Electronic Analog Front End for Brain-Computer Interface

The scientific and engineering problems of construction of analog front end of brain-computer interface are discussed. The currently known schematic solutions of such problems as high impedance of the investigated object, contact phenomena at the skin-electrode interface, leading to the occurrence of high-amplitude trends, high noise level at small amplitudes of the useful signal, as well as problems specific to the construction of BCI systems due to the need of compact ergonomic arrangement of devices, maximum reduction of power consumption, influence of motor artifacts. The results of creating analog front end on the basis of specialized high-integration microcircuits developed by Texas Instruments are presented. It is shown that the developed device allows to substantially neutralize the influence of the listed problems on the quality of recording the signals of the electroencephalogram.