Patent ID: 7126636

Claim:
A CMOS active pixel for an image sensor comprising: a photosensitive element whose electrical charge is reset during a reset phase and read during a read phase, the photosensitive element connected between a photosensitive node and a ground; a first amplifier, active during the reset phase, the first amplifier including an output, an inverter input connected to the photosensitive node, and a non-inverter input connected to a reference voltage source; a first switch, connected between the inverter input and the output of the first amplifier, the first switch controlled by a first control signal that is active during a first period of the reset phase and inactive during a second period and a third period of the reset phase and during a read phase; a capacitive element connected between the output of the first amplifier and an intermediate node of the pixel; a second switch connected between the photosensitive node and the intermediate node of the pixel, controlled by a second control signal that is active during the start of the first period of the reset phase and during the totality of the second period of the reset phase and inactive during the third period of the reset phase and during the read phase, and a second amplifier mounted as a follower, active during the read phase, the second amplifier including an input connected to the photosensitive node and an output delivering a signal representing the electric charge of the photosensitive element during the read phase.