Analog-to-digital conversion in pixel array

Details Analog-to-digital conversion in pixel array Analog-to-digital conversion in pixel array

2010-01-29

2011-10-18

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

08040269

ABSTRACT:
An analog-to-digital converter generates an output digital value equivalent to the difference between two analog signals. The converter forms part of a set of converters. The converter receives a first analog signal and a second analog signal (Vreset, Vsig) and a ramp signal (Vramp). A clock is dedicated to the converter, or a sub-set of converters. A control stage enables a first counter based on a comparison of the ramp signal with the first analog signal and the second analog signal. The converter can be calibrated by at least one reference signal (Vref1, Vref2) which is common to the set of converters. A-to-D conversion can include a first A-to-D conversion stage which determines a signal range, selected from a plurality of signal ranges, and a second A-to-D conversion stage which determines an M-bit digital value equivalent to the difference between the first and second analog signals by comparing the signals with a ramp signal, with the ramp signal having the signal range determined by the first analog-to-digital conversion stage.

REFERENCES:
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patent: 7556206 (2009-07-01), Chivers
patent: 7924335 (2011-04-01), Itakura et al.
patent: 2007/0216564 (2007-09-01), Koseki
patent: 2010/0245639 (2010-09-01), Mori
patent: 2 379 812 (2003-03-01), None
British Search Report issued in GB0902822.6 of May 27, 2009, 2 pages.

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