Characterization and Redesign of the AFIT Multielectrode Array.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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Since 1978, faculty and graduate students from the Air Force Institute of Technology AFIT have been working on an implantable circuit array that can record visual signals from the brain or stimulate the brain. In the current design the circuit is a 16 x 16 array of pads, each pad being 160 x 160 micrometers with 250 micrometers spacing with an L shaped reference pad used as a ground reference. The array is multiplexed so that only one IO line is required to access all 256 pads. This research was twofold first to analyze the existing circuit and identify sources for noise and then to redesign the circuit with the intent of reducing noise and power consumption. As a result of the research, a new 16 x 17 array has been developed. The new design incorporates new demultiplexing and synchronizing circuitry. The new circuitry exhibits lower noise and consumes much less power. The L shaped reference pad has been removed-instead each pad and the pad to its right are sampled concurrent1y-one as the sample and one as a reference.
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