An inductively powered scalable 32-channel wireless neural recording system-on-a-chip for neuroscience applications

Seung Bae Lee, Hyung Min Lee, Mehdi Kiani, Uei Ming Jow, Maysam Ghovanloo

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

We present an inductively powered 32-channel wireless integrated neural recording (WINeR) system-on-a-chip (SoC) to be ultimately used for one or more small freely behaving animals. The inductive powering is intended to relieve the animals from carrying bulky batteries used in other wireless systems, and enables long recording sessions. The WINeR system uses time-division multiplexing along with a novel power scheduling method that reduces the current in unused low-noise amplifiers (LNAs) to cut the total SoC power consumption. In addition, an on-chip high-efficiency active rectifier with optimized coils help improve the overall system power efficiency, which is controlled in a closed loop to supply stable power to the WINeR regardless of the coil displacements. The WINeR SoC has been implemented in a 0.5-μm standard complementary metal oxide semiconductor process, measuring 4.9 × 3.3 mm2 and consuming 5.85 mW at ±1.5 V when 12 out of 32 LNAs are active at any time by power scheduling. Measured input-referred noise for the entire system, including the receiver located at 1.2 m, is 4.95 μV rms in the 1 Hz∼10 kHz range when the system is inductively powered with 7-cm separation between aligned coils.

Original languageEnglish
Article number5643255
Pages (from-to)360-371
Number of pages12
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume4
Issue number6 PART 1
DOIs
Publication statusPublished - 2010 Dec

Keywords

  • Implantable microelectronic devices
  • inductive power transmission
  • neural recording
  • system-on-a-chip (SoC)

ASJC Scopus subject areas

  • Biomedical Engineering
  • Electrical and Electronic Engineering

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