Flexible EEG Electrodes with Embedded Pressure Sensors and Customized Interface Towards Comfortable Home EEG Monitoring.

To realize stable and comfortable dry electroencephalography (EEG) recording for home healthcare, a flexible pressure-sensitive electrode (PSE) is proposed, and a dedicated multi-channel pressure sensor interface is developed. The PSE monitors the pressure on the electrode during continuous EEG recording. With the PSE, stable but comfortable electrode-skin contact can be achieved. The analog front-end of the sensor interface is fabricated in 180-nm CMOS, occupying an active area of 0.25 mm. The flexible sensor exhibited a -2.5 kΩ/kPa sensitivity. The sensor interface enjoyed a large stimulus range of up to 2.65 mApp and showed a resolution of 0.047 - 8.0 mΩ/√Hz. It is digital-compatible, reconfigurable, and area-efficient, which can be migrated into various EEG acquisition integrated circuits and systems.