A 6.8µW AFE for Ear EEG Recording with Simultaneous Impedance Measurement for Motion Artifact Cancellation

Wearable electroencephalography (EEG) systems can monitor neurological activity, enable new brain-computer interfaces and help users communicate with assistive devices. To facilitate ambulatory EEG recording, recent work has incorporated dry electrodes into wearable headsets and earbuds [1], [2]. Dry electrodes have superior ease-of-use over wet electrodes that require abrasive skin preparation. However, due to their high electrode-skin impedance (ESI), dry electrode wearables are susceptible to motion artifacts.