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Proposed AFE: (a) A cross-sectional view of the envisioned fully implantable BSA circuit, enclosed within a skull unit module. The BSA circuit is connected to a subdurally implanted high-density (HD)-ECoG electrode grid that senses brain signals. (b) Block diagram of the structure showing the brain interface electrodes with their corresponding impedances and BSA comprised of an array of fully differential amplifiers, serializer and buffer.
