Title :
A Wireless Implantable Microsystem for Multichannel Neural Recording
Author :
Sodagar, Amir M. ; Wise, Kensall D. ; Najafi, Khalil
Author_Institution :
Res. Center for Wireless Integrated Microsyst., Univ. of Michigan at Ann Arbor, Ann Arbor, MI, USA
Abstract :
An implantable microsystem capable of recording neural activity simultaneously on 64 channels is reported. This system receives power and setup data through an inductive wireless link, and wirelessly transmits the recorded neural information to an external interface. The microsystem is capable of detecting spike occurrences, as well as digitizing the spike waveforms on any channel with 8-bit resolution. Signals are amplified by 60 dB with a programmable bandwidth from < 100 Hz to 10 kHz. The input-referred noise is 8 muVrms. The channel scan rate for spike detection is 62.5 kS/s using a 2-MHz clock. The system dissipates 14.4 mW at 1.8 V, weighs 275 mg, and measures 1.4 cm times 1.55 cm.
Keywords :
bioMEMS; bioelectric potentials; biomedical electronics; biomedical equipment; biomedical measurement; biomedical telemetry; brain; cellular biophysics; neurophysiology; prosthetics; wireless channels; CMOS circuits; action potentials; biomedical electronics; brain; channel scan rate; clock; external interface; frequency 2 MHz; inductive wireless link; input-referred noise; mass 275 mg; multichannel neural recording; neural information recording; power 14.4 mW; signal amplification; single-unit extracellular neural activity; size 1.4 cm; size 1.55 cm; spike detection; spike occurrences; spike waveform digitization; telemetry powering; voltage 1.8 V; wireless implantable microsystem; Biomedical electronics; mixed-signal CMOS circuits; neural recording; telemetry powering; wireless interfacing;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2009.2029957
