A 13µW 87dB dynamic range implantable ΔΣ modulator for full-spectrum neural recording

Jian Xu, Md Kafiul Islam, Shuo Wang, Zhi Yang

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Experiment analysis on in-vivo data sequences suggests a wide system dynamic range (DR) is required to simultaneously record local field potentials (LFPs), extra-cellular spikes, and artifacts/interferences. In this paper, we present a 13 μW 87 dB DR ΔΣ modulator for full-spectrum neural recording. To achieve a wide DR and low power consumption, a fully-differential topology is used with multi-bit (MB) quantization scheme and switched-opamp (SO) technique. By adopting a novel fully-clocked scheme, a power-efficient current-mirror SO is developed with 50% power saving, which doubles the figure-of-merit (FOM) over its counterpart. A new static power-less multi-bit quantizer with 96% power and 69% area reduction is also introduced. Besides, instead of metal-insulator-metal (MIM) capacitor, three high-density MOS capacitor (MOSCAP) structures are employed to reduce circuit area. Measurement results show a peak signal-to-noise and distortion ratio (SNDR) of 85 dB with 10 kHz bandwidth at 1.0 V supply, corresponding to an FOM of 45 fJ/conv.-step. which is implemented in a 0.18 μm CMOS

Keywords

  • ΔΣmodulator
  • full-spectrum recording
  • low voltage low power design
  • wide system dynamic range

PubMed: MeSH publication types

  • Journal Article
  • Research Support, Non-U.S. Gov't

Fingerprint Dive into the research topics of 'A 13µW 87dB dynamic range implantable ΔΣ modulator for full-spectrum neural recording'. Together they form a unique fingerprint.

  • Cite this