2-stage A/D converter and image sensor using the same

Details 2-stage A/D converter and image sensor using the same 2-stage A/D converter and image sensor using the same

2007-06-05

2007-06-05

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

10551230

ABSTRACT:
In a conventional CMOS image sensor, an A/D converter for performing A/D conversion at high-speed arranges the A/D converter elements in columns so as to operate in parallel, and has low resolution in the order of 9 or so bits. The present invention provides an A/D converter for an image sensor, which performs a part of the A/D conversion functions by using a noise cancellation circuit in columns and performs amplification simultaneously with this, thereby obtaining a high signal noise ratio (SNR) and implementing an A/D converter with a high resolution along with the A/D conversion section in a subsequent stage.

REFERENCES:
patent: 7002628 (2006-02-01), Panicacci
patent: 7046284 (2006-05-01), Kozlowski et al.
patent: 7068319 (2006-06-01), Barna et al.
patent: 5-152959 (1993-06-01), None
patent: 2002-124877 (2002-04-01), None
patent: 2002124877 (2002-04-01), None
patent: 2002-232291 (2002-08-01), None
patent: 2002-261613 (2002-09-01), None

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