Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

2007-12-05

2009-12-08

Cox, Cassandra (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000

Reexamination Certificate

active

07629821

ABSTRACT:
A semiconductor memory device includes a phase comparator, a delay chain, a delay controller, a fine delay chain, a delay model, a locking state detector, and a fine delay controller. The phase comparator compares a phase of a reference clock with that of a feedback clock. The delay chain delays and outputs the reference clock. The delay controller controls a delay value of the delay chain in response to the comparison result of the phase comparator. The fine delay chain outputs a delay value of a clock outputted from the delay chain. The delay model delays a clock to a modeled delay value to provide a delayed clock as the feedback clock. The locking state detector generates a locking variation signal corresponding to a phase difference between the reference clock and the feedback clock. The fine delay controller controls a fine adjustment value of the fine delay chain.

REFERENCES:
patent: 6242954 (2001-06-01), Taniguchi et al.
patent: 6292016 (2001-09-01), Jefferson et al.
patent: 6518807 (2003-02-01), Cho
patent: 7099232 (2006-08-01), Kwak
patent: 7138845 (2006-11-01), Lin
patent: 7336752 (2008-02-01), Vlasenko et al.
patent: 10-2003-0048657 (2003-06-01), None
patent: 10-2005-0105558 (2005-11-01), None
patent: 10-2007-0036564 (2007-04-01), None
patent: 10-0810073 (2008-02-01), None
patent: WO 2005-083716 (2005-09-01), None
Notice of Allowance issued from Korean Intellectual Property Office on Aug. 13, 2008 with an English Translation.

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