CN203935181U - A kind of ecg signal amplifier - Google Patents
A kind of ecg signal amplifier Download PDFInfo
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- CN203935181U CN203935181U CN201420222688.3U CN201420222688U CN203935181U CN 203935181 U CN203935181 U CN 203935181U CN 201420222688 U CN201420222688 U CN 201420222688U CN 203935181 U CN203935181 U CN 203935181U
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Abstract
A kind of ecg signal amplifier, it comprises being connected to and between core signal sensor and electrocardiosignal processing system, is connected in series successively pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit 7; Described pre-amplification circuit comprises the differential amplifier circuit of both-end input, both-end output, common mode sampling drive circuit, and resaistance-capacity coupling circuit, and both-end is inputted, the differential amplifier circuit of Single-end output; This utility model amplifies electrocardiosignal by pre-amplification circuit is set; The severe jamming that is suppressed baseline drift and elimination high-frequency harmonic by the bandwidth-limited circuit in high-pass filtering circuit and low-pass filter circuit Zhucheng is set; Design level lifting circuit is avoided electrocardiosignal distortion; 50HZ trap circuit is set and eliminates the interference of 50Hz power frequency.This utility model by electrocardiosignal is amplified, filtering, level lifting and trap processing, obtained the very high amplifier of gain, performance is good, precision is high, volume is little and energy consumption is lower.
Description
Technical field
This utility model relates to signal amplification technique field, specifically a kind of ecg signal amplifier.
Background technology
Electrocardiosignal is a kind of typical physiology signal, has the universals of bioelectrical signals, as little in amplitude, frequency is low and be subject to external environmental interference, for gathering and measurement has brought difficulty.
Due to the various particular/special requirements of ecg signal acquiring, conventional ecg signal amplifier is made up of preamplifier, isolated DC high pass filter and the low-pass filter amplifier of cascade.The high speed development of current medical industry, medical treatment detection device is proposed to more and more higher requirement, at present dynamic range that high input impedance, high-gain, high cmrr, low noise, low drift, suitable passband width and output are larger etc. to the requirement of ecg signal amplifier, but existing ecg signal amplifier cannot meet above-mentioned requirements.
Utility model content
For above-mentioned deficiency, this utility model provides the ecg signal amplifier that a kind of performance is good, precision is high, volume is little and energy consumption is lower.
This utility model solves the technical scheme that its technical problem adopts: a kind of ecg signal amplifier, it is characterized in that, comprise pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit, described pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit is connected between core signal sensor and electrocardiosignal processing system after connecting successively, to electrocardiosignal amplify, filtering, level lifting and trap processing; Described pre-amplification circuit comprises the differential amplifier circuit of both-end input, both-end output, common mode sampling drive circuit, and resaistance-capacity coupling circuit, and both-end is inputted, the differential amplifier circuit of Single-end output; The double input end of the differential amplifier circuit of described both-end input, both-end output is connected with organism contact electrode, and double input end is connected with the double input end of the differential amplifier circuit of both-end input, Single-end output with resaistance-capacity coupling circuit through common mode sampling drive circuit successively; Described bandwidth-limited circuit comprises high-pass filtering circuit and low-pass filter circuit, and described high-pass filtering circuit and low-pass filter circuit are connected in series.
Preferably, the differential amplifier circuit of described both-end input, both-end output comprises the first operational amplifier U1, the second operational amplifier U2, resistance R 1, resistance R 2 and resistance R 3, described common mode sampling drive circuit comprises the 3rd operational amplifier U3, resistance R 4 and resistance R 5, described resaistance-capacity coupling circuit comprises capacitor C 1, capacitor C 2, resistance R 6 and resistance R 7, and the differential amplifier circuit of described both-end input, Single-end output comprises instrument amplifier A1 and varistor R8; The positive input of described the first operational amplifier U1 and the second operational amplifier U2 is connected with organism contact electrode respectively, series resistance R3 between reverse input end, difference series resistance R1 and resistance R 2 between the reverse input end of the first operational amplifier U1 and the second operational amplifier U2 and outfan; After the outfan series capacitance C1 of described the first operational amplifier U1, be connected with the reverse input end of instrument amplifier A1, after the outfan series capacitance C2 of described the second operational amplifier U2, be connected with the positive input of instrument amplifier A1; The positive input of described the 3rd operational amplifier U3 is connected with the outfan of the first operational amplifier U1 and the second operational amplifier U2 with resistance R 5 through resistance R 4 respectively, inverting input is connected with outfan, and outfan is connected with reverse input end and the positive input of instrument amplifier A1 with resistance R 7 through resistance R 6 respectively; Described varistor R8 is the external gain-adjusted resistance of instrument amplifier A1.
Preferably, described the first operational amplifier U1, the second operational amplifier U2 and the 3rd operational amplifier U3 all adopt LM324 integrated circuit, and described instrument amplifier A1 adopts AD620 amplifier.
Preferably, described high-pass filtering circuit comprises four-operational amplifier U4, resistance R 9 and capacitor C 3, the positive input of described four-operational amplifier U4, through resistance R 9 ground connection, is connected with the outfan of pre-amplification circuit through capacitor C 3 simultaneously, and inverting input is connected with outfan; Described low-pass filter circuit comprises the 5th operational amplifier U5, resistance R 10, resistance R 11, capacitor C 4 and capacitor C 5, the positive input of described the 5th operational amplifier U5 is through capacitor C 4 ground connection, simultaneously successively series resistance R11 with after resistance R 10 with four-operational amplifier U4 outfan be connected, inverting input is connected with outfan, after the outfan series capacitance C5 of the 5th operational amplifier U5, is connected between resistance R 10 and resistance R 11.
Preferably, described four-operational amplifier U4 and the 5th operational amplifier U5 all adopt LM324 integrated circuit.
Preferably, described level lifting circuit comprises the 6th operational amplifier U6, resistance R 12, resistance R 13, resistance R 14, resistance R 15 and adjustable resistance RW1, the positive input of described the 6th operational amplifier U6 is through resistance R 15 ground connection, after inverting input series resistance R12, be connected with the outfan of bandwidth-limited circuit, be connected with the adjustable end of adjustable resistance RW1 through resistance R 14 simultaneously, the two ends of described adjustable resistance RW1 are connected with positive and negative voltage end respectively, series resistance R13 between inverting input and outfan.
Preferably, the 6th described operational amplifier U6 adopts LM324 integrated circuit.
Preferably, described 50HZ trap circuit comprises the 7th operational amplifier U7, the 8th operational amplifier U8, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, capacitor C 6, capacitor C 7, capacitor C 8 and capacitor C 9; The positive input of described the 7th operational amplifier U7 is connected with the outfan of level lifting circuit through parallel circuit, described parallel circuit is formed in parallel by the series circuit of the series circuit of resistance R 16, resistance R 17 and capacitor C 6, capacitor C 7, and the inverting input of the 7th operational amplifier U7 is connected with outfan; The positive input of described the 8th operational amplifier U8 is connected with the outfan of the 7th operational amplifier U7 through resistance R 20, pass through resistance R 21 ground connection simultaneously, inverting input is connected with outfan, outfan is connected between capacitor C 6 and capacitor C 7 through the parallel circuit of resistance R 18 and resistance R 19, is connected between resistance R 16 and resistance R 17 through the parallel circuit of capacitor C 8 and capacitor C 9 simultaneously.
Preferably, the 7th described operational amplifier U7 and the 8th operational amplifier U8 all adopt LM324 integrated circuit.
The utlity model has following outstanding beneficial effect: because electrocardiosignal is small-signal, amplify electrocardiosignal so this utility model arranges pre-amplification circuit; In order to suppress the severe jamming of baseline drift and elimination high-frequency harmonic, be provided with the bandwidth-limited circuit by high-pass filtering circuit and low-pass filter circuit Zhucheng; Undistorted for electrocardiosignal, design level lifting circuit; Disturb in order to eliminate 50 Hz power frequencies, be provided with 50HZ trap circuit.This utility model by electrocardiosignal is amplified, filtering, level lifting and trap processing, obtained the very high amplifier of gain, performance is good, precision is high, volume is little and energy consumption is lower.
Brief description of the drawings
Below in conjunction with accompanying drawing, the utility model is described in further detail:
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is the circuit diagram of pre-amplification circuit described in the utility model;
Fig. 3 is the circuit diagram of high-pass filtering circuit described in the utility model;
Fig. 4 is the circuit diagram of low-pass filter circuit described in the utility model;
Fig. 5 is the circuit diagram of level lifting circuit described in the utility model;
Fig. 6 is the circuit diagram of 50HZ trap circuit described in the utility model.
Detailed description of the invention
As shown in Figure 1, a kind of ecg signal amplifier of the present utility model, it comprises pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit, described pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit is connected between core signal sensor and electrocardiosignal processing system after connecting successively, to electrocardiosignal amplify, filtering, level lifting and trap processing.
As shown in Figure 2, pre-amplification circuit described in the utility model comprises the differential amplifier circuit of both-end input, both-end output, common mode sampling drive circuit, and resaistance-capacity coupling circuit, and both-end is inputted, the differential amplifier circuit of Single-end output; The double input end of the differential amplifier circuit of described both-end input, both-end output is connected with organism contact electrode, and double input end is connected with the double input end of the differential amplifier circuit of both-end input, Single-end output with resaistance-capacity coupling circuit through common mode sampling drive circuit successively.The differential amplifier circuit of described both-end input, both-end output comprises the first operational amplifier U1, the second operational amplifier U2, resistance R 1, resistance R 2 and resistance R 3, described common mode sampling drive circuit comprises the 3rd operational amplifier U3, resistance R 4 and resistance R 5, described resaistance-capacity coupling circuit comprises capacitor C 1, capacitor C 2, resistance R 6 and resistance R 7, and the differential amplifier circuit of described both-end input, Single-end output comprises instrument amplifier A1 and varistor R8; The positive input of described the first operational amplifier U1 and the second operational amplifier U2 is connected with organism contact electrode respectively, series resistance R3 between reverse input end, difference series resistance R1 and resistance R 2 between the reverse input end of the first operational amplifier U1 and the second operational amplifier U2 and outfan; After the outfan series capacitance C1 of described the first operational amplifier U1, be connected with the reverse input end of instrument amplifier A1, after the outfan series capacitance C2 of described the second operational amplifier U2, be connected with the positive input of instrument amplifier A1; The positive input of described the 3rd operational amplifier U3 is connected with the outfan of the first operational amplifier U1 and the second operational amplifier U2 with resistance R 5 through resistance R 4 respectively, inverting input is connected with outfan, and outfan is connected with reverse input end and the positive input of instrument amplifier A1 with resistance R 7 through resistance R 6 respectively; Described varistor R8 is the external gain-adjusted resistance of instrument amplifier A1.Wherein, described the first operational amplifier U1, the second operational amplifier U2 and the 3rd operational amplifier U3 all adopt LM324 integrated circuit, and described instrument amplifier A1 adopts AD620 amplifier.
As shown in Figure 3 and Figure 4, bandwidth-limited circuit described in the utility model comprises the high-pass filtering circuit and the low-pass filter circuit that are connected in series; Described high-pass filtering circuit comprises four-operational amplifier U4, resistance R 9 and capacitor C 3, the positive input of described four-operational amplifier U4 is through resistance R 9 ground connection, be connected with the outfan of pre-amplification circuit through capacitor C 3, inverting input is connected with outfan simultaneously; Described low-pass filter circuit comprises the 5th operational amplifier U5, resistance R 10, resistance R 11, capacitor C 4 and capacitor C 5, the positive input of described the 5th operational amplifier U5 is through capacitor C 4 ground connection, simultaneously successively series resistance R11 with after resistance R 10 with four-operational amplifier U4 outfan be connected, inverting input is connected with outfan, after the outfan series capacitance C5 of the 5th operational amplifier U5, is connected between resistance R 10 and resistance R 11.Wherein, described four-operational amplifier U4 and the 5th operational amplifier U5 all adopt LM324 integrated circuit.
As shown in Figure 5, level lifting circuit described in the utility model comprises the 6th operational amplifier U6, resistance R 12, resistance R 13, resistance R 14, resistance R 15 and adjustable resistance RW1, the positive input of described the 6th operational amplifier U6 is through resistance R 15 ground connection, after inverting input series resistance R12, be connected with the outfan of bandwidth-limited circuit, be connected with the adjustable end of adjustable resistance RW1 through resistance R 14 simultaneously, the two ends of described adjustable resistance RW1 are connected with positive and negative voltage end respectively, series resistance R13 between inverting input and outfan.Wherein, the 6th described operational amplifier U6 adopts LM324 integrated circuit.
As shown in Figure 6,50HZ trap circuit described in the utility model comprises the 7th operational amplifier U7, the 8th operational amplifier U8, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, capacitor C 6, capacitor C 7, capacitor C 8 and capacitor C 9; The positive input of described the 7th operational amplifier U7 is connected with the outfan of level lifting circuit through parallel circuit, described parallel circuit is formed in parallel by the series circuit of the series circuit of resistance R 16, resistance R 17 and capacitor C 6, capacitor C 7, and the inverting input of the 7th operational amplifier U7 is connected with outfan; The positive input of described the 8th operational amplifier U8 is connected with the outfan of the 7th operational amplifier U7 through resistance R 20, pass through resistance R 21 ground connection simultaneously, inverting input is connected with outfan, outfan is connected between capacitor C 6 and capacitor C 7 through the parallel circuit of resistance R 18 and resistance R 19, is connected between resistance R 16 and resistance R 17 through the parallel circuit of capacitor C 8 and capacitor C 9 simultaneously.Wherein, described the 7th operational amplifier U7 and the 8th operational amplifier U8 all adopt LM324 integrated circuit, and described resistance R 16, resistance R 17, resistance R 18, resistance R 19, capacitor C 6, capacitor C 7, capacitor C 8 and capacitor C 9 form a capacitance-resistance twin-T network.
It should be noted that illustrated parts are not necessarily drawn in proportion in the accompanying drawings.This utility model has omitted the description of known assemblies and treatment technology and technique to avoid unnecessarily limiting this utility model.
The above is preferred implementation of the present utility model; for those skilled in the art; not departing under the prerequisite of this utility model principle, can also make some improvements and modifications, these improvements and modifications are also regarded as protection domain of the present utility model.
Claims (9)
1. an ecg signal amplifier, it is characterized in that, comprise pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit, described pre-amplification circuit, bandwidth-limited circuit, level lifting circuit and 50HZ trap circuit is connected between core signal sensor and electrocardiosignal processing system after connecting successively, to electrocardiosignal amplify, filtering, level lifting and trap processing; Described pre-amplification circuit comprises the differential amplifier circuit of both-end input, both-end output, common mode sampling drive circuit, and resaistance-capacity coupling circuit, and both-end is inputted, the differential amplifier circuit of Single-end output; The double input end of the differential amplifier circuit of described both-end input, both-end output is connected with organism contact electrode, and double input end is connected with the double input end of the differential amplifier circuit of both-end input, Single-end output with resaistance-capacity coupling circuit through common mode sampling drive circuit successively; Described bandwidth-limited circuit comprises high-pass filtering circuit and low-pass filter circuit, and described high-pass filtering circuit and low-pass filter circuit are connected in series.
2. a kind of ecg signal amplifier according to claim 1, it is characterized in that, the differential amplifier circuit of described both-end input, both-end output comprises the first operational amplifier U1, the second operational amplifier U2, resistance R 1, resistance R 2 and resistance R 3, described common mode sampling drive circuit comprises the 3rd operational amplifier U3, resistance R 4 and resistance R 5, described resaistance-capacity coupling circuit comprises capacitor C 1, capacitor C 2, resistance R 6 and resistance R 7, and the differential amplifier circuit of described both-end input, Single-end output comprises instrument amplifier A1 and varistor R8; The positive input of described the first operational amplifier U1 and the second operational amplifier U2 is connected with organism contact electrode respectively, series resistance R3 between reverse input end, difference series resistance R1 and resistance R 2 between the reverse input end of the first operational amplifier U1 and the second operational amplifier U2 and outfan; After the outfan series capacitance C1 of described the first operational amplifier U1, be connected with the reverse input end of instrument amplifier A1, after the outfan series capacitance C2 of described the second operational amplifier U2, be connected with the positive input of instrument amplifier A1; The positive input of described the 3rd operational amplifier U3 is connected with the outfan of the first operational amplifier U1 and the second operational amplifier U2 with resistance R 5 through resistance R 4 respectively, inverting input is connected with outfan, and outfan is connected with reverse input end and the positive input of instrument amplifier A1 with resistance R 7 through resistance R 6 respectively; Described varistor R8 is the external gain-adjusted resistance of instrument amplifier A1.
3. a kind of ecg signal amplifier according to claim 2, it is characterized in that, described the first operational amplifier U1, the second operational amplifier U2 and the 3rd operational amplifier U3 all adopt LM324 integrated circuit, and described instrument amplifier A1 adopts AD620 amplifier.
4. a kind of ecg signal amplifier according to claim 1, it is characterized in that, described high-pass filtering circuit comprises four-operational amplifier U4, resistance R 9 and capacitor C 3, the positive input of described four-operational amplifier U4 is through resistance R 9 ground connection, be connected with the outfan of pre-amplification circuit through capacitor C 3, inverting input is connected with outfan simultaneously; Described low-pass filter circuit comprises the 5th operational amplifier U5, resistance R 10, resistance R 11, capacitor C 4 and capacitor C 5, the positive input of described the 5th operational amplifier U5 is through capacitor C 4 ground connection, simultaneously successively series resistance R11 with after resistance R 10 with four-operational amplifier U4 outfan be connected, inverting input is connected with outfan, after the outfan series capacitance C5 of the 5th operational amplifier U5, is connected between resistance R 10 and resistance R 11.
5. a kind of ecg signal amplifier according to claim 4, is characterized in that, described four-operational amplifier U4 and the 5th operational amplifier U5 all adopt LM324 integrated circuit.
6. a kind of ecg signal amplifier according to claim 1, it is characterized in that, described level lifting circuit comprises the 6th operational amplifier U6, resistance R 12, resistance R 13, resistance R 14, resistance R 15 and adjustable resistance RW1, the positive input of described the 6th operational amplifier U6 is through resistance R 15 ground connection, after inverting input series resistance R12, be connected with the outfan of bandwidth-limited circuit, be connected with the adjustable end of adjustable resistance RW1 through resistance R 14 simultaneously, the two ends of described adjustable resistance RW1 respectively with just, negative voltage side connects, series resistance R13 between inverting input and outfan.
7. a kind of ecg signal amplifier according to claim 6, is characterized in that, the 6th described operational amplifier U6 adopts LM324 integrated circuit.
8. a kind of ecg signal amplifier according to claim 1, it is characterized in that, described 50HZ trap circuit comprises the 7th operational amplifier U7, the 8th operational amplifier U8, resistance R 16, resistance R 17, resistance R 18, resistance R 19, resistance R 20, resistance R 21, capacitor C 6, capacitor C 7, capacitor C 8 and capacitor C 9; The positive input of described the 7th operational amplifier U7 is connected with the outfan of level lifting circuit through parallel circuit, described parallel circuit is formed in parallel by the series circuit of the series circuit of resistance R 16, resistance R 17 and capacitor C 6, capacitor C 7, and the inverting input of the 7th operational amplifier U7 is connected with outfan; The positive input of described the 8th operational amplifier U8 is connected with the outfan of the 7th operational amplifier U7 through resistance R 20, pass through resistance R 21 ground connection simultaneously, inverting input is connected with outfan, outfan is connected between capacitor C 6 and capacitor C 7 through the parallel circuit of resistance R 18 and resistance R 19, is connected between resistance R 16 and resistance R 17 through the parallel circuit of capacitor C 8 and capacitor C 9 simultaneously.
9. a kind of ecg signal amplifier according to claim 8, is characterized in that, described the 7th operational amplifier U7 and the 8th operational amplifier U8 all adopt LM324 integrated circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420222688.3U CN203935181U (en) | 2014-05-04 | 2014-05-04 | A kind of ecg signal amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420222688.3U CN203935181U (en) | 2014-05-04 | 2014-05-04 | A kind of ecg signal amplifier |
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| CN203935181U true CN203935181U (en) | 2014-11-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420222688.3U Expired - Fee Related CN203935181U (en) | 2014-05-04 | 2014-05-04 | A kind of ecg signal amplifier |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104000576A (en) * | 2014-05-04 | 2014-08-27 | 山东中医药大学 | Electrocardiosignal amplifier |
| CN104757965A (en) * | 2015-04-30 | 2015-07-08 | 张释文 | DSP-based heart rate measurement device |
| CN106725368A (en) * | 2016-12-27 | 2017-05-31 | 合肥讯创信息科技有限公司 | Traditional Chinese medicine pulse electro pulsograph |
| CN106725369A (en) * | 2016-12-27 | 2017-05-31 | 合肥讯创信息科技有限公司 | A kind of long-range electropulsograph |
| CN112617866A (en) * | 2020-12-31 | 2021-04-09 | 深圳美格尔生物医疗集团有限公司 | EMG (electromagnetic EMG) electromyographic signal digital acquisition circuit and system |
| CN111812567B (en) * | 2019-04-10 | 2023-08-04 | 西门子医疗有限公司 | Single stage amplifier with active feedback compensation |
-
2014
- 2014-05-04 CN CN201420222688.3U patent/CN203935181U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104000576A (en) * | 2014-05-04 | 2014-08-27 | 山东中医药大学 | Electrocardiosignal amplifier |
| CN104757965A (en) * | 2015-04-30 | 2015-07-08 | 张释文 | DSP-based heart rate measurement device |
| CN106725368A (en) * | 2016-12-27 | 2017-05-31 | 合肥讯创信息科技有限公司 | Traditional Chinese medicine pulse electro pulsograph |
| CN106725369A (en) * | 2016-12-27 | 2017-05-31 | 合肥讯创信息科技有限公司 | A kind of long-range electropulsograph |
| CN111812567B (en) * | 2019-04-10 | 2023-08-04 | 西门子医疗有限公司 | Single stage amplifier with active feedback compensation |
| CN112617866A (en) * | 2020-12-31 | 2021-04-09 | 深圳美格尔生物医疗集团有限公司 | EMG (electromagnetic EMG) electromyographic signal digital acquisition circuit and system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141112 Termination date: 20180504 |
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| CF01 | Termination of patent right due to non-payment of annual fee |