Abstract
EEG (electroencephalogram) signal is an important biological signal, for it contains large amounts of biological electric information in human body. EEG has a large amount of applications covering wide areas, including adjuvant therapy, cognitive processes, brain disease diagnosis, rehabilitation medicine and military fields. With the improvement of signal process technology and integrated circuit design, the project acquiring EEG signal to analyze drain's information has been widely researched. This paper invented a low-cost circuit to detect EEG signal in BCI (brain computer interface) system. The low-cost circuit adopts the resistance capacitance coupled circuit, active shield driver and floating power supply, which has strong anti-interference ability and simple structure. This circuit is able to amplify the weak EEG signal precisely and filter the noise effectively. The simulation results proved the effectiveness of this method for EEG signal amplification, suppressing noise and extraction of low-frequency signal.
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