A 2.36μW/Ch CMOS 8-Channel EEG Acquisition Unit with Input Protection Circuits for Applications Under Transcranial Direct Current Stimulation

Wu, Chung‐Yu; Huang, Chi-Wei; Tsai, Tzung-Lin

doi:10.1109/biocas.2019.8919120

Cited by 6 publications

(1 citation statement)

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“…Historically, different designs have been proposed for handling these challenges. [10][11][12][13][14][15][16][17][18][19][20] All of these designs aim to reduce the imperfections of analog signal conditioning and to ensure signal integrity. Similarly, this article presents a system that would help resolve the above-mentioned challenges.…”

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confidence: 99%

Analysis : Electroencephalography Acquisition System: Analog Design

Alkhorshid¹,

Molaeezadeh²,

Alkhorshid³

2020

Biomedical Instrumentation & Technology

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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.

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