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Electrocardiogram signal acquisition circuit

A signal acquisition and electrocardiogram technology, which is used in medical science, diagnosis, diagnostic recording/measurement, etc., can solve the problems of large motor offset voltage and difficulty in ECG signal extraction, and achieve the effect of simplifying the circuit structure.

Pending Publication Date: 2022-05-13
深圳列拓科技有限公司
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the range of motor imbalance voltage in the signal collected by the existing electrocardiogram signal acquisition circuit is too large, which leads to the difficulty of extracting the ECG signal itself. Therefore, the present invention proposes an electrocardiogram signal acquisition circuit

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Embodiment Construction

[0045] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention discloses an electrocardiogram signal acquisition circuit, which comprises a first capacitance amplifier and a second capacitance amplifier, and is characterized in that when the first capacitance amplifier is in a reset state, a first voltage difference between a common-mode voltage and a reference voltage is stored; when the reset state of the first capacitance amplifier is released, the difference value between the common-mode voltage and the reference voltage is a second voltage difference, and the first capacitance amplifier amplifies the increment between the second voltage difference and the first voltage difference; when the second capacitance amplifier is in a reset state, a third voltage difference between the common-mode voltage and the reference voltage is stored; when the reset state of the second capacitance amplifier is released, the difference value between the common-mode voltage and the reference voltage is a fourth voltage difference, and the second capacitance amplifier amplifies the increment between the fourth voltage difference and the third voltage difference; and the first capacitance amplifier and the second capacitance amplifier alternately enter a reset state and a reset release state. According to the invention, the influence of electrode offset voltage is eliminated, and the circuit structure is simplified.

Description

technical field [0001] The invention relates to the technical field of signal processing circuits, in particular to an electrocardiogram signal acquisition circuit. Background technique [0002] The ECG signal collected by the existing ECG (Electrocardiogram-electrocardiogram) signal acquisition circuit is as follows: figure 1 As shown, when the amplitude distribution of the ECG acquisition signal is 0-1.5V, the offset voltage of the electrode is plus or minus 300mv, but the ECG signal itself is only plus or minus 2.5 millivolts, so there is a large common-mode drift and Effects of electrode misalignment. [0003] The traditional ECG signal acquisition circuit such as figure 2 shown. The instrumentation amplifier is composed of op amp OPA1, op amp OPA2 plus resistor R1, resistor R2 and resistor R3. The positive input of op amp OPA1 is connected to the right-hand electrode RA, and the negative input of op amp OPA2 is connected to the left-hand electrode LA. The input and...

Claims

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Application Information

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IPC IPC(8): A61B5/318A61B5/319
CPCA61B5/318A61B5/319
Inventor 喻彪丁士璟高攀尹奇国
Owner 深圳列拓科技有限公司
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