Peer-Reviewed Journal Details
Mandatory Fields
Soraghan, CJ;Markham, C;Matthews, F;Ward, TE
2009
April
Electronics Letters
Triple wavelength LED driver for optical brain-computer interfaces
Published
5 ()
Optional Fields
45
392
393
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 back-scattered from the brain. With total harmonic distortion of 0.95% and a frequency range of similar to 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.
HERTFORD
0013-5194
10.1049/el.2009.0214
Grant Details