Injection locking using direct digital tuning

Details Injection locking using direct digital tuning Injection locking using direct digital tuning

2005-11-08

2005-11-08

Mis, David (Department: 2817)

Oscillators

Plural oscillators

Oscillator used to vary amplitude or frequency of another...

C331S055000, C331S1170FE, C331S158000, C331S172000, C331S17700V

Reexamination Certificate

active

06963249

ABSTRACT:
The invention relates to the field of electronics and more particularly to the tuning and injection locking of voltage controlled oscillators (VCOs). An improved injection locking circuit is provided which allows the VCO to injection lock with a smaller reference signal and therefore a smaller locking bandwidth (LBW). In order to allow the VCO to injection lock with a lower power reference signal, this invention includes a pre-tuning algorithm to place the VCO frequency such that the desired frequency is in the LBW. Tuning of the VCO is achieved using direct digital tuning that does not require an input reference. Injection locking is performed using a low frequency clock harmonic as the reference signal. More specifically, tuning is accomplished by sub-sampling and digitizing the output signal of the VCO, determining the center frequency, and adjusting the VCO control voltage.

REFERENCES:
patent: 5394117 (1995-02-01), Cohen
patent: 6121847 (2000-09-01), Katznelson et al.
patent: 2357491 (2003-03-01), None
patent: 0 395 860 (1990-11-01), None
patent: 1 011 198 (2000-06-01), None
patent: 1 213 840 (2002-06-01), None
patent: 1 229 655 (2002-08-01), None
C. Samorini et al “Phase Noise Degradation at High Oscillation Amplitudes in LC-Tuned VCO's” IEEE Journal of Solid-State Circuits; Jan., 2000; vol. 35, No. 1 pp 96-99.
Melville, R.; Long, D.et al, “An Injection Locking Scheme for Precision Quadrature Generation”, European Solid State Circuits Conference (ESSCIRC) Proceedings, 2001.
Ahmed, Hesham; DeVries,Chris; “A Digitally Tuned 1.1 GHz subharmonic Injection Locked VCO in 0.18 um CMOS”; Carleton University, Ottawa, Canada.
Philips Semiconductor; “An Overview of the phase-locked loop (PLL)”, pp 16, Dec. 1988.

Affiliated with

Also associated with

Rating

Injection locking using direct digital tuning does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Injection locking using direct digital tuning, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injection locking using direct digital tuning will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3508451