Low-power implantable microsystem intended to multichannel cortical recording

We present in this paper an implantable massively parallel cortical data acquisition system. The proposed embedded mixed-signal (analog/digital) processing units are intended to be integrated on one chip, which will be flipped and connected on the top of a microelectrode array. Each channel is composed of a Chopper stabilized (CHS) low-power front-end to remove the 1/f noise, and a mixed-signal compression module using an analog wavelet transform (WT) processor that covers the entire neural signals bandwidth. The proposed front-end is based on a new rail-to-rail preamplifier topology and its circuit simulation under 0.18 /spl mu/m CMOS process demonstrates a power dissipation less than 25 /spl mu/W per channel. The main application of this medical device is to record action potentials evoked by visual stimuli, but it can be useful for several other cortical recording purposes.