Frequency synthesizer for CATV tuner

Details Frequency synthesizer for CATV tuner Frequency synthesizer for CATV tuner

1985-05-03

1986-09-23

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With intermittent comparison controls

331 17, 358114, H03L 706, H04K 102

Patent

active

046138269

ABSTRACT:
A variable frequency oscillator includes a RAM which stores a frequency setting data and provides a frequency control data, a VCO circuit which provides an oscillation output having a frequency which is defined by the contents of the frequency control data, a reference oscillator which provides a reference signal having a given frequency and phase, a phase comparator which detects the phase difference between the reference signal and a comparison signal corresponding to the oscillation output, and a logic circuit which combines the frequency control data with a phase data and provides the frequency setting data. The phase comparator provides the phase data whose contents indicate +1 if the phase of the comparison signal is delayed from the phase of the reference signal, indicate -1 if the phase of the comparison signal is advanced to the phase of the reference signal, and indicate 0 if the phase of the comparison signal matches with the phase of the reference signal.

REFERENCES:
patent: 4280140 (1981-07-01), Skerlos
patent: 4360832 (1982-11-01), Rzeszewski
patent: 4453136 (1984-06-01), Kelland

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