Startup/yank circuit for self-biased phase-locked loops

Details Startup/yank circuit for self-biased phase-locked loops Startup/yank circuit for self-biased phase-locked loops

2005-07-26

2005-07-26

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

C327S156000, C331S014000, C331S017000

Reexamination Certificate

active

06922047

ABSTRACT:
An apparatus for controlling a phase-locked loop includes a detector for detecting at least one of a startup condition and a yank condition and a controller for controlling current between a charge pump and the phase-locked loop. If a startup condition is detected, the controller sinks current from a control node connected to a loop filter of the phase-locked loop. This, in turn, causes a bias voltage to increase until the phase-locked loop transitions from startup mode to a normal acquisition mode. The current sink is provided by a dummy charge pump and the startup condition is determined by detecting the end of a PLL disable state. If a yank condition is detected, a charge pump connected to a phase-frequency detector of the phase-locked loop controls the bias voltage until a feedback frequency becomes lower than a reference frequency. Methods for controlling a phase-locked loop during both modes of operation may use of the aforementioned apparatus.

REFERENCES:
patent: 5304955 (1994-04-01), Atriss et al.
patent: 5512860 (1996-04-01), Huscroft et al.
patent: 6078634 (2000-06-01), Bosshart
patent: 6147561 (2000-11-01), Rhee et al.
patent: 6329882 (2001-12-01), Fayneh et al.
patent: 6476681 (2002-11-01), Kirkpatrick
patent: 6693494 (2004-02-01), Fan
patent: 6762649 (2004-07-01), Miller
patent: 2003/0227332 (2003-12-01), Lee et al.

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