Patent ID: 7604360
Filing Date: 2009-10-20
Classification: G01J,H04N

Abstract:
1. A CMOS integrated circuit sensor for measuring light from a light source, said sensor comprising: first and second photodiodes that are illuminated by said light, said first and second photodiodes generating first and second photodiode output signals indicative of first and second weighted averages of the intensity of light in a wavelength band between 400 nm and 700 nm, said first photodiode being more sensitive to light having wavelengths between 400 nm and 500 nm than said second-photodiode, said first and second photodiodes being characterized by first and second distances, respectively, from a surface of said sensor to first and second p-n junctions associated. respectively, with said first and second photodiodes, said first distance being different from said second distance, neither of said photodiodes having an individual CMOS bandpass filter disposed thereover, and a color temperature processing circuit that generates a first processed signal that is related to a ratio of said first and second signals.