Patent ID: 7122775

Claim:
A semiconductor integrated circuit device comprising: a correlation double sampling circuit for sampling an analog color video signal output from an imaging element; an amplifying circuit for amplifying the analog color video signal output from the correlation double sampling circuit; an AD conversion circuit for converting the analog color video signal amplified by the amplifying circuit to a digital signal comprising first codes; a differential circuit for obtaining a difference between the first codes in regard to same colors; and a code conversion circuit for code conversion of second codes corresponding to an output of the differential circuit, wherein the correlation double sampling circuitm the amplifying circuit, the AD conversion circuit, the differential circuit, and the code conversion circuit are formed on a semiconductor substrate, wherein a gain of the amplifying circuit can be varied, wherein third codes corresponding to an output of the code conversion circuit are obtained from the code conversion circuit, wherein change bits between a third code corresponding to a second code and a third code corresponding to a next to the second code are less in number than change bits between the second code and the next to the second code by the code conversion when the second code is positive and the next to the second code is negative, wherein change bits between a third code corresponding to a second code and a third code corresponding to a next to the second code are less in number than change bits between the second code and the next to the second code by the code conversion when the second code is negative and the next to the second code is positive.