Comparative characterization of in vivo and in vitro noise of the SIROF Utah electrode array

Gardner, A. Tye; Mize, John; Warren, David J.; Walker, Ross M.

doi:10.1109/icsens.2017.8233915

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Recently, we performed wideband spectral measurements of implanted electrodes [ 37 , 38 , 39 , 40 ] ( Figure 3 ). These measurements characterize the noise at high frequency as thermal in origin, on the basis of impedance magnitude and phase measurements.…”

Section: Rapidly Multiplexed Neural Recording: Theory and Practicamentioning

confidence: 99%

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Acquisition of Neural Action Potentials Using Rapid Multiplexing Directly at the Electrodes

et al. 2018

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Neural recording systems that interface with implanted microelectrodes are used extensively in experimental neuroscience and neural engineering research. Interface electronics that are needed to amplify, filter, and digitize signals from multichannel electrode arrays are a critical bottleneck to scaling such systems. This paper presents the design and testing of an electronic architecture for intracortical neural recording that drastically reduces the size per channel by rapidly multiplexing many electrodes to a single circuit. The architecture utilizes mixed-signal feedback to cancel electrode offsets, windowed integration sampling to reduce aliased high-frequency noise, and a successive approximation analog-to-digital converter with small capacitance and asynchronous control. Results are presented from a 180 nm CMOS integrated circuit prototype verified using in vivo experiments with a tungsten microwire array implanted in rodent cortex. The integrated circuit prototype achieves <0.004 mm2 area per channel, 7 µW power dissipation per channel, 5.6 µVrms input referred noise, 50 dB common mode rejection ratio, and generates 9-bit samples at 30 kHz per channel by multiplexing at 600 kHz. General considerations are discussed for rapid time domain multiplexing of high-impedance microelectrodes. Overall, this work describes a promising path forward for scaling neural recording systems to numbers of electrodes that are orders of magnitude larger.

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Section: Rapidly Multiplexed Neural Recording: Theory and Practicamentioning

confidence: 99%

“…For the in vitro measurements, the measured noise and predicted thermal noise match well across the spectrum. For in vivo measurements, there is excess low-frequency noise/activity attributed to biological sources other than local AP activity [ 37 , 38 , 39 , 44 ].…”

Section: Rapidly Multiplexed Neural Recording: Theory and Practicamentioning

confidence: 99%

Acquisition of Neural Action Potentials Using Rapid Multiplexing Directly at the Electrodes

et al. 2018

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A Multiplexed Electrochemical Measurement System for Characterization of Implanted Electrodes

Gardner

Strathman

Walker

2020

2020 IEEE International Symposium on Circuits and Systems (ISCAS)

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A Sub-$\mu$ W Reconfigurable Front-End for Invasive Neural Recording That Exploits the Spectral Characteristics of the Wideband Neural Signal

Valtierra

Delgado‐Restituto

Fiorelli

et al. 2020

IEEE Trans. Circuits Syst. I

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Comparative characterization of in vivo and in vitro noise of the SIROF Utah electrode array

Cited by 3 publications

References 8 publications

Acquisition of Neural Action Potentials Using Rapid Multiplexing Directly at the Electrodes

Acquisition of Neural Action Potentials Using Rapid Multiplexing Directly at the Electrodes

A Multiplexed Electrochemical Measurement System for Characterization of Implanted Electrodes

A Sub-$\mu$ W Reconfigurable Front-End for Invasive Neural Recording That Exploits the Spectral Characteristics of the Wideband Neural Signal

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