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An AC-Coupled Wideband Neural Recording Front-End With Sub-1 mm² × fJ/conv-step Efficiency and 0.97 NEF

Uran, Arda and Leblebici, Yusuf and Emami, Azita and Cevher, Volkan (2020) An AC-Coupled Wideband Neural Recording Front-End With Sub-1 mm² × fJ/conv-step Efficiency and 0.97 NEF. IEEE Solid-State Circuits Letters, 3 . pp. 258-261. ISSN 2573-9603. https://resolver.caltech.edu/CaltechAUTHORS:20200806-153947821

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Abstract

This letter presents an energy-and-area-efficient ac-coupled front-end for the multichannel recording of wideband neural signals. The proposed unit conditions local field and action potentials using an inverter-based capacitively coupled low-noise amplifier, followed by a per-channel 10-b asynchronous SAR ADC. The adaptation of unit-length capacitors minimizes the ADC area and relaxes the amplifier gain so that small coupling capacitors can be integrated. The prototype in 65-nm CMOS achieves 4× smaller area and 3× higher energy–area efficiency compared to the state of the art with 164 μm×40μm footprint and 0.78 mm²× fJ/conv-step energy-area figure of merit. The measured 0.65- μW power consumption and 3.1 - μVrms input-referred noise within 1 Hz–10 kHz bandwidth correspond to a noise efficiency factor of 0.97.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/lssc.2020.3013993DOIArticle
ORCID:
AuthorORCID
Uran, Arda0000-0002-8762-4494
Emami, Azita0000-0003-2608-9691
Additional Information:© 2020 IEEE. Manuscript received May 16, 2020; revised July 3, 2020; accepted July 30, 2020. Date of publication August 4, 2020; date of current version August 24, 2020. This work was supported in part by the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme under Grant 725594-time-data, and in part by Hasler Foundation under Project 16066. This article was approved by Associate Editor Paul Walsh.
Group:Heritage Medical Research Institute
Funders:
Funding AgencyGrant Number
European Research Council (ERC)725594
Hasler Foundation16066
Subject Keywords:AC coupling, front-end, inverter-based amplifier, monotonic switching, neural recording, successive approximation register (SAR) analog-to-digital converter (ADC), unit-length capacitor (ULC)
Record Number:CaltechAUTHORS:20200806-153947821
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200806-153947821
Official Citation:A. Uran, Y. Leblebici, A. Emami and V. Cevher, "An AC-Coupled Wideband Neural Recording Front-End With Sub-1 mm2×fJ/conv-step Efficiency and 0.97 NEF," in IEEE Solid-State Circuits Letters, vol. 3, pp. 258-261, 2020, doi: 10.1109/LSSC.2020.3013993.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104785
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Aug 2020 16:47
Last Modified:27 Aug 2020 22:08

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