Self-tunable phase lock loop

Details Self-tunable phase lock loop Self-tunable phase lock loop

2006-12-12

2006-12-12

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C331S025000, C455S260000

Reexamination Certificate

active

07148754

ABSTRACT:
The present invention provides a method and an apparatus for selectively pretuning and updating a phase lock loop, deployed in an integrated circuit including an agile radio, such as a wideband or an ultra wideband frequency agile radio in a telecommunication system, for example, a reconfigurable multiband and/or multistandard mobile communication system. In one embodiment, a phase lock loop may comprise a digital storage having a first desired frequency. An oscillator may provide an oscillator frequency and a frequency generator circuit capable of producing at least one control signal may cause the oscillator to adapt the oscillator frequency based on the first desired frequency in response to a trigger signal. A pretune unit may apply a pretune voltage to a tuning element to cause the oscillator to calibrate the oscillator frequency to the first desired frequency. An output voltage may be added at the output of a loop filter to the pretune voltage to tune the output voltage of the loop filter such that to set the oscillator frequency substantially at the first desired frequency. An update unit may automatically determine whether one or more parameters of a phase lock loop unit have changed to dynamically update the pretune voltage.

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“A Low Cost High Stability Microcontroller Compensated Crystal Oscillator” by N. Scott Demo, et al - 1998.
“Patent Abstract of Japanese Publication No. 020022721”, Fukukawa Shinichi, Aug. 1, 1990.

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