Clock signal generator

Details Clock signal generator Clock signal generator

1998-07-30

2000-06-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327244, 327254, 327255, H03L 700

Patent

active

060782005

ABSTRACT:
A clock signal generator includes a phase shifter for generating four clock signals having phases consecutively shifted from one another by 90 degrees based on an external clock signal, a mixer for mixing two of the four clock signals to output an internal clock signal, and an initializing circuit for selecting consecutively one and another of the four clock signals as an internal clock signal in an initializing period. A phase comparator compares the internal clock signal against the external clock signal in the initializing period to determine which of the internal clock signal and the external clock signal leads. The initializing circuit reduces the time length for locking of the internal clock signal to the external clock signal in an operational period of the mixer.

REFERENCES:
patent: 4642573 (1987-02-01), Noda et al.
patent: 5614855 (1997-03-01), Lee et al.
patent: 5732109 (1998-03-01), Takahashi
NEC Technical Journal, vol. 47, No. 3, Mar. 25, 1994, 11 pgs.

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