Automatic calibration lock loop circuit and method having...

Details Automatic calibration lock loop circuit and method having... Automatic calibration lock loop circuit and method having...

2008-03-04

2010-02-23

Mis, David (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

C331S016000, C331S017000, C331S025000

Reexamination Certificate

active

07667545

ABSTRACT:
A lock loop circuit (216) includes a precharge circuit (304), an oscillator circuit (306), and a calibration circuit (309). The calibration circuit includes at least one register (362). The precharge circuit provides a precharge signal (347). The oscillator circuit provides an output frequency signal (228) in response to a steering signal (334) that is based on the precharge signal. The calibration circuit, prior to the lock loop circuit entering a disabled mode of operation, determines a calibration value (368) for the precharge circuit based on the precharge signal and the steering signal. The calibration circuit stores the calibration value as a digital calibration value (370) in the register.

REFERENCES:
patent: 5874863 (1999-02-01), Wojewoda et al.
patent: 5889829 (1999-03-01), Chiao et al.
patent: 6667642 (2003-12-01), Moyal
patent: 6731146 (2004-05-01), Gallardo
patent: 7199673 (2007-04-01), Erdogan
patent: 2005/0277397 (2005-12-01), Christoffers et al.

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