关键词: 脑电, 传感器, 脑电调理芯片

Abstract: Microchips applied for sensing low-voltage and low-frequency micro electroencephalogram (EEG) signals are very important for constructing wearable and portable EEG micro-devices and micro-systems. The EEG sensing microchips are very critical for medicine, neuroscience, brain-computer interface (BCI) and other scientific researches. The EEG sensors could detect the weak and low-frequency extra cranial scalp EEG signals sensitively, accurately, safely, reliably and conveniently. Then, the sensed weak EEG signals are fed into the post-sensor conditioning circuits. Effective post-sensor conditioning chips can amplify the sensed weak EEG signals received from the pre-sensors, eliminate out-of-band irrelevant signals, reduce different noises. Relied on the biological-ADC, the amplified EEG signals are converted into digital signals. EEG signals are packed and wireless transmitted to remote terminals. And, EEG sensing reliability will affect effective developments of EEG algorithms at remote receiving terminals directly. As the urgent requirements of portable or wearable micro-devices and micro-systems, the developments of EEG sensors and post-sensor conditioning microchips become very critical. The researches of EEG micro sensors and post-sensor conditioning microchips at home and abroad are reviewed, EEG signals perception through the designed EEG sensors, which are also namely EEG electrodes; and the post-sensor conditioning microchips. The exploitation of EEG sensors and microchips and look ahead for the future is summarized.

Key words: electroencephalogram, sensor, electroencephalogramconditioningchip