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1. (WO2017019173) LIGHT SENSOR WITH CORRELATED DOUBLE SAMPLING

Pub. No.:    WO/2017/019173    International Application No.:    PCT/US2016/034843
Publication Date: Fri Feb 03 00:59:59 CET 2017 International Filing Date: Sat May 28 01:59:59 CEST 2016
IPC: H04N 5/357
H04N 5/378
H04N 5/374
H04N 5/372
Applicants: INTEL CORPORATION
Inventors: HICKS, Richmond
Title: LIGHT SENSOR WITH CORRELATED DOUBLE SAMPLING
Abstract:
A light sensor is described with correlated double sampling. In one example a first storage element is coupled to a photodetector to collect free electrons as an accumulated charge. A transfer switch is coupled to the first storage element. A second storage element is coupled to the first storage element through the transfer switch to collect the accumulated charge from the first storage element when the transfer switch is open. A sense circuit measures the charge on the second storage element before the accumulated charge is collected from the first storage element as a reference charge and measures the charge on the second storage element after the accumulated charge is collected from the first storage element as a read charge. The sensed charge is determined by comparing the reference charge to the read charge.