CN1611185A - Circuit configuration method and device for monitoring body surface electrocardio signal - Google Patents
Circuit configuration method and device for monitoring body surface electrocardio signal Download PDFInfo
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- CN1611185A CN1611185A CN 200310111961 CN200310111961A CN1611185A CN 1611185 A CN1611185 A CN 1611185A CN 200310111961 CN200310111961 CN 200310111961 CN 200310111961 A CN200310111961 A CN 200310111961A CN 1611185 A CN1611185 A CN 1611185A
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Abstract
The present invention relates to a circuit for monitoring body surface electrocardiosignal, including prime impedance matching circuit, lead exfoliation identification circuit, main amplification circuit, drive circuit, voltage amplification circuit and low pass filter circuit. The output end leads out of the described lead exfoliation identification circuit is an output end of said whole circuit, and said output is connected to a microprocessor. The output end of said main amplification circuit is connected into the input end of said voltage amplification circuit, and the output of said voltage amplification circuit is connected with the low-pass filter circuit, and the output Vout0, Vout1 and Vout2 of said low-pass filter circuit are another three output ends of said whole circuit, and said output ends are connected with A/D converter.
Description
Technical field the present invention relates to semiconductor device amplifying circuit and RC wave filter, particularly at the device that small-signal is carried out suppress when high accuracy is amplified interference noise, relates in particular to the circuit constructive method and the device that are used to monitor body surface ecg.
The situation of background technology prior art: the measuring method of body surface ecg all is to adopt the AgCl electrode that is attached to the body surface ad-hoc location to obtain faint electrocardiosignal, and by cardiac diagnosis lead-line above-mentioned faint electrocardiosignal is sent into electronic amplifier and amplify, obtain the electrocardiosignal of volt level, be converted to digital electrocardiosignal by A/D, can further carry out the feature identification and the calculation of parameter of electrocardiosignal.Because the electrocardiosignal of body surface is the decomposition of the myocardium rhythmicity electricity physiological signal of human heart at body surface, signal is very faint, also is subjected to the interference of power frequency simultaneously, and therefore, obtaining clean, effective electrocardiosignal is the key technology that electrocardiosignal detects.The electronic circuit that present great majority are used for cardiac monitoring is to adopt the meter specially amplifier, the back level adopts the adjustable high pass filter of frequency band, the signal amplifier of Gain Adjustable, circuit units such as low pass filter that frequency band is adjustable and circuit translation are finished the amplification to electrocardiosignal jointly, the circuit structure complexity, it is poor that gain is provided with, passband is provided with concordance.
Summary of the invention technical problem to be solved by this invention is to propose a kind of circuit constructive method and device that is used to monitor body surface ecg for fear of the deficiencies in the prior art part.This circuit arrangement comprises the prime impedance matching circuit, identification circuit, the main amplifying circuit of coming off leads, drive circuit, high-pass filtering circuit, voltage amplification and level prewired circuit, several parts such as low-pass filtering constitute a modular electrocardiogram monitoring structure, mainly finish the impedance matching of signal input part, the functions such as the amplification of electrocardiosignal of identification automatically, the driving of right lower limb, high and low pass filter, fixed gain and level preset that come off of leading.
The present invention can realize by following technical scheme.
Enforcement is used to monitor the circuit constructive method of body surface ecg, comprises step:
A., the prime impedance matching circuit is set, and described circuit comprises right hand passage, left hand passage, left foot passage, chest lead passage and the right lower limb passage that leads that leads that leads that leads; The input of this each passage of circuit connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, in order to improve input impedance;
B., the identification circuit that comes off that leads is set again, the signal input part of this circuit connects the outfan of all channel operation amplifiers in the prime impedance matching circuit, lead when arbitrary road and to come off the output that makes corresponding operational amplifier when reaching full width of cloth voltage output, the come off output of identification circuit of leading becomes high level, after this high level signal was detected by microprocessor, microprocessor carried out corresponding processing controls;
C., main amplifying circuit is set again, operational amplifier in this main amplifying circuit connects and is instrument amplifying circuit form, its homophase and reverse input end insert the output of different two paths in the prime impedance matching circuit respectively, to convert electrocardiosignal to single-ended signal output by double-end signal;
D., drive circuit is set again, right hand passage, left hand the lead output of channel voltage follower of passage and left foot of leading of leading is connected together by resistance and forms a common-mode signal feedback sources, and inserting the input of described drive circuit, drive circuit comprises that right lower limb drives passage and screen layer drives passage; The output that described right lower limb drives passage connects right lower limb driving leads, in order to improve the inhibitory action of whole circuit to common-mode signal; The output that described screen layer drives passage connects the screen layer that leads, and also is in order to improve the inhibitory action of whole circuit to common-mode signal;
E., high-pass filtering circuit is set again, and the input of this circuit connects the output of operational amplifier in the main amplifying circuit, in order to isolate the static polarizing voltage of body surface;
F., voltage amplifier circuit is set again, and the input of this circuit connects the output of high-pass filtering circuit, further amplifies in order to the electrocardiosignal that main amplifying circuit is amplified, and carries out analog digital conversion in order to drive the A/D change-over circuit;
G., the level prewired circuit is set again, and this circuit provides the reference source of output level for operational amplifier in the voltage amplifier circuit, so that the output of electrocardiosignal is in the positive negative direction dynamic change of this reference source;
H., low-pass filter circuit is set again, and the input of this circuit connects the output of voltage amplifier circuit, and in order to further filtering high fdrequency component, output connects the A/D change-over circuit;
I., the place in circuit on positive direct-current power supply, negative dc source and the public ground of positive and negative dc source is set again, is the whole circuit power supply.
Step G is described for operational amplifier in the voltage amplifier circuit provides the reference source of output level, and this reference source level is+2.5V; The described output that makes electrocardiosignal is in the positive negative direction dynamic change of this reference source, and this dynamic change scope is 0～+ 5V.
The present invention can also further be implemented by following technical measures:
A kind of circuit that is used to monitor body surface ecg of Design and Machining comprises the prime impedance matching circuit, identification circuit, main amplifying circuit, drive circuit, voltage amplifier circuit and the low-pass filter circuit of coming off leads; Described prime impedance matching circuit comprises right hand passage, left hand passage, left foot passage, chest lead passage and the right lower limb passage that leads that leads that leads that leads; The input of this each passage of circuit connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, and the output of each voltage follower all inserts the described input of identification circuit of coming off that leads; Right hand passage, left hand the lead output of channel voltage follower of passage and left foot of leading of leading is connected together by resistance in the described prime impedance matching circuit, insert the input of drive circuit then, the output that right lower limb drives passage in the described drive circuit connects right lower limb and drives and lead, and the output that screen layer drives passage connects the screen layer that leads; Described the come off outfan of identification circuit of leading is an outfan of whole circuit, and microprocessor is received in output, and this outfan is a low level at ordinary times, leads when coming off arbitrary, and this outfan becomes high level; Operational amplifier in the described main amplifying circuit connects and is instrument amplifying circuit form, and its homophase and reverse input end insert passage, left hand lead the different two-way in each voltage follower output of passage and chest lead passage of passage, left foot that lead that lead of the right hand in the prime impedance matching circuit respectively; The outfan of described main amplifying circuit inserts the input of described voltage amplifier circuit, and the output of this circuit connects low-pass filter circuit, and the output of described low-pass filter circuit is three outfans of whole circuit, and A/D converter is received in output.
Described prime impedance matching circuit and be connected to the prime low-pass filter circuit between the right hand leads, left hand leads, left foot leads, chest lead and right lower limb lead, each passage all is made of single order RC low pass filter in this circuit.
Be connected to high-pass filtering circuit between described main amplifying circuit and the voltage amplifier circuit, each passage all is made of single order RC high pass filter in this circuit.
Described voltage amplifier circuit comprises three operational amplifiers, and an input of each operational amplifier also connects the outfan of level prewired circuit separately by resistance except connecing feedback resistance; The stabilizing output level of described level prewired circuit is at+2.5V.
Described prime impedance matching circuit comprises 5 operational amplifiers, and each operational amplifier all is connected into the voltage follower form, all connects a resistance between separately in-phase input end and negative supply.
Described drive circuit comprises two operational amplifiers, and the in-phase input end of an operational amplifier and the inverting input of another operational amplifier connect the junction point of 3 resistance; The output of one operational amplifier connects right lower limb leads, and the output of an operational amplifier connects the screen layer that leads.
The described identification circuit that comes off of leading comprises logic circuit chip, operational amplifier and voltage comparator, the in-phase input end of voltage comparator is connected on the dividing point that is made of resistance, logic circuit chip is connected into the voltage follower form, its input connects the outfan of logic circuit chip, the output of logic circuit chip connects the inverting input of voltage comparator, the output of the voltage comparator identification signal output that comes off as leading behind the second-order low-pass filter that resistance capacitance constitutes.
Described prime impedance matching circuit, lead that to come off that identification circuit, main amplifying circuit, drive circuit, voltage amplifier circuit insert by positive direct-current power supply, negative dc source and positive and negative dc source publicly be the whole circuit power supply.
Compared with prior art, the present invention has avoided the conformity error of filter pass band and gain setting, has reduced the diversity of intermodule, has effectively overcome the interference of power frequency, has totally obtained ecg signal data accurately and reliably.
Description of drawings Fig. 1 is that the present invention is used to monitor the circuit constructive method of body surface ecg and the electrical schematic diagram of device;
Fig. 2 is the formation block diagram of device of the present invention;
Fig. 3 is the flow chart of constructive method of the present invention.
The specific embodiment is further described in detail the present invention below in conjunction with most preferred embodiment shown in the drawings: shown in Fig. 1～3, implement to be used to monitor the circuit constructive method of body surface ecg, comprise step
A., prime impedance matching circuit 20 is set, and described circuit 20 comprises right hand RA passage, left hand LA passage, left foot LL passage, chest lead VX passage and the right lower limb RL passage that leads that leads that leads that leads; The input of these circuit 20 each passages connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, in order to improve input impedance;
B., the identification circuit 90 that comes off that leads is set, the signal input part of this circuit 90 connects the outfan of all channel operation amplifiers in the prime impedance matching circuit 20, lead when arbitrary road and to come off the output that makes corresponding operational amplifier when reaching full width of cloth voltage output, the come off output of identification circuit 90 of leading becomes high level, after this high level signal was detected by microprocessor, microprocessor carried out corresponding processing controls;
C., main amplifying circuit 40 is set again, operational amplifier in this main amplifying circuit 40 connects and is instrument amplifying circuit form, its homophase and reverse input end insert the output of different two paths in the prime impedance matching circuit 20 respectively, to convert electrocardiosignal to single-ended signal output by double-end signal;
D. put drive circuit 30, right hand RA passage, left hand the lead output of LL channel voltage follower of LA passage and left foot of leading of leading is connected together by resistance and forms a common-mode signal feedback sources, and inserting the input of described drive circuit 30, drive circuit 30 comprises that right lower limb drives passage and screen layer drives passage; The output that described right lower limb drives passage connects right lower limb and drives the RL that leads, in order to improve the inhibitory action of whole circuit to common-mode signal; The output that described screen layer drives passage meets the screen layer SHIELD that leads, and also is in order to improve the inhibitory action of whole circuit to common-mode signal;
E., high-pass filtering circuit 50 is set, and the input of this circuit 50 connects the output of operational amplifier in the main amplifying circuit 40, in order to isolate the static polarizing voltage of body surface;
F., voltage amplifier circuit 60 is set, and the input of this circuit 60 connects the output of high-pass filtering circuit 50, further amplifies in order to the electrocardiosignal that main amplifying circuit 40 is amplified, and carries out analog digital conversion in order to drive the A/D change-over circuit;
G., level prewired circuit 70 is set, and this circuit 70 provides the reference source of output level for operational amplifier in the voltage amplifier circuit 60, so that the output of electrocardiosignal is in the positive negative direction dynamic change of this reference source;
H., low-pass filter circuit 80 is set, and the input of this circuit 80 connects the output of voltage amplifier circuit 60, and in order to further filtering high fdrequency component, output connects the A/D change-over circuit;
I., the place in circuit of positive direct-current power supply VCC, negative dc source VEE and positive and negative dc source public ground GND is set, is the whole circuit power supply.
Step G is described for operational amplifier in the voltage amplifier circuit 60 provides the reference source of output level, and this reference source level is+2.5V; The described output that makes electrocardiosignal is in the positive negative direction dynamic change of this reference source, and this dynamic change scope is 0～+ 5V.
The present invention can also further obtain implementing by following scheme:
A kind of circuit that is used to monitor body surface ecg of Design and Machining comprises prime impedance matching circuit 20, identification circuit 90, main amplifying circuit 40, drive circuit 30, voltage amplifier circuit 60 and the low-pass filter circuit 80 of coming off leads; Described prime impedance matching circuit 20 comprises right hand RA passage, left hand LA passage, left foot LL passage, chest lead VX passage and the right lower limb RL passage that leads that leads that leads that leads; The input of these circuit 20 each passages connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, and the output of each voltage follower all inserts the described input of identification circuit 90 of coming off that leads; Right hand RA passage, left hand the lead output of LL channel voltage follower of LA passage and left foot of leading of leading is connected together by resistance in the described prime impedance matching circuit 20, insert the input of drive circuit 30 then, the output of right lower limb driving passage connects right lower limb and drives the RL that leads in the described drive circuit 30, and the output that screen layer drives passage meets the screen layer SHIELD that leads; Described the come off outfan LeadsOut of identification circuit 90 of leading is outfans of whole circuit, and microprocessor is received in output, and this outfan is a low level at ordinary times, leads when coming off arbitrary, and this outfan becomes high level; Operational amplifier in the described main amplifying circuit 40 connects and is instrument amplifying circuit form, and its homophase and reverse input end insert RA passage, left hand lead the different two-way in each voltage follower output of LL passage and chest lead VX passage of LA passage, left foot that lead that lead of the right hand in the prime impedance matching circuit 20 respectively; The outfan of described main amplifying circuit 40 inserts the input of described voltage amplifier circuit 60, the output of this circuit 60 connects low-pass filter circuit 80, output Vout0, the Vout1 of described low-pass filter circuit 80 and Vout2 are three outfans of whole circuit, and A/D converter is received in output.
The described prime impedance matching circuit 20 and right hand RA, left hand lead LL, chest lead VX and the right lower limb of LA, left foot that lead that lead leads and is connected to prime low-pass filter circuit 10 between the RL, and each passage all is made of single order RC low pass filter in this circuit 10.
Be connected to high-pass filtering circuit 50 between described main amplifying circuit 40 and the voltage amplifier circuit 60, each passage all is made of single order RC high pass filter in this circuit 50.
Described voltage amplifier circuit 60 comprises operational amplifier U1B, U2B and U3B, and an input of each operational amplifier also connects the outfan of level prewired circuit 70 by resistance R 5, R15 and R25 except meeting feedback resistance R6, R16 and R26; The stabilizing output level of described level prewired circuit 70 is at+2.5V.
Described prime impedance matching circuit 20 comprises operational amplifier U1A, U2A, U3A, U4A and U61B, each operational amplifier all is connected into the voltage follower form, all meets a resistance R 2, R12, R22, R32 and R42 between separately in-phase input end and negative supply VEE.
Described drive circuit 30 comprises operational amplifier U5A and U5B, inverting input connecting resistance R51, the R52 of the in-phase input end of operational amplifier U5A and operational amplifier U5B and the junction point of R53; The output of operational amplifier U5B meets the right lower limb RL that leads, and the output of operational amplifier U5A meets the screen layer SHIELD that leads.
The described identification circuit 90 that comes off of leading comprises logic circuit chip U50, operational amplifier U61A and voltage comparator U71A, the in-phase input end of voltage comparator U71A is connected on the dividing point that is made of resistance R 61 and R62, logic circuit chip U50 is connected into the voltage follower form, its input connects the outfan of logic circuit chip U50, the output of logic circuit chip U50 connects the inverting input of voltage comparator U71A, the output of the voltage comparator U71A identification signal LeadsOUT output that comes off as leading behind the second-order low-pass filter that R63, R64, C61, C62 constitute.
Described prime impedance matching circuit 20, lead that to come off that identification circuit 90, main amplifying circuit 40, drive circuit 30, voltage amplifier circuit 60 insert by positive direct-current power supply VCC, negative dc source VEE and positive and negative dc source public ground GND be that whole circuit is powered.
Operation principle of the present invention and characteristics are such:
Because body surface ecg is very faint, electrocardiosignal is led and human body contact resistance and electrocardiosignal source have bigger internal resistance, in order to obtain electrocardiosignal effectively, prime impedance matching circuit 20 need be set, most preferred embodiment of the present invention has adopted the operational amplifier with JET input in match circuit 20, connect into the voltage follower circuit form, improve the input impedance of electrocardio testing circuit, can obtain electrocardiosignal to greatest extent.
The in-phase end of each amplifier applies the negative DC voltage of a 5V by the resistance of a big resistance in prime impedance matching circuit 20, and connect the in-phase end of a voltage comparator at the outfan of this amplifier, and reference voltage of the anti-phase termination of this comparator, when leading normal the use, above-mentioned 5V voltage is because the human body resistance dividing potential drop obtains the input of very little voltage to amplifier, just be added in the in-phase end of above-mentioned voltage comparator, at this moment the current potential height of this comparator end of oppisite phase is output as low level; Lead when coming off when certain, the unsettled then human body resistance that leads increases to approach infinity, and at this moment the in-phase end that just is input to comparator of this 5V makes the current potential of in-phase end be higher than end of oppisite phase, and then comparator is output as high level.
Because there is bigger static polarizing voltage in body surface, may up to+/-300mV, do not isolate and to produce the follow-up saturated phenomenon of amplifying circuit output, need be by high-pass filtering circuit every going this polarizing voltage, guarantee the operate as normal of follow-up amplifying circuit, one-level RC high-pass filtering circuit 50 is set here, is 0.05Hz (three dB bandwidth) according to the lower bound frequency of this high-pass filtering circuit of electrocardiosignal standard-required.
Because the high fdrequency component of electrocardiosignal is few, and the overwhelming majority all concentrates on below the 40Hz, according to the standard of diagnosis electrocardiosignal and the restriction of subsequent data inversion frequency, low-pass filter circuit 80 is set, here be to adopt one-level RC low-pass filtering, the cut-off frequency of this low-pass filtering is set to 120Hz.
Facts have proved, the present invention is used to monitor the circuit constructive method of body surface ecg and the conformity error that device has avoided filter pass band and gain to be provided with, reduce the diversity of intermodule, effectively overcome the interference of power frequency, totally obtained ecg signal data accurately and reliably.
Claims (10)
1. be used to monitor the circuit constructive method of body surface ecg, it is characterized in that: comprise step
A., prime impedance matching circuit (20) is set, and described circuit (20) comprises right hand RA passage, left hand LA passage, left foot LL passage, chest lead VX passage and the right lower limb RL passage that leads that leads that leads that leads; The input of each passage of this circuit (20) connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, in order to improve input impedance;
B., the identification circuit (90) that comes off that leads is set again, the signal input part of this circuit (90) connects the outfan of all channel operation amplifiers in the prime impedance matching circuit (20), lead when arbitrary road and to come off the output that makes corresponding operational amplifier when reaching full width of cloth voltage output, the come off output of identification circuit (90) of leading becomes high level, after this high level signal was detected by microprocessor, microprocessor carried out corresponding processing controls;
C., main amplifying circuit (40) is set again, operational amplifier in this main amplifying circuit (40) connects and is instrument amplifying circuit form, its homophase and reverse input end insert the output of different two paths in the prime impedance matching circuit (20) respectively, to convert electrocardiosignal to single-ended signal output by double-end signal;
D., drive circuit (30) is set again, right hand RA passage, left hand the lead output of LL channel voltage follower of LA passage and left foot of leading of leading is connected together by resistance and forms a common-mode signal feedback sources, and inserting the input of described drive circuit (30), drive circuit (30) comprises that right lower limb drives passage and screen layer drives passage; The output that described right lower limb drives passage connects right lower limb and drives the RL that leads, in order to improve the inhibitory action of whole circuit to common-mode signal; The output that described screen layer drives passage meets the screen layer SHIELD that leads, and also is in order to improve the inhibitory action of whole circuit to common-mode signal;
E., high-pass filtering circuit (50) is set again, and the input of this circuit (50) connects the output of operational amplifier in the main amplifying circuit (40), in order to isolate the static polarizing voltage of body surface;
F., voltage amplifier circuit (60) is set again, and the input of this circuit (60) connects the output of high-pass filtering circuit (50), further amplifies in order to the electrocardiosignal that main amplifying circuit (40) is amplified, and carries out analog digital conversion in order to drive the A/D change-over circuit;
G., level prewired circuit (70) is set again, and this circuit (70) is the reference source that operational amplifier provides output level in the voltage amplifier circuit (60), so that the output of electrocardiosignal is in the positive negative direction dynamic change of this reference source;
H., low-pass filter circuit (80) is set again, and the input of this circuit (80) connects the output of voltage amplifier circuit (60), and in order to further filtering high fdrequency component, output connects the A/D change-over circuit;
I., the place in circuit of positive direct-current power supply VCC, negative dc source VEE and positive and negative dc source public ground GND is set again, is the whole circuit power supply.
2. according to the described circuit constructive method that is used to monitor body surface ecg of claim 1, it is characterized in that: step G is described to be the reference source that operational amplifier provides output level in the voltage amplifier circuit (60), and this reference source level is+2.5V; The described output that makes electrocardiosignal is in the positive negative direction dynamic change of this reference source, and this dynamic change scope is 0～+ 5V.
3. circuit that is used to monitor body surface ecg is characterized in that: comprise prime impedance matching circuit (20), identification circuit (90), main amplifying circuit (40), drive circuit (30), voltage amplifier circuit (60) and the low-pass filter circuit (80) of coming off leads; Described prime impedance matching circuit (20) comprises right hand RA passage, left hand LA passage, left foot LL passage, chest lead VX passage and the right lower limb RL passage that leads that leads that leads that leads; The input of each passage of this circuit (20) connects leading separately, and the operational amplifier in each passage all is connected into the voltage follower form, and the output of each voltage follower all inserts the described input of identification circuit (90) of coming off that leads; Right hand RA passage, left hand the lead output of LL channel voltage follower of LA passage and left foot of leading of leading is connected together by resistance in the described prime impedance matching circuit (20), insert the input of drive circuit (30) then, the output of right lower limb driving passage connects right lower limb and drives the RL that leads in the described drive circuit (30), and the output that screen layer drives passage meets the screen layer SHIELD that leads; Described the come off outfan LeadsOut of identification circuit (90) of leading is an outfan of whole circuit, and microprocessor is received in output, and this outfan is a low level at ordinary times, leads when coming off arbitrary, and this outfan becomes high level; Operational amplifier in the described main amplifying circuit (40) connects and is instrument amplifying circuit form, and its homophase and reverse input end insert RA passage, left hand lead the different two-way in each voltage follower output of LL passage and chest lead VX passage of LA passage, left foot that lead that lead of the right hand in the prime impedance matching circuit (20) respectively; The outfan of described main amplifying circuit (40) inserts the input of described voltage amplifier circuit (60), the output of this circuit (60) connects low-pass filter circuit (80), output Vout0, the Vout1 of described low-pass filter circuit (80) and Vout2 are three outfans of whole circuit, and A/D converter is received in output.
4. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: the described prime impedance matching circuit (20) and right hand RA, left hand lead LL, chest lead VX and the right lower limb of LA, left foot that lead that lead leads and is connected to prime low-pass filter circuit (10) between the RL, and each passage all is made of single order RC low pass filter in this circuit (10).
5. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: be connected to high-pass filtering circuit (50) between described main amplifying circuit (40) and the voltage amplifier circuit (60), each passage all is made of single order RC high pass filter in this circuit (50).
6. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: described voltage amplifier circuit (60) comprises operational amplifier U1B, U2B and U3B, an input of each operational amplifier also connects the outfan of level prewired circuit (70) by resistance R 5, R15 and R25 except meeting feedback resistance R6, R16 and R26; The stabilizing output level of described level prewired circuit (70) is at+2.5V.
7. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: described prime impedance matching circuit (20) comprises operational amplifier U1A, U2A, U3A, U4A and U61B, each operational amplifier all is connected into the voltage follower form, all meets a resistance R 2, R12, R22, R32 and R42 between separately in-phase input end and negative supply VEE.
8. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: described drive circuit (30) comprises that operational amplifier U5A and U5B are, inverting input connecting resistance R51, the R52 of the in-phase input end of operational amplifier U5A and operational amplifier U5B and the junction point of R53; The output of operational amplifier U5B meets the right lower limb RL that leads, and the output of operational amplifier U5A meets the screen layer SHIELD that leads.
9. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: the described identification circuit (90) that comes off of leading comprises logic circuit chip U50, operational amplifier U61A and voltage comparator U71A are, the in-phase input end of voltage comparator U71A is connected on the dividing point that is made of resistance R 61 and R62, logic circuit chip U50 is connected into the voltage follower form, its input connects the outfan of logic circuit chip U50, the output of logic circuit chip U50 connects the inverting input of voltage comparator U71A, and the output of voltage comparator U71A is through R63, R64, C61, identification signal LeadsOUT output comes off as leading behind the second-order low-pass filter that C62 constitutes.
10. according to the described circuit that is used to monitor body surface ecg of claim 3, it is characterized in that: described prime impedance matching circuit (20), lead that to come off that identification circuit (90), main amplifying circuit (40), drive circuit (30), voltage amplifier circuit (60) insert by positive direct-current power supply VCC, negative dc source VEE and positive and negative dc source public ground GND be that whole circuit is powered.
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| CN 200310111961 CN1611185A (en) | 2003-10-27 | 2003-10-27 | Circuit configuration method and device for monitoring body surface electrocardio signal |
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