A Fully Integrated RF-powered Energy-replenishing Current-controlled Stimulator

Sohmyung Ha, Chul Kim, Jiwoong Park, Gert Cauwenberghs, Patrick Mercier

Research output: Contribution to journalArticle

Abstract

This paper presents a fully-integrated current-controlled stimulator that is powered directly from on-chip coil antenna and achieves adiabatic energy-replenishing operation without any bulky external components. Adiabatic supply voltages, which can reach a differential range of up to 7.2 V, are directly generated from an on-chip 190-MHz resonant LC tank via a self-cascading/folding rectifier network, bypassing the losses that would otherwise be introduced by the 0.8 V system supply-generating rectifier and regulator. The stimulator occupies 0.22 mm<formula><tex>$^2$</tex></formula> in a 180 nm silicon-on-insulator (SOI) process, and produces differential currents up to 145 &#x03BC;A. Using a charge replenishing scheme, the stimulator redirects the charges accumulated across the electrodes to the system power supplies for 63.1% of stimulation energy recycling. To benchmark the efficiency of stimulation, a figure of merit termed the Stimulator Efficiency Factor (SEF) is introduced. The adiabatic power rails and energy replenishment scheme enabled our stimulator to achieve an SEF of 6.0.

Original languageEnglish (US)
JournalIEEE Transactions on Biomedical Circuits and Systems
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Electric power systems
Rails
Recycling
Antennas
Silicon
Electrodes
Electric potential

Keywords

  • Adiabatic
  • adiabatic stimulation
  • BRAIN Initiative
  • electrocorticography
  • Electrodes
  • Impedance
  • Implants
  • neural stimulation
  • neural technology
  • neuromodulation
  • Neurons
  • Rails
  • System-on-chip

ASJC Scopus subject areas

  • Biomedical Engineering
  • Electrical and Electronic Engineering

Cite this

A Fully Integrated RF-powered Energy-replenishing Current-controlled Stimulator. / Ha, Sohmyung; Kim, Chul; Park, Jiwoong; Cauwenberghs, Gert; Mercier, Patrick.

In: IEEE Transactions on Biomedical Circuits and Systems, 01.01.2018.

Research output: Contribution to journalArticle

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