Integrated circuit devices having duty cycle correction...

Details Integrated circuit devices having duty cycle correction... Integrated circuit devices having duty cycle correction...

2006-03-21

2006-03-21

Nguyen, Minh (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S296000

Reexamination Certificate

active

07015739

ABSTRACT:
Digital duty cycle correction circuits are provided including a duty cycle detector circuit configured to generate first and second control values associated with a first internal clock signal and a second internal clock signal, respectively. A comparator circuit is also provided and is configured to compare the first control value to the second control value and provide a comparison result. A counter circuit is configured to perform an addition and/or a subtraction operation responsive to the comparison result to provide a digital code. A digital to analog converter is configured to generate third and fourth control values responsive to the digital code. Finally, a duty cycle corrector circuit is configured to receive first and second external clock signals and the first through fourth control values and generate the first and second internal clock signals having a corrected duty cycle. The first and second control values are received over a first path and the third and fourth control values are received over a second path, different from the first path. Related methods of operating duty cycle correction circuits are also provided.

REFERENCES:
patent: 5155397 (1992-10-01), Fassino et al.
patent: 5572158 (1996-11-01), Lee et al.
patent: 6373309 (2002-04-01), Bang
patent: 6525581 (2003-02-01), Choi
patent: 6566925 (2003-05-01), Ma
patent: 6583657 (2003-06-01), Eckhardt et al.
patent: 2002-44191 (2002-06-01), None
Korean Intellectual Office, “Notice to File a Response/Amendment to the Examination Report” Corresponding to Korean Patent aplication 10-2003-0019653, mailed May 30, 2005.

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