A CMOS IC for portable EEG acquisition systems

Abstract

This paper presents a monolithic low-power, low-noise analog front-end electroencephalogram (EEG) acquisition system. It draws only 500 /spl mu/A from a standard 9 V battery, making it suitable for use in portable systems. Although fabricated in a standard CMOS technology, using current feedback techniques it achieves a CMRR of 100 dB while the total input noise referred to input is kept as low as 1.5 /spl mu/V (RMS).