METHOD AND CIRCUIT FOR PERFORMING PIXEL CORRELATED DOUBLE SUB-SAMPLING BY ACTIVE PIXEL SENSOR ARRAY

摘要

PPROBLEM TO BE SOLVED: To provide a method and circuit for performing pixel CDSS by an APS array. PSOLUTION: A pixel outputs an image signal voltage after outputting a reset voltage. A sub-sampling method and apparatus includes the steps of: sub-sampling a plurality of pixels (LSP2/SP), storing LSP2/SPanalog reset charges outputted from the LSP2/SPpixels into a first set of NSP2/SPcapacitor and compositing the LSP2/SPanalog reset charges; storing LSP2/SPanalog image signal charges outputted from the LSP2/SPpixels in the first set of NSP2/SPcapacitor and compositing the LSP2/SPanalog image signal charges; and subtracting voltage VR indicated by the composited LSP2/SPreset charge from voltage VS indicated by a composited image signal charge and generating a differential voltage VS-VR. PCOPYRIGHT: (C)2005,JPO&NCIPI