Analog to digital converter

Details Analog to digital converter Analog to digital converter

2007-01-11

2008-09-30

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

Reexamination Certificate

active

07429945

ABSTRACT:
The invention relates to an analog-to-digital converter comprising a reference voltage generating circuit, two coarse/fine comparators and two encoders for encoding the comparison result of the two coarse/fine comparators. In the invention, the two coarse/fine comparators processes a coarse comparison procedure and a fine comparison procedure on an input voltage in different clock cycle, thus, a sampling voltage error caused by an error of sampling time decreases. In another aspect of the invention, the capacitance of the input capacitor of the analog-to-digital converter decreases because the comparators for coarse comparison and fine comparison are the same, thus, a large power amplifier is not required for driving the input capacitor.

REFERENCES:
patent: 4639715 (1987-01-01), Doluca
patent: 4903028 (1990-02-01), Fukushima
patent: 5463395 (1995-10-01), Sawai
patent: 2004/0189504 (2004-09-01), Dasgupta
Shih et al., A Fully Differential Comparator Using a Switched-Capacitor Differencing Circuit with Common-Mode Rejection, IEEE Journal of Solid-State Circuits, vol. 32, No. 2, Feb. 1997 pp. 250-253.

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