Method and apparatus for saturation detection and electronic...

Details Method and apparatus for saturation detection and electronic... Method and apparatus for saturation detection and electronic...

2009-09-21

2010-06-15

Misleh, Justin P (Department: 2622)

Television

Camera, system and detail

Solid-state image sensor

C348S364000

Reexamination Certificate

active

07738020

ABSTRACT:
An imaging system includes a photocell circuit. The photocell circuit includes a photodetector circuit. The photodetector circuit includes an input configured to receive incident light. A first terminal communicates with a sample node. A second terminal communicates with a monitor node. A sampling circuit is configured to drive the sample node to a first reset value at a first time in response to a first reset signal. The sampling circuit allows the first reset value to decay at a second time subsequent to the first time. A monitor circuit is configured to drive the monitor node to a second reset value at the first time in response to a second reset signal. The monitor circuit allows the second reset value to decay at the second time. The monitor circuit detects a third time when the monitor node decays to a predetermined stop value subsequent to the second time.

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