VCO initial frequency calibration circuit and method therefore

Details VCO initial frequency calibration circuit and method therefore VCO initial frequency calibration circuit and method therefore

2005-01-14

2010-06-22

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Synchronizers

Phase displacement, slip or jitter correction

C375S354000, C375S373000, C375S375000, C375S327000, C327S147000, C327S156000, C455S180300, C455S260000, C342S103000

Reexamination Certificate

active

07742553

ABSTRACT:
A device and a method for processing high data rate serial data includes a VCO initial frequency calibration circuit. The circuit includes a frequency detection block for indicating a difference between a reference clock and a divided VCO clock, a frequency calibration block that produces a digital output signal based upon the difference between the reference clock and the divided VCO clock, and a digital-to-analog converter for producing an analog VCO adjust signal. The frequency detection block produces a plurality of signals based upon the reference clock and the divided VCO clock. A plurality of user selected inputs selects a frequency detection lock range and hysteresis range and a coarse loop open calibration lock and hysteresis range. The frequency calibration block implements a state machine for producing the digital output signal that sets the initial operating frequency then adjusts the frequency of the VCO clock.

REFERENCES:
patent: 5257294 (1993-10-01), Pinto et al.
patent: 5521947 (1996-05-01), Madsen
patent: 5970106 (1999-10-01), Izumikawa
patent: 6215835 (2001-04-01), Kyles
patent: 6831491 (2004-12-01), Karlquist
patent: 6859509 (2005-02-01), Koudelka
patent: 7542533 (2009-06-01), Jasa et al.
patent: 2002/0075080 (2002-06-01), Nelson et al.
patent: 2003/0042985 (2003-03-01), Shibahara et al.
patent: 2004/0119514 (2004-06-01), Karlquist
patent: 2006/0145769 (2006-07-01), Vaananen et al.
patent: 2007/0009072 (2007-01-01), Jasa et al.

Affiliated with

Also associated with

Rating

VCO initial frequency calibration circuit and method therefore does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with VCO initial frequency calibration circuit and method therefore, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and VCO initial frequency calibration circuit and method therefore will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4210027