CN108309280A - The signal intensifier circuit of electrocardiograph - Google Patents
The signal intensifier circuit of electrocardiograph Download PDFInfo
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- CN108309280A CN108309280A CN201810143196.8A CN201810143196A CN108309280A CN 108309280 A CN108309280 A CN 108309280A CN 201810143196 A CN201810143196 A CN 201810143196A CN 108309280 A CN108309280 A CN 108309280A
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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
- A61B5/316—Modalities, i.e. specific diagnostic methods
- A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
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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
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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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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- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The invention discloses the signal intensifier circuits of electrocardiograph,Including anti-jamming circuit,Difference adjusts circuit and feedback enhancing circuit,The anti-jamming circuit receives the electric potential signal that electrocardiogram machine lead wire transmits,With inductance L1,L2 and capacitance C3 composition filter circuits enter difference adjusting circuit after filtering out unwanted noise signal,Improve the precision that electrode potential signal is extracted from interfering noise signal and electrode potential signal,And the amplitude of signal is subjected to primary amplification,In the circuit of input feedback enhancing later,Pass through unijunction transistor Q1,Triode Q2 and slide rheostat RW2 composition composite amplifier amplification difference adjust the amplitude of the voltage signal of circuit output,Keep electrocardiograph apparent,The state of the heart of human body is more accurately displayed out,The signal fed back simultaneously with transport and placing device AR4,It controls the angle of flow of unijunction transistor Q1 and then controls the precision of the amplitude of amplified signal,In the control terminal of the signal input electrocardiograph of finally feedback enhancing circuit output.
Description
Technical field
The present invention relates to electrocardiograph technical fields, more particularly to the signal intensifier circuit of electrocardiograph.
Background technology
Electrocardiograph can automatically record the bioelectrical signals (electrocardiosignal) that myocardial activation when cardiomotility generates,
For clinical diagnosis and the common medical electronics of scientific research.
Before beating, excitement occurs heart first for cardiac muscle, weak current is generated in excited process, the electric current is through human body
It organizes to conduct to each section.Since the tissue of body parts is different, each section between heart at a distance from it is different, therefore in human body
Each position of body surface, shows different potential changes, surface potential and time caused by electrical activity in this human heart
Relationship is known as electrocardiogram, and electrocardiograph is then the instrument for recording these electro-physiological signals, in order to keep electrocardiograph apparent, more accurate
The state for really showing the heart of human body needs that electric potential signal is made to enhance, and on the basis of improving signal accuracy, can
Stable transmission.
So the present invention provides a kind of new scheme to solve the problems, such as this.
Invention content
For the above situation, to overcome the defect of the prior art, purpose of the present invention is to provide the signals of electrocardiograph
Enhance circuit, have be skillfully constructed, the characteristic of human oriented design, effectively enhance the signal of electrocardiograph, and believe improving
On the basis of number accuracy, the transmission that can stablize.
Its technical solution solved is the signal intensifier circuit of electrocardiograph, including anti-jamming circuit, difference adjust circuit
Enhancing circuit with feedback, which is characterized in that the anti-jamming circuit receives the electric potential signal that electrocardiogram machine lead wire transmits,
Unwanted noise signal is filtered out with inductance L1, L2 and capacitance C3 composition filter circuits, it is anti-interference that the difference adjusts circuit reception
Circuit output signal is carried out with transport and placing device AR1, transport and placing device AR2 and transport and placing device AR3 composition compound circuits at differential balance amplification
After reason in input feedback enhancing circuit, the feedback enhancing circuit uses unijunction transistor Q1, triode Q2 and slide rheostat
RW2 forms composite amplifier, while the signal fed back with transport and placing device AR4, controls composite amplifier amplified signal
Amplitude；
The feedback enhancing circuit includes unijunction transistor Q1, one end of the emitter connecting resistance R10 of unijunction transistor Q1 and electricity
Hold one end of C1, the base stage B1 connecting resistances R11 of unijunction transistor Q1, one end of capacitance C5, the base stage B2 of unijunction transistor Q1 connects
The pin 1 of slide rheostat RW2, another terminating resistor R12 of capacitance C5, one end and triode Q2 of resistance R14 base stage, three
The collector connecting resistance R15 of pole pipe Q2, one end of capacitance C2, the emitter connecting resistance R16 of triode Q2, one end of capacitance C4,
Another termination signal output port and resistance of another termination power+5V of resistance R11, resistance R12 and resistance R15, capacitance C2
One end of R18 and the other end of capacitance C6, one end of another terminating resistor R17 of resistance R18 and transport and placing device AR4's is same mutually defeated
Enter end, the other end ground connection of the inverting input of transport and placing device AR4 and capacitance C6, the output end of transport and placing device AR4 and resistance R17's is another
One end of one terminating resistor R13, the emitter of the other end order junction transistors Q1 of resistance R13, the pin of slide rheostat RW2
3, the other end, the electricity of the pin 2 of slide rheostat RW2, the other end of resistance R10, the other end of resistance R14 and resistance R16
Hold the other end ground connection of C4.
Due to the use of above technical scheme, the present invention has the following advantages that compared with prior art；
1, anti-jamming circuit receives the electric potential signal that electrocardiogram machine lead wire transmits, with inductance L1, L2 and capacitance C3 groups
Unwanted noise signal is filtered out at filter circuit, enters difference later and adjusts circuit, with transport and placing device AR1, transport and placing device AR2 and amplifier
Device AR3 composition compound circuits carry out differential balance enhanced processing, and two electric potential signals of input are converted to voltage signal, with
This improves the precision that electrode potential signal is extracted from interfering noise signal and electrode potential signal, and the amplitude of signal is carried out
Primary is amplified, and in the circuit of input feedback enhancing later, passes through unijunction transistor Q1, triode Q2 and slide rheostat RW2 compositions
Composite amplifier amplifies the amplitude that difference adjusts the voltage signal of circuit output, makes that electrocardiograph is apparent, more accurately shows
The state of the heart of human body, while the signal fed back with transport and placing device AR4, the angle of flow of control unijunction transistor Q1 are shown
And then the precision of the amplitude of amplified signal is controlled, the signal of electrocardiograph is effectively enhanced, and improving signal accuracy
On the basis of, the transmission that can stablize.
2, composite amplifier is formed by unijunction transistor Q1, triode Q2 and slide rheostat RW2 and amplifies difference tune
Save circuit output voltage signal amplitude, make electrocardiograph is apparent, be more accurately displayed out human body heart state, together
The signal that Shi Yunyong transport and placing devices AR4 is fed back, the angle of flow of control unijunction transistor Q1 and then the amplitude for controlling amplified signal
Precision.
Description of the drawings
Fig. 1 is the module map of the signal intensifier circuit of electrocardiograph of the present invention.
Fig. 2 is the schematic diagram of the signal intensifier circuit of electrocardiograph of the present invention.
Specific implementation mode
For the present invention aforementioned and other technology contents, feature and effect, in following cooperation with reference to figures 1 through attached drawing 2
To in the detailed description of embodiment, can clearly present.The structure content being previously mentioned in following embodiment is with specification
Attached drawing is reference.
Embodiment one, the signal intensifier circuit of electrocardiograph, including anti-jamming circuit, difference adjust circuit and feedback enhancing
Circuit, the anti-jamming circuit receives the electric potential signal that electrocardiogram machine lead wire transmits, with inductance L1, L2 and capacitance C3
Composition filter circuit filters out unwanted noise signal（Filter out the radio frequency of the AC power interference and miscellaneous equipment powered for electrocardiograph
Interference）, enter difference later and adjust circuit, carried out with transport and placing device AR1, transport and placing device AR2 and transport and placing device AR3 composition compound circuits
Differential balance enhanced processing, and two electric potential signals of input are converted into voltage signal, it is improved from interfering noise signal with this
With the precision for extracting electrode potential signal in electrode potential signal, and the amplitude of signal is subjected to primary amplification, input is anti-later
In feedback enhancing circuit, composite amplifier is formed by unijunction transistor Q1, triode Q2 and slide rheostat RW2 and amplifies difference
Adjust circuit output voltage signal amplitude, make electrocardiograph is apparent, be more accurately displayed out human body heart state,
The signal fed back simultaneously with transport and placing device AR4, the angle of flow of control unijunction transistor Q1 and then the width for controlling amplified signal
The signal of the precision of degree, finally feedback enhancing circuit output inputs in the control terminal of electrocardiograph；
The feedback enhancing circuit is used to form compound amplification by unijunction transistor Q1, triode Q2 and slide rheostat RW2
Circuit amplifies the amplitude that difference adjusts the voltage signal of circuit output, makes that electrocardiograph is apparent, human body is more accurately displayed out
Heart state, while the signal fed back with transport and placing device AR4 the angle of flow of control unijunction transistor Q1 and then controls
The precision of the amplitude of amplified signal, including unijunction transistor Q1, one end of the emitter connecting resistance R10 of unijunction transistor Q1 and electricity
Hold one end of C1, the base stage B1 connecting resistances R11 of unijunction transistor Q1, one end of capacitance C5, the base stage B2 of unijunction transistor Q1 connects
The pin 1 of slide rheostat RW2, another terminating resistor R12 of capacitance C5, one end and triode Q2 of resistance R14 base stage, three
The collector connecting resistance R15 of pole pipe Q2, one end of capacitance C2, the emitter connecting resistance R16 of triode Q2, one end of capacitance C4,
Another termination signal output port and resistance of another termination power+5V of resistance R11, resistance R12 and resistance R15, capacitance C2
One end of R18 and the other end of capacitance C6, one end of another terminating resistor R17 of resistance R18 and transport and placing device AR4's is same mutually defeated
Enter end, the other end ground connection of the inverting input of transport and placing device AR4 and capacitance C6, the output end of transport and placing device AR4 and resistance R17's is another
One end of one terminating resistor R13, the pin 3 of another termination slide rheostat RW2 of resistance R13, the pin of slide rheostat RW2
The other end ground connection of the other end of 2 and resistance R10, the other end of the other end of resistance R14 and resistance R16, capacitance C4, unijunction
Transistor Q1, resistance R10, resistance R11, capacitance C1 form trigger circuit, and the voltage signal of circuit output is adjusted according to difference
The angle of flow of the Signal Regulation unijunction transistor Q1 fed back with transport and placing device AR4 generates electrocardio pulse signal with this, after pass through
Capacitance C5 enters the amplifying circuit that triode Q2 is core, and electrocardio pulse signal, which is amplified, to be enhanced, finally by the collection of triode Q2
Electrode is output to signal output end through capacitance C2.
Embodiment two, on the basis of embodiment one, the difference adjusts circuit and is used for being exported through anti-jamming circuit
Electric potential signal carries out differential balance enhanced processing, and electric potential signal is made not influenced to be amplified to late-class circuit biography by common mode interference
It is defeated, including constitute differential amplification with transport and placing device AR1, transport and placing device AR2 and transport and placing device AR3, wherein transport and placing device AR1, transport and placing device AR2
Device, circuit structure is symmetrical, other than with high input impedance, also has very high common mode rejection performance, the reverse phase of transport and placing device AR1
The electric potential signal that input terminal is exported by resistance R1 one electrode of connection, the in-phase input end of transport and placing device AR2 are connected by resistance R2
The electric potential signal of electrode output is connect, the in-phase input end of transport and placing device AR1 is separately connected one end of resistance R6, potentiometer RW1
Lower end, the other end of resistance R6 is separately connected one end of the output end of transport and placing device AR1, resistance R7, the other end point of resistance R7
Not Lian Jie the in-phase input end of transport and placing device AR3, resistance R8 one end, the other end connection ground of resistance R8, the reverse phase of transport and placing device AR2
Input terminal is separately connected one end of resistance R4, the upper end of potentiometer RW1 and adjustable end, the other end of resistance R4 and is separately connected amplifier
The output end of device AR2, one end of resistance R3, the output voltage of transport and placing device AR1=（1+ resistance R6/potentiometer RW1）Multiply in amplifier
The in-phase input end electric potential signal of device AR1, the output voltage of transport and placing device AR2=（1+ resistance R4/potentiometer RW1）Multiply in transport and placing device
The in-phase input end electric potential signal of AR2, later the output voltage of transport and placing device AR1 be connected to the in-phase input end of transport and placing device AR4, transport
The output voltage for putting device AR2 is connected to the inverting input of transport and placing device AR3, and transport and placing device AR3 is by in-phase input end and anti-phase input
Hold two electric potential signals（Double-width grinding signal）Be converted to voltage signal（Single-end output signal）, the output end of transport and placing device AR3 is
The amplified output signal of difference ratio（1+ resistance R9/ resistance R3）Multiply the output voltage and transport and placing device AR2 in transport and placing device AR1
The difference of output voltage）, the precision that electrode potential signal is extracted from interfering noise signal and electrode potential signal is improved with this,
And the amplitude of signal is subjected to primary amplification.
Embodiment three, on the basis of embodiment one, the anti-jamming circuit is for filtering out the friendship powered for electrocardiograph
The radio frequency interference of power supply disturbance and miscellaneous equipment is flowed, crosslinking electrode believes the miniature potential of any two points on the human body surface of detection
The filter circuit for entering inductance L1, L2, capacitance C1, C2, C3 composition through conducting wire number respectively, wherein sense L1, capacitance C1 constitute one
The LC of a electrode output current potential filters out AC power interference noise, wherein sense L2, capacitance C2 constitute an electrode output electricity
The LC of position filters out AC power interference noise, and capacitance C1, C2, C3 are that the differential noise of two-way electric potential signal inhibits capacitance,
It adjusts capacitance C3 and noise filtering performance is adjusted, filter out electric potential signal after extra interfering noise signal respectively through resistance R1, R2
It is transferred to difference and adjusts circuit, one end of inductance L1 and one end of inductance L2 are all connected with signal input port, and inductance L1's is another
One end of terminating resistor R1 and one end of resistance R2 and one end of capacitance C3, the other end ground connection of resistance R1, resistance R2's is another
The in-phase input end of one termination transport and placing device AR2, the other end of another termination inductance L2 of capacitance C3 and one end of resistance R5 and
The inverting input of transport and placing device AR1, the other end ground connection of resistance R5.
When the present invention is specifically used, anti-jamming circuit receives the electric potential signal that electrocardiogram machine lead wire transmits, and uses
Inductance L1, L2 and capacitance C3 composition filter circuits filter out unwanted noise signal, enter difference later and adjust circuit, with transport and placing device
AR1, transport and placing device AR2 and transport and placing device AR3 composition compound circuits carry out differential balance enhanced processing, and two current potentials of input are believed
Number voltage signal is converted to, the essence for extracting electrode potential signal from interfering noise signal and electrode potential signal is improved with this
Degree, and the amplitude of signal is subjected to primary amplification, in the circuit of input feedback enhancing later, pass through unijunction transistor Q1, triode
Q2 and slide rheostat RW2 composition composite amplifier amplification difference adjust the amplitude of the voltage signal of circuit output, make electrocardio
Figure machine is apparent, be more accurately displayed out human body heart state, while the signal fed back with transport and placing device AR4, control
The angle of flow of unijunction transistor Q1 processed and then the precision of the amplitude of control amplified signal；
The difference adjusts circuit and is used to carry out differential balance enhanced processing to the electric potential signal exported through anti-jamming circuit, makes electricity
Position signal is not influenced to be amplified to rear class circuit transmission by common mode interference, including with transport and placing device AR1, transport and placing device AR2 and
Transport and placing device AR3, wherein transport and placing device AR1, transport and placing device AR2 constitute differential amplifier, and circuit structure is symmetrical, in addition to having high input resistance
It is anti-outer, also there is very high common mode rejection performance, the inverting input of transport and placing device AR1 to pass through one electrode output of resistance R1 connections
Electric potential signal, the electric potential signal that the in-phase input end of transport and placing device AR2 is exported by resistance R2 one electrode of connection, transport and placing device
The output voltage of AR1=（1+ resistance R6/potentiometer RW1）Multiply the in-phase input end electric potential signal in transport and placing device AR1, transport and placing device
The output voltage of AR2=（1+ resistance R4/potentiometer RW1）Multiply the in-phase input end electric potential signal in transport and placing device AR2, later amplifier
The output voltage of device AR1 is connected to the in-phase input end of transport and placing device AR4, and the output voltage of transport and placing device AR2 is connected to transport and placing device AR3
Inverting input, transport and placing device AR3 is by two electric potential signals of in-phase input end and inverting input（Double-width grinding signal）Conversion
For voltage signal（Single-end output signal）, the output end of transport and placing device AR3 is the amplified output signal of difference ratio（1+ resistance
R9/ resistance R3）Multiply in the difference of the output voltage of the output voltage and transport and placing device AR2 of transport and placing device AR1）, improved from interference with this
The precision of electrode potential signal is extracted in noise signal and electrode potential signal, and the amplitude of signal is subjected to primary amplification, institute
State radio frequency interference of the anti-jamming circuit for filtering out the AC power interference and miscellaneous equipment powered for electrocardiograph, crosslinking electrode
To the miniature potential signals of any two points on the human body surface of detection respectively through conducting wire enter inductance L1, L2, capacitance C1, C2,
The filter circuit of C3 compositions, wherein the LC that sense L1, capacitance C1 constitute an electrode output current potential filters out AC power interference
Noise, wherein the LC that sense L2, capacitance C2 constitute an electrode output current potential filters out AC power interference noise, capacitance C1,
C2, C3 are that the differential noise of two-way electric potential signal inhibits capacitance, adjust capacitance C3 and noise filtering performance is adjusted, and are filtered out extra dry
It disturbs and electric potential signal is transferred to difference through resistance R1, R2 respectively after noise signal adjusts circuit, the feedback enhances circuit and is used for
Composite amplifier, which is formed, by unijunction transistor Q1, triode Q2 and slide rheostat RW2 amplifies difference adjusting circuit output
Voltage signal amplitude, make electrocardiograph is apparent, be more accurately displayed out human body heart state, while use amplifier
The signal that device AR4 is fed back, the angle of flow of control unijunction transistor Q1 and then the precision of the amplitude of control amplified signal, according to
The angle of flow for the Signal Regulation unijunction transistor Q1 that difference adjusts the voltage signal of circuit output and transport and placing device AR4 is fed back,
Generate electrocardio pulse signal with this, after through capacitance C5 enter triode Q2 be core amplifying circuit, by electrocardio pulse signal
Amplification enhancing, is finally output to signal output end by the collector of triode Q2 through capacitance C2.
The above is to combine specific implementation mode is made for the present invention to be further described, and it cannot be said that the present invention
Specific implementation is limited only to this；For belonging to the present invention and for those skilled in the technology concerned, based on skill of the present invention
Under the premise of art scheme thinking, made by expand and operating method, data replacement, should all fall the scope of the present invention it
It is interior.
Claims (3)
1. the signal intensifier circuit of electrocardiograph, including anti-jamming circuit, difference adjust circuit and feedback enhancing circuit, feature
It is, the anti-jamming circuit receives the electric potential signal that electrocardiogram machine lead wire transmits, with inductance L1, L2 and capacitance C3
Composition filter circuit filters out unwanted noise signal, and the difference adjusts circuit and receives anti-jamming circuit output signal, with amplifier
Input feedback enhances circuit after device AR1, transport and placing device AR2 and transport and placing device AR3 composition compound circuits carry out differential balance enhanced processing
Interior, the feedback enhancing circuit forms composite amplifier with unijunction transistor Q1, triode Q2 and slide rheostat RW2,
The signal fed back simultaneously with transport and placing device AR4 controls the amplitude of composite amplifier amplified signal；
The feedback enhancing circuit includes unijunction transistor Q1, one end of the emitter connecting resistance R10 of unijunction transistor Q1 and electricity
Hold one end of C1, the base stage B1 connecting resistances R11 of unijunction transistor Q1, one end of capacitance C5, the base stage B2 of unijunction transistor Q1 connects
The pin 1 of slide rheostat RW2, another terminating resistor R12 of capacitance C5, one end and triode Q2 of resistance R14 base stage, three
The collector connecting resistance R15 of pole pipe Q2, one end of capacitance C2, the emitter connecting resistance R16 of triode Q2, one end of capacitance C4,
Another termination signal output port and resistance of another termination power+5V of resistance R11, resistance R12 and resistance R15, capacitance C2
One end of R18 and the other end of capacitance C6, one end of another terminating resistor R17 of resistance R18 and transport and placing device AR4's is same mutually defeated
Enter end, the other end ground connection of the inverting input of transport and placing device AR4 and capacitance C6, the output end of transport and placing device AR4 and resistance R17's is another
One end of one terminating resistor R13, the emitter of the other end order junction transistors Q1 of resistance R13, the pin of slide rheostat RW2
3, the other end, the electricity of the pin 2 of slide rheostat RW2, the other end of resistance R10, the other end of resistance R14 and resistance R16
Hold the other end ground connection of C4.
2. the signal intensifier circuit of electrocardiograph as described in claim 1, which is characterized in that it includes fortune that the difference, which adjusts circuit,
Put device AR2, the output terminating resistor R3 of transport and placing device AR2, one end of resistance R4, the anti-phase input terminating resistor R4 of transport and placing device AR2
The other end and the pin 1 of slide rheostat RW1, slide rheostat RW1 pin 3, the pin 2 of slide rheostat RW1 connects fortune
Put one end of the in-phase input end and resistance R6 of device AR1, the other end of the output terminating resistor R6 of transport and placing device AR1 and resistance R7's
One end, the in-phase input end of one end and transport and placing device AR3 of another terminating resistor R8 of resistance R7, the other end ground connection of resistance R8,
One end of the other end and resistance R9 of the anti-phase input terminating resistor R3 of transport and placing device AR3, the output terminating resistor R9 of transport and placing device AR3
The other end and capacitance C1 the other end.
3. the signal intensifier circuit of electrocardiograph as described in claim 1, which is characterized in that the anti-jamming circuit includes inductance
One end of L1, inductance L1 and one end of inductance L2 are all connected with signal input port, one end of another terminating resistor R1 of inductance L1
It is grounded with the other end of one end of resistance R2 and one end of capacitance C3, resistance R1, another termination transport and placing device AR2's of resistance R2
In-phase input end, the other end of another termination inductance L2 of capacitance C3 and one end of resistance R5 and the reverse phase of transport and placing device AR1 are defeated
Enter end, the other end ground connection of resistance R5.
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| CN201810143196.8A CN108309280A (en) | 2018-02-11 | 2018-02-11 | The signal intensifier circuit of electrocardiograph |
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| CN201810143196.8A CN108309280A (en) | 2018-02-11 | 2018-02-11 | The signal intensifier circuit of electrocardiograph |
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