DLL circuit of semiconductor memory apparatus and method of...

Details DLL circuit of semiconductor memory apparatus and method of... DLL circuit of semiconductor memory apparatus and method of...

2006-12-22

2008-08-19

Lateef, Marvin M. (Department: 4146)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S007000, C327S012000, C327S161000

Reexamination Certificate

active

07414446

ABSTRACT:
A DLL circuit of a semiconductor memory apparatus includes a frequency sensing unit that generates and outputs a high frequency signal and a low frequency signal on the basis of a CAS latency signal. A clock dividing unit divides the frequency of an internal clock by a predetermined value and generates a divided clock in response with whether the high frequency signal is enabled or the low frequency signal is enabled. A phase sensing unit that switches a reference clock and a comparison clock, compares the phases thereof in accordance with whether the high frequency signal is enabled or the low frequency signal is enabled, selectively switches first and second phase control signals generated on the basis of the comparison result, and outputs the switched signals.

REFERENCES:
patent: 6867627 (2005-03-01), Murtagh
patent: 6928128 (2005-08-01), Sidiropoulos
patent: 6940325 (2005-09-01), Lee
patent: 6954094 (2005-10-01), Lee et al.
patent: 6980479 (2005-12-01), Park
patent: 7027336 (2006-04-01), Lee
patent: 7039147 (2006-05-01), Donnelly et al.
patent: 7158443 (2007-01-01), Lin
patent: 2004/0212406 (2004-10-01), Jung
patent: 2005 323323 (2005-11-01), None

Affiliated with

Also associated with

Rating

DLL circuit of semiconductor memory apparatus and method of... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with DLL circuit of semiconductor memory apparatus and method of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and DLL circuit of semiconductor memory apparatus and method of... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4012820