A 5.7kfps Fast Neural Electrical Impedance Tomography IC Based on Incremental Zoom Structure with Baseline Cancellation for Peripheral Nerve Monitoring Systems

Fast electrical impedance tomography (EIT) can localize and record neural activities of peripheral nerves in real time, but prior EIT systems do not support high enough frame rate (<500fps) to catch neural activities. Towards the real-time neural EIT, we propose a power- and hardware-efficient EIT system based on baseline-cancelling incremental zoom structure with $47\mu \mathrm{W}$ and $0.055\text{mm}^{2}/\text{ch}$, and a novel image update scheme, focused refresh, boosting the frame rate to 5.7kfps.