Title :
CMOS field-modulated color sensor
Author :
Ho, Derek ; Gulak, Glenn ; Genov, Roman
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Toronto, Toronto, ON, Canada
Abstract :
A digital photosensor for multi-color imaging is presented. By modulating the electric field applied to the photo sensing region, the sensor reports light intensity at discrete wavelengths. It utilizes standard CMOS technology, integrating a spectrally-sensitive photodiode and a current-to-frequency analog-to-digital converter on the same die. A 0.35μm prototype demonstrates intensity measurement of 540nm (green) and 640nm (red) illumination with an optical sensitivity of 1μW/cm2/level and consumes 0.3mW from a 3.3V supply.
Keywords :
CMOS image sensors; analogue-digital conversion; image colour analysis; image intensifiers; photodetectors; photodiodes; CMOS field-modulated color sensor; current-to-frequency analog-to-digital converter; digital photosensor; discrete wavelength; electric field modulation; intensity measurement; light intensity; multicolor imaging; optical sensitivity; power 0.3 mW; size 0.35 mum; size 540 nm; size 640 nm; spectrally-sensitive photodiode; voltage 3.3 V; CMOS integrated circuits; Current measurement; Image color analysis; Logic gates; Mathematical model; Voltage measurement; Wavelength measurement;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2011 IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4577-0222-8
DOI :
10.1109/CICC.2011.6055394
