title: Vertical triple-junction RGB optical sensor with signal processing based on the determination of the space-charge region borders.
abstract: A triple-junction RGB optical sensor with vertically stacked photodiodes and signal processing that provides precise values of the currents generated by blue, green, and red light is presented. The signal processing is based on the determination of the border depths of the space-charge regions of all three photodiodes. A current-mode implementation using current conveyors and variable-gain current amplifiers is introduced. The responsivities of all three photodiodes calculated using the proposed approach are in very good agreement with the measured results.
authors.forename: Nikša
authors.initials: N
authors.lastname: Tadić
authors.forename: Stefan
authors.initials: S
authors.lastname: Schidl
authors.forename: Horst
authors.initials: H
authors.lastname: Zimmermann
mesh_terms: D003116:Color; D055096:Optical Devices; D055620:Optical Phenomena; D012815:Signal Processing, Computer-Assisted