Circuit and method for detecting frequency of clock signal...

Details Circuit and method for detecting frequency of clock signal... Circuit and method for detecting frequency of clock signal...

2007-08-21

2007-08-21

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

C327S047000, C327S049000

Reexamination Certificate

active

11120804

ABSTRACT:
A frequency detection circuit and method of detecting the frequency of a clock signal, and a latency signal generation circuit for a semiconductor memory device that includes the frequency detection circuit. The frequency detection circuit includes a frequency detector and an output controller, which determines whether or not the frequency of the clock signal is higher than a predetermined value. Embodiments of the invention have an increased accuracy, increased efficiency, and a reduced current consumption over conventional art.

REFERENCES:
patent: 5926042 (1999-07-01), Talaga, Jr.
patent: 6055210 (2000-04-01), Setogawa
patent: 6911873 (2005-06-01), Yin et al.
patent: 7134042 (2006-11-01), Shimasaki
patent: 2003/0223293 (2003-12-01), Kawaguchi et al.
patent: 1998-022533 (1998-07-01), None
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patent: 2000-0038480 (2000-07-01), None
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patent: 2003-0037673 (2003-05-01), None
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English language abstract of Korea Publication No. 1998-022533.
English language abstract of Korea Publication No. 1999-0039594.
English language abstract of Korea Publication No. 2000-0038480.
English language abstract of Korean Publication No. 2001-0036041.
English language abstract of Korean Publication No. 2003-0037673.
English language abstract of Korean Publication No. 2003-0056461.

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