Managing cross-talk, thermal dissipation, and microvolt noise in intracortical silicon arrays.
When thousands of electrodes share silicon shanks with sub-20 micron spacing, capacitive cross-talk distorts extracellular action potentials. Active shielding and differential current-mode sensing attenuate cross-talk by over 42 dB.
Brain tissue is extraordinarily sensitive to heating; guidelines limit temperature rises to under 1°C. Front-end ASICs are engineered with power budgets below 15 microwatts per channel.