Electroencephalography acquisition system: Analog design

被引：6

作者：

Alkhorshid D.R. ^{[1
]}

Molaeezadeh S.F. ^{[1
]}

Alkhorshid M.R. ^{[2
]}

机构：

[1] Department of Electrical and Computer Engineering, Jundi-Shapur University of Technology, Dezful

[2] Department of Electrical Engineering, Islamic Azad University of Izeh, Izeh

来源：

Biomedical Instrumentation and Technology | 2020年 / 54卷 / 05期

关键词：

High pass filters - Electrophysiology - Electroencephalography - Anti-aliasing - Radio interference - Feedback amplifiers - Mergers and acquisitions;

D O I：

10.2345/0899-8205-54.5.346

中图分类号：

学科分类号：

摘要：

Electroencephalography (EEG) is a sensitive and weak biosignal that varies from person to person. It is easily affected by noise and artifacts. Hence, maintaining the signal integrity to design an EEG acquisition system is crucial. This article proposes an analog design for acquiring EEG signals. The proposed design consists of eight blocks: (1) a radio-frequency interference filter and electro-static discharge protection, (2) a preamplifier and second-order high-pass filter with feedback topology and an unblocking mechanism, (3) a driven right leg circuit, (4) two-stage main and variable amplifiers, (5) an eight-order anti-aliasing filter, (6) a six-order 50-Hz notch filter (optional), (7) an opto-isolator circuit, and (8) an isolated power supply. The maximum gain of the design is approximately 94 dB, and its bandwidth ranges from approximately 0.18 to 120 Hz. The depth of the 50-Hz notch filter is -35 dB. Using this filter is optional because it causes EEG integrity problems in frequencies ranging from 40 to 60 Hz. © Copyright AAMI 2020.

引用

页码：346 / 351

页数：5

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