Pre-subtracting architecture for enabling multiple spectrum image sensing

Abstract

A method is provided having the first step of generating a first signal representing a first amount of light detected by a first pixel sensor, where the first amount of light is composed of light in a first spectrum and in a second spectrum. The method continues with generating a second signal representing a second amount of light detected by a second pixel sensor, where the second amount of light is composed of light in the second spectrum. Then, subtracting the second signal from the first signal. An architecture is also provided having a photodiode with a first output signal. A mirror circuit is coupled to the photodiode to duplicate the first output signal into a set of duplicated photodiode output signals. A filter array is coupled to the photodiode having a first infrared pass spectrum.

Dependencies are inferred from the claim text.