Offset noise cancellation in array image sensors
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United States of America Patent
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May 23, 2000
Grant Date -
N/A
app pub date -
Nov 14, 1996
filing date -
Sep 12, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An integrated circuit active pixel image sensor comprises an array of active pixels having associated therewith one capacitor in each pixel column for storing a combined pixel output signal comprising an image signal and a fixed offset signal and another capacitor in each column for capturing another signal produced when the pixel is reset. The array may be read row-by-row. Each column includes a comparator and a data latch via which a digitized fixed offset corrected pixel output signal is obtained using a ramp voltage source and a digital count broadcaster provided in the sensor.
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