A/D converter

Details A/D converter A/D converter

2009-04-21

2010-11-09

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S118000, C341S155000, C341S156000

Reexamination Certificate

active

07830295

ABSTRACT:
In an A/D converter, three capacitors are connected to a comparator. The A/D converter also includes three switching circuits that each input a first reference voltage, a second reference voltage, and a third reference voltage in the three capacitors. A control circuit selects at least two of the three switching circuits during a charging period of stray capacitance of each of the capacitors. The control circuit turns on one of the switching devices in the selected switching circuits simultaneously, and during a comparing period by the comparator, selects one of the three capacitors for each comparison, and selects another capacitor in the next comparison.

REFERENCES:
patent: 4012247 (1977-03-01), Eigenmann
patent: 4907002 (1990-03-01), Kawada
patent: 4983974 (1991-01-01), Mijuskovic
patent: 5258761 (1993-11-01), Fotouhi et al.
patent: 6304208 (2001-10-01), Nagashima
patent: 6686865 (2004-02-01), Confalonieri et al.
patent: 6714151 (2004-03-01), Tachibana et al.
patent: 2003/0234736 (2003-12-01), Tachibana et al.
patent: 2008/0158028 (2008-07-01), Yang et al.
patent: 04-152717 (1992-05-01), None
patent: 2008-005001 (2008-01-01), None

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