Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Reexamination Certificate
2005-10-18
2005-10-18
Nguyen, John B. (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
C341S118000, C341S143000
Reexamination Certificate
active
06956516
ABSTRACT:
An A/D-conversion circuit is provided that includes: a counter, which outputs a count value CT; a voltage generation circuit, which generates a monotonically increasing or monotonically decreasing analog voltage AV1;a comparator, which compares the analog voltage AV1with an analog voltage AV2to which A/D conversion is conducted, and outputs an signal CQ according to the comparison result; a digital filter circuit, which conducts digital filtering processing to the signal CQ and outputs a signal DQ; and a count value hold circuit EFF, which holds the count value CT from the counter based on the signal DQ. The digital filter includes hold circuits FF1to FF3and changes the voltage level of the signal DQ, when a pattern of the output signals Q1to Q3thereof matches a predetermined pattern.
REFERENCES:
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patent: 5727023 (1998-03-01), Dent
patent: 5907299 (1999-05-01), Green et al.
patent: 6295413 (2001-09-01), Ogasawara
patent: 07-055857 (1995-03-01), None
Patent Abstracts of Japan regarding Publication No. 07-055857 published Mar. 3, 1995.
Harness & Dickey & Pierce P.L.C.
Nguyen John B.
Seiko Epson Corporation
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