Oscillator tuning for phase-locked loop circuit

Details Oscillator tuning for phase-locked loop circuit Oscillator tuning for phase-locked loop circuit

2011-06-28

2011-06-28

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

C331S179000, C331S034000, C331S17700V

Reexamination Certificate

active

07969248

ABSTRACT:
In one example, a method of tuning an oscillator of a phase-locked loop (PLL) circuit includes adjusting a coarse control signal to select one of a plurality of frequency tuning curves of the oscillator. The method includes adjusting a fine control signal to select a position on the selected frequency tuning curve. A frequency of the oscillator is determined by the coarse control signal and the fine control signal. The method includes attempting to detect a lock between a feedback signal and a reference signal. A frequency of the feedback signal is determined by the frequency of the oscillator. The method includes comparing the fine control signal to a reference value if the lock is detected. The method includes adjusting the coarse control signal to select a different one of the frequency tuning curves if the selected position on the selected frequency tuning curve is outside a desired tuning range.

REFERENCES:
patent: 7382169 (2008-06-01), Nikolov et al.
patent: 7456672 (2008-11-01), Callahan et al.
patent: 7692497 (2010-04-01), Hao et al.
U.S. Appl. No. 11/924,088, Robert Bartel.
Wilson et al., A CMOS Self-Calibrating Frequency Synthesizer, IEEE Journal of Solid-State Circuits, IEEE Journal of Solid-State Circuits, vol. 35, No. 10, Oct. 2000, pp. 1437-1444.

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