Electrocardiogram (ECG) signal conditioning circuit

A technology of ECG signal and conditioning circuit, which is applied in medical science, sensors, diagnostic recording/measurement, etc., can solve problems such as strong randomness, interference, and low frequency, and achieve high common-mode rejection ratio, low noise, and improved accuracy Effect

Inactive Publication Date: 2017-04-05
李福霞
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Problems solved by technology

However, the ECG signal is a low-frequency weak signal in the background of strong noise, which has the characteristics of strong randomness and low frequency, and is easily disturbed by the internal noise of the detection system and external stimuli (environment, temperature). Only by doing a series of processing (filtering out noise and interference) can high-fidelity ECG information be obtained, providing an accurate and effective data source for further analysis and research of ECG information from a medical perspective

Method used

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  • Electrocardiogram (ECG) signal conditioning circuit
  • Electrocardiogram (ECG) signal conditioning circuit
  • Electrocardiogram (ECG) signal conditioning circuit

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with drawings and embodiments.

[0021] like figure 1 , the primary amplification circuit linearly amplifies the ECG signal extracted from the human body surface; after the zero drift is suppressed by the zero adjustment circuit, it is sent to the wave limiting circuit and the bandpass filter circuit to filter out the clutter interference signal; The secondary amplifying circuit is sent to the A / D conversion part for signal sampling.

[0022] like figure 2 , the performance of the primary amplifier circuit directly determines the authenticity of the follow-up system for data analysis and processing, and realizes the functions of linearly amplifying the detected ECG signal and suppressing interference signals. According to the characteristics of the ECG signal, a parallel differential three-op-amp instrumentation amplifier with appropriate gain, low power consumption, low noise, high input impedance,...

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Abstract

Disclosed is an electrocardiogram (ECG) signal conditioning circuit. The ECG signal conditioning circuit comprises a primary amplification circuit, a zeroing circuit, a 50Hz wave-limiting circuit, a bandpass filtering circuit and a secondary amplification circuit. The primary amplification circuit performs linear amplification on ECG signals extracted from a human body surface; after zero drifts are inhibited through the zeroing circuit, the signals are transmitted to the wave-limiting circuit and the bandpass filtering circuit, and clutter interference signals are eliminated; and then the signals are sent to an A / D conversion portion for signal sampling through the secondary amplification circuit. The conditioning circuit has the advantages of stable output waveforms, small noise and high common-mode inhibition ratio and improves the acquisition precision of the ECG signals.

Description

technical field [0001] The invention relates to an electrocardiographic signal conditioning circuit, which is suitable for the biological field. Background technique [0002] The ECG signal is the performance of the electrical activity of the heart and is one of the good physiological indicators reflecting the life state of the human body. It can be used to detect various cardiovascular diseases such as arrhythmia, cardiomyopathy, myocardial infarction and myocardial ischemia. However, the ECG signal is a low-frequency weak signal in the background of strong noise, which has the characteristics of strong randomness and low frequency, and is easily disturbed by the internal noise of the detection system and external stimuli (environment, temperature). Only after a series of processing (filtering out noise and interference) can high-fidelity ECG information be obtained, providing an accurate and effective data source for further analysis and research of ECG information from a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/0428A61B5/308
Inventor 李福霞
Owner 李福霞
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