A power-efficient wireless system with adaptive supply control for deep brain stimulation

Hyung Min Lee, Hangue Park, Maysam Ghovanloo

Research output: Contribution to journalArticle

107 Citations (Scopus)

Abstract

A power-efficient wireless stimulating system for a head-mounted deep brain stimulator (DBS) is presented. A new adaptive rectifier generates a variable DC supply voltage from a constant AC power carrier utilizing phase control feedback, while achieving high AC-DC power conversion efficiency (PCE) through active synchronous switching. A current-controlled stimulator adopts closed-loop supply control to automatically adjust the stimulation compliance voltage by detecting stimulation site potentials through a voltage readout channel, and improve the stimulation efficiency. The stimulator also utilizes closed-loop active charge balancing to maintain the residual charge at each site within a safe limit, while receiving the stimulation parameters wirelessly from the amplitude-shift-keyed power carrier. A 4-ch wireless stimulating system prototype was fabricated in a 0.5-μm 3M2P standard CMOS process, occupying 2.25 mm2. With 5 V peak AC input at 2 MHz, the adaptive rectifier provides an adjustable DC output between 2.5 V and 4.6 V at 2.8 mA loading, resulting in measured PCE of 72 ~ 87%. The adaptive supply control increases the stimulation efficiency up to 30% higher than a fixed supply voltage to 58 ~ 68%. The prototype wireless stimulating system was verified in vitro.

Original languageEnglish
Article number6584038
Pages (from-to)2203-2216
Number of pages14
JournalIEEE Journal of Solid-State Circuits
Volume48
Issue number9
DOIs
Publication statusPublished - 2013

Keywords

  • Active charge balancing
  • Adaptive rectifier
  • Closed-loop supply control
  • Head-mounted deep brain stimulation
  • Implantable medical devices
  • Inductive power transfer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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