Power supply apparatus for delay locked loop and method thereof

Details Power supply apparatus for delay locked loop and method thereof Power supply apparatus for delay locked loop and method thereof

2007-04-03

2007-04-03

Callahan, Timothy P. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S143000, C327S539000

Reexamination Certificate

active

10877601

ABSTRACT:
A DLL voltage supply device for use in a semiconductor memory device includes: a bandgap voltage generating means for generating a bandgap voltage by using an external power supply voltage; a voltage level shifter for increasing a voltage level of the bandgap voltage in order to output an increased bandgap voltage as a DLL voltage; and a voltage level keep means for outputting the external power supply voltage as the DLL voltage if the increased bandgap voltage is lower than a predetermined voltage level.

REFERENCES:
patent: 5084665 (1992-01-01), Dixon et al.
patent: 5747978 (1998-05-01), Gariboldi et al.
patent: 6411544 (2002-06-01), Devin
patent: 6661213 (2003-12-01), Fayneh et al.
patent: 6815998 (2004-11-01), Samad

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