Soraghan , C.J. and Markham, C. and Matthews, F. and Ward, T.E.
Triple wavelength LED driver for optical brain–computer interfaces.
Electronics Letters, 45 (8).
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.
||Triple wavelength; LED driver; optical brain–computer interfaces;
||Science & Engineering > Electronic Engineering
Dr Tomas Ward
||02 Oct 2009 10:35
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