A-D convert apparatus and control method

Details A-D convert apparatus and control method A-D convert apparatus and control method

2010-01-14

2011-11-29

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

08068047

ABSTRACT:
Provided is an AD conversion apparatus including: a differential amplifier that generates a differential input voltage according to an analog input signal; a differential DA converter of a charge redistribution type, which outputs a differential output voltage resulting from subtracting the differential input voltage from a differential comparison voltage that is in accordance with comparison data; a comparator that compares a positive output voltage and a negative output voltage in the differential output voltage; a control section that identifies the comparison data at which the differential output voltage becomes substantially 0 based on a comparison result of the comparator, and outputs the identified comparison data as output data; and a setting section that sets at least one of a common potential of the differential amplifier and a common potential of the differential DA converter, according to a targeted value of a common potential of the comparator

REFERENCES:
patent: 5581252 (1996-12-01), Thomas
patent: 5675340 (1997-10-01), Hester et al.
patent: 6400302 (2002-06-01), Amazeen et al.
patent: 6897801 (2005-05-01), Confalonieri et al.

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