Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2007-10-02
2007-10-02
Nguyen, Khai M. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S154000, C341S156000, C341S158000, C341S159000
Reexamination Certificate
active
11369753
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.
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Saito Yasuyuki
Yada Naoki
Miles & Stockbridge P.C.
Nguyen Khai M.
Rensas Technology Corp.
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