European research institutions Imec and Holst Centre have jointly unveiled a mobile EEG system that is capable of continuously streaming live brain wave data to a receiving computer that’s up to 10 meters away. The system uses Ag/AgCl dry electrodes, which at times can be uncomfortable, but the potential for ambulatory monitoring, as well as research and consumer applications, is great.
At the heart of the system is imec’s 8-channel ultra-low-power analog readout ASIC (application-specific integrated circuit). The ultra-low power readout ASIC consumes only 200µW and features high common mode rejection ratio (CMRR) of 120dB and low noise (input referred noise of 55nV/√Hz). These performances are achieved at high input impedance (1GΩ), which makes it compatible with the use of dry electrodes. The electronics, including ASIC, radio, and controller chips are integrated in a small wireless EEG system of 25mmx35mmx5mm dimensions, that can easily be embedded in headsets, helmets or other accessories. The signal to noise ratio of the system is 25dB on real EEG signals. The entire system consumes only 3.3mW for continuous recording and wireless transmission of 1 channel, and 9.2mW for 8 channels. This gives between 1.5 to 4 days of autonomy on a small 100mAh Li-ion battery, depending on the mode of operation.
Full story: Imec and Holst Centre bring brain wave monitoring to your home…