A/D converter

Details A/D converter A/D converter

2006-04-11

2006-04-11

Nguyen, John B. (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S162000

Reexamination Certificate

active

07026972

ABSTRACT:
A voltage-to-time conversion circuit compares a ramp-wave voltage, which steps up at a certain gradient, with each of a reference voltage, an input voltage, and a reference voltage, and produces a PB pulsating signal representing the times which the voltages require for having a predetermined relationship to the ramp-wave voltage. An encoder circuit converts the times into coded data items according to the ratios of the times to a common unit time. A normalization circuit determines a conversion characteristic curve on the basis of the coded data items, into which the times required by the reference voltages are converted, and A/D-converted values predefined for the reference voltages, and fits the coded data, into which the time required by the input voltage is converted, to the characteristic curve. Thus, the A/D-converted value of the input voltage Vin is calculated.

REFERENCES:
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patent: 5477196 (1995-12-01), Yamauchi et al.
patent: 5517155 (1996-05-01), Yamauchi et al.
patent: 6362767 (2002-03-01), Yang et al.
patent: 6518900 (2003-02-01), Oehler et al.
patent: A-H10-4353 (1998-01-01), None

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