Circuit for controlling pulse width

Details Circuit for controlling pulse width Circuit for controlling pulse width

2006-04-18

2006-04-18

Le, Dinh T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S175000

Reexamination Certificate

active

07030671

ABSTRACT:
The present invention discloses a circuit for controlling a pulse width including a frequency detection circuit for extracting an operation frequency band by receiving an external clock, delaying the external clock for a different time and comparing a frequency of the external clock with frequencies of the external clocks delayed for the different time, respectively, and outputting a plurality of mode signals according to the operation frequency band; and a pulse generation circuit for generating a pulse having its width varied by the operation frequency, by using a delay time based on the plurality of mode signals from the frequency detection circuit. As a result, the circuit for controlling the pulse width can be applied to a next generation standard DRAM such as a high speed DDR2or DDR3as well as a high speed graphic DRAM for supporting various operation frequencies.

REFERENCES:
patent: 5646565 (1997-07-01), Tukidate
patent: 5740123 (1998-04-01), Uchida
patent: 6901528 (2005-05-01), Rangam
patent: 2000-0004529 (2000-01-01), None
Korean Office Action for Korean Patent Application No. 2003-88283 dated Aug. 31, 2005.

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