CN110338783A - A kind of ECG signal Acquisition Circuit of super low-power consumption - Google Patents
A kind of ECG signal Acquisition Circuit of super low-power consumption Download PDFInfo
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- CN110338783A CN110338783A CN201910683761.4A CN201910683761A CN110338783A CN 110338783 A CN110338783 A CN 110338783A CN 201910683761 A CN201910683761 A CN 201910683761A CN 110338783 A CN110338783 A CN 110338783A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
- A61B5/30—Input circuits therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7235—Details of waveform analysis
- A61B5/725—Details of waveform analysis using specific filters therefor, e.g. Kalman or adaptive filters
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Abstract
A kind of ECG signal Acquisition Circuit of super low-power consumption, comprising: ECG signal front-end collection unit, for the body electrical signals of acquisition to be passed to instrument amplifier circuit；Instrument amplifier circuit is input to level-one instrument amplifier IA amplification for signal acquisition unit to be transmitted the difference mode signal come；High pass filter unit, for separating direct current and eliminating baseline drift；Integral amplifier AI feed circuit, the electric current for inputting to instrument amplifier circuit, which provides, to be biased and carries out integral offset compensation to operational amplifier OA；Operational amplifier OA amplifying circuit, the electric signal for transmitting to integrating circuit carry out low-pass filtering and proportionally amplify；Signal output unit acquires ECG signal using ADC as desired.The configuration of the present invention is simple, it is easy to accomplish, it can easily acquire physiology signal.
Description
Technical field
The present invention relates to ECG signal field more particularly to a kind of ECG signal Acquisition Circuits of super low-power consumption.
Background technique
Currently, many threats the safety of human health and life, and most of disease requires electrocardiogram to the heart
It is dirty to be diagnosed.Traditional electrocardiogram is mainly defeated by high-pass filtering circuit, 50Hz trap circuit, low-pass filter circuit and main amplification
The deficiencies of circuit forms out, this mode circuit is complicated, reliability is low, and power consumption is high, is not easy to manufacture and safeguard, and is at high cost
It is high, it is not easy to safeguard.
Summary of the invention
It is an object of the present invention in view of the above-mentioned problems, propose a kind of ECG signal Acquisition Circuit of super low-power consumption.
A kind of ECG signal Acquisition Circuit of super low-power consumption, comprising:
ECG signal front-end collection unit, including first electrode and second electrode become for acquiring the cardiac muscle that human body changes over time
The current potential electric potential signal of change, while the signal of acquisition is passed into instrument amplifier circuit；
Instrument amplifier circuit, the difference mode signal for transmitting signal acquisition unit are input to level-one instrument amplifier IA and put
Greatly, while common mode interference signal is eliminated；
High pass filter unit, for separating direct current and eliminating baseline drift；
Integrating circuit, the electric current that integral negative-feedback circuit is used to input instrument amplifier circuit, which provides, to be biased and puts to operation
Big device OA carries out integral offset compensation；
Operation amplifier circuit, the electric signal for transmitting to integrating circuit carry out low-pass filtering and proportionally amplify.
The first electrode and second electrode are changed using the alloy material of low potential fluctuation and low drifting for cardiac muscle
The conduction of current potential electric potential signal.
The instrument amplifier circuit includes:
Instrument amplifier IA eliminates common mode interference signal for amplifying difference mode signal；Set on first electrode and instrument amplifier
The R1 of reverse input end；Set on the R2 of second electrode and instrument amplifier noninverting input；With operational amplifier forward direction output end
Connected R3, R4.
The high pass filter unit is configured as being made of capacitor C1 and resistance R5, is set to instrument amplifier output end and fortune
It calculates between amplifier OA, for separating direct current signal and eliminating the shifted signal of biological baseline.
The integrating circuit includes: integral amplifier AI and capacitor C2 and resistance R6, the output of the integral amplifier AI
End is connected with the end instrument amplifier REF, and the negative input of integral amplifier AI is defeated by R5, R6 and operational amplifier OA negative sense
Enter end to be connected, for providing bias reference to IA instrument amplifier in negative feedback control and carrying out integral mistake to operational amplifier OA
Adjust compensation；The capacitor C2 and resistance R6 constitutes integrating circuit.
The operation amplifier circuit includes: operational amplification circuit OA, resistance R7, R8 and capacitor C3；The operation amplifier
Circuit OA positive input connects R3, R4, is supplied to operational amplifier positive input as ginseng for ECG signal as benchmark
Signal is examined, operational amplification circuit OA negative input connects the R6 of high-pass filtering and integrating amplification circuit negative input, integral
Amplifying circuit carries out integral offset compensation to operational amplifier OA negative input；Ratio of the resistance R8 to resistance R7 resistance value
For signal proportionally to be amplified；Integrating capacitor C3 and resistance R7, the integrating capacitor C3 and resistance R7 in parallel is used for structure
At low-pass filter.
The low-pass cut-off frequencies f of the operation amplifier circuitL=1/2πR7C3；
The closed loop 3dB turnover dot frequency f of the operation amplifier circuit3dB=1/2πR7C3；
The gain A of the operation amplifier circuitL=R8/R7。
Beneficial effects of the present invention: physiology signal is acquired by signal acquisition unit, passes through instrument amplifier circuit
Differential mode circuit is amplified, negative-feedback circuit is controlled by integrating circuit, electric signal is put by operational amplifier
Greatly, and by the signal of amplification the rhythm of the heart information that external equipment is needed is passed to.By the circuit, rhythm of the heart information may be implemented
Acquisition, while structure is simple, easy to accomplish.
Detailed description of the invention
Fig. 1 is ecg circuit structure chart.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.
In the present embodiment, as shown in Figure 1, a kind of ECG signal Acquisition Circuit of super low-power consumption, comprising:
ECG signal front-end collection unit simultaneously will for acquiring the current potential electric potential signal for the cardiac muscle variation that human body changes over time
The signal of acquisition passes to instrument amplifier circuit；Instrument amplifier circuit, for signal acquisition unit to be transmitted the differential mode come
Signal is input to level-one instrument amplifier IA amplification, while eliminating common mode interference signal；High pass filter unit, for separating direct current
With elimination baseline drift；Integrating circuit, the electric current that integral negative-feedback circuit is used to input instrument amplifier circuit provide biasing
And integral offset compensation is carried out to operational amplifier OA；Operation amplifier circuit, electric signal for being transmitted to integrating circuit into
Row low-pass filtering and proportionally amplify；Signal output unit acquires ECG signal using ADC as desired.
Further, the ECG signal front-end collection unit is configured as:
The alloy material of first electrode and second electrode using low potential fluctuation and low drifting, the current potential potential changed for cardiac muscle
Signal transduction；
The ECG signal front-end collection unit, the current potential electric potential signal for the cardiac muscle variation that the human body for acquisition changes over time.
Further, the instrument amplifier circuit includes:
Instrument amplifier IA eliminates common mode interference signal for amplifying difference mode signal；
Set on the R1 of first electrode and instrument amplifier reverse input end；
Set on the R2 of second electrode and instrument amplifier noninverting input；
R3, the R4 being connected with operational amplifier forward direction output end.
Set on the R1 of first electrode and instrument amplifier reverse input end, it is set to second electrode and instrument amplifier is defeated in the same direction
The R2 for entering end, when first electrode and second electrode contact simultaneously, by ECG signal front-end collection unit by the electric signal of acquisition
Instrument amplifier is passed to, instrument amplifier amplifies electric signal according to a certain percentage, the one end R4 and second electrode and instrument
The forward end of amplifier is connected, and one end is connected with the forward end of operational amplifier；R3 is set to first electrode and operational amplifier
Forward end.
Further, the high pass filter unit is configured as being made of capacitor C1 and resistance R5, is set to instrument amplifier
Between output end and operational amplifier OA, for separating direct current signal and eliminating the shifted signal of biological baseline.
Further, the integrating circuit is configured as:
The output end of integrating amplification circuit AI is connected with the end instrument amplifier REF,
The negative input of integrating circuit AI is connected by R5, R6 with operational amplifier OA negative input simultaneously,
It is mended for providing bias reference to IA instrument amplifier in negative feedback control and carrying out integral imbalance to operational amplifier OA
It repays, capacitor C2 and resistance R6 constitute integrating circuit.
Further, the operation amplifier circuit is configured as:
Operational amplification circuit OA positive input connects R3, R4, is supplied to operational amplifier forward direction for ECG signal as benchmark
For input terminal as reference signal, operational amplification circuit OA negative input connects high-pass filtering and the input of integrating amplification circuit negative sense
The R6 at end, integrating amplification circuit carry out integral offset compensation, ratio of the R8 to R7 resistance value to operational amplifier OA negative input
For signal proportionally to be amplified；
Integrating capacitor C3 and resistance R7, the integrating capacitor C3 and resistance R7 in parallel is for constituting filter.
Further, the signal element further includes ADC, for the analog signal of acquisition to be converted to digital signal, is used
In the precise acquisition to ECG information.
Further, operational amplifier ground calculating process:
Low-pass cut-off frequencies: fL=1/2πR7C3；
Closed loop 3dB turnover dot frequency: f3dB=1/2πR7C3；
Gain: AL=R8/R7。
The present invention amplifies by instrument amplifier IA, provides biasing by integrating circuit AI, carries out in negative feedback control
Integrate offset compensation operation amplifier；Finally signal amplification is carried out in three-stage operational amplifier OA proportionally to amplify.Finally by
The sample frequency and sampling precision acquisition ECG signal of external ADC as desired, the configuration of the present invention is simple, it is easy to accomplish, facilitate dimension
Shield.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (9)
1. a kind of ECG signal Acquisition Circuit of super low-power consumption characterized by comprising
ECG signal front-end collection unit, including first electrode and second electrode become for acquiring the cardiac muscle that human body changes over time
The current potential electric potential signal of change, while the signal of acquisition is passed into instrument amplifier circuit；
Instrument amplifier circuit, the difference mode signal for transmitting signal acquisition unit are input to level-one instrument amplifier IA and put
Greatly, while common mode interference signal is eliminated；
High pass filter unit, for separating direct current and eliminating baseline drift；
Integrating circuit, the electric current that integral negative-feedback circuit is used to input instrument amplifier circuit, which provides, to be biased and puts to operation
Big device OA carries out integral offset compensation；
Operation amplifier circuit, the electric signal for transmitting to integrating circuit carry out low-pass filtering and proportionally amplify.
2. a kind of ECG signal Acquisition Circuit of super low-power consumption according to claim 1, which is characterized in that the ECG signal
Front-end collection unit includes:
The alloy material of the first electrode and second electrode using low potential fluctuation and low drifting, the current potential changed for cardiac muscle
Electric potential signal conduction.
3. a kind of ECG signal Acquisition Circuit of super low-power consumption according to claim 1, which is characterized in that the instrument is put
Big device circuit includes:
Instrument amplifier IA eliminates common mode interference signal for amplifying difference mode signal；
Set on the R1 of first electrode and instrument amplifier reverse input end；
Set on the R2 of second electrode and instrument amplifier noninverting input；
R3, the R4 being connected with operational amplifier forward direction output end.
4. a kind of ECG signal Acquisition Circuit of super low-power consumption according to claim 1, which is characterized in that the high pass filter
Wave unit is configured as being made of capacitor C1 and resistance R5, is set between instrument amplifier output end and operational amplifier OA, uses
In the shifted signal of partition direct current signal and the biological baseline of elimination.
5. a kind of ECG signal Acquisition Circuit for the super low-power consumption stated according to claim 1, which is characterized in that the integrating circuit
Include:
Integral amplifier AI and capacitor C2 and resistance R6,
The output end of the integral amplifier AI is connected with the end instrument amplifier REF,
The negative input of integral amplifier AI is connected by R5, R6 with operational amplifier OA negative input, and negative-feedback is used for
Bias reference is provided to IA instrument amplifier in control and integral offset compensation is carried out to operational amplifier OA；
The capacitor C2 and resistance R6 constitutes integrating circuit.
6. a kind of ECG signal Acquisition Circuit for the super low-power consumption stated according to claim 1, which is characterized in that the operation amplifier
Device circuit includes:
Operational amplification circuit OA, resistance R7, R8 and capacitor C3；
The operational amplification circuit OA positive input connects R3, R4, is supplied to operational amplifier for ECG signal as benchmark
Positive input connects high-pass filtering and integrating amplification circuit negative sense as reference signal, operational amplification circuit OA negative input
The R6 of input terminal, integrating amplification circuit carry out integral offset compensation to operational amplifier OA negative input；
The resistance R8 is used to proportionally amplify signal to the ratio of resistance R7 resistance value；
Integrating capacitor C3 and resistance R7, the integrating capacitor C3 and resistance R7 in parallel is for constituting low-pass filter.
7. a kind of ECG signal Acquisition Circuit for the super low-power consumption stated according to claim 1, which is characterized in that the operation amplifier
The low-pass cut-off frequencies f of device circuitL=1/2πR7C3。
8. a kind of ECG signal Acquisition Circuit for the super low-power consumption stated according to claim 1, which is characterized in that the operation amplifier
The closed loop 3dB turnover dot frequency f of device circuit3dB=1/2πR7C3。
9. a kind of ECG signal Acquisition Circuit for the super low-power consumption stated according to claim 1, which is characterized in that the operation amplifier
The gain A of device circuitL=R8/R7。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910683761.4A CN110338783A (en) | 2019-07-26 | 2019-07-26 | A kind of ECG signal Acquisition Circuit of super low-power consumption |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910683761.4A CN110338783A (en) | 2019-07-26 | 2019-07-26 | A kind of ECG signal Acquisition Circuit of super low-power consumption |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022166181A1 (en) * | 2021-02-02 | 2022-08-11 | 武汉联影智融医疗科技有限公司 | Human body signal collection apparatus |
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Application publication date: 20191018 |
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