Semiconductor memory device and method for operating the same

Details Semiconductor memory device and method for operating the same Semiconductor memory device and method for operating the same

2011-04-05

2011-04-05

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S149000

Reexamination Certificate

active

07920001

ABSTRACT:
A semiconductor memory device has a DLL circuit capable of suppressing EMI without distorting a DLL clock required in high-speed operation. The semiconductor memory device includes a delay locked loop (DLL) circuit configured to be responsive to a system clock to output a DLL clock having a phase that is changed when electromagnetic interference (EMI) is detected, for the DLL clock to have frequencies within a delay locking range, and a data output circuit configured to output data in synchronization with the DLL clock.

REFERENCES:
patent: 7477716 (2009-01-01), Mai
patent: 7489568 (2009-02-01), Kim et al.
patent: 7688124 (2010-03-01), Choi
patent: 2009/0066379 (2009-03-01), Kim et al.
patent: 2009/0086876 (2009-04-01), Mai
patent: 2010/0090732 (2010-04-01), Lee et al.
patent: 2010/0214031 (2010-08-01), Yamamoto et al.

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