基于右腿驱动技术的脑电信号放大器的设计

设计了高性能的脑电信号(EEG)放大器,将差分放大电路、右腿驱动电路应用于放大器的前置部分,有效消除共模信号干扰,通过前置放大器和两级后级放大器将EEG信号放大,通过设计并合理安置多个低通滤波器和50Hz陷波器,有效消除EEG信号中的高频干扰和工频干扰,在非屏蔽室的条件下能够有效检测到EEG信号.测试结果表明,放大器各个部分性能指标已达到设计要求,同时在测试者头皮采集到了实际的EEG信号,证明了设计的有效性.

EEG Signal Amplifier Design Based on Driven-Right-Leg Technology

A high-performance EEG signal amplifier was designed, where the differential amplifier circuit, driven-right-leg circuit and preamplifying parts in the designed amplifier can denoise the common-mode interference signals. With the EEG signal amplified by the preamplifier and 2-stage post-amplifier, two low-pass filters and two 50Hz traps were arranged reasonably in design to denoise the high/medium-frequency interference in EEG signal effectively, thus enabling the efficient EEG signal detection without shielded enclosure. Testing results showed that the performance of all parts of the amplifier comes up to the indices as required in design. The effectiveness of the design was proved by the real EEG signal sampled from the scalp of the detected person.