter, Each light emitting diode independently drives and luminous intensity, wavelength are different, and the light emitting diode drives with the constant current respectively Dynamic device connection；Opto-electronic receiver unit, its comprise at least two-way photodiode, detection channels selector, sampling and change-over switch array with And analog-digital converter, the optical path length described in per road between photodiode and the light emitting diode is different, the photoelectricity two Pole pipe receives the light signal fed back of the light emitting diode after tissue absorbs, and the photodiode passes through the spy Survey channel to channel adapter to be connected with change-over switch array and digital analog converter with sampling successively, the digital analog converter passes through an interface Module is connected with external controller；Timing control unit, it is communicated to connect with the interface module, and the timing control unit includes the timer being connected With multichannel trigger.
- 2. wearable biological signal collecting device as claimed in claim 1, it is characterised in that the light source channel to channel adapter Input is connected with the interface module, and the constant-flow driver is by the constant-current source of digital analog converter output voltage control, institute Light source channel to channel adapter output end is stated to be connected with the digital analog converter input.
- 3. wearable biological signal collecting device as claimed in claim 2, it is characterised in that each light emitting diode Front end be provided with channel switch, the channel switch is connected with the interface module, and the digital analog converter output end passes through The constant-current source is connected with the channel switch.
- 4. wearable biological signal collecting device as claimed in claim 3, it is characterised in that the photodiode and institute State detection channels selector input connection, the detection channels selector output end be provided with adjustable feedback electric capacity, can The trans-impedance amplifier of feedback resistance is adjusted, the trans-impedance amplifier is connected with the interface module.
- 5. wearable biological signal collecting device as claimed in claim 4, it is characterised in that the detection channels selector Still there is compensation constant biasing adjuster on circuit between output end and the trans-impedance amplifier input.
- 6. wearable biological signal collecting device as claimed in claim 5, it is characterised in that the trans-impedance amplifier output End is provided with junction filter, and the junction filter is combined by optional LPF and high-pass filtering and formed, the combination Wave filter is connected with the interface module.
- 7. wearable biological signal collecting device as claimed in claim 6, it is characterised in that the junction filter it is defeated Go out end and be provided with optional two pole gain amplifier, output end and the sampling and the change-over switch of two pole gain amplifier Array input is connected, and two pole gain amplifier is connected with the interface module.
- 8. wearable biological signal collecting device as claimed in claim 7, it is characterised in that the sampling and change-over switch Array includes some groups of sampling selecting switch being connected in series and ADC change-over switches, and every group of sampling selecting switch is opened with ADC conversions Pass is arranged in parallel, and an electric capacity is parallel between every group of sampling selecting switch and ADC change-over switches, and sampling selecting switch turns with ADC Change the group number of switch than the light emitting diode number more than one, it is each sample selecting switch and ADC change-over switches respectively with The interface module connection.
- 9. wearable biological signal collecting device as claimed in claim 8, it is characterised in that the sampling and change-over switch The output end of array is connected by a buffer with the analog-digital converter, and the sampling and the output end of change-over switch array Be arranged in parallel on circuit one be used for discharge reset switch, the reset switch is connected with the interface module.
- 10. wearable biological signal collecting device as claimed in claim 9, it is characterised in that the analog-digital converter is defeated Go out end to be connected with the interface module by a First Input First Output, the interface module is SPI, I2C interface.
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| CN201621419577.7U CN206777308U (en) | 2016-12-22 | 2016-12-22 | Wearable biological signal collecting device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106725323A (en) * | 2016-12-22 | 2017-05-31 | 中国科学院苏州生物医学工程技术研究所 | Wearable biological signal collecting device |
| CN112294265A (en) * | 2020-11-03 | 2021-02-02 | 珠海中科先进技术研究院有限公司 | Vein display device and method for assisting tail vein injection of animal |
| CN114705736A (en) * | 2022-03-21 | 2022-07-05 | 山东大学 | Portable multi-channel detection electrochemical sensing system and application thereof |
-
2016
- 2016-12-22 CN CN201621419577.7U patent/CN206777308U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106725323A (en) * | 2016-12-22 | 2017-05-31 | 中国科学院苏州生物医学工程技术研究所 | Wearable biological signal collecting device |
| CN112294265A (en) * | 2020-11-03 | 2021-02-02 | 珠海中科先进技术研究院有限公司 | Vein display device and method for assisting tail vein injection of animal |
| CN114705736A (en) * | 2022-03-21 | 2022-07-05 | 山东大学 | Portable multi-channel detection electrochemical sensing system and application thereof |
| CN114705736B (en) * | 2022-03-21 | 2023-08-11 | 山东大学 | Portable multi-channel detection electrochemical sensing system and application thereof |
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