Frequency synthesizer operating according to the principle of fr

Details Frequency synthesizer operating according to the principle of fr Frequency synthesizer operating according to the principle of fr

1997-10-10

1998-12-08

Mis, David

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 18, 331 25, 327105, 327156, H03L 706, H03L 718

Patent

active

058476156

ABSTRACT:
A frequency synthesizer operating according to fractional frequency synthesis, has a phase-controlled oscillator, a phase detector that controls this oscillator, a loop filter arranged in a control line between the phase detector and the oscillator, a reference frequency source and a frequency divider arranged between this reference frequency source and one input of the phase detector, which frequency divider can be adjusted to whole-number division ratios. The frequency synthesizer also has an adjustment device that operates with multiple integration, by which the whole-number division ratio of the frequency divider is controlled such that a fractional division ratio corresponding to a desired fractional rational division ratio is simulated. The other input of the phase detector is connected with the output of the oscillator via a mixer, wherein a difference is formed of the output frequency of the oscillator and the reference frequency of the reference frequency source.

REFERENCES:
patent: 3976945 (1976-08-01), Cox
patent: 4234929 (1980-11-01), Riley, Jr.
patent: 4584539 (1986-04-01), Stankey
patent: 4609881 (1986-09-01), Wells
patent: 5146186 (1992-09-01), Vella

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