通用串行总线脑电信号采集电路设计

Design of EEG Acquisition Circuit Based on USB

脑电信号的准确采集对于研究人脑活动、诊断疾病至关重要。针对脑电信号的特征,设计出使用16路电极提取脑电信号,采用高精度仪用放大器实现三级放大,设计有源双T陷波电路来抑制50 Hz工频干扰,设计光电隔离电路和16位A/D转换电路及USB接口电路。该电路实现了脑电数据的准确采集、高速传输和实时处理,有效解决了传统脑电数据采集系统速度慢,处理功能简单,数据存储量小,连接复杂等缺陷,满足了实际需要。

EEG accurate acquisition is very important for the study of the human brain and to the diagnosis of disease. Aiming at the characteristics of EEG,The use of 16 electrodes is designed to extract EEG,highprecision amplifier is used to amplify EEG,active two- notch T circuit is designed to suppress 50 Hz frequency interference,optical isolation circuit are also designed, 16 b A/D converter circuit and USB interface circuit are also designed. This circuit has realized EEG data accurate acquisition,high- speed transmission and real- time processing, traditional EEG acquisition system deficiencies have solved and to meet the actual needs.