Tuning a loop-filter of a PLL

Details Tuning a loop-filter of a PLL Tuning a loop-filter of a PLL

2005-10-25

2005-10-25

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S175000, C331S017000, C331S185000, C327S156000, C327S157000

Reexamination Certificate

active

06958657

ABSTRACT:
The invention relates to a method of automatically tuning a loop-filter of a phase locked loop. The loop-filter includes a capacitance at an output of a charge pump of the phase locked loop, and the charge pump provides current impulses to the loop-filter. In order to enable a simple tuning of the loop-filter, the method comprises adjusting the amplitude of the current impulses output by the charge pump essentially proportionally to the capacitance at the output of the charge pump. The invention relates equally to a phase locked loop comprising means for realizing this method and to a unit comprising such a phase locked loop.

REFERENCES:
patent: 5334951 (1994-08-01), Hogeboom
patent: 5668503 (1997-09-01), Gersbach et al.
patent: 6326852 (2001-12-01), Wakayama
patent: 6437615 (2002-08-01), Stascausky
patent: 03100979 (2003-12-01), None

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