A/D conversion device having input level shift and output...

Details A/D conversion device having input level shift and output... A/D conversion device having input level shift and output...

2006-04-18

2006-04-18

JeanPierre, Peguy (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S120000, C341S139000, C341S141000, C341S155000, C341S158000

Reexamination Certificate

active

07030791

ABSTRACT:
In an A/D conversion device, one level shift circuit shifts an input voltage to the low potential side by Vt1, and another level shift circuit shifts the input voltage to the high potential side by Vt2. A multiplexer selects either of the shifted voltages to an A/D converter. In a correction mode, a correction data holding circuit holds values of reference voltages that are also A/D converted after being passed through the one level shift circuit and values of reference voltages that are A/D converted by being passed through the other level shift circuit, as correction values. A correction control circuit corrects the A/D converted value using the correction values.

REFERENCES:
patent: 4654632 (1987-03-01), Yoshida et al.
patent: 5212483 (1993-05-01), Wakimoto
patent: A-2001-111424 (2001-04-01), None
patent: A-2001-223586 (2001-08-01), None
patent: A-2003-31415 (2003-01-01), None

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