The Design And Research Of A Neuronal Activity Acquisition System

BCI (brain-computer interface), It is to establish a direct connection between the animal brain and external devices, mainly used in medical rehabilitation, or functional areas of human assistance. In the BCI implementation, Brain electrical signal acquisition instrument is a key factor that determines the accuracy of the BCI performance. Therefore, the development of brain science is largely dependent on the level of development of signal acquisition devices. At present domestic and foreign has many factory production each type brain electricity gathering instrument, regardless of has the quite good showing from the precision or antijamming ability, has met the medical recovery research need basically. But they all have several common drawbacks:difficult to operate, complex, bulky and inconvenient, limiting activities, and expensive.Based on the analysis of domestic and international situation and development trend of Brain electrical signal acquisition, I have done a lot of work.The thesis is divided into animal physiological and experimental basis, the analog circuit in front of system design, PSoC design, system power supply design and of Brain electrical signal display and analysis five section in detail describes the design process of the entire system. Finally elaborated overall system's innovation and the existence insufficiency have built the good foundation for system's consummation and the improvement.In the system unit, the front-end circuit is design to achieve the first stage instrumentation amplifier INA118, and then design the high and low pass filter and 50Hz notch module and the second and third level amplification, the system uses single power supply mode to simplify the structure. All components are equipped with the smallest package. The size is small. The weight is light. And will not give a great burden to the experimental animals. The communication part uses the wireless USB module to realize, and the animal can move freely. LABVIEW software is used to display process and analyze the signal.The system is designed to compensate for the shortcomings of previous devices, to achieve a simplified structure, easy operation, compact size, easy to move freely.