Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Synchronizing
Reexamination Certificate
2006-06-06
2006-06-06
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Synchronizing
C327S175000
Reexamination Certificate
active
07057431
ABSTRACT:
A digital DLL apparatus and a method for correcting a duty cycle are disclosed. The apparatus includes: a delay line unit for receiving external clock signal and generating first and second delayed internal clock signals by delaying the external clock signal; a duty error controller for receiving the first and second delayed clock signals and outputting a first duty controlled clock signal and second duty controlled clock signal by shifting edges of the first and second delayed internal clock signals; and a delay model unit for compensating a delay of the duty controlled clock signal by estimating a delay amount of system. The present invention can correct the duty error by using the phase mixer and generate an internal clock signal having 50% of duty cycle.
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Callahan Timothy P.
Hynix / Semiconductor Inc.
Marshall & Gerstein & Borun LLP
Nguyen Hai L.
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