INTEGRATED CIRCUIT DEVICE AND ELECTRONIC APPARATUS

PROBLEM TO BE SOLVED: To provide an integrated circuit device that performs a precise analog-to-digital (A/D) conversion of a signal corresponding to a difference between a first signal and a second signal when a channel signal of a sensor device is composed of the first signal and the second signal...

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Bibliographic Details
Main Authors YONEZAWA TAKEMI, ITO SATORU, OGUCHI YASUHIRO
Format Patent
LanguageEnglish
Published 01.03.2012
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRICITY
PULSE TECHNIQUE
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Summary:PROBLEM TO BE SOLVED: To provide an integrated circuit device that performs a precise analog-to-digital (A/D) conversion of a signal corresponding to a difference between a first signal and a second signal when a channel signal of a sensor device is composed of the first signal and the second signal.SOLUTION: An integrated circuit device includes: an amplifier circuit where a first signal SG1 from a sensor device is input during a first duration, a second signal SG2 which forms a pair with the first signal SG1 to make up a channel signal of the sensor device is input during a second duration, and a signal corresponding to a difference between the first signal SG1 and the second signal SG2 is output; and an A/D converter that performs A/D conversion for an output signal of the amplifier circuit. The amplifier circuit comprises a switched capacitor circuit that cancels offset voltage of an operational amplifier of the amplifier circuit.
Bibliography:Application Number: JP20100182117