Design Of EEG Acquisition System Based On ADS1298 And FPGA

EEG is an important bioelectric signal,which contains abundant physiological and pathological information.The widespread concern of the EEG’s research has been aroused in the world.More and more researchers are devoted to the study of EEG.EEG acquisition is generally through a dedicated electrode,the electrode output of the weak EEG after amplification,isolation,filtering,and then record and processing analysis.This thesis first analyzes the research status and development trend of EEG,and then introduces a set of EEG signal acquisition system based on ADS 1298 and FPGA in detail.The system has the advantages of high integration,high speed,flexibility,high practicability specialty.In line with the development trend of modern EEG research to meet the new requirements of modern EEG research.EEG is very weak,effective frequency of EEG signals mainly concentrated in the 0.5-50Hz,amplitude between 10-100uV,and highly vulnerable to the human body and the external signal interference.In order to collect accurate EEG signals,the system uses ADS 1298 as the A/D chip and FPGA as the system processor to design the analog filter circuit.The system in the biological electrode in contact with the skin under good conditions,the collected EEG signals through the analog filter circuit processing,the use of 24-bit A/D will be processed signals into digital,the processor FPGA to achieve FIR filtering And EMD algorithm,the read EEG data for algorithm analysis and processing,and then under the control of FPGA data sent to the host computer through the WIFI module,and ultimately the acquisition and transmission of EEG signals.After experimental testing of EEG acquisition system can accurately collect EEG signals,and to achieve the signal processing.