PLL frequency synthesizer employing plural control frequencies t

Details PLL frequency synthesizer employing plural control frequencies t PLL frequency synthesizer employing plural control frequencies t

1995-05-09

1997-08-26

Grimm, Siegfried H.

Oscillators

Automatic frequency stabilization using a phase or frequency...

Tuning compensation

331 25, H03L 718

Patent

active

056614403

ABSTRACT:
To switch a frequency of an output signal of a voltage controlled oscillator from a first frequency to a second frequency, a controller provides to a variable frequency divider such a frequency divisor that the voltage controlled oscillator produces a signal having a predetermined frequency ranging between the first and second frequencies. When the detected frequency of the signal output by the voltage controlled oscillator reaches a predetermined frequency, the controller changes the frequency divisor provided to the variable frequency divider to such a frequency divisor that the voltage controlled oscillator produces a signal having the second frequency.

REFERENCES:
patent: 4516083 (1985-05-01), Turney
patent: 4745371 (1988-05-01), Haine
Patent Abstracts of Japan, vol. 15, No. 494 (E-1145).

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