| 摘要 |
<p>In an image sensor, a photo detector circuit (305) applies a photo current to a capacitive node (312) during a photo detection time interval. A front-end circuit (306) comprises an input transistor (314) having a control node that is coupled to the capacitive node (312). A switchable biasing arrangement (301) puts the input transistor in a disabled state during the photo detection time interval. The input transistor is put in an enabled state after the photo detection time interval. This then causes the front-end circuit (306) to provide an output signal (309) that is representative of a voltage (308) on the capacitive node after the photo detection time interval.</p> |
