Oscillators – Automatic frequency stabilization using a phase or frequency... – Afc with logic elements
Patent
1997-06-12
1998-10-13
Kinkead, Arnold
Oscillators
Automatic frequency stabilization using a phase or frequency...
Afc with logic elements
331 17, 331 11, 327156, 327159, 327160, 327105, 327106, 327107, 375376, H03L 718
Patent
active
058218165
ABSTRACT:
A variable frequency synthesis apparatus and method use a phase prediction signal to enable integer division in the feedback path of a phase-lock-loop to provide an output signal at a rational frequency multiple of an applied reference signal. A fixed integer divide ratio is maintained within each period of the reference signal. The output signal provided by a variable frequency oscillator is frequency divided and is phase compared to the reference signal. The phase comparison produces a predictable, time-varying phase difference signal based on a known frequency difference between the output signal and the reference signal. The phase prediction signal cancels the predictable phase difference signal and isolates an phase error signal used to steer, or adjust, the frequency of the oscillator to precisely equal the rational frequency multiple of the applied reference signal when the phase error signal is minimized.
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patent: 4179670 (1979-12-01), Kingsbury
patent: 4519091 (1985-05-01), Chu et al.
patent: 4536718 (1985-08-01), Underhill
patent: 5038117 (1991-08-01), Miller
Hewlett--Packard Company
Imperato John L.
Kinkead Arnold
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