Fractional frequency synthesizer and phase locked loop...

Details Fractional frequency synthesizer and phase locked loop... Fractional frequency synthesizer and phase locked loop...

2006-08-18

2009-06-16

Kinkead, Arnold (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Plural a.f.s. for a single oscillator

C331S002000, C331S016000, C331S018000, C331S020000

Reexamination Certificate

active

07548121

ABSTRACT:
A fractional frequency synthesizer, applied to a phase-locked loop, includes a phase detector, a loop filter, a controllable oscillator, a first frequency divider, and a sigma-delta modulator (SDM). The phase detector generates a phase difference signal according to a reference signal and a feedback signal. The loop filter filters the phase difference signal to generate a filtered signal. The controllable oscillator generates the frequency signal according to the filtered signal. The first frequency divider generates the feedback signal by dividing a frequency of the frequency signal according to a dividing factor. The SDM determines the dividing factor according to a control signal.

REFERENCES:
patent: 6219397 (2001-04-01), Park
patent: 6686784 (2004-02-01), Chang
patent: 6823133 (2004-11-01), Adkins
patent: 6844836 (2005-01-01), Lee
patent: 6914464 (2005-07-01), Maeda
patent: 6961400 (2005-11-01), Huff et al.
patent: 7231010 (2007-06-01), Smith

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