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An Automatic Action Potential Detector for Neural Recording Implants

Authors
  • Barati, Saeid1
  • Yavari, Mohammad1
  • 1 Amirkabir University of Technology (Tehran Polytechnic), Integrated Circuits Design Laboratory, Department of Electrical Engineering, 424 Hafez Ave., Tehran, 15914, Iran , Tehran (Iran)
Type
Published Article
Journal
Circuits, Systems, and Signal Processing
Publisher
Springer US
Publication Date
Oct 22, 2018
Volume
38
Issue
5
Pages
1923–1941
Identifiers
DOI: 10.1007/s00034-018-0969-3
Source
Springer Nature
Keywords
License
Yellow

Abstract

In this paper, a low-power CMOS analog automatic action potential (AP) detector is proposed for wireless neural recording implants. The proposed AP detector is based on comparing the neural input signal with an analog threshold level. The threshold level is obtained by calculating the root mean square value of the neural input signal. In order to generate the threshold voltage level, the AP detector incorporates a continuous-time (CT) sigma-delta (Σ∆) modulator in its analog signal processing section. This structure benefits from the combination of a CT Σ∆ modulator and a single-bit DAC as the multiplier to reduce the power consumption. Although in contrast to the traditional methods, the required circuits are not biased in the subthreshold region, the total power consumption is reduced. The proposed AP detector is designed in TSMC 90 nm CMOS technology and consumes 11.8 µW from a single 1-V power supply. It is worth mentioning that the utilized CT Σ∆ modulator can also be used in the analog-to-digital converter to significantly reduce both the power consumption and silicon area of the complete neural recording system.

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