Phase-locked loop and control method utilizing the same

Details Phase-locked loop and control method utilizing the same Phase-locked loop and control method utilizing the same

2007-10-12

2009-11-03

Nguyen, Long (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

C331S018000, C375S376000

Reexamination Certificate

active

07612589

ABSTRACT:
A phase-locked loop includes a processing unit, a voltage-controlled oscillator, and a control unit. The processing unit generates a control voltage to a node according to a phase difference between a reference clock and a first feedback clock. The voltage-controlled oscillator generates the first feedback clock according to a voltage of the node. The control unit deactivates the voltage-controlled oscillator and provides a start voltage to the node in a power-down mode, and activates the voltage-controlled oscillator to generate the first feedback clock according to the voltage of the node in a power-on mode. The control unit stops providing the start voltage in the power-on mode.

REFERENCES:
patent: 5347232 (1994-09-01), Nishimichi
patent: 5537448 (1996-07-01), Schwarz et al.
patent: 5548249 (1996-08-01), Sumita et al.
patent: 5623234 (1997-04-01), Shaik et al.
patent: 7030669 (2006-04-01), Hulfachor et al.
patent: 2005/0097377 (2005-05-01), Chou

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