A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording

Elliot Greenwald; Ernest So; Mohsen Mollazadeh; Christoph Maier; Ralph Etienne-Cummings; Nitish Thakor; Gert Cauwenberghs

doi:10.1109/BioCAS.2015.7348309

A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording

Elliot Greenwald, Ernest So, Mohsen Mollazadeh, Christoph Maier, Ralph Etienne-Cummings, Nitish Thakor, Gert Cauwenberghs

School of Medicine

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

2 Scopus citations

Abstract

We present a 4-channel integrated biopotential analog-To-digital converter (bioADC) for electrocortical recording in 180nm CMOS. The bioADC directly transduces microvolt biopotentials into a digital representation without a voltage-Amplification stage. Each channel comprises a continuous-Time first-order ΔΣ modulator with OTA input and current feedback, followed by a second-order comb-filter decimator. Powered from a 1.5V supply, the analog and digital circuits in each channel draw 2.1uA and 1.4uA of supply current, respectively. The bioADCs achieve an SNR of 57dB and a SFDR or 63.5dB, for 9-b ENOB. Intracranial EEG recordings from an anesthetized rat are shown and compared to simultaneous recordings from a commercial reference system to validate performance in-vivo. The micropower operation and direct digital readout make this circuit ideally suited for closed-loop neuromodulation applications.

Original language	English (US)
Title of host publication	IEEE Biomedical Circuits and Systems Conference
Subtitle of host publication	Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781479972333
DOIs	https://doi.org/10.1109/BioCAS.2015.7348309
State	Published - Dec 4 2015
Event	11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015 - Atlanta, United States Duration: Oct 22 2015 → Oct 24 2015

Publication series

Name	IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings

Other

Other	11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015
Country/Territory	United States
City	Atlanta
Period	10/22/15 → 10/24/15

ASJC Scopus subject areas

Biotechnology
Instrumentation
Biomedical Engineering
Electrical and Electronic Engineering

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10.1109/BioCAS.2015.7348309

Cite this

Greenwald, E., So, E., Mollazadeh, M., Maier, C., Etienne-Cummings, R., Thakor, N., & Cauwenberghs, G. (2015). A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording. In IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings Article 7348309 (IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/BioCAS.2015.7348309

A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording. / Greenwald, Elliot; So, Ernest; Mollazadeh, Mohsen et al.
IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2015. 7348309 (IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings).

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

Greenwald, E, So, E, Mollazadeh, M, Maier, C, Etienne-Cummings, R, Thakor, N & Cauwenberghs, G 2015, A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording. in IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings., 7348309, IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings, Institute of Electrical and Electronics Engineers Inc., 11th IEEE Biomedical Circuits and Systems Conference, BioCAS 2015, Atlanta, United States, 10/22/15. https://doi.org/10.1109/BioCAS.2015.7348309

Greenwald E, So E, Mollazadeh M, Maier C, Etienne-Cummings R, Thakor N et al. A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording. In IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2015. 7348309. (IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings). doi: 10.1109/BioCAS.2015.7348309

Greenwald, Elliot ; So, Ernest ; Mollazadeh, Mohsen et al. / A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording. IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2015. (IEEE Biomedical Circuits and Systems Conference: Engineering for Healthy Minds and Able Bodies, BioCAS 2015 - Proceedings).

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abstract = "We present a 4-channel integrated biopotential analog-To-digital converter (bioADC) for electrocortical recording in 180nm CMOS. The bioADC directly transduces microvolt biopotentials into a digital representation without a voltage-Amplification stage. Each channel comprises a continuous-Time first-order ΔΣ modulator with OTA input and current feedback, followed by a second-order comb-filter decimator. Powered from a 1.5V supply, the analog and digital circuits in each channel draw 2.1uA and 1.4uA of supply current, respectively. The bioADCs achieve an SNR of 57dB and a SFDR or 63.5dB, for 9-b ENOB. Intracranial EEG recordings from an anesthetized rat are shown and compared to simultaneous recordings from a commercial reference system to validate performance in-vivo. The micropower operation and direct digital readout make this circuit ideally suited for closed-loop neuromodulation applications.",

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N2 - We present a 4-channel integrated biopotential analog-To-digital converter (bioADC) for electrocortical recording in 180nm CMOS. The bioADC directly transduces microvolt biopotentials into a digital representation without a voltage-Amplification stage. Each channel comprises a continuous-Time first-order ΔΣ modulator with OTA input and current feedback, followed by a second-order comb-filter decimator. Powered from a 1.5V supply, the analog and digital circuits in each channel draw 2.1uA and 1.4uA of supply current, respectively. The bioADCs achieve an SNR of 57dB and a SFDR or 63.5dB, for 9-b ENOB. Intracranial EEG recordings from an anesthetized rat are shown and compared to simultaneous recordings from a commercial reference system to validate performance in-vivo. The micropower operation and direct digital readout make this circuit ideally suited for closed-loop neuromodulation applications.

AB - We present a 4-channel integrated biopotential analog-To-digital converter (bioADC) for electrocortical recording in 180nm CMOS. The bioADC directly transduces microvolt biopotentials into a digital representation without a voltage-Amplification stage. Each channel comprises a continuous-Time first-order ΔΣ modulator with OTA input and current feedback, followed by a second-order comb-filter decimator. Powered from a 1.5V supply, the analog and digital circuits in each channel draw 2.1uA and 1.4uA of supply current, respectively. The bioADCs achieve an SNR of 57dB and a SFDR or 63.5dB, for 9-b ENOB. Intracranial EEG recordings from an anesthetized rat are shown and compared to simultaneous recordings from a commercial reference system to validate performance in-vivo. The micropower operation and direct digital readout make this circuit ideally suited for closed-loop neuromodulation applications.

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A 5 μw/channel 9b-ENOB BioADC array for electrocortical recording

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