Wireless Multichannel Neural Recording With a 128 Mbps UWB Transmitter for an Implantable Brain Machine Interfaces
Simultaneous recordings of neural activity at large scale, in the long term and under bio safety conditions, can provide essential data. These data can be used to advance the technology for brain machine interfaces in clinical applications, and to understand brain function. For this purpose, we present a new multichannel neural recording system that can record up to 4096 channel (ch) electrocorticogram data by multiple connections of customized application specific integrated circuits (ASICs) The ASIC includes 64 ch low noise amplifiers, analog time division multiplexers, and 12 bit successive approximation register ADCs. Recorded data sampled at a rate of 1 kS/s are multiplexed with time division via an integrated multiplex board, and in total 51.2 Mbps of raw data for 4096 ch are generated. This system has an ultra wideband (UWB) wireless unit for transmitting the recorded neural signals. The ASICs, multiplex boards, and UWB transmitter unit are designed with the aim of implanting them. From preliminary experiments with a human body equivalent liquid phantom, we confirmed 4096 ch UWB wireless data transmission at 128 Mbps for distances below 20 mm
IEEE Transactions on Biomedical Circuits and Systems