| 摘要 |
<p>A pixel comprising:
a photo-sensitive element for generating charges in response to incident radiation;
a sense node;
a transfer gate, connected between the photo-sensitive element and the sense node, for controlling transfer of charges to the sense node;
a reset switch connected to the sense node for resetting the sense node to a predetermined voltage;
a first buffer amplifier having an input connected to the sense node;
a first sample stage, connected to an output of the first buffer amplifier, which is selectively operable to sample a value of the sense node;
a second sample stage connected in cascade with the first sample stage which is selectively operable to sample a value of the sense node; and
a second buffer amplifier having an input connected to the second sample stage;
wherein the transfer gate is adapted for transferring substantially all charge from the photosensitive element to the sense node when the transfer gate is opened.</p> |
