Patent ID: 7696464

Claim:
An imaging device comprising: at least one pixel cell comprising: a photosensitive region for accumulating charges; a charge storage region; a transfer transistor for transferring accumulated charges from the photosensitive region to the charge storage region; and a reset transistor for resetting the charge storage region; a column sample and hold circuit connected to the at least one pixel cell by a column line; column line biasing circuitry for selectively biasing the column line with a current of one of a first lower level and a second higher level; and a control circuit for controlling the biasing circuitry such that a resistance on the column line is reduced before a readout of charges from the charge storage region, wherein a pulse used to set the bias current at the second level during a reset operation is applied during and continues after the reset pulse, and wherein a pulse used to set the bias current at the second level during a charge transfer operation is applied during and continues after the transfer pulse.