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서성호 ( Sung Ho Suh ),김정환 ( Jung Hwan Kim ),공재성 ( Jae Sung Kong ),신장규 ( Jang Kyoo Shin ) 한국센서학회 2005 센서학회지 Vol.14 No.3
N/A When fabricating a vision chip, we should consider the noise problem, such as the fixed pattern noise(FPN) due to the process variation. In this paper, we propose an edge-detection circuit based on biological retina using the offset-free column readout circuit to reduce the FPN occurring in the photo-detector. The offset-free column readout circuit consists of one source follower, one capacitor and five transmission gates. As a result, it is simpler and smaller than a general correlated double sampling(CDS) circuit. A vision chip for edge detection has been designed and fabricated using 0.35 pm 2-poly 4-metal CMOS technology, and its output characteristics have been investigated.