Patent ID: 6974944

Claim:
An image sensor including a plurality of pixels, comprising: a plurality of pixel circuits, each of which comprises a photoelectric conversion element, a first transistor to which a detection signal generated by the photoelectric conversion element is supplied, and a second transistor connected to said first transistor and controlled by a select line; and a common amplifier circuit, which is provided commonly to the plurality of pixel circuits, and which has a third transistor connected in parallel to said first transistor, and a current circuit for supplying current to said first and third transistors, wherein an amplifying circuit, which amplifies said detection signal, is formed by the first transistor in a pixel circuit selected by said select line, and by the third transistor in said common amplifier circuit, and wherein a negative feedback circuit is provided between the drain and gate of said third transistor, wherein one of a resistance of the negative feedback circuit, and a resistance between the negative feedback circuit and a reference potential, is constituted so as to be variable.