An EEG Acquisition System with Dynamic DC Suppression
GAO Dong-rui
LIU Tie-jun
CAI Jia
SHI Xun
DING Chao
XU Peng
YAO De-zhong
Key Laboratory for Neurolnformation of Ministry of Education,School of Life Science and Technology,University of Electronics Science and Technology of China,Chengdu Sichuan 610054,China
摘要：A three op-amps instrumentation amplifier(I.A)is one of the most important segments in the electroencephalographic(EEG)acquisition system,which is used to suppress the interference of the common mode noise.However,electrode and op-amps offset voltages could saturate the I.A,so the ability of noise suppression for the I.A might be limited.To compensate for the electrode and op-amps offset voltages and improve the property of the I.A,the optical-isolated technology was used in the present study.This paper described the theory of DC suppression and employed the simulation software(i.e.Multisim10.0.)to demonstrate the constant＜urrent source of the optical-isolated device comprised of general-purpose optocouplers.Using this technology we designed and tested an EEG acquisition system.During the test,a constant current was generated by the optocoupler(the MOTOROLA 4N35)when DC offset voltages from 0 to 15 mV were imposed on the input signal in the EEG acquisition system and the value of load resistance in the optical-isolated device was from 3 k to 15 kom.We also found that the IA with the gain of 857 could effectively reject a DC input range of±15mV.And An EEG signal is obtained by the EEG acquisition system,and a CMRR of 104.5 dB was achieved without trimmings.
机标关键词：dynamicsystemwithacquisitionsuppression
分类号：R318(医用一般科学)
论文发表日期：2022-06-30
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：6( 87-92 )
英文信息