Analog-to-digital converter

Details Analog-to-digital converter Analog-to-digital converter

2008-07-29

2008-07-29

Williams, Howard (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S161000

Reexamination Certificate

active

07405690

ABSTRACT:
An A-D converter includes a first amplifier circuit, an A-D converter circuit, a D-A converter circuit, a subtraction circuit, a second amplifier circuit, a timing control circuit, a type control unit, an output unit. The type control unit sets the type of the A-D converter circuit at the time of conversion to the higher 4 bits, to a type in which either one of an analog signal or a reference voltage is inputted selectively to a comparator via a capacitor. The type control unit performs a control so that the type of the A-D converter circuit at the time of conversion to values of the higher 5th to 7th bits and the higher 8th to 10th bits from the most significant bit, to a type in which an analog signal and a reference voltage are inputted fixedly to a comparator without involving a capacitor.

REFERENCES:
patent: 7199745 (2007-04-01), Tachibana et al.
patent: 2007/0035434 (2007-02-01), Tachibana et al.
patent: 2007/0176817 (2007-08-01), Kobayashi
patent: 9-275342 (1997-10-01), None

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