Image sensor with direct digital correlated sampling

Details Image sensor with direct digital correlated sampling Image sensor with direct digital correlated sampling

1997-06-12

2000-09-05

Ho, Tuan

Television

Camera, system and detail

Solid-state image sensor

348241, H04N 5335

Patent

active

061150665

ABSTRACT:
A CMOS image sensor is provided in which correlated double sampling is performed entirely in the digital domain. In an exemplary embodiment, the image sensor includes a plurality of imager cells arranged in rows and columns, where the imager cells of a particular column are coupled to a column data line of that column. Each active imager cell is capable of selectively providing a first output on an associated column data line indicative of a reset level during a first sampling interval. During a second sampling interval, each active imager cell provides a signal output on the associated column data line indicative of an amount of light incident upon that imager cell. At least one analog to digital (A/D) converter is coupled to the column data lines and converts the first and signal outputs on each column data line to first and second digital codes, respectively, to complete a correlated double sampling operation. The invention eliminates the need for analog capacitors to store the reset and signal levels.

REFERENCES:
patent: 5434619 (1995-07-01), Yonemoto
patent: 5793423 (1999-07-01), Hamassaki
patent: 5926214 (1999-07-01), Denyer et al.

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