新型脑电信号前置级放大电路设计

脑电信号检测中前置级放大电路是信号预处理中最关键的环节，其设计优劣直接关系到脑电数据采集系统的精度，在现有生物电放大器研究的基础上，改进并设计了一种符合脑电信号特征的新型高性能前置级放大电路，该电路避免了传统生物电放大电路冗繁的模拟滤波环节，结构简单，调试方便．文中对该电路作了详细的理论分析和实验论证，实验结果证明，该电路达到了设计要求，为脑电放大器及其它微弱生物电放大器的研制及发展提供了一个新思路．

New Design of Pre-amplification Circuit for EEG Signals

In the measurement of EEG signals ,the pre - amplification electrical signal of brain is the most importantant and key link. Whether the design is excellent or inferior is related to the electrical signal detection system of brain directly. The design of this circuit has been paid attention to by domestic and international expert all the time. On the basis of existing biological electricity amplifier which is studied, the authors consult the electric amplifier circuit of living beings designed , such as reference , improve and design a new-type and high performance electrical signal characteristic of brain in . The circuit has prevented the traditional design from enlarging the miscellaneous simulation of the circuit and straining the wave link, otherwise, this circuit is of simple structure , low cost, and convenient debugging. The paper has detailed theoritic analysis and experimental results to prove this circuit, which offered a new train of thought for reseach and development of brain electrical amplifier and other faint biological electricity amplifiers . This curcuit has be expected to win extensive application.