A low-power multi-frequency chopper-stabilized readout with time-domain delta-sigma modulator suitable for neural recording

Mikiyoshi Mikawa, Kenta Yagi, Kazuki Itakura, Leo Onuki, Nobuhiko Nakano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents a readout for multi-channel neural recording. The proposed architecture is implemented with a system-level frequency-division multiplexing technique and a time-domain delta-sigma modulator. Subthreshold region operation and the time-domain delta-sigma modulator achieves a reduction of the current dissipation. The multiplexing technique in the frequency domain enhances the power efficiency by sharing an instrumentation amplifier and the delta-sigma modulator in each channel. The proposed circuit employs a pulse-width summation technique to achieve frequency-division multiplexing in the time-domain delta-sigma modulator. The multiplexing technique of multiple frequency chopper stabilization can eliminate flicker noise and offsets. The proposed two-channel readout occupies 0.067 mm2 per channel and is designed with 0.18-µm CMOS technology. The spurious-free dynamic range is up to 50 dB in a bandwidth of 625 Hz with a low power consumption of 520 nW per channel.

Original languageEnglish
Title of host publicationICECS 2020 - 27th IEEE International Conference on Electronics, Circuits and Systems, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728160443
DOIs
Publication statusPublished - 2020 Nov 23
Event27th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2020 - Glasgow, United Kingdom
Duration: 2020 Nov 232020 Nov 25

Publication series

NameICECS 2020 - 27th IEEE International Conference on Electronics, Circuits and Systems, Proceedings

Conference

Conference27th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2020
CountryUnited Kingdom
CityGlasgow
Period20/11/2320/11/25

Keywords

  • Electroencephalogram (EEG)
  • Gated ring oscillator (GRO)
  • Multi-channel recording
  • Multi-frequency chopping
  • Subthreshold region operation
  • Time-to-digital converter (TDC)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'A low-power multi-frequency chopper-stabilized readout with time-domain delta-sigma modulator suitable for neural recording'. Together they form a unique fingerprint.

Cite this