A Power-Efficient Multichannel Neural Stimulator Using High-Frequency Pulsed Excitation From an Unfiltered Dynamic Supply

MN van Dongen, WA Serdijn

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

This paper presents a neural stimulator system that employs a fundamentally different way of stimulating neural tissue compared to classical constant current stimulation. A stimulation pulse is composed of a sequence of current pulses injected at a frequency of 1 MHz for which the duty cycle is used to control the stimulation intensity. The system features 8 independent channels that connect to any of the 16 electrodes at the output. A sophisticated control system allows for individual control of each channel's stimulation and timing parameters. This flexibility makes the system suitable for complex electrode configurations and current steering applications. Simultaneous multichannel stimulation is implemented using a high frequency alternating technique, which reduces the amount of electrode switches by a factor 8. The system has the advantage of requiring a single inductor as its only external component. Furthermore it offers a high power efficiency, which is nearly independent on both the voltage over the load as well as on the number of simultaneously operated channels. Measurements confirm this: in multichannel mode the power efficiency can be increased for specific cases to 40% compared to 20% that is achieved by state-of-the-art classical constant current stimulators with adaptive power supply.
Original languageEnglish
Pages (from-to)61-71
Number of pages11
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume10
Issue number1
DOIs
Publication statusPublished - 24 Nov 2014

Keywords

  • neural stimulation
  • Current steering
  • dynamic power supply
  • HVCMOS
  • implantable medical devices
  • low power
  • multichannel

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