A 0.0094mm                         2                         /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording

Luke Everson; Somnath Kundu; Gang Chen; Zhi Yang; Timothy J. Ebner; Chris H. Kim

doi:10.1109/BIOCAS.2018.8584754

A 0.0094mm ² /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording

Luke Everson
, Somnath Kundu
, Gang Chen
, Zhi Yang
, Timothy J. Ebner
, Chris H. Kim

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

A digital-intensive, low-area, time-based ADC optimized for in-situ neural recording is fabricated in a 65nm test chip and validated with in-vivo data. The intrinsic inversely proportional gain of a beat frequency based quantizer allows recording of sub-millivolt neural signals without any sophisticated amplifiers or filters. A low-area analog-front-end (AFE) is implemented with a standard digital logic inverter transimpedance amplifier and tunable low pass and high pass filters. The test chip achieves 20.9dB SNDR for a 1mVpp input at 416Hz with a bandwidth of 4.2 kHz and consumes 52μW at 0.8V. In-vivo evoked potentials and spontaneous activity were measured directly from a mouse cerebellum without any external components, validating the efficacy of the aggressive tradeoffs. These results are achieved in an area of 0.0094mm ² /channel, including on-chip AC coupling and filter passives, which makes this an attractive architecture for complete integration in ultra-high channel count neural recording systems.

Original language	English (US)
Title of host publication	2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781538636039
DOIs	https://doi.org/10.1109/BIOCAS.2018.8584754
State	Published - Dec 20 2018
Event	2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Cleveland, United States Duration: Oct 17 2018 → Oct 19 2018

Publication series

Name	2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings

Other

Other	2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018
Country/Territory	United States
City	Cleveland
Period	10/17/18 → 10/19/18

Bibliographical note

Funding Information:
This research was supported in part by NSF IGERT grant DGE-1069104 and NIH grant NS 18338.

Funding Information:
ACKNOWLEDGEMENTS: This research was supported in part by NSF IGERT grant DGE-1069104 and NIH grant NS 18338.

Publisher Copyright:
© 2018 IEEE.

Publisher link

10.1109/BIOCAS.2018.8584754

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Cite this

Everson, L., Kundu, S., Chen, G., Yang, Z., Ebner, T. J., & Kim, C. H. (2018). A 0.0094mm ² /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording. In 2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings Article 8584754 (2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/BIOCAS.2018.8584754

A 0.0094mm ² /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording. / Everson, Luke; Kundu, Somnath; Chen, Gang et al.
2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2018. 8584754 (2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Everson, L, Kundu, S, Chen, G, Yang, Z , Ebner, TJ & Kim, CH 2018, A 0.0094mm ² /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording. in 2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings., 8584754, 2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings, Institute of Electrical and Electronics Engineers Inc., 2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018, Cleveland, United States, 10/17/18. https://doi.org/10.1109/BIOCAS.2018.8584754

Everson L, Kundu S, Chen G, Yang Z , Ebner TJ , Kim CH. A 0.0094mm ² /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording. In 2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2018. 8584754. (2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings). doi: 10.1109/BIOCAS.2018.8584754

Everson, Luke ; Kundu, Somnath ; Chen, Gang et al. / A 0.0094mm ² /Channel Time-Based Beat Frequency ADC in 65nm CMOS for Intra-Electrode Neural Recording. 2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2018. (2018 IEEE Biomedical Circuits and Systems Conference, BioCAS 2018 - Proceedings).

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abstract = " A digital-intensive, low-area, time-based ADC optimized for in-situ neural recording is fabricated in a 65nm test chip and validated with in-vivo data. The intrinsic inversely proportional gain of a beat frequency based quantizer allows recording of sub-millivolt neural signals without any sophisticated amplifiers or filters. A low-area analog-front-end (AFE) is implemented with a standard digital logic inverter transimpedance amplifier and tunable low pass and high pass filters. The test chip achieves 20.9dB SNDR for a 1mVpp input at 416Hz with a bandwidth of 4.2 kHz and consumes 52μW at 0.8V. In-vivo evoked potentials and spontaneous activity were measured directly from a mouse cerebellum without any external components, validating the efficacy of the aggressive tradeoffs. These results are achieved in an area of 0.0094mm 2 /channel, including on-chip AC coupling and filter passives, which makes this an attractive architecture for complete integration in ultra-high channel count neural recording systems.",

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