A frequency shaping neural recorder with 3 pF input capacitance and 11 plus 4.5 bits dynamic range

Jian Xu, Tong Wu, Wentai Liu, Zhi Yang

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

This paper presents a frequency-shaping (FS) neural recording architecture and its implementation in a 0.13 μ m CMOS process. Compared with its conventional counterpart, the proposed architecture inherently rejects electrode offset, increases input impedance 5-10 fold, compresses neural data dynamic range (DR) by 4.5-bit, simultaneously records local field potentials (LFPs) and extracellular spikes, and is more suitable for long-term recording experiments. Measured at a 40 kHz sampling clock and {pm} 0.6 V supply, the recorder consumes 50 μW/ch, of which 22 μ W per FS amplifier, 24 μ W per buffer, 4 μ W per 11-bit successive approximation register analog-to-digital converter (SAR ADC). The input-referred noise for LFPs and extracellular spikes are 13 μ Vrms and 7 μVrms, respectively, which are sufficient to achieve high-fidelity full-spectrum neural data. In addition, the designed recorder has a 3 pF input capacitance and allows '11+4.5'-bit neural data DR without system saturation, where the extra 4.5-bit owes to the FS technique. Its figure-of-merit (FOM) based on data DR reaches 36.0 fJ/conversion-step.

Original languageEnglish (US)
Article number6762813
Pages (from-to)510-527
Number of pages18
JournalIEEE transactions on biomedical circuits and systems
Volume8
Issue number4
DOIs
StatePublished - Aug 2014

Keywords

  • Frequency-shaping
  • high impedance
  • low-power low-noise design
  • neural recorder
  • wide data dynamic range

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