Duty cycle correction circuit of delay locked loop and delay...

Details Duty cycle correction circuit of delay locked loop and delay... Duty cycle correction circuit of delay locked loop and delay...

2006-10-10

2006-10-10

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S172000

Reexamination Certificate

active

07119594

ABSTRACT:
A duty cycle correction circuit and a delay locked loop (DLL) including the duty cycle correction circuit, are capable of controlling their operation in order to correctly analyze the cause of generation of a duty cycle error when the duty cycle error is generated in the DLL. The duty cycle correction circuit selectively outputs to a DLL core duty cycle offset information for controlling a duty cycle of an internal clock signal synchronized to an external clock signal under the control of a switching control signal. The DLL corrects the duty cycle of a reference clock signal according to the duty cycle offset information, thereby outputting a reference clock signal having a 50% duty cycle.

REFERENCES:
patent: 5945862 (1999-08-01), Donnelly et al.
patent: 6181178 (2001-01-01), Choi
patent: 6342801 (2002-01-01), Shin
patent: 6643790 (2003-11-01), Yu et al.
patent: 6735669 (2004-05-01), Shin
patent: 6853225 (2005-02-01), Lee

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