PLL lock management system

Details PLL lock management system PLL lock management system

2008-01-29

2008-01-29

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

C331S017000, C455S260000

Reexamination Certificate

active

07323944

ABSTRACT:
A PLL includes a charge pump, a loop filter, a VCO, and a calibration unit. The calibration unit performs coarse tuning to select one or multiple frequency ranges, performs fine tuning to determine an initial control voltage that puts the VCO near a desired operating frequency, measures the VCO gain at different control voltages, and derives VCO gain compensation values for the different control voltages. The calibration unit also pre-charges the loop filter to the initial control voltage to shorten acquisition time, enables the loop filter to drive the VCO to lock to the desired operating frequency, and performs VCO gain compensation during normal operation. For VCO gain compensation, the calibration unit measures the control voltage, obtains the VCO gain compensation value for the measured control voltage, and adjusts the gain of at least one circuit block (e.g., the charge pump) to account for variation in the VCO gain.

REFERENCES:
patent: 6680653 (2004-01-01), Griffith et al.
patent: 2003/0171105 (2003-09-01), Dunworth et al.
patent: 2003/0197564 (2003-10-01), Humphreys et al.
patent: 2004/0061559 (2004-04-01), Charlon

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