Patent ID: 8289426

Claim:
An image pickup device comprising: a pixel region in which a plurality of pixels are arranged in columns of a matrix; amplifiers respectively arranged for the columns of the matrix of the pixel region, each amplifier being configured to amplify an analog signal from a pixel of a corresponding column; and A/D converters respectively arranged for the columns of the matrix of the pixel region, each A/D converter being configured to convert, into a digital value, an analog signal amplified by one of the amplifiers, wherein each of the A/D converters includes an integrator, to which a fixed signal and the analog signal amplified by a corresponding one of the amplifiers are selectively input, the integrator being configured to output an electric signal based on the analog signal from the corresponding pixel as an initial value, and thereafter to perform an operation of integrating a constant current based on the fixed signal, thereby converting the analog signal from the corresponding pixel into a digital value, and wherein the constant current is generated by commonly supplying the fixed signal through a resistor to each of the integrators of the A/D converters.