| 摘要 |
PROBLEM TO BE SOLVED: To provide a CMOS solid imaging device which does not generate noise in the pixel column even if there is fluctuation in the output of a CDS (correlation double sampling) circuit. SOLUTION: The imaging device comprises CDS circuits 5-7 connected in parallel for each of pixel columns n1-n3, switching means 8-10 for selectively switching the CDS circuits 5-7, a transferring circuit 11, a level determining circuit 12, and a selecting circuit 13. The transferring circuit 11 transfers an imaging signal outputted from the CDS circuits 5-7 selected by the switching means 8-10. The level determining circuit 12 compares an average level value of the CDS circuit output values obtained by passing the imaging signal for respective CDS circuits 5-7 connected in parallel for each of pixel columns n1-n3 with an imaging signal level outputted from the transferring circuit 11, and determines one out of the CDS circuits 5-7 for each of pixel columns n1-n3 so as to get the smallest level difference. The selecting circuit 13 outputs a selection signal, which selects the CDS circuits 5-7 determined by the level determining circuit 12 for each of pixel columns n1-n3, to the switching means 8-10. COPYRIGHT: (C)2004,JPO
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