Method and apparatus for stabilizing output frequency of PLL...

Details Method and apparatus for stabilizing output frequency of PLL... Method and apparatus for stabilizing output frequency of PLL...

2005-10-05

2009-10-20

Lee, Benny (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S017000, C327S157000, C327S536000, C375S374000

Reexamination Certificate

active

07605663

ABSTRACT:
A method and an apparatus for stabilizing output from a Phase Lock Loop (PLL) and the PLL thereof is disclosed. The method mainly relates to enabling the control voltage of a voltage control oscillator VCO in the PLL remained unchanged by means of turning off a charge-discharge current source of a charge pump in a PLL in response to a detected reference signal lower than a default value. Furthermore, the method enables the pulse frequency output from the VCO no exceeding a default tolerant frequency range in a distance from a desired output frequency. Thus, when the reference signal resumes the original frequency, the PLL can quickly lock the phase and the frequency again.

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