Device and method of fitted variable gain analog-digital...

Details Device and method of fitted variable gain analog-digital... Device and method of fitted variable gain analog-digital...

2006-02-14

2006-02-14

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S079000, C341S200000

Reexamination Certificate

active

06999018

ABSTRACT:
The variable gain analog-to-digital conversion device (1) for an image sensor comprises at least one N-bit non-linear coarse first converter (21) receiving a pixel voltage signal (Vpix) and at least one M-bit linear fine second converter (22) connected to the first converter (21) in order for the device to supply a binary word of N+M bits relating to the voltage level of the pixel. The first converter (21) comprises comparison means (33) for comparing the voltage level of the pixel with one or more voltage thresholds (V0to V4) delimiting voltage ranges within the voltage dynamic range of the sensor. The successive voltage ranges represent areas of illumination of the pixel ranging from a weakly lit area to a strongly lit area. The first comparator supplies an N-bit binary word relating to the area of illumination determined for the pixel. The second converter comprises conversion adaptation means for converting the voltage pixel signal to a number of bits less than or equal to M, depending on the N-bit binary word from the first converter.

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Single-Chip CMOS Image Sensor for Mobile Applications, Kwangho Yoon et al, IEEE Journal of Solid-State Circuits, vol. 37, No. 12, Dec. 2002, pp. 1839-1845.

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