Patent ID: 7189955

Claim:
A device for correcting at least one of a reset noise and a fixed pattern noise of an active pixel having a photosensitive element connected to a read node, a voltage of the read node being representative of a charge of the photosensitive element, the charge of the photosensitive element being reset in a reset step, the device comprising: a transmission circuit connecting the photosensitive element to a correction node and capable of operating in a first operating state in which a transmission gain between the correction node and the read node is equal to a first transmission gain and in a second operating state in which the transmission gain between the correction node and the read node is equal to a second transmission gain; a circuit for measuring the voltage at the read node after reset of the charge of the photosensitive element, said voltage comprising at least one of a reset noise component and a fixed pattern noise component; a circuit for providing a first correction voltage equal to a sum of a constant voltage and of a second correction voltage, comprising the at least one of the reset noise component and the fixed pattern noise component multiplied by an amplification gain having an absolute value equal to an absolute value of an inverse of a difference between the first transmission gain and the second transmission gain; and a correction circuit capable of bringing the correction node from the constant voltage to the first correction voltage, the transmission circuit being in the first operating state, and of bringing the correction node to the constant voltage, the transmission circuit being in the second operating state to subtract the at least one of the reset noise component and the fixed pattern noise component from the voltage at the read node.