Analog-to-digital conversion apparatus and method

Details Analog-to-digital conversion apparatus and method Analog-to-digital conversion apparatus and method

2011-07-12

2011-07-12

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C326S030000, C333S003000

Reexamination Certificate

active

07978114

ABSTRACT:
The A/D conversion apparatus includes an A/D converter for converting a potential difference between a reference voltage input and a voltage input to be measured to a digital signal and outputting the digital signal; a first switch connected between a voltage source to be measured and the voltage input to be measured; a first sampling capacitor having a first end connected to the voltage input to be measured and to a first end of the first switch, and having a second end connected to a reference power source; a second switch connected between a reference voltage source and the reference voltage input; a second sampling capacitor having a first end connected to the reference voltage input and to a first end of the second switch, and having a second end connected to the reference power source; and an impedance adjusting circuit, which is connected between the reference voltage source and a second end of the second switch, for changing, in stepwise fashion, impedance between the reference voltage source and the second end of the second switch.

REFERENCES:
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patent: 6703908 (2004-03-01), Ruesch et al.
patent: 6815979 (2004-11-01), Ooshita
patent: 7437252 (2008-10-01), Sutardja
patent: 2004/0000926 (2004-01-01), Ooshita
patent: 10-293999 (1998-11-01), None
patent: 2004-040332 (2004-02-01), None

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