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A front-end processing circuit for physiological electrical signal acquisition

A front-end processing and electrical signal technology, applied in the electronic field, can solve problems such as large noise and signal distortion, and achieve the effects of suppressing power frequency noise, increasing common-mode rejection ratio, and improving matching

Active Publication Date: 2019-08-02
NANJING UNIV 5D TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For different physiological electrical signals, if the frequency response of the front-end of the acquisition circuit cannot be in the appropriate range, it will bring great pressure to the back-end processing circuit, resulting in signal or distortion, or large noise

Method used

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  • A front-end processing circuit for physiological electrical signal acquisition
  • A front-end processing circuit for physiological electrical signal acquisition
  • A front-end processing circuit for physiological electrical signal acquisition

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] figure 1 It is a schematic structural diagram of a conventional circuit scheme for positive and negative input bias voltages in a differential circuit. figure 1 In the circuit scheme, due to the difference in resistance value in engineering, there is still a difference of δ% under ideal conditions. In this case, the resistance R used for voltage division can reach a difference of up to 2δ%. The bias voltages are:

[0020]

[0021]

[0022] ΔV z_dc =V z1_dc -V z2_dc =δ×AVDD (3)

[0023] figure 1 In the circuit scheme in , under the condition that the difference of the resistance value is δ% and the capacitance value is δC%, set S=jω, and the bias voltages when the input is an AC signal are:

[0024]

[0025]

[0026]

[0027] figure 2 It is a schematic diagram of the circuit structure of the front-end processing ci...

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Abstract

The invention discloses a front-end processing circuit for physiological electric signal collection. The circuit comprises a left collection unit, a right collection unit, a simulation power source AVDD and an integrated ADC. Electric signals collected by the left collection unit and the right collection unit are connected through two capacitors C1 and C2 with the identical capacitance, a bias voltage Vz is obtained after voltage partitioning is performed on the simulation power source AVDD by two resistors R3 and R4, the Vz is connected to the rear portions of the capacitors C1 and C2 through two identical impedance devices Z1 and Z2 separately, and the electrical signals processed by the circuit are output after being amplified by the integrated ADC. According to the scheme, the circuit compatibility can be greatly improved, the collection front-end common mode rejection ratio can be increased, and the human power frequency noise can be effectively restrained. Meanwhile, the frequency response of the collection front-end can be flexibly controlled, and the circuit can be widely applied to the field of collection of various weak signals.

Description

technical field [0001] The electronic field of the present invention particularly relates to a front-end processing circuit for collecting physiological electric signals. Background technique [0002] When collecting common physiological electrical signals such as electrocardiogram (ECG), myoelectricity (EMG), and brain electricity (EEG), due to the influence of human physiological characteristics including breathing and exercise, the collected physiological electrical signals will produce large The baseline drift affects the processing and analysis of the signal at the back end of the circuit. In order to avoid baseline drift and increase the input impedance of the front end of the acquisition circuit, a method of adding bias voltages to the positive and negative terminals of the differential circuit is commonly used. [0003] Since it is difficult to ensure the consistency of the resistance value of the bias voltage divider resistor during engineering, the bias voltage at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/04A61B5/0402A61B5/0476A61B5/0488
CPCA61B5/7203A61B5/7207A61B5/7225A61B5/24A61B5/318A61B5/369A61B5/389
Inventor 张丽敏郭良志罗时礼丁建文王军李想
Owner NANJING UNIV 5D TECH
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