Stephen C. DeMarco

Works (4)

Updated: July 5th, 2023 16:01

2003 article

An arbitrary waveform stimulus circuit for visual prostheses using a low-area multibias dac

DeMarco, S. C., Liu, N. W., Singh, P. R., Lazzi, G., Humayun, M. S., & Weiland, J. D. (2003, September 30). IEEE Journal of Solid-State Circuits.

By: S. DeMarco n, N. Liu n, P. Singh  n, G. Lazzi n, M. Humayun * & J. Weiland *

author keywords: age-related macular degeneration; digital-to-analog converter (DAC); electrical stimulation; retinal prosthesis; retinitis pigmentosa; visual prosthesis
topics (OpenAlex): Neuroscience and Neural Engineering; Advanced Memory and Neural Computing; CCD and CMOS Imaging Sensors
TL;DR: Improvements to conventional circuit designs with significantly decreased implementation area and the ability to support arbitrary stimulus waveforms where an array of such stimulus circuits is required are described. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2003 article

Computed SAR and thermal elevation in a 0.25-mm 2-D model of the human eye and head in response to an implanted retinal stimulator. I. Models and methods

DeMarco, S. C., Lazzi, G., Liu, N. W., Weiland, J. D., & Humayun, M. S. (2003, September 1). IEEE Transactions on Antennas and Propagation.

By: S. DeMarco n, G. Lazzi n, N. Liu n, J. Weiland * & M. Humayun *

author keywords: age-related macular degeneration; finite-difference time domain (FDTD); retina prosthesis; retinitis pigmentosa; specific absorption rate (SAR); stimulator IC; temperature; thermal simulation
topics (OpenAlex): Neuroscience and Neural Engineering; Photoreceptor and optogenetics research; Molecular Communication and Nanonetworks
TL;DR: Methods and models used to estimate the heating induced in the human eye and surrounding head tissues subject to the operation of this retinal prosthesis and comparison with in vivo experimental measurements on intraocular heating in dog eyes shows good agreement. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2003 article

Computed SAR and thermal elevation in a 0.25-mm 2-D model of the human eye and head in response to an implanted retinal stimulator. II. Results

Lazzi, G., DeMarco, S. C., Liu, N. W., Weiland, J. D., & Humayun, M. S. (2003, September 1). IEEE Transactions on Antennas and Propagation.

By: G. Lazzi n, S. DeMarco n, N. Liu n, J. Weiland * & M. Humayun *

author keywords: age-related macular degeneration; finite-difference time domain (FDTD); retina prosthesis; retinitis pigmentosa; specific absorption rate (SAR); stimulator IC; temperature; thermal simulation
topics (OpenAlex): Neuroscience and Neural Engineering; Photoreceptor and optogenetics research; EEG and Brain-Computer Interfaces
TL;DR: Methods and models used to estimate the heating induced in the human eye and surrounding head tissues subject to the operation of this retinal prosthesis and comparison with in vivo experimental measurements on intraocular heating in dog eyes shows good agreement. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2000 article

A neuro-stimulus chip with telemetry unit for retinal prosthetic device

Liu, W., Vichienchom, K., Clements, M., DeMarco, S. C., Hughes, C., McGucken, E., … Greenberg, R. (2000, October 1). IEEE Journal of Solid-State Circuits.

By: W. Liu n, K. Vichienchom n, M. Clements n, S. DeMarco n, C. Hughes n, E. McGucken n, M. Humayun *, E. Juan*, J. Weiland *, R. Greenberg*

author keywords: biomedical telemetry; neuro-stimulator; retinal prosthesis
topics (OpenAlex): Neuroscience and Neural Engineering; Advanced Memory and Neural Computing; EEG and Brain-Computer Interfaces
TL;DR: A microchip which serves as the telemetry protocol decoder and stimulus signal generator is fabricated by MOSIS with 1.2-mm CMOS technology and was demonstrated to provide the desired biphasic current stimulus pulses for an array of 100 retinal electrodes at video frame rates. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

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