A fully-integrated mixed-signal neural processing module for implantable multi-channel cortical recording

A 64-channel neural processor has been developed for use in an implantable neural recording microsystem. In the Scan Mode, the processor is capable of detecting neural spikes using programmable positive, negative, or biphasic thresholds. Spikes are tagged with their associated channel addresses and formed into 18 b data words that are sent serially to the external host. In the Monitor Mode, two channels can be selected and viewed at high resolution for studies where the entire signal is of interest. The processor runs from a 3 V supply and a 2 MHz clock, with a channel scan rate of 64 kS/sec and an output bit rate of 2 Mbps.