Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

2011-07-19

2011-07-19

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C375S350000

Reexamination Certificate

active

07982652

ABSTRACT:
A method of analog-to-digital conversion over n bits of an analog signal, including the steps of: comparing the amplitude of the analog signal with a threshold representing the amplitude of the full-scale analog signal divided by 2k, where k is an integer smaller than n; performing an analog-to-digital conversion of the analog signal over n−k bits to obtain the n−k most significant bits of a binary word over n bits if the result of the comparison step indicates that the amplitude of the input signal is greater than the threshold, and the n−k least significant bits of this binary word otherwise. An analog-to-digital converter and its application to image sensors.

REFERENCES:
patent: 6608582 (2003-08-01), Casper et al.
patent: 6904110 (2005-06-01), Trans et al.
patent: 59143420 (1984-08-01), None
M.F. Snoeij et al., A Low-Power Column-Parallel 12-bit ADC for CMOS Imagers, Delft University of Technology, Jun. 2005, pp. 169-172, The Netherlands.

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