Frequency measuring circuits including charge pumps and...

Details Frequency measuring circuits including charge pumps and... Frequency measuring circuits including charge pumps and...

2007-05-15

2007-05-15

Barlow, Jr., John E. (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

Reexamination Certificate

active

11031104

ABSTRACT:
A frequency measuring circuit may include an edge detector, a charge pump, and an analog-to-digital (A/D) converter. The edge detector may be configured to generate an output pulse responsive to an edge of an input clock signal. The charge pump may be configured to generate an output signal responsive to the output pulse from the edge detector. The analog-to-digital (A/D) converter may be configured to convert the output signal into a digital value representing a frequency of the input clock signal. Related methods and integrated circuit memory devices are also discussed.

REFERENCES:
patent: 6114891 (2000-09-01), Kim
patent: 7050522 (2006-05-01), Schmatz
patent: 2004/0203479 (2004-10-01), Lin
patent: 2002-217698 (2002-08-01), None
patent: 1997-0051076 (1997-07-01), None
patent: 1999-0080383 (1999-11-01), None
patent: 2000-0003608 (2000-01-01), None
http://www.answers.com/topic/analog-to-digital-converter, p. 1-2.
“Understanding Flash ADCs”;A/D and D/A Conversion/Sampling Circuits; WWW.MAXIM-IC.COM/AN810 Application Note 810: Oct. 2, 2001 pp. 1-7.

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