An Implantable Multichannel Stimulating System IC for Deep Brain Stimulation

Abstract

This paper proposes a newly designed deep brain stimulation(DBS) system which have selective multi-channels and enable to control electrical stimulating parameter widely for various experiments. To realize the proposed system, neural current stimulation chip, wireless data and power transmitter/receiver are developed, and additional charging circuit and memory block are composed to total set of system. The system receives inductive power to operate only receiver and data at 125 kb/s from a amplitude shift keyed (ASK) 2.5 MHz carrier to generate stimulus pulses. The current stimulation chip has 12-bits inputs to adjust stimulus pulse parameter, 3-bits inputs for channel enable and 1-bits to control chip operating. This chip which was fabricated using 0.35um CMOS process can generate biphasic stimulus pulse with wide range. The prototype implant system size without battery is 20mm x 30mm x 3mm.