Journal Article


T.E. Ward
F. Matthews
C. Markham
C.J. Soraghan



wavelength source separation brain computer interfaces continuous wave harmonic distortion led optical electronic engineering

Triple wavelength LED driver for optical brain–computer interfaces (2009)

Abstract A dedicated triple wavelength LED driver is presented for optical brain–computer interfacing (BCI). The solution caters for the constraints of a common-anode grounded case and modulation up to several kilohertz that allows source separation of light that has backscattered from the brain. With total harmonic distortion of 0.95% and a frequency range of ~40 kHz, the driver has application in a continuous wave optical BCI. Other modulation strategies such as time division multiplexing (TDM) are catered for, owing to input DC coupling. Linearity in the optical output is maintained by the ‘load sensing’ differential op-amp on the LED’s current limiting resistor, which is the basis for the V-I conversion.
Collections Ireland -> Maynooth University -> Subject = Science & Engineering: Electronic Engineering
Ireland -> Maynooth University -> Type = Article
Ireland -> Maynooth University -> Academic Unit = Faculty of Science and Engineering: Electronic Engineering
Ireland -> Maynooth University -> Status = Published

Full list of authors on original publication

T.E. Ward, F. Matthews, C. Markham, C.J. Soraghan

Experts in our system

Tomas Ward
Maynooth University
Total Publications: 189
Charles Markham
Maynooth University
Total Publications: 64