Researchers are currently developing a system that can integrate more than 10,000 electrodes onto a small area on silicon probes.
The neural recording microsystems have evolved from single electrode systems in the 50s to the multi-electrode array or silicon probes that contains up to hundreds of electrodes. Researchers are currently developing system that can integrate more than 10,000 electrodes onto a small area. As the number of electrode increase, high data rate generated becomes a challenge. Most of the power in the recording circuits is consumed to drive the output pads. Even if we used wired connection, there are no standard cables that can carry this large amount of data and yet be lightweight and flexible for the animal to move in an unrestricted way. We are currently working on a closed-loop compressed sensing based recording device that utilizes a signal dependent dictionary to compress the recording signals as much as 20 times. When used in conjunction with spike detection block, this system can compress the transmission data by several decades, while consuming power on the order of nanowatt per electrode.