Semiconductor integrated circuit

Details Semiconductor integrated circuit Semiconductor integrated circuit

2007-10-02

2007-10-02

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S155000

Reexamination Certificate

active

11369751

ABSTRACT:
A semiconductor integrated circuit including an A/D converter capable of converting an analog signal accepted through an external terminal into a digital signal. The A/D converter includes: a ladder-type resistor for generating a reference voltage; a set of first operational amplifiers, each accepts an output voltage of the ladder-type resistor; a set of first switches, each capable of short-circuiting an input terminal and an output terminal of corresponding one of the first operational amplifiers thereby to allow an offset correction of the corresponding first operational amplifier to be made; and a comparator circuit for comparing an output voltage of each of the first operational amplifiers with the analog signal. The A/D converter can reduce a current output from the ladder-type resistor and speed up charge and discharge of the sampling capacitor.

REFERENCES:
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patent: 5798725 (1998-08-01), Okada
patent: 5877719 (1999-03-01), Matsui et al.
patent: 6181269 (2001-01-01), Nishiuchi et al.
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patent: 6583745 (2003-06-01), Sakakibara et al.
patent: 9-321627 (1997-12-01), None
patent: 2002-111461 (2002-04-01), None

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