VCDL-based dual loop DLL having infinite phase shift function

Details VCDL-based dual loop DLL having infinite phase shift function VCDL-based dual loop DLL having infinite phase shift function

2007-01-09

2007-01-09

Nguyen, Linh My (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C327S158000

Reexamination Certificate

active

11142698

ABSTRACT:
Provided is a dual loop DLL for generating an internal clock signal synchronized with an external clock, which includes a reference DLL receiving a reference clock and generating a plurality of phase clock signals having a first phase difference, a coarse loop selecting one of the phase clock signals and generating first through third digital codes to allow the internal clock signal to have a phase difference smaller than a second phase difference with respect to the external clock, and a fine loop selecting two of the phase clock signals and synchronizing the internal clock signal with the external clock, in response to the first through third digital codes.

REFERENCES:
patent: 6812760 (2004-11-01), Kim et al.
patent: 6868504 (2005-03-01), Lin

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